Chlorine Recycle Process for Titanium-Bearing Feedstocks with High Iron Contents for the Production of Titanium Tetrachloride Based on the Conversion of Anhydrous Ferrous Chloride to Ferrous Sulfate with concentrated Sulfuric Acid
The invention relates to a method for recycling chlorine in the production of titanium tetrachloride. Further, the invention refers to the use of this method in the chloride process to produce titanium dioxide.
The invention relates to a method for recycling chlorine in the production of titanium tetrachloride. Further, the invention refers to the use of this method in the chloride process to produce titanium dioxide.
A reactor has a double-wall inlet tube for supplying a gas that contains a chlorination agent and also providing a protective gas shrouding at the end of the inlet tube. The reactor includes a reactor vessel with a protective lining on the inside wall. The double-walled inlet tube extends into the reactor vessel through the protective lining. The double-walled chlorine inlet tube has an inner pipe, an outer pipe, and a peripheral space between the inner and outer pipes. The chlorination agent containing gas is injected into the reactor vessel through the inner pipe, and the protective gas is injected simultaneously into the reactor vessel through the outer pipe in the peripheral space between the inner pipe and the outer pipe to form a protective gas shroud around the end of the double-wall inlet tube. The protective gas may be recycled from other portions of the process to reuse various materials produced from carbochlorination process.
B01J 19/02 - Apparatus characterised by being constructed of material selected for its chemically-resistant properties
B01J 8/18 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles
B01J 4/00 - Feed devicesFeed or outlet control devices
B01J 19/14 - Production of inert gas mixturesUse of inert gases in general
A jet mill has a milling chamber, a product injection nozzle configured to inject particles to be ground into the milling chamber, a primary exhaust port configured to exhaust ground particles from inside the milling chamber, a grinding nozzle configured to inject milling gas into the milling chamber, and a recirculation outlet port may be configured to collect partially ground particles from inside the milling chamber. A conduit operatively couples the recirculation outlet port to the grinding nozzle such that partially ground particles from inside the milling chamber can be recirculated through the recirculation outlet port and the conduit to the grinding nozzle and from the grinding nozzle back into the grinding chamber in a stream of mixed particles and milling gas.
The present invention relates to a method for coating inorganic particles in an aqueous suspen- sion with at least one coating substance, comprising the steps of a) heating the aqueous suspen- sion of inorganic particles to a temperature in the range of from 30 to 95°C; b) adding a first water- soluble precursor of a coating substance to the aqueous suspension and curing the aqueous suspension in a temperature range of from 30 to 95°C at a pH in the range of from 3 to 10.5; d) wherein the temperature of the aqueous suspension during the overall coating process is set in the range of from 30 to 95°C and the pH of the aqueous suspension during the overall coating process is in the range of from 3.0 to 10.5; e) wherein the aqueous suspension passes during coating step b) at least one agitator wherein the at least one agitator provides an energy input of 1.6 kWh/m3 or less and has a rotational speed of 5900 rpm or less; and f) wherein the aqueous suspension is circulated at least during step b) by the at least one agitator in a circuit, wherein the circuit contains the at least one agitator and at least one vessel.
A spiral jet mill for grinding granular product, such as TiO2 particles, includes multiple, such as at least two product injector nozzles for mixing and injecting a corresponding number of streams of steam or other pressurized gas and the granular product into the grinding chamber. In use, the ratio of total pressurized gas, such as the sum of all input steam and grinding steam injected into the grinding chamber, to granular product, such as TiO2 pigment particles, is preferably less than the corresponding ratio used in conventional processes so as to realize energy savings relative to the amount of steam or other pressurized gas that is used per unit of granular product that is milled.
The invention relates to a feedstock composite comprising a metal oxide fraction and a carbonaceous fraction, a binder composition and the use thereof for obtaining the feedstock composite. Further, the invention refers to a method for obtaining the feedstock composite.
The invention relates to a feedstock composite comprising a metal oxide fraction and a carbonaceous fraction, a binder composition and the use thereof for obtaining the feedstock composite. Further, the invention refers to a method for obtaining the feedstock composite.
The invention relates to a method for recovering chlorine from hydrogen chloride generated in carbochlorination processes. Further, the invention refers to the use of this method for recovering chlorine from hydrogen chloride generated in a carbochlorination process.
The invention relates to a method for recovering chlorine from hydrogen chloride generated in carbochlorination processes. Further, the invention refers to the use of this method forrecovering chlorine from hydrogen chloride generated in a carbochlorination process.
The present invention relates to a grinding aid as well as a grinding method. Further, the present invention pertains to a titanium dioxide particle with a layer comprising a grinding aid as described herein and the use of said titanium dioxide particle in various applications.
B24D 3/34 - Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special natureAbrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
C09C 3/04 - Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
The invention relates to a method for treating a residue obtained from the chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.
The invention relates to a method for treating a residue obtained from the chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.
The invention relates to a pigment particle possessing at least one security feature, a method for obtaining the same, and a suspension comprised of the pigment particle. In addition, the invention refers to a method for marking a product with a pigment particle according to the invention and the use of a pigment particle for marking and verifying said pigment particle.
The invention relates to a color-neutral rutile pigment particle, a method for obtaining said pigment particle, and a composition comprised of said rutile pigment particle. Finally, the invention refers to the use of the rutile pigment particle in various applications.
The invention relates to a colored pigment particle, a method for obtaining said colored pigment particle, and a composition comprised of said particle. In addition, the invention refers to the use of said colored pigment particle.
The invention relates to a colored pigment particle, a method for obtaining said colored pigment particle, and a composition comprised of said particle. In addition, the invention refers to the use of said colored pigment particle.
The invention relates to a color-neutral rutile pigment particle, a method for obtaining said pigment particle, and a composition comprised of said rutile pigment particle. Finally, the invention refers to the use of the rutile pigment particle in various applications.
The invention relates to a composite material comprised of titanium dioxide pigment particles and nanocellulose wherein the titanium dioxide pigment particles and the nanocellulose are covalently bonded to each other via at least one carboxyl groups and/or at least one phosphate groups. In addition, the present invention pertains to a method for obtaining said composite material, the composite material obtained by said method. Finally, the present invention relates to an aqueous slurry and the use of the aqueous slurry in the manufacture of paper, décor papers, corrugated cardboards, and packaging.
D21H 17/69 - Water-insoluble compounds, e.g. fillers or pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
The invention relates to a composite material comprised of an undried, coated titanium dioxide pigment particle and nanocellulose. In addition, the present invention pertains to a method for obtaining said composite material, and to the composite material obtained by said method. Finally, the present invention relates to an aqueous slurry and the use of the aqueous slurry in the manufacture of paper, décor papers, corrugated cardboards, and packaging.
D21H 11/20 - Chemically or biochemically modified fibres
D21H 17/67 - Water-insoluble compounds, e.g. fillers or pigments
D21H 17/69 - Water-insoluble compounds, e.g. fillers or pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
D21H 17/00 - Non-fibrous material added to the pulp, characterised by its constitutionPaper-impregnating material characterised by its constitution
D21H 27/26 - Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
25.
STABLE TI-OXIDE AND FE-OXIDE PIGMENT SLURRIES COMPRISING PH-STABILIZING LITHIUM IONS
The present invention relates to water-based pigment slurry obtainable by dissolving and/or dispersing the following components in water: (A) a Ti-oxide and/or Fe-oxide pigment,(B) a pH-stabilizing composition comprising a water soluble or water dispersible source of lithium ions,(C) a dispersant composition comprising a dispersant selected from the group of phosphoric acid derivatives and/or phosphonic acid derivatives,to the use of a such a slurry for the preparation of a coating formulation, to a coating formulation comprising such a slurry and to a substrate which has a surface coated with such a coating formulation.
CHLORINE RECYCLE PROCESS FOR TITANIUM-BEARING FEEDSTOCKS WITH HIGH IRON CONTENTS FOR THE PRODUCTION OF TITANIUM TETRACHLORIDE BASED ON THE CONVERSION OF ANHYDROUS FERROUS CHLORIDE TO FERROUS SULFATE WITH CONCENTRATED SULFURIC ACID
The invention relates to a method for recycling chlorine in the production of titanium tetrachloride. Further, the invention refers to the use of this method in the chloride process to produce titanium dioxide.
The invention is related to a method for the production of titanium-containing feedstock for the chloride process using titanium-containing material. Further, the invention refers to the use of this method to produce a titanium-containing feedstock for the chloride process with a titanium content of at least 90 wt.%
The present invention relates to a grinding aid as well as a grinding method. Further, the present invention pertains to a titanium dioxide particle with a layer comprising a grinding aid as described herein and the use of said titanium dioxide particle in various applications.
An aqueous printing ink comprised of undried, coated titanium dioxide pigment particles obtainable by a method comprising the steps of (i) providing an aqueous suspension of titanium dioxide base pigments, and (ii) forming at least one coat on said titanium dioxide base pigments as well as to an aqueous slurry containing the pigment particles. In addition, the present invention pertains to a method for obtaining said aqueous printing ink, a method for printing the aqueous printing ink onto the surface of a substrate, and a printing ink container as well as an inkjet printer comprising said ink. Finally, the present invention relates to the use of the aqueous printing ink to print a printing image onto the surface of a substrate.
The invention relates to an aqueous printing ink comprised of undried, coated titanium dioxide pigment particles obtainable by a method comprising the steps of (i) providing an aqueous suspension of titanium dioxide base pigments, and (ii) forming at least one coat on said titanium dioxide base pigments as well as to an aqueous slurry containing the pigment particles. In addition, the present invention pertains to a method for obtaining said aqueous printing ink, a method for printing the aqueous printing ink onto the surface of a substrate, and a printing ink container as well as an inkjet printer comprising said ink. Finally, the present invention relates to the use of the aqueous printing ink to print a printing image onto the surface of a substrate.
The invention relates to an titanium dioxide particle with high opacity and UV-greying resistance comprising two silica coats and at least one alumina coat, to a method for the obtaining the same, and to the use of said particle in a method for obtaining a decorative paper laminate or a decor foil. The present invention further pertains a decorative paper laminate or a decor foil containing said coated titanium dioxide particle.
C08K 9/02 - Ingredients treated with inorganic substances
D21H 27/18 - Paper-based or board-based structures for surface covering
D21H 27/20 - Flexible structures being applied by the user, e.g. wallpaper
D21H 27/26 - Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
D21H 17/67 - Water-insoluble compounds, e.g. fillers or pigments
D21H 17/68 - Water-insoluble compounds, e.g. fillers or pigments siliceous, e.g. clays
D21H 17/00 - Non-fibrous material added to the pulp, characterised by its constitutionPaper-impregnating material characterised by its constitution
D21H 19/38 - Coatings with pigments characterised by the pigments
D21H 19/40 - Coatings with pigments characterised by the pigments siliceous, e.g. clays
Paints, varnishes, lacquers, preservatives against rust and against deterioration of wood, colorants, dyes, inks for printing, inks for marking, inks for engraving, raw natural resins, metals in foil and metals in powder form for use in painting, decorating, printing and art.
01 - Chemical and biological materials for industrial, scientific and agricultural use
02 - Paints, varnishes, lacquers
Goods & Services
Chemicals, namely semi finished products based on titandioxide pigments and extenders for the use as architectal paints and paints for cardboard coatings. Paints, varnishes, lacquers, colorants, architectal paints, paints for cardboard coatings, dyes, inks for printing, inks for marking, inks for engraving.
Paints, varnishes, lacquers, preservatives against rust and against deterioration of wood, colorants, dyes, inks for printing, inks for marking, inks for engraving, raw natural resins, metals in foil and metals in powder form for use in painting, decorating, printing and art.
Paints, varnishes, lacquers, preservatives against rust and against deterioration of wood, colorants, dyes, inks for printing, inks for marking, inks for engraving, raw natural resins, metals in foil and metals in powder form for use in painting, decorating, printing and art.
The invention relates to a method for obtaining nanoparticulate titanium dioxide in agglomerate form from a hydrolyzed acidic titanyl compound, the thus obtained titanium dioxide as well as the use thereof as a photocatalyst, process catalyst or adsorbent, especially in aqueous systems.
C01G 23/053 - Producing by wet processes, e.g. hydrolysing titanium salts
B01D 53/00 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
B01J 21/00 - Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
The invention relates to a method for obtaining nanoparticulate titanium dioxide in agglomerate form from a hydrolyzed acidic titanyl compound, the thus obtained titanium dioxide as well as the use thereof as a photocatalyst, process catalyst or adsorbent, especially in aqueous systems.
C01G 23/053 - Producing by wet processes, e.g. hydrolysing titanium salts
B01J 20/06 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group
B01J 37/00 - Processes, in general, for preparing catalystsProcesses, in general, for activation of catalysts
B01J 20/28 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof characterised by their form or physical properties
B01J 20/30 - Processes for preparing, regenerating or reactivating
B01J 21/06 - Silicon, titanium, zirconium or hafniumOxides or hydroxides thereof
B01J 35/00 - Catalysts, in general, characterised by their form or physical properties
B01J 35/10 - Solids characterised by their surface properties or porosity
B01D 53/02 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by adsorption, e.g. preparative gas chromatography
C02F 1/28 - Treatment of water, waste water, or sewage by sorption
The invention relates to a pigment composition for preparing pigmented matt coatings, such as matt paints and printing inks. Further, the invention relates to a process for preparing such pigment composition, and to a coating formulation containing such composition. Finally, the invention is directed to a pigmented matt surface of a substrate, and to the use of the pigment compositions disclosed herein for matting substrates.
The invention relates to a process for producing a titanium dioxide pigment obtainable by the sulfate process with a narrow particle size distribution, the pigment itself, and the use of said pigments in coatings and printing inks.
The invention relates to a process for producing a titanium dioxide pigment obtainable by the sulfate process with a narrow particle size distribution, the pigment itself, and the use of said pigments in coatings and printing inks.
The invention relates to a method for coating the surface of a substrate, such as inorganic particles, with a metal oxide, wherein a reduced mass-related specific surface area of the metal oxide coating is achieved. In particular, the invention relates to the surface coating of titanium dioxide pigment particles with aluminum oxide.
A method for coating the surface of a substrate, such as inorganic particles, with a metal oxide. A suspension is formed containing the substrate, a polyvalent anion and a metal ion where the molar ratio of the polyvalent anion to the metal ion is greater than three and the metal ion is precipitated onto the substrate as a metal oxide. Preferably, the method is used to coat titanium dioxide pigment particles with aluminum oxide.
B01J 2/00 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic
The invention is related to a method and vibratory apparatus for the improved solid-liquid filtration of filter cakes, especially for dewatering finely divided thixotropic filter cakes, with the aid of a vibratory apparatus. Further, the invention relates to a filtration apparatus having a vibratory apparatus as described herein, and to the use of the vibratory apparatus for the solid-liquid filtration of filter cakes.
B01D 33/76 - Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
B01D 25/34 - Removal of filter cakes by moving the filter elements
B01D 33/62 - Handling the filter cake in the filter for purposes other than for regenerating for drying
B01D 29/80 - Handling the filter cake in the filter for purposes other than for regenerating for drying
B01D 33/073 - Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
B01D 33/46 - Regenerating the filter material in the filter by scrapers, brushes or the like acting on the cake-side of the filtering element
61.
METHOD AND DEVICE FOR IMPROVED SOLID-LIQUID FILTRATION OF FILTER CAKES
The invention relates to a method and a device for improved solid-liquid filtration of filter cakes, in particular for dewatering fine-particle, thixotropic filter cakes, with the aid of an oscillating device. The oscillating device according to the invention is formed of at least one oscillation drive, a connection part, and an oscillating body, wherein the connection part is connected on one side to at least one oscillation drive and on the other side to at least one oscillating body, wherein the connection part is decoupled from the housing of the filtration apparatus, and wherein the at least one oscillating body contacts the filter cake or protrudes into same. The method is characterized in that only one part of the filter cake is caused to oscillate. The oscillating device can be subsequently attached to available filtration apparatuses with little expense. The method is suited, for example, for use in producing titanium dioxide or paper, and in wastewater treatment.
The invention relates to a matting agent comprising agglomerates of pigment particles, to a method for the preparation of such matting agents, and to coating formulations containing the matting agents disclosed herein. The present invention further relates to pigmented mat surfaces, and to the use of agglomerates of pigment particles for matting pigmented coatings.
The invention is directed to matting agents comprising agglomerates of pigment particles, a method for manufacturing matting agents of said kind, and coating formulations containing the matting agents disclosed herein. The invention further relates to pigmented matte surfaces and the use of agglomerates of pigment particles for matting pigmented coatings.
The invention relates to a method of separating metal chlorides of value, especially titanium tetrachloride and niobium pentachloride, from solid residues obtained in the chlorination of iron/titanium-containing raw materials in the course of titanium dioxide production (chloride method), and is based on the principle of evaporation/sublimation and the resublimation of the metal chlorides. The solid residues are first heated and the adhering metal chlorides of value are evaporated/sublimed. It is possible here to adjust the temperature and pressure or partial pressure so as to accomplish substantially selective evaporation of the metal chlorides of value. Subsequently, the evaporated/sublimed metal chlorides are transported with a dry and chemically inert carrier gas to a cooling apparatus and deposited by resublimation on the cooled surfaces. The deposition can preferably likewise be effected in a selective manner and in that case is guided, for example, by the vapour pressure curves of the pure substances.
The invention relates to the method step of reducing trivalent iron in the production of titanium dioxide according to the sulfate method. According to the invention, after the removal of the poorly soluble decomposition residue, the reduction occurs by means of metallic iron in such a way that the trivalent iron is completely reduced to divalent iron and tetravalent titanium is partially reduced to trivalent titanium in a deliberate manner. A Ti(III) content of 1 wt% to 5 wt% with respect to the total titanium is preferably sought. The method step according to the invention preferably occurs in continuous operation at a temperature of ᡶ 50°C to ឬ 85°C in a reduction reactor, wherein the progress of the reduction is monitored by means of the redox potential or the iron(III) content or titanium(III) content of the solution. The method according to the invention is characterized by the following advantages: said method can be largely automated, the reduction reaction proceeds steadily, different scrap qualities can be used, and improved TiO2 product quality is achieved.
The invention relates to the production of composite pigments containing aluminium hydroxide, and the use thereof to improve the pigment light-scattering efficiency in coatings, plastics, paper and laminate. The composite pigment particles contain pigment particles, in particular titanium dioxide, and precipitated aluminium hydroxide. In an embodiment of the invention, the composite pigment additionally contains at least one further inorganic and/or at least one organic filler as an extender, preferably selected from the group dolomite, huntite, magnesite and hydromagnesite. The composite pigment particles according to the invention are produced by in-situ precipitation of aluminium hydroxide in an aqueous pigment particle suspension. The use of the titanium dioxide-based composite pigment particles according to the invention enables pigment savings without or with only minor losses to visual properties, depending on the selected combination. Alternatively, better values can also be achieved with the same pigment content. In particular, a part or the entire titanium dioxide share in the user system can be replaced by the composite pigment particles according to the invention.
The invention is directed to a process for the further processing of iron sulphate heptahydrate to iron sulphate monohydrate. The process comprises the steps: a) forming an aqueous solution or suspension of iron sulphate heptahydrate in a container (mixture I), b) conveying mixture I into a first pressurized vessel and heating mixture I to a temperature T1, which is above the boiling temperature of mixture I at atmospheric pressure, where a pressure P1 is formed and where iron sulphate monohydrate forms as solid and a solution II, c) separating off the iron sulphate monohydrate solid from solution II, d) conveying the separated-off iron sulphate monohydrate solid with adhering solution II into a further pressurized vessel with a pressure P3, where P3 is lower than the pressure which prevails in step c), and where the temperature of the incoming solid with adhering solution II is above the boiling temperature of solution II at the pressure P3 and where a temperature T3 corresponding to the pressure P3 is formed in the further pressurized vessel. Optionally the iron remaining in the solution II is furthermore recovered by reacting solution II in an oxidation reactor with air or oxygen and optionally additives, and iron oxide and/or iron hydroxide being formed in solid form.
The invention relates to a method for the further processing of iron sulfate heptahydrate into iron sulfate monohydrate. An aqueous solution or suspension of iron sulfate heptahydrate is formed and heated in a pressure vessel to a temperature above its boiling temperature at atmospheric pressure and where solid iron sulfate monohydrate and a solution are formed. The solid iron sulfate monohydrate is separated from the solution and fed into a pressure vessel at a temperature above the boiling temperature of the solution at the pressure in the pressure vessel, which is lower than the pressure during separation.
The invention relates to a method for surface coating of inorganic particles in aqueous phase, in particular of titanium oxide pigment particles with a dense silicon dioxide shell and at least one additional inorganic compound, in particular with aluminum oxide, wherein the coating extensively consists of separate layers. The method is characterized in that, following application of the silicon dioxide layer, the particles are separated from the suspension, washed, and heat-treated and then pasted into an aqueous suspension again and coated with at least one additional inorganic compound. The heat treatment preferably occurs at temperatures from 400°C to 800°C. Titanium dioxide pigment particles treated with SiO2 and Al2O3 according to the invention are characterized by improved tint reducing power, reduced acid solubility, and an isoelectric point shifted to higher pH values.
3 according to the invention, are characterized by improved tinting strength, reduced acid solubility and an isoelectric point shifted towards higher pH values.
B05D 3/04 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
B05D 7/00 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
The invention relates to a process for preparing a photocatalyst based on carbon- or metal-containing titanium dioxide in a pulsation reactor by introducing a raw materials mixture of nanoparticulate titanium oxyhydrate and an aqueous solution or suspension which comprises at least one organic, carbon-containing compound or metal ions into the pulsating flow of hot gas in the pulsation reactor, with formation of the carbon- or metal-containing titanium dioxide particles. After material has been supplied, the flow of hot gas has a temperature of ≥450°C and contains oxygen in excess. Unlike the known preparation processes where the raw materials mixture is heat-treated in customary heating assemblies such as rotary kilns, fluid-bed reactors or heated ploughshare mixers, the process of the invention features the possibility of achieving reproducibly high product quality levels.
The invention relates to a process for recovering hydrochloric acid from concentrated metal chloride solutions (concentration ≥ 20% by weight) having an iron chloride content of more than 50% by weight calculated as Fe, where the Fe3+/Fe2+ ratio is at least 0.2. The process of the invention comprises the steps of: a) spray granulation of the metal chloride solution at temperatures of 150°C to 300°C, preferably 150°C to 250°C, wherein at least a portion of the iron chloride is converted to iron oxide by hydrolysis and a granulated material and HCl-containing gas are formed, b) pyrohydrolysis of the granulated material formed in process step a) in a reactor at temperatures exceeding 550°C, preferably exceeding 800°C, forming HCl-containing gas, c) recovery of hydrochloric acid from the HCl-containing gases formed in process steps a) and/or b). It is a feature of the process of the invention that solutions having a high FeCl3 content are processible and that a majority of the evaporation of water takes place at low temperatures and hence high throughputs are achieved in a plant.
The invention relates to a method for producing stable agglomerates of fine-particle raw materials for the production of titanium dioxide in a device for a compression agglomeration, for example a roller press. The starting material has a particle size d50 of 10 to 200 pm, a specific surface area according to BET of 2 m2/g to 20 m2/g, and a moisture of less than 15 wt.%. No binders are used, and an intermediate drying process is not necessary. Synthetic rutile produced according to the benelite process is particularly suitable as the starting material. The agglomerates are then preferably sintered. The sintering process is carried out preferably at a temperature of over 900 °C and leads to a sintered product with a bulk density of at least 1.6 g/cm3.
The invention relates to a method for producing composite particles, in particular composite particles based on titanium dioxide and carbonate, by means of combined mixing, homogenization, and precipitation in a flow-through mixer based on the rotor-stator principle. The method proceeds from an aqueous suspension of a particulate main component (e.g., titanium dioxide), which preferably is produced in a reservoir vessel equipped with a high-power stirring unit. At least one of the required precursor substances and/or a pH-controlling component for precipitating, for example, calcium carbonate, is metered into the flow-through mixer and precipitates the calcium carbonate. The method can be performed as a fully continuous method or as a batch method and enables shorter production times. The produced composite particles have a homogenous dispersion of the precipitated particles and of the particulate main component.
The invention relates to a method for the surface coating of particulate inorganic solids, more particularly of titanium dioxide pigment particles in an aqueous suspension. The untreated particles, especially TiO2 bodies, are made into an aqueous suspension and then deagglomerated. The deagglomerated aqueous particle suspension (2) is conveyed according to the invention from a reservoir vessel (vessel) (1) in a circulating operation (3) (pumped in circulation). Located in the reservoir vessel is a high-power agitator (4). The high-power agitator has a minimum peripheral speed of 15 m/s or a specific stirring power P/V of at least 30 W/m3. Installed in the circuit (3) also is a flow-traversed mixer (e.g. in-line disperser) (5) based on the rotor-stator principle. The water-soluble precursor compounds of the coating substances (6) and the pH control substances (7), if required, are metered into the flow-traversed mixer. Compared to its prior-art counterparts, the method of the invention, applied to titanium dioxide particles, leads to smoother surface coatings (lower BET specific surface area) with improved density (low sulphuric acid solubility). Moreover, less coating material is separately precipitated (improved gloss).
The invention relates to composite pigment particles containing calcium phosphate, their manufacture and their use in coatings, plastics and laminates. The composite pigment particles contain titanium dioxide pigment particles and precipitated calcium phosphate. In one embodiment, the composite pigment particles additionally contain an inorganic and/or organic filler as an extender, preferably selected from the group comprising Ca, Ca—Mg and Mg carbonates, natural and synthetic silicon dioxide and oxides. The composite pigment particles are manufactured in a combined process of dispersion and precipitation. Depending upon the combination selected, use of composite titanium dioxide pigment particles of the invention can provide improved optical properties such as tinting strength or permits pigment savings with little to no loss of optical properties. In particular, the composite pigment particles of the invention can be used to replace part or all of the titanium dioxide contained in the user's system.
2 base material, are made into an aqueous suspension and subsequently disagglomerated. According to the invention, a disagglomerated suspension of untreated particles is fed (recirculated) from an intermediate vessel (vessel) in a cyclic process. The intermediate vessel contains a high-speed agitator preferably having a minimum peripheral speed of 15 m/s or a specific agitator capacity P/V of at least 30 W/m3. A pipeline mixer (e.g. inline disperser) based on the rotor/stator principle is furthermore installed in the circuit. The water-soluble precursor compounds of the coating substances, and equally any necessary pH-controlling substances, are metered into the pipeline mixer. This leads to surface coatings with greater smoothness (low specific surface area according to BET), improved density (low sulphuric-acid solubility), and less coating substance precipitated separately (improved gloss).
The invention relates to composite pigment particles containing calcium phosphate, to the production thereof and to the use thereof in coatings, plastics and laminates. The composite pigment particles contain titanium dioxide pigment particles and precipitated calcium phosphate. In one embodiment, the composite pigment particles additionally contain an inorganic and/or organic filler as an extender, preferably selected from the group of Ca, Ca-Mg and Mg-carbonate, natural and synthetic silicon dioxide and oxides. The composite pigment particles are produced in a combined process of dispersion and precipitation. The use of the titanium oxide-based composite pigment particles according to the invention enables pigment savings without or with only minor losses to visual properties, depending on the selected combination. Alternatively, better values can also be achieved with the same pigment content, such as in tinting strength. In particular, a part or the entire titanium dioxide share in the user system can be replaced by the composite pigment particles according to the invention.
The invention relates to a method for the surface treatment of inorganic pigment particles with agglomerates of fine primary particles or single crystals of inorganic compounds, particularly of oxides or sulphates. The method is characterized in that the inorganic compounds are first precipitated from an aqueous solution under suitable pH conditions in a separate vessel in the form of fluffily structured agglomerates and/or single crystals. The precipitation product is subsequently added to an aqueous suspension of inorganic pigment particles. The method is particularly suitable for the surface treatment of titanium dioxide particles, in order to achieve high hiding power or high opacity when used in emulsion paints or laminates.
D21H 27/28 - Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures treated to obtain specific resistance properties, e.g. against wear or weather
The invention relates to rutile titanium dioxide pigment particles which are capable of reflecting infrared radiation to a high degree and of exhibiting pigmenting properties, and also to a method for producing them. The particles have an average size of 0.4 to 1.0 μm and are doped with zinc and potassium, but not with aluminium. The particles have a stocky shape with a preferred side ratio of 1.5:1. The particles are produced preferably by the known sulphate process for producing titanium dioxide, and after having been calcined are optionally given an organic and/or inorganic aftertreatment. The rutile titanium dioxide particles of the invention are suitable for producing heat insulation paints, varnishes or plastics and also, for example, for producing renders or paving stones.
The invention relates to a method for the surface treatment of inorganic pigment particles with agglomerates of fine-particle primary particles or individual crystals of inorganic compounds, particularly of oxides or sulphates. The method is characterized in that initially the inorganic compounds are precipitated in the form of loosely structured agglomerates and/or individual crystals from an aqueous solution under suitable pH conditions in a separate container. The precipitate is then added to an aqueous suspension of inorganic pigment particles. The method is particularly suited to the surface treatment of titanium oxide pigments for achieving a high covering power and/or a high opacity when used in emulsion paints or in laminates.
The invention relates to the production of pigment-containing composite pigment particles and to the use thereof in order to improve the pigment light-scattering efficiency in coatings, plastics, and laminate. The composite pigment particles contain titanium dioxide pigment particles, at least one inorganic and/or organic filler as an extender, and calcium carbonate which is precipitated in the process. The filler is preferably selected from the group consisting of Ca, Ca-Mg, and Mg carbonates, natural and synthetic silicon dioxide, and oxides. The composite particles are produced in a combined process consisting of precipitation and dispersion. The use of the composite pigment particles according to the invention, said particles consisting of fillers and titanium dioxide pigment, allows the use of less pigment without or with only a low loss of optical properties depending on the selected combination. Alternatively, even greater values can be achieved, with respect to tinting strength for example, when the same pigment content is used. In particular, a part or all of the TiO2 content in the user system can be replaced with the composite pigment particles according to the invention.
The invention relates to a construction material mixture as a concrete additive. The construction material mixture contains a pozzolanic substrate and a photocatalyst. The pozzolanic substrate and the photocatalyst are present as a dry mixture. The dry mixture is a cement-free dry mixture, wherein the photocatalyst has a primary particle size between 2 nm and 100 nm, and at least 90% by weight of the pozzolanic substrate consists of fly ash with a grain size between 0.1 μm and 1 mm. The substrate and the photocatalyst are intensively mixed such that the photocatalyst is at least partly distributed on the surface of the substrate. The construction material mixture improves the processing of a concrete in comparison to the use of other pozzolanic substrates for the catalyst.
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
90.
STABLE NANOPARTICULAR SUSPENSION AND METHOD FOR PRODUCING SAME
The invention relates to a stable highly concentrated (up to 70% by weight) aqueous suspension of nanoparticles, in particular of titanium dioxide particles, to a method for producing same and to the use of the suspension for example as a coating or impregnant or as an additive in organic or inorganic matrices. The suspension contains a first dispersant based on a polymer alkoxylate and a second dispersant from the group of amino alcohols. The suspension is characterized in that the stability is maintained even during or after intensive dispersion in a stirrer mill, and no increase in viscosity occurs. In a particular embodiment, the viscosity decreases by up to 10 to 50% as a function of the grinding duration. In a further embodiment, the suspension can be dried and then re-dispersed, wherein the same state of dispersion as in the original suspension is achieved.
The invention relates to a stable, highly concentrated, aqueous suspension of nanoparticles, particularly of titanium dioxide particles, a method for production, and use of the suspension, e.g. for coating or impregnation, or as an additive in organic or inorganic matrices. The suspension contains a first dispersant based on a polymeric alkoxylate and a second dispersant selected from the group of amino alcohols. The suspension is preferably characterized by the fact that its stability is preserved even during and after vigorous dispersion in an attrition mill and no increase in viscosity occurs. In a preferred embodiment, the viscosity declines by up to 10 to 50% as a function of the milling time. In a further embodiment, the suspension can be dried and subsequently redispersed, without the state of dispersion deteriorating.
The invention relates to a method for modifying the surface of titanium dioxide pigment and to the use thereof particularly in coating materials, for interior and exterior walls (emulsion paints) and in water-based coating systems. The pigment of the invention allows the rheological behaviour and open time of the paint to be optimized. The method of surface modification starts from a titanium dioxide pigment which has been provided with a loosely structured surface coating, and subsequently exposes the pigment particles to high shearing and impact forces, thereby at least partly compacting the loose structure of the surface coating. The pigment particles are coated preferably with silicon oxide and/or aluminium oxide. The method of the invention reduces the specific surface area (BET) by around 30%.
The invention relates to a process for producing an iron-containing photocatalyst based on titanium dioxide. The photocatalyst is produced by introducing iron(III) ions into an aqueous suspension of titanium oxide hydrate nanoparticles, subsequently precipitating iron(III) hydrate, separating off the mixture of titanium oxide hydrate and iron(III) hydrate and heat treating it at a temperature of at least 100°C: the photocatalyst produced by the process of the invention is photoactive both in the UV region and in the visible spectral region.
2 suspension with a pH value of at least 8, in which context the pH value drops to 3 or below. An alkaline aluminum compound is subsequently added, in which context the pH rises to at least 5, after which an acid aluminum compound is added, as a result of which a pH value of 4.5 to 7 is obtained. The pigment manufactured by the method according to the invention is eminently suitable for use in decorative laminating paper.
The invention relates to a method for the surface treatment of a titanium dioxide with aluminium phosphate and aqueous aluminium oxide, which results in pigments having improved greying stability and at the same time good brightness and opacity. The method is characterised in that, first of all, phosphoric acid is added to a TiO2 suspension having a pH of at least 8, whereupon the pH drops to 3 or below. Subsequently an alkaline aluminium compound is added and the pH increases to at least 5 and thereafter an acid aluminium compound is added, the pH adjusting to 4.5 to 7. The pigment produced according to the method of the invention is excellently suitable for use in decorative paper.
The invention relates to inorganic particles which are coated with at least one inorganic or organic bismuth compound that is catalytically effective for polymerizing polymers. The inorganic bismuth compound is selected from the group consisting of bismuth oxychloride, bismuth hydroxosulfate, and bismuth carbonate, and the organic bismuth compound is selected from the group consisting of bismuth acetate, bismuth benzoate, bismuth citrate, bismuth lactate, and bismuth phthalate. The particles are readily dispersible in polymer systems, in particular in aqueous coating substances which contain solvents and which are based on isocyanates, epoxides, or urea derivatives. Titanium dioxide is used in particular as the particles. The particles which are coated with bismuth are produced in an aqueous solution by adding a bismuth source and a bismuth-compatible water-soluble compound and subsequently precipitating the bismuth compound onto the particle surface.
C08G 59/68 - Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups characterised by the catalysts used
C09D 5/44 - Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects producedFilling pastes for electrophoretic applications
01 - Chemical and biological materials for industrial, scientific and agricultural use
02 - Paints, varnishes, lacquers
17 - Rubber and plastic; packing and insulating materials
Goods & Services
Chemicals used in industry, namely photocatalysts for enhancing the self-cleaning effect and for destroying hazardous materials on surfaces of cement, concrete, plaster, paint, roof tiles, paving stones, wood, metal, ceramic, glass, fibres, organic materials. Paints; Colour compositions with active surfaces provided with photocatalysts for enhancing the self-cleaning effect and for destroying hazardous materials which come into contact with the surface. Goods of plastic; Products of plastic with active surfaces provided with photocatalysts for enhancing the self-cleaning effect and for destroying hazardous materials which come into contact with the surface.
01 - Chemical and biological materials for industrial, scientific and agricultural use
02 - Paints, varnishes, lacquers
17 - Rubber and plastic; packing and insulating materials
Goods & Services
Chemicals used in industry, namely photocatalysts for enhancing the self-cleaning effect and for destroying hazardous materials on surfaces of cement, concrete, plaster, paint, roof tiles, paving stones, wood, metal, ceramic, glass, fibres, organic materials. Paints; Colour compositions with active surfaces provided with photocatalysts for enhancing the self-cleaning effect and for destroying hazardous materials which come into contact with the surface. Goods of plastic; Products of plastic with active surfaces provided with photocatalysts for enhancing the self-cleaning effect and for destroying hazardous materials which come into contact with the surface.
100.
DISPERSION THAT CAN BE PRECIPITATED PHOTOCATALYTICALLY
The invention relates to a method for photocatalytically precipitating a dispersed material from a tenside dispersion. The tenside dispersion comprises at least one dispersing agent, a dispersed material, a tenside, and a photocatalyst. Titanium dioxide is in particular suitable as a photocatalyst that is photoactive in the ultraviolet range and optionally also in the visible spectral range. The dispersing agent is preferably water or an aqueous fluid. Perfluoridated tensides (PFT), among others, are also suitable as a tenside. The method is characterized in that in particular temperature-sensitive materials, such as polytetrafluorethylene (PTFE) can be precipitated in a simple manner.
B01D 21/01 - Separation of suspended solid particles from liquids by sedimentation using flocculating agents
C02F 1/32 - Treatment of water, waste water, or sewage by irradiation with ultraviolet light
C02F 1/72 - Treatment of water, waste water, or sewage by oxidation
B05D 3/06 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
