25P125AAP3A255, relative to the total weight of the acid (P4); (Step 6) adding at least part of the acid (P4) obtained in step 5 to step 2 so as to contribute to providing the acid (P2) in step 2.
The invention relates to a method for producing phosphoric acid, a monovalent cation sulfate and calcium carbonate, comprising a first treatment of a phosphate source with an inorganic acid solution, a second treatment for obtaining calcium sulfate, recovery of phosphoric acid and calcium sulfate to be treated in a treatment with a monovalent cation carbonate solution, and recovery of calcium carbonate and a monovalent cation sulfate.
C05B 11/10 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using orthophosphoric acid
25255 comprised between 0.5 and 5.0, thereby forming at least one first slurry comprising a first liquid phase and a first solid phase adding at least one alkaline additive to said first slurry, thereby forming a second slurry and separating said second solid phase from said second liquid phase.
The invention relates to a nanofibre composition comprising mesoporous hydroxyapatite particles distributed in an array formed by the nanofibres, wherein the nanofibres are selected from the group consisting of polymer nanofibres, ceramic nanofibres, metal nanofibres, carbon nanofibres and mixtures thereof, and wherein the proportion of the weight content of nanofibres relative to the weight content of hydroxyapatite particles is between 0.5 and 2. The invention also relates to the filtering material comprising this composition and to the method for producing the filtering material.
B01D 39/18 - Other self-supporting filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
B01D 29/00 - Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups Filtering elements therefor
B01D 39/16 - Other self-supporting filtering material of organic material, e.g. synthetic fibres
B01D 39/20 - Other self-supporting filtering material of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires
6.
PROCESS FOR PRODUCING CRYSTALLINE AMMONIUM ORTHOPHOSPHATE
A process for producing a crystalline ammonium orthophosphate composition, comprising at least the steps of contacting at least one phosphoric acid composition and at least one ammoniacal source in at least one first vessel thereby forming at least one mixture wherein said mixture has a N/P molar ratio comprised between 1.35 and 1.55. After, the mixture is transferred from said first vessel to a second vessel wherein said N/P molar ratio of said liquid mixture is adjusted to either at least 1.70 and at most 2.30 or to at least 0.70 and at most 1.30, thereby forming at least one first slurry comprising a solid residue comprising AP and a liquid phase. After, said solid residue is separated from said liquid phase and dried, thereby obtaining an AP composition.
The invention relates to a process comprising the following steps: - contacting a material with acidic ions (H+) in the presence of water, - Separating the formed first liquid phase, - Neutralisation resulting into the formation of a second liquid phase mainly comprising water and ions, and a second solid phase comprising magnesium, - Separating said second liquid phase from said second solid phase, - Recycling at least a part of said second liquid phase within the process.
polypolypolypoly/Fe molar ratio of the composition is between 4.00 to 50.00. The invention pertains further to an aqueous solution obtained by dissolving said solid nutrient composition, to a method for providing bioavailable iron to plants, to the use of said solid nutrient composition in a fertilizing composition and to the use in a foliar application of an aqueous solution according to the present invention.
344; contacting with at least one alkaline composition comprising at least one potassic compound with said one solution (A), thereby forming one composition (C); contacting one material able to reduce said chlorate with either the solution (A), or said one alkaline composition, or said composition (C) drying step of said composition (C), thereby forming a DKP composition; said DKP composition comprising, at least 90.0 wt.% of DKP.
The present invention concerns a dipotassium hydrogen phosphate composition and the process of preparation thereof. Said DKP composition comprising based on the total weight of said DKP composition at least 50.00 wt.% of DKP; said DKP composition having: a D10 of at least 10 µm, and a D50 of at least 50 µm and of at most 200 µm, said D10 and D50 being measured by laser granulometry in methanol after 3 minutes of ultrasonic sonication. The DKP composition has good flowability.
C01B 25/22 - Preparation by reacting phosphate containing material with an acid, e.g. wet process
C01B 25/32 - Phosphates of magnesium, calcium, strontium, or barium
C05B 3/00 - Fertilisers based essentially on di-calcium phosphate
C05B 11/04 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
13.
"METHOD FOR PURIFYING A PHOSPHATE CONTAINING SOLUTION"
The present invention concerns a method for purifying a phosphate containing solution using at least a first ion-exchange separation system and a second ion-exchange separation system, each IEX system comprising at least two columns connected in series; each column of said first IEX system comprising at least one strong acid cation resin, and each column of said second IEX system comprising at least one chelating resin.
B01J 39/05 - Processes using organic exchangers in the strongly acidic form
B01J 39/20 - Macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
B01J 45/00 - Ion-exchange in which a complex or a chelate is formedUse of material as complex or chelate forming ion-exchangersTreatment of material for improving the complex or chelate forming ion-exchange properties
B01J 47/026 - Column or bed processes using columns or beds of different ion exchange materials in series
B01J 49/06 - Regeneration or reactivation of ion-exchangersApparatus therefor of fixed beds containing cationic exchangers
The present invention concerns a process for preparing a liquid phosphate composition; said process comprising at least the steps of providing in at least one vessel: at least one phosphate source, and either at least one MCl salt selected from the group consisting of alkali chlorides, ammonium chloride and mixtures thereof and at least one FSA source, or at least one composition (A) obtained by contacting at least one MCl salt with at least one FSA source; contacting said phosphate source with either said MCl salt and said FSA source, or with said composition (A), thereby forming at least one slurry comprising at least one solid residue and a liquid phosphate composition; separating said solid residue from said liquid phosphate composition.
2533; adding barium carbonate to said vessel, said barium carbonate having a specific particle size distribution which allows for effective flow of the barium carbonate while allowing it to have good reactivity.
25244) and a mineral acids (HX), in a ratio (H+(SA) / H+(L) comprised between 2 and 75%, wherein H+(SA) and H+(L) are the mole content of H+issued from the sulphuric acid and the digestion liquor (L), respectively, - is added to the raw material (PC1) to form a digested suspension (PC2) in amounts such that the molar ratio H+(L) / Ca is comprised between 0.8 and 1.95, wherein Ca is the mole content of calcium present in the digested suspension (PC2), and - separating the digested suspension (PC2) into, on the one hand, the aqueous phosphate rich solution (P1) and, on the other hand, the first solid phase (C1).
The present invention concerns a process and an apparatus for purifying a phosphate containing acidic solution comprising impurities through a nanofiltration station comprising a number of nanofiltration membrane units, each comprising a retentate side and a permeate side separated by a membrane, the process comprising feeding the phosphate containing acidic solution through an entry line to a first membrane unit of n 2: 1 membrane units arranged in series, wherein a nthpermeate flowing out of the nth membrane unit forms a nanofiltered phosphate solution. The gist of the present invention is the provision of at least one permeate recirculation loop, branching off the retentate side of the first membrane unit and closing the loop at the entry line to combine at least one of three permeates with the phosphate containing acidic solution.
255 concentration thereof and thus to form an enriched phosphoric acid solution. A portion of the enriched phosphoric acid solution is conveyed with a flow rate of Qp into the combustion chamber in order to be pulverised in the flame. The rest of the enriched phosphoric acid solution is conveyed into a recirculation loop in order to be reinjected into the gas-acid contactor with a flow rate of Q2. The ratio of Qp / (Qp + Q2) is controlled with a predefined value.
B01J 8/02 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with stationary particles, e.g. in fixed beds
C08G 79/04 - Phosphorus linked to oxygen or to oxygen and carbon
B01J 19/30 - Loose or shaped packing elements, e.g. Raschig rings or Berl saddles, for pouring into the apparatus for mass or heat transfer
21.
METHOD FOR RECYCLING RESIDUAL SOLUTIONS COMPRISING PHOSPHORUS AND DEVICE FOR SUCH A METHOD
255 and thus to form the solution of enriched phosphoric acid. A portion of this solution is conveyed at a flow rate Qp into the combustion chamber. The remainder of the solution is conveyed into a recycle loop in order to be reintroduced into the gas/acid contactor at a flow rate Q2. The ratio of the flow rates, Qp / (Qp + Q2) is controlled at a predefined value.
B01J 8/02 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with stationary particles, e.g. in fixed beds
C08G 79/04 - Phosphorus linked to oxygen or to oxygen and carbon
B01J 19/30 - Loose or shaped packing elements, e.g. Raschig rings or Berl saddles, for pouring into the apparatus for mass or heat transfer
22.
METHOD FOR PRODUCING A CERAMIC MATERIAL FOR THERMAL ENERGY STORAGE
ASSOCIATION POUR LA RECHERCHE DEVELOPPEMENT DES METHODES ET PROCESSUS INDUSTRIELS - A.R.M.I.N.E.S. (France)
Inventor
Boulif, Rachid
Dhiba, Driss
Semlal, Nawal
Germeau, Alain
Toussaint, Claudia
Nzihou, Ange
Pham Minh, Doan
Sane, Abdoul Razac
Abstract
The invention relates to a method for producing a ceramic material for thermal energy storage, characterised in that it comprises the production of a mixture of at least particles of clay and particles of natural and/or synthetic phosphate, and water, said mixture comprising between 0.5 and 40 mass % of phosphate in relation to the mass of the mixture, excluding the water, as well as the shaping and the firing of the mixture in order to produce the ceramic material. The invention also relates to a ceramic material for thermal energy storage, characterised in that it comprises a matrix of clay, and where appropriate, sand, and particles of a natural phosphate and/or a synthetic phosphate which are dispersed in said matrix, said ceramic material comprising between 0.5 and 40 mass % of phosphate in relation to the mass of the ceramic material. The invention also relates to a method for thermal energy storage in said ceramic material, characterised in that it comprises bringing a heat-transfer fluid into contact with said ceramic material, in such a way as to transfer heat from the heat-transfer fluid to the ceramic material in a charging phase and to transfer heat from the ceramic material to the heat-transfer fluid in a discharging phase.
C04B 35/447 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on phosphates
C09K 5/00 - Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerantsMaterials for the production of heat or cold by chemical reactions other than by combustion
The present invention relates to a method for producing calcium monohydrogen phosphate, involving corroding, in an aqueous medium for a predetermined period of time, a source of phosphate using an acid, with a pulp being formed comprising an aqueous phase that contains calcium phosphate in a solution and a solid phase that contains impurities, a first separation of said aqueous phase and said solid phase for a predetermined period of time, neutralisation of said aqueous phase at a pH sufficient for achieving precipitation of said calcium monohydrogen phosphate, and a second separation of said aqueous medium and said calcium monohydrogen phosphate, characterised in that said first separation in step b) takes place at a filtration rate of at least 0.1 tonnes of P2O5/√ΔP/m2/day.
C01B 25/32 - Phosphates of magnesium, calcium, strontium, or barium
C01B 25/22 - Preparation by reacting phosphate containing material with an acid, e.g. wet process
C05B 7/00 - Fertilisers based essentially on alkali or ammonium orthophosphates
C05B 11/12 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using aqueous hydrochloric acid
A23L 33/16 - Inorganic salts, minerals or trace elements
25.
METHOD FOR PRODUCING CALCIUM MONOHYDROGEN PHOSPHATE
The present invention relates to a method for producing calcium monohydrogen phosphate, involving corroding, in an aqueous medium for a predetermined period of time, a source of phosphate using an acid, with a pulp being formed comprising an aqueous phase that contains calcium phosphate in a solution and a solid phase that contains impurities, a first separation of said aqueous phase and said solid phase for a predetermined period of time, neutralisation of said aqueous phase at a pH sufficient for achieving precipitation of said calcium monohydrogen phosphate, and a second separation of said aqueous medium and said calcium monohydrogen phosphate, characterised in that the predetermined period of time in digestion step a) is greater than that in step b) above.
C01B 25/22 - Preparation by reacting phosphate containing material with an acid, e.g. wet process
C01B 25/32 - Phosphates of magnesium, calcium, strontium, or barium
C05B 7/00 - Fertilisers based essentially on alkali or ammonium orthophosphates
C05B 11/12 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using aqueous hydrochloric acid
A23L 33/16 - Inorganic salts, minerals or trace elements
A method for preparing calcium sulfate comprising the production of DCP (dicalcium phosphate) by attacking a phosphate source with an acid, the digestion of the isolated DCP by sulfuric acid under conditions resulting in the formation of a first slurry of gypsum in suspension in an acid aqueous phase having a free SO3 content of less than or equal to 1.5% and a free P2O5 content, the conversion of at least a portion of said first slurry by heating to a temperature greater than 80°C and optionally adding sulfuric acid, with the solubilisation of the gypsum crystals and recrystallisation of the solubilised calcium sulfate into a second slurry of calcium sulfate hemihydrate crystals of type a in suspension in a phosphoric acid aqueous phase, in which the free SO3 content is less than 10% by weight, and the separation of this aqueous phase and a filter cake made from particularly pure, type a, calcium sulfate hemihydrate.
A method for preparing calcium sulfate comprising the production of DCP (dicalcium phosphate) by attacking a phosphate source with an acid, the digestion of the isolated DCP by sulfuric acid under conditions resulting in the formation of a first slurry of gypsum in suspension in an acid aqueous phase having a free SO3 content of less than or equal to 1.5% and a free P2O5 content, the conversion of at least a portion of said first slurry by heating to a temperature greater than 80°C and optionally adding sulfuric acid, with the solubilisation of the gypsum crystals and recrystallisation of the solubilised calcium sulfate into a second slurry of calcium sulfate hemihydrate crystals of type a in suspension in a phosphoric acid aqueous phase, in which the free SO3 content is less than 10% by weight, and the separation of this aqueous phase and a filter cake made from particularly pure, type a, calcium sulfate hemihydrate.
A process for fertigation of plants, which comprises forming a series of stock solutions, feeding each of the stock solutions into a diluting system, so as to form a fertigation solution, feeding a fertigation device by means of a transfer device, feeding said fertigation device with said fertigation solution, and adding iron and at least one polyphosphate.
The invention relates to a method for the deposition of thin films, comprising preparing a solution containing at least one transition metal oxide powder in a solvent, continuously stirring said solution in order to form a sol, and using said sol in the form of said transition metal oxide film, characterised in that the powder is subjected to a preliminary preparation step.
The invention relates to a method for the production of thin films, comprising: preparing a solution containing transition metal oxide precursors, a chelating agent and a polar organic solvent; maintaining the solution under agitation in order to form a sol; and using the sol in the form of the transition metal oxide film. The method is characterised in that the chelating agent is selected from among di- or tri-aliphatic carboxylic acids, or salts or mixtures thereof, and in that the polar organic solvent has a boiling temperature at atmospheric pressure of less than 150°C.
The invention relates to a method for the production of thin films, comprising: preparing a solution containing transition metal oxide precursors, a chelating agent and a polar organic solvent; maintaining the solution under agitation in order to form a sol; and using the sol in the form of the transition metal oxide film. The method is characterised in that the chelating agent is selected from among di- or tri-aliphatic carboxylic acids, or salts or mixtures thereof, and in that the polar organic solvent has a boiling temperature at atmospheric pressure of less than 150°C.
A method and device for producing polyphosphoric acid burns a fuel in combustion air in a combustion chamber, sprays a spray fluid comprising substantially pure orthophosphoric acid and undertakes polymerization-condensation of the pure orthophosphoric acid. A polyphosphoric acid in the form of an acid mist accompanied by formation of gases which mix with combustion gases resulting from burning of the fuel is formed to reach a predetermined temperature, wherein the mixture causes sudden lowering of combustion gas temperature. The acid mix is separated from the gas mixture and the polyphosphoric acid is collected at a bottom of the combustion chamber and the gas mixture is outputted via a lower part of the combustion chamber separate from the collection of polyphosphoric acid.
C08G 79/04 - Phosphorus linked to oxygen or to oxygen and carbon
B01J 19/24 - Stationary reactors without moving elements inside
B01J 10/00 - Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particlesApparatus specially adapted therefor
B01J 19/26 - Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
B01J 8/02 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with stationary particles, e.g. in fixed beds
C01B 25/228 - Preparation by reacting phosphate containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form
C01B 25/222 - Preparation by reacting phosphate containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
The present invention relates to an inorganic liquid nutritive composition comprising at least one aqueous phase, a polyphosphate and at least one source of iron as micronutrient, having a Ppoly/Fetotal molar ratio of between 5 and 50.
The present invention relates to an inorganic solid nutritive composition comprising at least one polyphosphate and at least one source of iron as micronutrient, wherein said composition is water-soluble and comprises an iron content of between 0.1% and 5% by weight of iron relative to the total weight of said solid composition.
A process for manufacturing a composite material comprising a functionalization of the substrate, which comprises treatment of said substrate with at least one first alcoholic solvent, functionalization of a first powder and formation of a first colloidal sol of said functionalized first powder in a second solvent, at least one application of a layer of said first colloidal sol of said first powder to the substrate, drying of said layer of said first colloidal sol and formation of a layer of first coating formed by said first colloidal sol, adherent to said substrate, by heating at a temperature above 50°C and below 500°C.
C23C 18/04 - Pretreatment of the material to be coated
C23C 18/12 - Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coatingContact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
B82Y 30/00 - Nanotechnology for materials or surface science, e.g. nanocomposites
B01J 13/00 - Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided forMaking microcapsules or microballoons
C23C 24/00 - Coating starting from inorganic powder
37.
FORMULATION OF TRANSPARENT AND NUTRITIVE MICROEMULSIONS
A clear and nutritive microemulsion comprising an aqueous phase in which at least one liposoluble active ingredient is dispersed, a first surfactant included in the group consisting of non-ionic surfactants with a high HLB and non-ionic surfactants with medium HLBs; and a second surfactant, characterized in that said second surfactant is chosen from the group consisting of anionic surfactants which have an HLB ≥ 25.
C01B 25/228 - Preparation by reacting phosphate containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form
39.
DIHYDRATE-HEMIHYDRATE PROCESS FOR PRODUCING PHOSPHORIC ACID
The invention relates to a process for producing phosphoric acid, including etching, in an aqueous medium, phosphate rock using sulfuric acid, resulting in the formation of a first dihydrate slurry, in suspension in an aqueous phase, having a free P2O5 content of between 38 and 50% and a free SO3 content lower than 0.5%, converting said first slurry by means of heating, resulting in the recrystallization of the solubilized calcium sulfate so as to obtain a second hemihydrate slurry, and separating the second slurry into industrial phosphoric acid and a hemihydrate cake, characterized in that said process includes, during the etching, adding a fluorine source into the first slurry with a content of 1 to 5 wt % of F relative to the P2O5 contained in the phosphate rock.
A method and device for producing polyphosphoric acid burns a fuel in combustion air in a combustion chamber, sprays a spray fluid comprising substantially pure orthophosphoric acid and undertakes polymerization-condensation of the pure orthophosphoric acid. A polyphosphoric acid in the form of an acid mist accompanied by formation of gases which mix with combustion gases resulting from burning of the fuel is formed to reach a predetermined temperature, wherein the mixture causes sudden lowering of combustion gas temperature. The acid mix is separated from the gas mixture and the polyphosphoric acid is collected at a bottom of the combustion chamber and the gas mixture is outputted via a lower part of the combustion chamber separate from the collection of polyphosphoric acid.
B01J 19/26 - Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
B01J 8/02 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with stationary particles, e.g. in fixed beds
The present invention relates to stable solid compositions comprising a first carrier and an adsorbate comprising at least one active component such as a vitamin D derivative and a hydrophobic stabilizer thereof, characterized in that said first carrier is a calcium phosphate or derivatives thereof having a solubility in water lower than 0.1 wt% at room temperature.
The invention relates to compositions in the form of a divided solid including hemipotassium phosphate (HKP) having a P2O5 content of between 59.0 and 60.8 wt %, which has an acidifying capactiy of at least 3.5 moles of H+/kg and, when sheltered form ambient humidity, a castability index lower than 25 and a caking index lower than 50. The invention also relates to a method for obtaining such compositions.
The invention relates to lithium-bearing iron phosphate in the form of micrometric mixed aggregates of nanometric particles, to an electrode and cell resulting therefrom and to the method for manufacturing same, which is characterized by a nanomilling step.
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
The invention relates to a method for producing phosphoric acid, including: attacking phosphate rock by means of sulfuric acid between 70º and 90º C with formation of a first calcium sulfate dihydrate crystal slurry, the aqueous acid phase of said slurry having free P2O5 content between 38 and 50 wt% and free SO3 content that is less than 0.5 wt% and greater than 0.05 wt%; converting said first slurry by means of heating at a temperature greater than 90º C, thus giving rise to a second slurry formed of calcium sulfate hemihydrate crystals; and, within the second slurry, separating a produced phosphoric acid, having a free SO3 content that is less than 2%, and a calcium sulfate hemihydrate filter cake.
The invention relates to a method for producing phosphoric acid, including: attacking phosphate rock by means of sulfuric acid between 70º and 90º C with formation of a first calcium sulfate dihydrate crystal slurry, the aqueous acid phase of said slurry having free P2O5 content between 38 and 50 wt% and free SO3 content that is less than 0.5 wt% and greater than 0.05 wt%; converting said first slurry by means of heating at a temperature greater than 90º C, thus giving rise to a second slurry formed of calcium sulfate hemihydrate crystals; and, within the second slurry, separating a produced phosphoric acid, having a free SO3 content that is less than 2%, and a calcium sulfate hemihydrate filter cake.
The invention relates to a method for producing polyphosphoric acid including spraying orthophosphoric acid into a flame, polymerizing/condensing the orthophosphoric acid into polyphosphoric acid, accompanied by forming hot gases and separating said hot gases flowing cocurrently with the polyphosphoric acid from said polyphosphoric acid. The invention also relates to a device for implementing same.
B01J 19/26 - Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
B01J 19/30 - Loose or shaped packing elements, e.g. Raschig rings or Berl saddles, for pouring into the apparatus for mass or heat transfer
B01J 19/32 - Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
CENTRE D'ETUDES ET DE RECHERCHES DES PHOSPHATES MINERAUX (Morocco)
PRAYON TECHNOLOGIES (Belgium)
Inventor
Kossir, Abdelaâli
Cappelle, Philippe
Abstract
The invention relates to a method for processing cadmiferous solids that contain anhydrite and/or hemihydrate calcium sulphate having a cadmium content, characetrised in that it comprises extracting the cadmium from said cadmiferous solids by putting them in contact with an aqueous solution of an alkaline metal, and carrying a solid/liquid separation between a solid phase containing dihydrate calcium sulphate with a low cadmium content relative to said cadmium content in the anhydrite and/or hemihydrate calcium sulphate, and an aqueous phase containing alkaline metal sulphate and cadmium in a solution.
The invention relates to a filtration cell that comprises a tank with a bottom wall (2) and four side walls extending upwards from the bottom wall as well as an upward opening, the four side walls including two opposite longitudinal walls (3, 5) as well as a front facing wall (4) and a rear facing wall connecting them, a filtration bed (7) supported in the tank, an outlet opening for discharging the filtrate, and a covering flap (24) protruding outwards from the top of one of said longitudinal walls, the longitudinal wall (5) opposed to that fitted with the flap including a lower portion (25) extending upwards from the bottom wall (2) and an upper portion (26) extending slantedly upwards and inside the tank from the top of said lower portion (25), and/or the front facing wall (4) comprises a bottom portion (27) extending upwards from the bottom wall (2) and a top portion (28) extending slantedly upwards and inside the tank from the top of said bottom portion (27).
B01D 33/19 - Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with rotary filtering tables the table surface being divided in successively tilted sectors or cells, e.g. for discharging the filter cake
patents
