The invention relates to a method for producing steel and foundry iron, wherein zinc-containing scrap is dezincified with an acidic solution and a zinc-containing solution is obtained, and the resulting zinc-free or low-zinc scrap is used to produce steel and foundry iron and the hydrogen formed during the dezincification is used in the steel works or in other industrial processes.
Subject of the invention is a process for the thermal treatment of materials in a kiln, wherein i) the kiln is an indirectly-heated rotary thermal reactor, and ii) electricity is used to heat the kiln, and wherein the electrical energy supply to the kiln fluctuates within a 24-hour period.
In a method of producing iron(II) sulfate heptahydrate, a material containing iron oxide is subjected to a pre-processing treatment to adjust the particle size and/or the water content thereof. The pre-processed raw materials are then reacted with sulfuric acid, followed by a reduction treatment with elementary iron to produce iron(II) sulfate. The iron(II) sulfate may be purified and crystallized as iron(II) sulfate monohydrate prior to crystallization as iron (II) sulfate heptahydrate
The claimed invention relates to a process for the treatment of a material comprising one or more phosphate compounds with low solubility in water, wherein the process comprises the steps of: i) introducing said material comprising one or more phosphate compounds, an alkali metal compound and an organic material as feed materials into a reactor, and ii) heating these feed materials at 750-1100 °C, preferably 800-1000°C, most preferably 850-1000 °C.
In a method for producing iron(II) sulfate heptahydrate, materials containing iron(II) chloride are purified, followed by reaction of the iron(II) chloride with sulfuric acid to yield iron(II) sulfate monohydrate. The iron(II) sulfate monohydrate is then converted into iron(II) sulfate heptahydrate.
The present invention relates to a method for treating salt-containing dusts which accumulate during operation of industrial plants, e.g. in waste incineration plants, or during operation of rotary kilns, e.g. in cement production plants or clinker production plants. The method comprises: a step a) of forming an aqueous solution by bringing salt-containing dusts into contact with an aqueous phase; a step b) of removing heavy metals from the aqueous solution; and a step c) of separating alkali metal chlorides from the aqueous solution; and salt-containing dusts are brought into contact with an aqueous solution in step a) by means of a multi-stage arrangement through which the salt-containing dusts and the aqueous phase pass in opposite directions.
In a method of producing iron(II) sulfate heptahydrate, a material containing iron oxide is subjected to a pre-processing treatment to adjust the particle size and/or the water content thereof. The pre-processed raw materials are then reacted with sulfuric acid, followed by a reduction treatment with elementary iron to produce iron(II) sulfate. The iron(II) sulfate may be purified and crystallized as iron(II) sulfate monohydrate prior to crystallization as iron(II) sulfate heptahydrate
The present invention is directed to a unit and/or process for treating mill scale containing hydrocarbons, which improves emission levels and allows better control of the temperature during the heating stage. The unit and/or process comprises an indirect-fired rotary thermal reactor (2), a pre-treatment duct (18), a two-stage recovery unit wherein the first stage comprises an oil recovering assembly (4) and the second stage comprises an oil and water condensing unit (6), a coalescing oil filtration system (8) and a reactor combustion chamber (17) for recycled fuel.
B01D 50/60 - Combinations of devices covered by groups and
B09B 3/40 - Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
C10B 47/30 - Other processes in rotary ovens or retorts
C10B 53/00 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
C10G 1/02 - Production of liquid hydrocarbon mixtures from oil shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by distillation
12.
PROCESS FOR OBTAINING ALKALI METAL CHLORIDES FROM BYPASS DUSTS
The present invention relates to a process for obtaining alkali metal chlorides from bypass dusts that are produced during the operation of rotary kilns, e.g. in cement or clinker manufacturing plants.
244222) production process. Said mixture of sulphuric acids has a concentration of sulphuric acid comprised from 42%wt to 50%wt, whereby the moles of said sulphuric acid in said mixture are in stoichiometric excess with respect to the moles of magnesium oxide, said stoichiometric excess being based on the actual moles of magnesium oxide and of calcium oxide in said calcined magnesite.
The present invention is directed to a unit and/or process for treating mill scale containing hydrocarbons, which improves emission levels and allows better control of the temperature during the heating stage. The unit and/or process comprises an indirect-fired rotary thermal reactor (2), a pre-treatment duct (18), a two-stage recovery unit wherein the first stage comprises an oil recovering assembly (4) and the second stage comprises an oil and water condensing unit (6), a coalescing oil filtration system (8) and a reactor combustion chamber (17) for recycled fuel.
The present application relates to a process for the purification of waste materials or industrial by-products, the process comprising the steps of: a) Preparing a composition (C) by blending or mixing waste materials or industrial by-products comprising chlorine (B) with one or more materials comprising heavy metals (HM) b) Reacting (B) and (HM) by thermal treatment of (C) c) Separating evaporated heavy metal chloride compounds (HMCC) d) Obtaining a solid material after the thermal treatment step.
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