Method for directly preparing sulfate and ferric oxide by ferrous sulfate

A ferrous sulfate and iron oxide technology, which is applied in the directions of iron oxide, chemical instruments and methods, iron oxide/iron hydroxide, etc., can solve the problems of cumbersome process and high cost of comprehensive utilization of ferrous sulfate, so as to improve economic benefits and save money. cost, effect of reducing environmental emissions

Inactive Publication Date: 2013-05-01
ALFA FULL GUANGXI TENG COUNTY TITANIUM DIOXIDE
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to propose a comprehensive method and equipment for ferrous sulfate in view of the shortcomings of the existing comprehensive utilization of ferrous sulfate, such as high cost and cumbersome process

Method used

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  • Method for directly preparing sulfate and ferric oxide by ferrous sulfate

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Experimental program
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Effect test

Embodiment 1

[0051] Put 1 ton of ferrous sulfate heptahydrate into the low-temperature equipment, and dry the ferrous sulfate heptahydrate with hot air with a waste heat temperature of 270-450 °C for 20 to 40 minutes, and then dry the generated anhydrous ferrous sulfate. Transfer to a high temperature equipment, under the condition of isolating air, use 800-900 ℃ hot air to pyrolyze anhydrous ferrous sulfate for 100-160 minutes, and the iron oxide produced by the decomposition is transferred into the heat exchange kettle 5. The cooling water of the boiler is cooled to room temperature to obtain 226Kg of iron fine powder. The produced sulfur dioxide and sulfur trioxide are removed from the sulfuric acid production section to produce 320Kg of 98% sulfuric acid. The superheated steam from the heat exchange kettle is removed from the titanium dioxide hydrolysis section. Rotary kiln is used for low temperature equipment, and drum heating equipment is used for high temperature equipment.

Embodiment 2

[0053] Put 1 ton of ferrous sulfate heptahydrate into the low-temperature equipment, and dry the ferrous sulfate heptahydrate for 40 to 60 minutes with hot air with a waste heat temperature of 400-500 °C generated by the jacket of the high-temperature equipment, and then dry the generated anhydrous ferrous sulfate. Transfer to high temperature equipment, under the condition of isolating air, use hot air at 850-950 ℃ to pyrolyze anhydrous ferrous sulfate for 30-60 minutes, the iron oxide produced by decomposition is transferred into the heat exchange kettle, The cooling water is cooled to room temperature to obtain 226Kg of iron fine powder, the produced sulfur dioxide and sulfur trioxide are removed from the sulfuric acid production section to produce 320Kg of 98% sulfuric acid, and the superheated steam from the heat exchange kettle is removed from the titanium dioxide hydrolysis section. The low temperature equipment adopts the drum type heating equipment, and the high temper...

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Abstract

The invention provides a method for directly preparing sulfate and ferric oxide by ferrous sulfate. The method comprises the following steps of firstly, carrying out primary heating on the ferrous sulfate with crystallizing water to form anhydrous ferrous sulfate or monohydrate ferrous sulfate; then, carrying out secondary heating on the anhydrous ferrous sulfate or the monohydrate ferrous sulfate, decomposing into a mixing gas of sulfur dioxide and sulfur trioxide and a ferric oxide solid, delivering the gas of sulfur dioxide and sulfur trioxide into a reformer to produce sulfate by a conventional catalyzing method, and directly using the ferric oxide solid as ferric smelting raw material of iron plants or for the production of ferric pigments, wherein the primary heating and the secondary heating are indirect heating, and a heat source of the indirect heating is a direct hot blast stove or residual heat recovered from a high-temperature combustion furnace or a high-temperature reaction furnace. The method has the advantages that the problem of treating wastes of ferrous sulfate is solved, the ferric and sulfur resources in the ferrous sulfate of industrial wastes are maximumly utilized, and a recycled and economic utilization mode is formed.

Description

technical field [0001] The invention relates to a method for directly preparing sulfuric acid and iron oxide from ferrous sulfate, and belongs to the field of comprehensive utilization of waste. Background technique [0002] Ferrous sulfate usually refers to ferrous sulfate heptahydrate (FeSO4 7H2O) containing crystal water, blue-green monoclinic crystals or particles, commonly known as "green vitriol". Odorless. Weathered in dry air. The surface oxidizes to brown basic ferric sulfate in humid air. It becomes a tetrahydrate at 56.6°C and a monohydrate at 65°C. Anhydrous ferrous sulfate (white powder) can be obtained when dried at 300°C. [0003] For the application of ferrous sulfate, it is currently mainly used to make iron salts, iron oxide pigments, mordants, water purifiers, preservatives, disinfectants, etc. Chronic blood loss caused by fibroids; analytical reagents and raw materials for ferrite production; iron fortifiers as feed additives; can be used as pesticid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74C01G49/06
CPCY02P20/10
Inventor 容小邕龙庆国
Owner ALFA FULL GUANGXI TENG COUNTY TITANIUM DIOXIDE
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