Method for producing vitriol and iron ore concentrate using ferrous sulfate

A technology of ferrous sulfate and iron concentrate, which is applied in the field of chemical industry and metallurgy, and can solve the problems that it is difficult to meet the requirements of ironmaking, and the grade of iron in sulfuric acid slag is low and not much.

Inactive Publication Date: 2007-07-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the mixed firing amount of ferrous sulfate is generally about 20%, and it can reach 40% to 50% in foreign countries, but the addition of ferrous sulfate makes it more difficult to control the temperature of the fluidized fluidized furnace, and the iron grade of sulfuric acid slag is still low. , it is difficult to meet the requirements of ironmaking, and there are not many domestic applications at present

Method used

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  • Method for producing vitriol and iron ore concentrate using ferrous sulfate
  • Method for producing vitriol and iron ore concentrate using ferrous sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Ferrous sulfate heptahydrate contains FeSO 4 ·7H 2 O97%, MgSO 4 ·7H 2 O 1.4%, water-insoluble matter 1.1%, other 0.5%.

[0047] The ferrous sulfate heptahydrate is added to the indirect heating rotary kiln, and the drying temperature is kept at 300°C to remove the seven crystal water. The total moisture content is controlled to 1% by adjusting the drying temperature and drying time. The flue gas is emptied after dust collection and purification. , Dust and dry materials are anhydrous ferrous sulfate.

[0048] Anhydrous ferrous sulfate is added to the indirect heating rotary kiln. At the same time, CO is added to the rotary kiln. The indirect heating temperature is controlled at 950℃. The time is controlled to make the decomposition rate of ferrous sulfate 99.0%. The amount of CO added is controlled to make the ferrous sulfate Among the decomposed gas products, the mass ratio K of sulfur trioxide and sulfur dioxide is 0.05. The flue gas of the rotary kiln is accelerated to 15 ...

Embodiment 2

[0055] Ferrous sulfate heptahydrate contains FeSO 4 ·7H 2 O96%, MgSO 4 ·7H 2 O 1.4%, water-insoluble matter 1.1%, others 1.5%.

[0056] The ferrous sulfate heptahydrate is added to the direct heating rotary kiln, and the drying temperature is maintained at 350°C to remove the seven crystal water. The total moisture content is controlled to 1% by adjusting the drying temperature and drying time. The flue gas is emptied after dust collection and purification. , Dust and dry materials are anhydrous ferrous sulfate.

[0057] Anhydrous ferrous sulfate is added to the indirect heating rotary kiln. At the same time, C is added to the rotary kiln. The indirect heating temperature is controlled at 1000℃. The time is controlled to make the decomposition rate of ferrous sulfate 99.9%. The amount of C added is controlled to make the ferrous sulfate Among the decomposed gas products, the mass ratio K of sulfur trioxide and sulfur dioxide is 0.01. The flue gas of the rotary kiln is accelerated ...

Embodiment 3

[0064] Ferrous sulfate heptahydrate contains FeSO 4 ·7H 2 O 94%, MgSO 4 ·7H 2 O 2.4%, water-insoluble matter 2.1%, others 1.5%.

[0065] The ferrous sulfate heptahydrate is added to the continuous wok, and the drying temperature is maintained at 250°C to remove the seven crystal water. The total moisture is controlled to 2% by adjusting the drying temperature and drying time. The flue gas is emptied after dust collection and purification. The dust and dry material is anhydrous ferrous sulfate.

[0066] Anhydrous ferrous sulfate is added to the indirect heating rotary kiln. At the same time, C is added to the rotary kiln. The indirect heating temperature is controlled at 700℃. The time is controlled to make the decomposition rate of ferrous sulfate 97%. The amount of C added is controlled to make the ferrous sulfate Among the decomposed gas products, the mass ratio K of sulfur trioxide and sulfur dioxide is 0.1. The flue gas of the rotary kiln is accelerated to 7 m / s by the fan, an...

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Abstract

The invention discloses a manufacturing method of sulfuric acid and fine ferric ore based on ferrous sulfate heptahydrate as by-product of titanium oxide, which is characterized by the following: heating anhydrous ferrous sulfate in the rotary kiln at 700-1000 deg. c; decomposing to obtain fine ferric ore and sulfur oxide gas under reducing atmosphere; using normal two-rotation two-adsorption technique to make sulfuric acid; purifying flue gas for sulfur trioxide and little of sulfur dioxide; adsorbing sulfur trioxide through concentrated sulfuric acid to produce fuming nitric acid; making residual sulfur dioxide gas into normal one-rotation one-adsorption technique to make sulfuric acid.

Description

Technical field: [0001] The invention relates to a method for producing sulfuric acid and iron concentrate by using ferrous sulfate, and belongs to the technical field of chemical metallurgy. Background technique: [0002] In recent years, the annual output of titanium dioxide in my country has reached 800,000 tons, most of which are produced by the sulfuric acid method. Each ton of titanium dioxide produced by the sulfuric acid method will produce 3.5-4.0 tons of ferrous sulfate heptahydrate. According to this estimate, my country's annual by-product ferrous sulfate of titanium dioxide is about 3 million tons. Ferrous sulfate is easily soluble in water and difficult to stack. After dissolution, it flows into rivers and lakes, causing serious environmental pollution. In addition, ferrous sulfate is a resource containing sulfur and iron, which causes a waste of resources after the loss. Therefore, ferrous sulfate is large-scale, High-efficiency utilization is of great significance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/69C01G49/06
Inventor 文书明张文彬
Owner KUNMING UNIV OF SCI & TECH
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