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A method for improving the grade of vanadium slag by using titanium dioxide waste acid

A technology for titanium dioxide waste acid and vanadium slag, which is applied in the direction of recycling technology, improvement of process efficiency, ferric sulfate, etc., can solve the problems of enterprise burden, troubled enterprises, high direct neutralization treatment cost, and achieve the improvement of vanadium slag grade, To achieve the effect of comprehensive management

Inactive Publication Date: 2015-08-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this process is that the amount of "three wastes" is large, especially acidic waste liquid. Every 1 ton of titanium dioxide produced produces 6-8 tons of high-acid waste liquid (waste sulfuric acid) with a concentration of about 20% and 50-80 tons of high-acid waste liquid with a concentration of 20%. 2% to 6% low-acid washing liquid, especially the high-acid waste liquid, the cost of direct neutralization treatment is too high, which causes a heavy burden on the enterprise, and direct discharge will seriously pollute the environment
The management of titanium dioxide waste acid has seriously plagued enterprises and even affected the survival of the titanium dioxide industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040]Add 400mL of titanium dioxide waste acid to a 500mL clean beaker, and perform precision filtration to remove insoluble impurities in titanium dioxide waste acid. Take 100g of finely ground vanadium slag with a particle size of 80 mesh, add 50ml of water, heat the water bath to 50°C after mixing, control the stirring speed at 100r / min, add the waste titanium white acid after cleaning, and control the leaching time at 0.5 h, the pH value is controlled at 0.5. After filtering and washing, high-grade vanadium slag was obtained, V 2 o 5 The content is 30.5wt%. The ferrous sulfate solution obtained after filtration is evaporated, condensed and concentrated at 60°C. When the concentration of ferrous sulfate reaches 500g / L, it is condensed, and the condensation temperature is controlled to be 0°C to crystallize to obtain ferrous sulfate heptahydrate.

example 2

[0042] Add 400mL of titanium dioxide waste acid to a 500mL clean beaker, and perform precision filtration to remove insoluble impurities in titanium dioxide waste acid. Take 100g of finely ground vanadium slag with a particle size of 80 mesh, add 300ml of water, heat the water bath to 100°C after mixing, control the stirring speed at 500r / min, add the waste titanium dioxide acid after impurity removal, and control the leaching time at 2h , the pH value is controlled at 4.0. After filtering and washing, high-grade vanadium slag was obtained, V 2 o 5 The content is 36.8%. The ferrous sulfate solution obtained after filtration is evaporated, condensed and concentrated at 100°C. When the concentration of ferrous sulfate reaches 500g / L, it is condensed, and the condensation temperature is controlled to be 10°C to obtain ferrous sulfate heptahydrate by crystallization.

example 3

[0044] Add 400mL of titanium dioxide waste acid to a 500mL clean beaker, and perform precision filtration to remove insoluble impurities in titanium dioxide waste acid. Take 100g of finely ground vanadium slag with a particle size of 80 mesh, add 50ml of water, heat the water bath to 90°C after mixing, control the stirring speed at 200r / min, add the waste titanium dioxide acid after impurity removal, and control the leaching time at 2h , the pH value is controlled at 1.5. After filtering and washing, high-grade vanadium slag was obtained, V 2 o 5 The content is 30.5%. The ferrous sulfate solution obtained after filtration is evaporated and condensed at 80° C., and when the concentration of ferrous sulfate reaches 600 g / L, it is condensed, and the condensation temperature is controlled to be 5° C., and crystallized to obtain ferrous sulfate heptahydrate.

[0045] In summary, the present invention uses industrial titanium dioxide waste acid as a leaching agent, utilizes the w...

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Abstract

The invention provides a method of improving vanadium slag grade by utilizing titanium white waste acid. The method is as follows: leaching the vanadium slag by titanium white waste acid with suspended matters removed by filtering; and then, filtering and washing to obtain high-vanadium vanadium slag and filtrate containing ferrous sulfate, wherein the titanium white waste acid is the waste acid produced by a process of producing titanium dioxide by a sulfuric acid method, and the vanadium slag is furnace slag produced after extracting vanadium and blowing for the vanadium-containing wastewater. According to the method disclosed by the invention, comprehensive treatment of the vanadium slag and the titanium white waste acid is realized, the vanadium slag grade is improved, and byproducts such as ferrous sulfate, and the like, further can be obtained.

Description

technical field [0001] The invention relates to the technical field of metallurgy and environmental protection, and more specifically relates to a method for improving the grade of vanadium slag by using waste titanium dioxide acid produced in the process of producing titanium dioxide by a sulfuric acid method. Background technique [0002] The vast majority of titanium dioxide production in my country adopts the sulfuric acid production process, mainly using titanium-containing materials such as ilmenite or titanium slag as raw materials. The production of titanium dioxide by the sulfuric acid method mainly includes: raw ore preparation; decomposing titanium-containing materials with sulfuric acid to prepare titanium sulfate solution ; solution purification and iron removal; hydrolysis of titanium sulfate solution to resolve metatitanic acid; calcination of metatitanic acid to obtain titanium dioxide and post-treatment procedures, etc. The biggest disadvantage of this proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/14C22B7/04
CPCY02W30/54Y02P10/20
Inventor 殷兆迁杨仰军郭继科彭一村
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP