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Comprehensive utilization method of titanium dioxide waste acid by sulfuric acid process

A technology of titanium dioxide waste acid and sulfuric acid method, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problem of high cost, and achieve the effects of strong ability, cost reduction and simple process steps

Inactive Publication Date: 2010-09-08
潘修枢 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of limestone neutralization to treat titanium dioxide waste acid is also relatively high, about 800 yuan / ton Titanium dioxide waste acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Grind the copper oxide ore to 200 mesh, add 2000ml of titanium white waste acid with a sulfuric acid mass concentration of 8.20% under stirring conditions, react at room temperature for 6.5 hours, filter the obtained slurry, and reduce the filtrate with iron powder to obtain sponge copper with a grade of 83%. The copper yield of the whole process is 82.14%, the net consumption of 200g of ore powder is 1.046L of titanium white waste acid with a sulfuric acid mass concentration of 8.20%, and the residue filter cake is 260g. After calculation, the cost of treating titanium dioxide waste acid by the method of the present invention is 570 yuan / ton · titanium dioxide waste acid.

[0019] 1.046L of titanium dioxide waste acid with the same concentration was treated by lime neutralization method, and 368g of residue filter cake was obtained, and the treatment cost was 780 yuan / ton·titanium dioxide waste acid.

Embodiment 2

[0021] Grind the zinc oxide ore to 200 mesh, add 1800ml of titanium white waste acid with a mass concentration of sulfuric acid of 8.20% under stirring conditions, react at room temperature for 6.5 hours, filter the obtained slurry, the leaching rate of zinc is 92.58%, and the net consumption of sulfuric acid in 300g of ore powder 1.67L of titanium dioxide waste acid with a mass concentration of 8.20%, and 400g of residue filter cake. After calculation, the cost of treating titanium dioxide waste acid by the method of the present invention is 605 yuan / ton · titanium dioxide waste acid.

[0022] The lime neutralization method was used to treat 1.67L of titanium dioxide waste acid with the same concentration, and 468g of residue filter cake was obtained, and the treatment cost was 800 yuan / ton·titanium dioxide waste acid.

Embodiment 3

[0024] Grind the copper oxide ore to 200 mesh, add 1600ml of titanium white waste acid with a mass concentration of sulfuric acid of 12.91% under stirring conditions, react at 40°C for 4.0h, filter the obtained slurry, and reduce the filtrate with iron powder to obtain sponge copper with a grade of 82.2% , the copper yield of the whole process is 85.03%, the net consumption of 200g ore powder is 0.73L of titanium white waste acid with a mass concentration of sulfuric acid of 12.91%, and the residue filter cake is 265g. After calculation, the cost of treating titanium dioxide waste acid by the method of the present invention is 550 yuan / ton · titanium dioxide waste acid.

[0025] The lime neutralization method was used to treat 0.73L of titanium dioxide waste acid with the same concentration, and 337g of residue filter cake was obtained, and the treatment cost was 1030 yuan / ton·titanium dioxide waste acid.

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Abstract

The invention relates to a comprehensive utilization method of titanium dioxide waste acid by a sulfuric acid process, which belongs to the field of waste acid treatment. The invention solves the technical problem to provide a comprehensive utilization method of the titanium dioxide waste acid by the sulfuric acid process with lower cost. The comprehensive utilization method comprises the following steps: adopting ores containing copper oxide or zinc oxide to neutralize the titanium dioxide waste acid and filtering to obtain copper sulfate and zinc sulfate solution; adopting iron powder to reduce copper sulfate so as to prepare copper sponge; and electrolyzing zinc sulfate to prepare zinc, wherein the waste liquid obtained by preparing the copper sponge or the waste liquid obtained by electrolyzing the zinc sulfate is neutralized by lime and then is discharged when reaching the standard. The method of the invention has simple process steps, less investment, strong process ability of the titanium dioxide waste acid, does not additionally consume resources such as water, acid and the like, and provides a new way for the treatment of the titanium dioxide waste acid and has wide application prospect.

Description

technical field [0001] The invention relates to a comprehensive utilization method of titanium white waste acid from a sulfuric acid process, and belongs to the field of waste acid treatment. Background technique [0002] The sulfuric acid method is one of the main methods for producing titanium dioxide, which has the advantages of low requirements on ore, simple operation, and low investment. More than 98% of titanium dioxide in my country is produced by this method. However, the sulfuric acid method has great environmental protection pressure, especially the waste acid treatment. On average, every 1 ton of titanium produced will produce 5-7 tons of waste acid with a sulfuric acid mass concentration of about 20%. [0003] At present, there are mainly three methods for the treatment of titanium dioxide waste acid at home and abroad: [0004] Diffusion dialysis, that is, using a diffusion dialyzer to separate waste acid to produce dialysate and permeate. The dialysate conta...

Claims

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Application Information

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IPC IPC(8): C22B7/00C02F1/66C25C1/16C22B15/00
CPCY02P10/20
Inventor 路瑞芳杜剑桥唐勇
Owner 潘修枢