Method for concentrating and purifying titanium dioxide waste acid by using complex acid

A technology for concentration and purification of titanium dioxide waste acid, which is applied to chemical instruments and methods, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problem that the waste heat of the exhaust gas of rotary kiln calcination is not effectively utilized, and achieve the reduction of titanium content and reduction The effect of condensing cost and less investment

Inactive Publication Date: 2013-04-03
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the production of titanium dioxide by sulfuric acid method, high-temperature calcination is required to achieve desulfurization and conversion of metatitanic acid. The equipment for calcination is a rotary kiln. The tail temperature of the calcination rotary kiln is 300 ° C ~ 450 ° C. Generally, SO is absorbed by spraying alkali solution. 2 After environmental protection treatment, it is directly discharged to the atmosphere, and this part of the heat, that is, the waste heat of the calcined tail gas of the rotary kiln, has not been effectively utilized

Method used

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  • Method for concentrating and purifying titanium dioxide waste acid by using complex acid
  • Method for concentrating and purifying titanium dioxide waste acid by using complex acid
  • Method for concentrating and purifying titanium dioxide waste acid by using complex acid

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Effect test

Embodiment 1

[0032] The waste acid in the titanium dioxide production process, its main component, is calculated by mass ratio as: H 2 SO 4 21%, FeSO 4 8.5%, MgSO 4 2%, 0.5% metatitanic acid, through countercurrent spraying and rotary kiln calcined tail gas, use the waste heat of calcined tail gas to increase the concentration to 25%, and then recover metatitanic acid through waste acid flocculation and sedimentation to obtain clear waste acid; add waste acid to In the waste acid configuration tank, add concentrated sulfuric acid with a sulfuric acid mass fraction of 98%, add 1t of concentrated sulfuric acid for every 3.5t of waste acid, and mix the two evenly to obtain a mixed acid. Then carry out gradient cooling and aging, the gradient cooling range is 8°C / h, and the aging time is 10h; when the temperature drops below 60°C, all the mixed acid is poured into a filter press for solid-liquid separation, and the liquid phase is separated to obtain sulfuric acid . The mass fraction is 4...

Embodiment 2

[0034] The waste acid in the production process of titanium dioxide, its mass ratio is: H 2 SO 4 21%, FeSO 4 8.5%, MgSO 42%, 0.5% metatitanic acid, through countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to increase the concentration to 28%, and then recover metatitanic acid through waste acid flocculation and sedimentation to obtain clear waste acid. Add the spent acid to the spent acid configuration tank, then add concentrated sulfuric acid with a sulfuric acid mass fraction of 96%, add 1t of concentrated sulfuric acid for every 2.3t of spent acid, and mix the two evenly to obtain a mixed acid. Then carry out gradient cooling and aging, the range of gradient cooling is 5°C / h, and the aging time is 8h. When the temperature drops below 62°C, all the mixed acid is poured into the filter press for solid-liquid separation, and the liquid phase is separated to obtain sulfuric acid. The mass fraction is 50.3%, the iron co...

Embodiment 3

[0036] The waste acid in the production process of titanium dioxide, its mass ratio is: H 2 SO 4 21%, FeSO 4 8.5%, MgSO 4 2%, TiO metatitanate 2 0.5%, through countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to concentrate to 32%, and then recover metatitanic acid through waste acid flocculation and sedimentation to obtain clear waste acid. Add the spent acid to the spent acid configuration tank, then add concentrated sulfuric acid with a sulfuric acid mass fraction of 93%, add 1t of concentrated sulfuric acid for every 1.5t of spent acid, and mix the two evenly to obtain a mixed acid. Then carry out gradient cooling and aging, the range of gradient cooling is 2°C / h, and the aging time is 7h. When the temperature drops below 65°C, all the mixed acid is poured into the filter press for solid-liquid separation, and the liquid phase is separated to obtain sulfuric acid. The mass fraction is 58.2%, the iron content in su...

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Abstract

The invention discloses a method for concentrating and purifying titanium dioxide waste acid by using complex acid. The method comprises the following specific steps of: titanium recovery: primarily concentrating waste acid produced in a titanium dioxide production process by using waste heat of calcining tail gas of a ring kiln to achieve the mass concentration being 25-32%, and then recovering titanium; acid mixing: uniformly mixing the waste acid subjected to titanium recovery and concentrated sulfuric acid in an acid mixing tank according to a mass proportion of (1.2-4):1 to obtain mixed acid; and crystallization: carrying out gradient cooling, crystallizing, curing and filtering on the mixed acid gradually in the acid mixing tank, and when the temperature of the mixed acid is reduced to 60-65 DEG C, pumping the mixed acid into a filter press for solid-liquid separation to obtain concentrated sulfuric acid and ferrous dregs. The method disclosed by the invention has the advantage of changing the traditional method for concentrating the titanium dioxide waste acid by depending on natural gas, steam, fire coal hot gas and other heat sources, is free from consuming a large amount of energy sources and capable of reducing the cost in waste acid concentration, and is high in recovery rate of the waste acid.

Description

technical field [0001] The invention relates to a technology for concentrating waste acid, in particular to a method for concentrating and purifying titanium dioxide waste acid by using acid compounding. Background technique [0002] The scientific name of titanium dioxide is titanium dioxide, which is an inert pigment. It is considered to be a white pigment with the best performance in the world. It is widely used in the manufacture of coatings, synthetic fibers, advanced white paint, white rubber, printing, metallurgy and other industries. [0003] The production of titanium dioxide by the sulfuric acid method, the main raw materials are titanium ore and sulfuric acid, has the advantages of low production cost and mature technology, and is a method commonly used in the existing production methods of titanium dioxide. However, every 1t of titanium dioxide produced by the sulfuric acid method needs to consume more than 4t of sulfuric acid, and at the same time produce about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C01B17/88
CPCY02P20/129
Inventor 林发蓉文军蔡平雄曾小林朱全芳
Owner SICHUAN LOMON TITANIUM IND CO LTD
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