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Recycling method of titanium dioxide waste acid

A technology of titanium dioxide waste acid and white waste acid clear solution, which is applied in the fields of chemical instruments and methods, ferric sulfate, inorganic chemistry, etc., and can solve the problem of high, low recovery rate of titanium dioxide waste acid, and ineffective concentrated sulfuric acid. Recycling and other issues to achieve the effect of improving the recovery rate

Active Publication Date: 2018-10-23
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, this method still has certain defects: ferrous slag is usually used for sulfuric acid blending, ferrous feed monohydrate preparation, etc., so there should be no high sulfuric acid content in ferrous slag, high sulfuric acid content will directly affect its downstream use However, in the existing one-step acid mixing method, the sulfuric acid content in the ferrous slag reaches 35% (mass percentage), which not only affects the quality of downstream products, but also leads to the incompatibility between the titanium dioxide waste acid and the added concentrated sulfuric acid. effective recycling
In the one-step acid mixing process, most of the ferrous sulfate has been precipitated to form crystals in the final stage of cooling the configured mixed acid, and the content of ferrous sulfate dissolved in the mixed acid is getting less and less, so the crystal particles formed at the beginning are larger. Then it becomes smaller and smaller, and finally a large number of fine and unevenly distributed ferrous sulfate monohydrate particles are often formed in the mixed acid, which makes it difficult to filter the whole ferrous slag, and the liquid consumption is high (usually greater than 30%). Titanium white waste acid Low recovery rate

Method used

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  • Recycling method of titanium dioxide waste acid

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Experimental program
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Effect test

Embodiment 1

[0032] (1) The waste acid in the production process of titanium dioxide, its main component, is calculated by mass ratio as: H 2 SO 4 20.51%, FeSO 4 9.13%, Al 2 (SO 4 ) 3 0.66%, MgSO 4 2.16%, TiO 2 0.36%, after countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to enrich to H 2 SO 4 The mass concentration is 28%, and after the metatitanic acid is recovered by flocculation and sedimentation, the waste acid clear liquid is obtained.

[0033](2) Add the metered titanium dioxide waste acid to the acid mixing tank, start stirring, slowly add the metered 98 acid until the sulfuric acid mass concentration of the mixed acid is 75%, fully stir, and cool down to 65 at a cooling rate of 6°C / h ℃, and then heat-preserved for 2 hours to obtain a mixed acid.

[0034] (3) Add measured amount of titanium white waste acid to the primary mixed acid until the mass concentration of sulfuric acid in the mixed acid is 50%, fully stir, an...

Embodiment 2

[0037] (1) The waste acid in the production process of titanium dioxide, its main component, is calculated by mass ratio as: H 2 SO 4 20.51%, FeSO 4 9.13%, Al 2 (SO 4 ) 3 0.66%, MgSO 4 2.16%, TiO 2 0.36%, after countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to enrich to H 2 SO 4 The mass concentration is 28%, and after the metatitanic acid is recovered by flocculation and sedimentation, the waste acid clear liquid is obtained.

[0038] (2) Add the metered titanium white waste acid to the acid mixing tank, start stirring, slowly add the metered 98 acid until the sulfuric acid mass concentration of the mixed acid is 60%, fully stir, and cool down to 65 at a cooling rate of 6°C / h ℃, and then heat-preserved for 2 hours to obtain a mixed acid.

[0039] (3) Add measured amount of titanium white waste acid to the primary mixed acid until the mass concentration of sulfuric acid in the mixed acid is 50%, fully stir, and...

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Abstract

The invention relates to a processing technology of titanium dioxide byproducts generated in a sulfuric acid method, and particularly discloses a recycling method of titanium dioxide waste acid. The method includes the following steps that 1, titanium is recycled, and titanium dioxide waste acid clear liquid is obtained; 2, primary acid blending is carried out, wherein concentrated sulfuric acid is added into the titanium dioxide waste acid clear liquid, the mass concentration of sulfuric acid in titanium dioxide waste acid is regulated to be 60-80%, and primary mixed acid is obtained; 3, secondary acid blending is carried out, wherein titanium dioxide waste acid is added into the primary mixed acid, the mass concentration of sulfuric acid in the primary mixed acid is regulated to be 50-60%, and secondary mixed acid is obtained; 4, the secondary mixed acid is subjected to solid-liquid separation, and concentrated sulfuric acid and ferrous sulfate slag are obtained. The method has the advantages that the recycling rate of titanium dioxide waste acid is increased; ferrous sulfate slag with a very low sulfuric acid content can be obtained through recycling, and the high-quality ferrous sulfate monohydrate resource can be obtained.

Description

technical field [0001] The invention relates to a sulfuric acid method titanium dioxide production process, in particular to a treatment method for by-products in the sulfuric acid method titanium dioxide production process. 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 produce 4.5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/88C01G49/14
CPCC01B17/88C01G49/14
Inventor 代堂军姚恒平周晓葵朱全芳
Owner SICHUAN LOMON TITANIUM IND CO LTD