A kind of bleaching method of titanium dioxide

A technology of titanium dioxide and metatitanic acid, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve problems such as increased economic costs

Active Publication Date: 2014-10-22
PANZHIHUA CHUANGXINJIA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because a large amount of sulfuric acid must be added in the bleaching process, the added sulfuric acid needs to be neutralized by adding lime in the process of sewage treatment to eliminate environmental hazards, resulting in increased economic costs

Method used

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  • A kind of bleaching method of titanium dioxide
  • A kind of bleaching method of titanium dioxide
  • A kind of bleaching method of titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, a kind of bleaching method of titanium dioxide, comprises the following steps:

[0017] (1) Take the metatitanic acid slurry and add sodium sulfoxylate formaldehyde into the slurry as a reducing agent;

[0018] (2) Add a stirring device to stir the slurry. During the stirring process, the sodium bisulfite formaldehyde decomposes to generate a reduction factor, which reduces the Fe present in the slurry 3+ reduced to Fe 2+ ;

[0019] (3) Suction filter the fully reduced slurry and wash it with deionized water to obtain bleached metatitanic acid.

[0020] In the method, sodium hydrogen sulfoxylate formaldehyde is used as a reducing agent, and sodium hydrogen sulfoxylate formaldehyde has a strong reducing ability and does not need to carry out reduction reaction at a slurry with a lower pH. Sodium bisulfite formaldehyde in the slurry can be decomposed to generate a reducing factor with strong reducing ability, which can reduce the Fe present in the slurry ...

Embodiment 2

[0022] Embodiment 2, a kind of bleaching method of titanium dioxide, comprises the following steps:

[0023] (1) Take the metatitanic acid slurry and add sodium sulfoxylate formaldehyde into the slurry as a reducing agent;

[0024] (2) Add a stirring device to stir the slurry. During the stirring process, the sodium bisulfite formaldehyde decomposes to generate a reduction factor, which reduces the Fe present in the slurry 3+ reduced to Fe 2+ ;

[0025] (3) Suction filter the fully reduced slurry and wash it with deionized water to obtain bleached metatitanic acid.

[0026] In the method, sodium hydrogen sulfoxylate formaldehyde is used as a reducing agent, and sodium hydrogen sulfoxylate formaldehyde has a strong reducing ability and does not need to carry out reduction reaction at a slurry with a lower pH. Sodium bisulfite formaldehyde in the slurry can be decomposed to generate a reducing factor with strong reducing ability, which can reduce the Fe present in the slurry ...

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Abstract

The invention relates to the field of titanium dioxide production, and particularly relates to a bleaching method of titanium dioxide. The method comprises the following steps of: taking metatitanic acid slurry, and adding sodium formaldehyde sulfoxylate as a reducing agent in the slurry; additionally arranging a stirring device for carrying out stirring on the slurry, and in the process of stirring, generating reducing factors due to the decomposition of the sodium formaldehyde sulfoxylate, reducing Fe3+ existing in the slurry into Fe2+ by using the reducing factors; and carrying out suction filtration on the completely reduced slurry, and washing the obtained product by using deionized water so as to obtain a bleached metatitanic acid. According to the bleaching method of titanium dioxide provided by the invention, because no additional sulfuric acid is required to be added in the process of bleaching, in the late sewage treatment, the neutralization treatment on the sulfuric acid can be reduced, thereby reducing the economic cost.

Description

technical field [0001] The invention relates to the field of titanium dioxide production, in particular to a bleaching method for titanium dioxide. Background technique [0002] The raw material for the production of titanium dioxide is ilmenite, which is acidolyzed in sulfuric acid to generate Ti(SO 4 ) 2 , Fe 2 (SO 4 ) 3 and FeSO 4 , Ti(SO 4 ) 2 After hydrolysis, metatitanic acid slurry is generated. The iron element contained in the raw material will be mainly in the form of Fe in the metatitanic acid slurry 3+ and Fe 2+ Exists in the form of Fe 3+ It is easily hydrolyzed to form Fe(OH) during washing 3 Precipitate and mix in metatitanic acid, Fe(OH) 3 The precipitate is reddish brown, which seriously affects the whiteness of titanium dioxide, so in the production of titanium dioxide, iron ions must be removed by bleaching. [0003] In related technologies, the bleaching method of titanium dioxide mainly selects Ti 3+ As a reducing agent, Ti 3+ The reductio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00
Inventor 刘征东周旭
Owner PANZHIHUA CHUANGXINJIA TECH
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