Method for enriching scandium, titanium and vanadium from sulfuric acid method titanium dioxide waste acid, and for treating waste acid

A technology for the treatment of titanium dioxide waste acid and waste acid, which is applied in neutralization water/sewage treatment, chemical instruments and methods, natural water treatment, etc. It can solve problems such as complex process and achieve the effect of reducing extraction costs
CN103540752AInactive Publication Date: 2014-01-29广西冶金研究院有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
广西冶金研究院有限公司
Publication Date
2014-01-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for enriching scandium, titanium and vanadium from sulfuric acid method titanium dioxide waste acid, and for treating waste acid. The method comprises the steps that: titanium dioxide waste acid is subjected to two-stage neutralization by using calcium carbonate, such that white gypsum is obtained, and two-stage neutralization slag with enriched scandium, titanium and vanadium are obtained; the two-stage neutralization slag is dissolved by using titanium dioxide waste acid; the dissolution liquid is subjected to scandium extraction and stripping, such that crude scandium slag is obtained; scandium extraction residue liquid is subjected to titanium hydrolysis, such that high-titanium slag is obtained; the hydrolysis filtrate is subjected to neutralization vanadium precipitation by using sodium carbonate, such that vanadium slag is obtained; the liquid after vanadium precipitation is subjected to aeration and further neutralization with the two-stage neutralization filtrate, and can reach a discharge standard and can be discharged. With the method provided by the invention, scandium, titanium and vanadium can be effectively enriched from titanium dioxide waste acid, and the treated waste acid tail liquid can reach a discharge standard and can be discharged.
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Description

technical field

[0001] The invention relates to a method for enriching scandium, titanium and vanadium from waste acid of titanium dioxide by sulfuric acid method and treating the waste acid thereof. Background technique

[0002] At present, the treatment methods of titanium dioxide waste acid by sulfuric acid method mainly include dolomite upflow expansion neutralization method and lime neutralization method. The world-wide sulfuric acid method titanium dioxide plants mainly use methods similar to lime neutralization. In addition, many domestic and foreign manufacturers and scientific researchers have proposed to use waste acid with ore to produce manganese sulfate, aluminum sulfate, zinc sulfate and other products, but these treatment methods have the disadvantages of low leaching rate of ore active components, difficult solid-liquid separation, and product Poor quality, causing secondary pollution and other problems.

[0003] In addition to a large amount of sulfuric aci...

Claims

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