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

Inactive Publication Date: 2014-01-29
广西冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of extracting vanadium from titanium dioxide waste acid, Japan Ishihara Sangyo Co., Ltd. uses the ammonia neutralization sintering leaching process to prepare ammonium metavanadate. It is reported that this set of waste acid treatment process has been industrialized, but because the process is too Complicated, it is difficult for my country's small and medium-sized titanium dioxide factories to imitate
However, there is no relevant report on the research on directly extracting titanium from titanium dioxide waste acid.

Method used

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

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Embodiment 1

[0022] like figure 1 , figure 2 As shown, the method for enriching scandium, titanium and vanadium and the waste acid treatment thereof from the waste acid of titanium dioxide by sulfuric acid method of the present invention comprises the following steps:

[0023] Add H to a 200L reaction tank + 100L of titanium dioxide waste acid with a concentration of 5.92mol / L, in which Sc 2 O 3 The content is 32.8mg / L, V 2 O 5 The content is 1.00g / L, TiO 2 The content is 7.00g / L, and 30kg calcium carbonate is added to carry out one-stage neutralization. The pH value of the reaction end point is 1.0-2.0. 2 O 3 The content is 16.74mg / L, V 2 O 5 The content is 0.52g / L, TiO 2 The content is 3.7g / L. This step Sc 2 O 3 , V 2 O 5 and TiO 2 The recoveries were 86.76%, 88.4% and 89.86%, respectively.

[0024] Add 3kg of calcium carbonate to the first-stage neutralization filtrate to carry out the second-stage neutralization. The pH value of the reaction end point is 4.0 to 5.0. A...

Embodiment 2

[0031] In a 200L reaction tank, add 100L of titanium dioxide waste acid with a H concentration of 5.51mol / L, wherein Sc 2 O 3 The content is 24.5mg / L, V 2 O 5 The content is 0.87g / L, TiO 2 The content is 6.76g / L, and 27kg of calcium carbonate is added for one-stage neutralization. The pH value of the reaction end point is 1.0-2.0. After pressure filtration and two washings, a first-stage neutralization filtrate and white gypsum are obtained. 2 O 3 The content is 12.52mg / L, V 2 O 5 The content is 0.46g / L, TiO 2 The content is 3.52g / L. This step Sc2 O 3 , V 2 O 5 and TiO 2 The recoveries were 88.67%, 89.89% and 88.52%, respectively.

[0032] Add 2.7kg of calcium carbonate to the first-stage neutralization filtrate to carry out the second-stage neutralization. The pH value of the reaction end point is 4.0 to 5.0. After pressure filtration, the second-stage neutralization slag and the second-stage neutralization filtrate are obtained. The Sc in the second-stage neutral...

Embodiment 3

[0039] Add H to a 200L reaction tank + 100L of titanium dioxide waste acid with a concentration of 4.49mol / L, in which Sc 2 O 3 The content is 13.5mg / L, V 2 O 5 The content is 0.6g / L, TiO 2 The content is 3.9g / L, and 22kg of calcium carbonate is added for one-stage neutralization. The pH value of the reaction end point is 1.0-2.0. 2 O 3 The content is 6.95mg / L, V 2 O 5 The content is 0.31g / L, TiO 2 The content is 2.0g / L. This step Sc 2 O 3 , V 2 O 5 and TiO 2 The recoveries were 87.52%, 87.83% and 87.18%, respectively.

[0040] 2.2kg of calcium carbonate was added to the first-stage neutralization filtrate to carry out the second-stage neutralization. The pH value of the reaction end point was 4.0 to 5.0. After pressure filtration, the second-stage neutralization slag and the second-stage neutralization filtrate were obtained. 2 O 3 The content is 0.0219%, V 2 O 5 The content is 0.98%, TiO 2 The content is 6.3%. The second-stage neutralization filtrate is d...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00C22B34/12C22B34/22C02F1/66C02F103/34
CPCY02P10/20
Inventor 詹海鸿郭旦奇李赋屏何航军陈克勤梁焕龙樊艳金柯剑华罗思强凌振章黄泰元张湘玉满露梅刘泽黎宏鹏容继何厚华张建飞
Owner 广西冶金研究院有限公司
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