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Method for preparing scandium oxide by using rough scandium extracted from waste acid water of titanium dioxide as raw material

A technology of titanium dioxide waste acid and water extraction, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of waste of resources, large economic losses, low recovery rate, etc., to reduce the loss and cost of scandium Low, the effect of solving environmental pollution problems

Active Publication Date: 2013-07-10
桃江瑞龙金属新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purity of scandium oxide produced by this method is very high, greater than 99.98%, but its recovery rate is low. For scandium, an expensive rare earth metal, the waste of resources and economic loss caused by it are very large

Method used

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  • Method for preparing scandium oxide by using rough scandium extracted from waste acid water of titanium dioxide as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Sulfuric acid dissolution: 10 kg of crude scandium hydroxide extracted from titanium white waste acid water was used as raw material, and sulfuric acid was added to adjust the pH value of the mixture to 0.5; the solid-to-liquid ratio of the mixture was 1:3 (g / mL); Among them, the use of sulfuric acid has a better effect than the use of hydrochloric acid in the prior art. Specifically, the use of sulfuric acid in this link has a high dissolution rate of scandium, good filtration effect and sulfuric acid is not as volatile as hydrochloric acid, which is conducive to maintaining a better working environment. ;

[0043] 2) Alkali precipitation: the above mixture is separated by pressure filtration, sodium hydroxide is added to the obtained liquid until the pH is 11, precipitation occurs and some impurities easily soluble in strong alkali such as aluminum and silicon are removed, and the product has high purity;

[0044] 3) Hydrochloric acid dissolution: step 2) the obtai...

Embodiment 2

[0051] 1) Sulfuric acid dissolution: 10 kg of crude scandium hydroxide extracted from titanium white waste acid water was used as raw material, and sulfuric acid was added to adjust the pH value of the mixture to 0.1; the solid-to-liquid ratio of the mixture was 1:3 (g / mL);

[0052] 2) Alkali precipitation: the above mixture is separated by pressure filtration, sodium hydroxide is added to the obtained liquid until the pH is 11, precipitation occurs and some impurities easily soluble in strong alkali such as aluminum and silicon are removed, and the product has high purity;

[0053] 3) Hydrochloric acid dissolution: step 2) the obtained precipitate is first washed with water until the pH of the washing solution is 7, and then dissolved with hydrochloric acid to obtain a hydrochloric acid soluble matter until the pH is 0.5;

[0054] 4) Extraction: add dimethyl heptyl phosphate and diesel oil as the organic phase in the hydrochloric acid soluble matter, the volume ratio of the me...

Embodiment 3

[0060] 1) Sulfuric acid dissolution: 10 kg of crude scandium hydroxide extracted from titanium white waste acid water was used as raw material, and sulfuric acid was added to adjust the pH value of the mixture to 0.1; the solid-to-liquid ratio of the mixture was 1:3 (g / mL);

[0061] 2) Alkali precipitation: the above mixture is separated by pressure filtration, sodium hydroxide is added to the obtained liquid until the pH is 11, precipitation occurs and some impurities easily soluble in strong alkali such as aluminum and silicon are removed, and the product has high purity;

[0062] 3) Hydrochloric acid dissolution: step 2) the obtained precipitate is first washed with water until the pH of the washing solution is 7 and then dissolved with hydrochloric acid to obtain a hydrochloric acid soluble matter until the pH is 1.0;

[0063] 4) Extraction: Add dimethylheptyl phosphate and kerosene as the organic phase in the hydrochloric acid soluble matter, the volume ratio of the methyl...

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Abstract

The invention relates to a method for preparing scandium oxide by using rough scandium extracted from the waste acid water of titanium dioxide as a raw material. The method comprises the following steps of: sulfuric acid dissolution, alkali deposition, hydrochloric acid dissolution, extraction, back extraction, oxalic acid deposition and firing. Scandium is recovered from a great deal of waste acid water generated in production of the titanium dioxide by using the method provided by the invention, so that not only is the problem of environment pollution solved, but also the waste materials are changed into things of value, and the expensive and rare scandium element is recovered; the purity of the scandium oxide prepared by the invention can be up to as high as over 99.9%, and the recovery rate of the scandium oxide can be up to as high as 80-90%, so that the loss of scandium is greatly reduced; and in addition, the method provided by the invention is simple in preparation process and lower in cost.

Description

technical field [0001] The invention relates to a method for preparing scandium oxide, in particular to a method for preparing scandium oxide by using rough scandium hydroxide extracted from titanium dioxide production waste acid water as a raw material. Background technique [0002] Scandium is one of the rare earth elements, and its content in nature is very small. The content of scandium in the earth's crust is only 5×10 -6 . However, scandium has a wide range of uses, such as scandium sodium lamps with power saving, long service life, strong fog breaking ability, and good luminous efficiency, solar photovoltaic cells, gamma ray sources, alloy materials, organic chemical additives, etc. Wait. Therefore, scandium is expensive, and its recovery methods are complicated and diverse. There are various methods such as precipitation method and extraction separation method to separate and purify scandium oxide. [0003] The extraction of scandium has been studied a lot since t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/20C01F17/00
Inventor 杨志强俞铁辉
Owner 桃江瑞龙金属新材料有限责任公司
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