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A method for enriching scandium from titanium dioxide wastewater

A titanium dioxide wastewater, enrichment technology, applied in the direction of improving process efficiency, can solve the problems of wasting titanium dioxide wastewater scandium resources, increasing production costs, etc., to solve scandium loss, reduce production costs, reduce consumption and pollutant discharge. Effect

Active Publication Date: 2019-08-06
CHINALCO GUANGXI NONFERROUS RARE EARTH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the treatment of titanium dioxide wastewater is mainly based on alkali neutralization, and the alkaline substances used mainly include dolomite, limestone, lime, carbide slag, spent alkali, etc., which not only increases the production cost, but also wastes the titanium dioxide wastewater. Scandium resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for enriching scandium from titanium dioxide wastewater, comprising the following steps:

[0028] (1) Primary extraction: 20.41 m of titanium dioxide wastewater 3 , Sc 2 o 3 12.10 mg / L, add the organic phase to the titanium dioxide wastewater for one extraction, the first extraction is a three-stage countercurrent extraction, the ratio is O:A=1:10, and the Sc in the extraction raffinate 2 o 3 0.90 mg / L, the scandium extraction rate is 92.60%, and the Sc in the organic phase is loaded once 2 o 3 326.42 mg / L,;

[0029] (2) One-time back-extraction: One-time back-extraction is carried out with one extraction-loaded organic phase. The operating conditions are O:A = 1:1, the content of sodium hydroxide is 10%, the temperature is 60 ℃, and the time of one-time back-extraction is After 20 min, the organic phase was recovered after the reaction was completed, and the lye was filtered to obtain a back-extraction filter cake, and the lye was recovered, and the pri...

Embodiment 2

[0036] A method for enriching scandium from titanium dioxide wastewater, comprising the following steps:

[0037] (1) Primary extraction: 30.20 m of titanium dioxide wastewater 3 , Sc 2 o 3 11.20 mg / L, add the organic phase to the titanium dioxide wastewater for one extraction, the first extraction is a three-stage countercurrent extraction, the ratio is O:A=1:10, and the Sc in the extraction raffinate 2 o 3 0.93 mg / L, the scandium extraction rate is 91.73%, and the Sc in the organic phase is loaded once 2 o 3 346.5 mg / L,;

[0038] (2) One-time back-extraction: One-time back-extraction is carried out with one-time extraction loaded organic phase. The operating conditions are O:A = 1:1, the content of sodium hydroxide is 10%, the temperature is 70 ℃, and the time of one-time back-extraction is After 20 min, the organic phase was recovered after the reaction was completed, and the lye was filtered to obtain a back-extraction filter cake, and the lye was recovered, and the...

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PUM

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Abstract

The invention discloses a method for enriching scandium from titanium white wastewater. The method comprises the six steps of primary extraction, primary reverse extraction, acid dissolution for impurity removal, secondary extraction, washing for titanium removal and secondary reverse extraction. The method for enriching the scandium from the titanium white wastewater achieves comprehensive scandium recycle, the scandium recovery rate is improved from below 50% to 83% or above, extraction and separation of scandium target element and impurities are achieved, the problems of scandium loss, entrainment, emulsification and the like of a traditional process are effectively solved, the coarse scandium purity is above 36%, organic phase, alkaline liquor and acid liquor can be recycled, chemical raw material consumption and pollutant discharge are reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to a rare earth resource recovery technology, in particular to a method for enriching scandium from titanium white wastewater. Background technique [0002] The rare earth element scandium (Sc) is an important strategic resource. There are basically no independent deposits of metal scandium in nature, and almost all of them are associated deposits. Scandium can be widely used in strong laser crystals, electronics, metal alloys, batteries, lighting and other industries. In recent years, the United States, Japan and other countries have made breakthroughs in the application technology of scandium-zirconium oxide electrolytes in solid oxide fuel cells (SOFC), which has promoted the demand for scandium and scandium-zirconium powders. [0003] The production of titanium dioxide by the sulfuric acid method will produce a large amount of acidic wastewater. According to statistics, every 1 ton of titanium dioxide produced can produce 40-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B7/00
CPCC22B7/006C22B59/00Y02P10/20
Inventor 胡振光胡谷华黄华勇张亮玖韦世强谭海翔彭新林卢阶主
Owner CHINALCO GUANGXI NONFERROUS RARE EARTH DEV CO LTD
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