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Clarification method for gallium purification electrolysis waste solution

A technology for electrolytic waste liquid and purification treatment, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. It can solve problems such as increased alkali consumption in production, complicated process operation, and increased impurity content. Achieve the effect of reducing alkali consumption, simplifying production process and improving production efficiency

Active Publication Date: 2009-12-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of operation flow, firstly, the process operation is complicated, secondly, it increases the production alkali consumption, and thirdly, stainless steel plates are often used as electrode materials in the recycling process, which is easy to cause the content of impurities in metal gallium, especially Fe impurities, to decrease in the gallium recycling process. Iron is one of the impurities that are difficult to remove in the purification process, which increases the difficulty for the next step of preparation of high-purity gallium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Mix the electrolyte solution to be purified with 60°C high-purity water at a ratio of 2:1, stir evenly and then filter to remove black scum and oxide film in the solution.

[0031] (2) The filtered filtrate is adjusted with high-purity water, Nk118g / L in the adjusted liquid, Ga 3+ 222g / L, keep the solution temperature not lower than 35°C.

[0032] (3) Slowly add the prepared solution into the cylindrical electrolytic cell, insert the insoluble electrodes into the cathode and anode regions respectively, and add 20-30 g of gallium metal into the cathode region.

[0033] (4) Turn on the DC power supply and control the cathode current density to 1250A / m 2 , start electrolysis, and the temperature of the solution is kept at 40-65°C during the electrolysis process.

[0034] (5) Electrolysis was carried out for 96 hours, the electrode was taken out, and the cathode material was released. After the product was washed with water and pickled, the impurity content was analyz...

Embodiment 2

[0037] (1) Mix the electrolyte solution to be purified with 60°C high-purity water at a ratio of 2:1, stir evenly, and then filter to remove black scum and oxide film in the solution.

[0038] (2) Adjust the filtered filtrate with high-purity water, adjust Nk128 / L in the liquid, Ga3+ 222g / L, keep the solution temperature not lower than 35°C.

[0039] (3) Slowly add the prepared solution into the cylindrical electrolytic cell, insert the insoluble electrodes into the cathode and anode regions respectively, and add 20-30 g of gallium metal into the cathode region.

[0040] (4) Turn on the DC power supply and control the cathode current density to 1000A / m 2 , start electrolysis, and the temperature of the solution is kept at 40-65°C during the electrolysis process.

[0041] (5) Electrolysis was carried out for 72 hours, the electrode was taken out, and the cathode material was released. After the product was washed with water and pickled, the impurity content was analyzed, among...

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PUM

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Abstract

The invention relates to a purification treatment method for purifying gallium from waste electrolyte, which is characterized in that the treatment process comprises that: the electrolyte is filtered to remove floating slag and passive film of the electrolyte, the electrolyte to be purified is used as an electrolysis medium to electrolyze an insoluble anode, thus precipitating and eliminating impurities and Ga, and the purified electrolyte can be sent back to be reused. On the one hand, the purification and treatment method for purifying gallium from waste electrolyte can purify the electrolyte by electrolyzing the electrolyte, thus recycling the electrolyte, cutting down alkaline consumption and realizing the closed loop circulation of the electrolyte during the purification process of gallium; on the other hand, a specialized electrolyte recovery device needs not to be set up, thus simplifying the production process and improving the production efficiency.

Description

technical field [0001] The invention relates to a purification treatment method for gallium purified electrolytic waste liquid. Background technique [0002] Gallium is a precious rare metal. More than 90% of gallium in the world is extracted in the process of producing alumina, and the remaining 10% of gallium is mainly recovered and regenerated from zinc smelting residues or other impurities. With the rapid development of microelectronics and optoelectronics industries, people pay more and more attention to gallium metal, and the requirements for its purity and stability are getting higher and higher. More than 80% of the gallium consumption in the world is high-purity gallium and ultra-pure gallium, and more than 95% of Ga is used to prepare GaAs or GaN. The terminal markets are mobile phones, digital cameras, LEDs and semiconductor light sources. [0003] High-purity gallium is made of crude gallium as a raw material, which is comprehensively purified by various purific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461
Inventor 吴钢江新民刘彩玫黄健全玉郭海峰管督
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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