Process for recovering gallium form gallium-purifying waste liquid

A waste liquid, electrolytic recovery technology, applied in the direction of process efficiency improvement, photographic process, instruments, etc., to achieve the effect of simplifying the production process, improving the current efficiency, and cheap operation

Active Publication Date: 2010-12-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the above prior art, to provide a method that can effectively solve the problem of gallium recovery in various waste liquids in the purification process, and does not introduce new impurities, so that the concentration of gallium ions in the waste liquid after enrichment can be reduced. Method for recovering gallium from waste liquid of gallium purification up to 2g / L

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  • Process for recovering gallium form gallium-purifying waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Filter the gallium-containing waste liquid to be treated to remove the black scum and oxide film in the solution.

[0022] (2) Mix the filtrates with different pH values, wherein the gallium ions are converted into hydroxides, and a white precipitate appears in the solution, and the pH value of the solution is adjusted to 6.5 while stirring, so that the gallium ions are completely converted into gallium hydroxides.

[0023] (3) Leave the prepared solution to stand for 3 hours, remove the supernatant, and save the precipitate.

[0024] (4) Add solid sodium hydroxide to the precipitation slurry, adjust the caustic alkali concentration to 120g / L, dissolve the precipitate at about 90°C, and prepare a recovery solution.

[0025] (5) Slowly add the prepared solution into the recovery tank, connect the electrodes, and prepare for electrolysis.

[0026] (4) Turn on the DC power supply and control the cathode current density to 1000A / m 2 , start electrolysis, and the tempe...

Embodiment 2

[0029] (1) Filter the gallium-containing waste liquid to be treated to remove the black scum and oxide film in the solution.

[0030] (2) Mix the filtrates with different pH values, wherein the gallium ions are converted into hydroxides, and a white precipitate appears in the solution, and the pH value of the solution is adjusted to 6.4 while stirring, so that the gallium ions are completely converted into gallium hydroxides.

[0031] (3) Leave the prepared solution to stand for 4 hours, remove the supernatant, and save the precipitate.

[0032] (4) Add solid sodium hydroxide to the precipitation slurry, adjust the caustic alkali concentration to 130g / L, dissolve the precipitate at about 95°C, and prepare a recovery solution.

[0033] (5) Slowly add the prepared solution into the recovery tank, connect the electrodes, and prepare for electrolysis.

[0034] (4) Turn on the DC power supply and control the cathode current density to 1200A / m 2 , start electrolysis, and the tempe...

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Abstract

Disclosed is a method of recovering gallium from a liquid waste of gallium purification, relating to a method of recovering the liquid waste containing gallium produced in a purification process of gallium, which is characterized in that a recovery process comprising steps as follows: firstly, the liquid waste is filtered to remove black dross and a passivated film, then the liquid waste is neutralized and a pH value of the neutralized solution is controlled in order to form precipitation of gallium, which is then laid aside, the supernatant is removed and the subsided slurry is separated; secondly, the precipitated slurry is added with solid base to dissolve the slurry, and the slurry solution is electrolyzed to recover the gallium. The method on one hand can realize the recovery of active ingredients through enrichment of active ingredients from the liquid waste, and at the same time address a discharge problem of liquid waste so as to achieve an effect of wastewater treatment by waste liquid; on the other hand the method can make use of an electrolysis device of gallium purification instead of specially installing a recovery device of liquid-waste gallium, and has advantages ofsimple operation, low cost, simplifying production process and improving production efficiency.

Description

technical field [0001] The invention discloses a method for recovering gallium from gallium-purified waste liquid, which relates to a method for recovering gallium-containing waste liquid produced in the process of gallium purification. Background technique [0002] High-purity gallium is made of crude gallium as a raw material, which is comprehensively purified by various purification methods such as chemical extraction, electrolytic refining, regional smelting, and single crystal pulling. Impurities are extracted or the surface of rough gallium is protected with acidic or alkaline solutions to prevent the surface of liquid gallium from being oxidized in contact with air, resulting in a large amount of acid-base waste liquid containing gallium. The source of the waste liquid has the following aspects: First, the impurities in the crude gallium are removed by chemical extraction to produce a certain gallium-containing waste liquid. Extraction method is currently a commonly ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22B58/00C25C1/22
CPCY02P10/20
Inventor刘彩玫程涛张学英常晖刘静丽
OwnerGUIZHOU BRANCH CHINA ALUMINUM IND