PROCESS FOR PURIFYING GALLIUM SOLUTION

摘要

PROBLEM TO BE SOLVED: To provide a simple process for removing or reducing impurities to obtain a desired metal from a used electrolyte containing the desired metal which was used in electrolysis of a metal.

SOLUTION: In the process for purifying the gallium solution, the liquid which was used for electrolysis is cooled and stirred to achieve a high flow rate of the liquid inside a tank to inhibit crystal growth and deposit a crystal containing the impurities for obtaining the desired metal (e.g. gallium) in the residual liquid. The process for purifying the gallium solution comprises a step wherein the alkaline solution containing gallium and a group 5 metal is stirred and cooled and a step wherein solid-liquid separation is performed to separate the solid containing the group 5 metal and the residual liquid containing gallium. The process further comprises a step wherein another solid-liquid separation is performed after adding a calcium salt to the residual liquid after the first solid-liquid separation to remove or reduce other metals.

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