Method for recycling copper, indium and gallium from waste copper-indium-gallium target

Abstract

The invention relates to a method for recycling copper, indium and gallium from a waste copper-indium-gallium target. The method comprises the following steps that copper, indium and gallium are dissolved in acid to be in corresponding ionic states; then neutralization and sedimentation are performed to form corresponding hydroxides; then, a concentrated NaOH solution is used for separation to remove gallium, a simple substance of gallium is electrolyzed and recycled, and a water electrolyte containing NaOH generated in the electrolytic process is used for secondary gallium separation; the copper hydroxide and the indium hydroxide are dissolved in acid again, a kerosene solution of di(2-ethylhexyl phosphoric acid) is used for extracting In3+ into an organic phase, and Cu2+ is still in the water phase; iron power is used for replacing a simple substance of copper from the water phase containing Cu2+; and concentrated hydrochloric acid is used for reversely extracting In3+ into the water phase, and then aluminum powder is used for replacement to obtain a simple substance of indium. According to the method, the copper recycling rate is not smaller than 97.1%, the indium recycling rate is not smaller than 97.3%, and the gallium recycling rate is not smaller than 97.9%, so that operation is easy and convenient, and the cost is low.

Description

Technical field

[0001] The invention belongs to the field of copper indium gallium (CIG) waste target recycling. Background technique

[0002] Copper Indium Gallium Selenide (CIGS) solar thin-film solar cells are currently internationally recognized as the cheapest next-generation solar cells. In the process of producing CIGS batteries, a large amount of waste copper indium gallium (CIG) targets will be produced. CIG waste target materials mainly contain three metals: copper, indium and gallium, which are all valuable metals, especially indium and gallium are rare and precious metals. As a renewable resource, the comprehensive recycling and utilization of CIG waste targets have high economic value and social significance.

[0003] "Modern Metallurgy" 2010 06 issue Wang Yang, Hu Dawei, Huang Xingdeng, etc. proposed that the waste copper indium gallium target powder was dissolved in concentrated hydrochloric acid, organic phase extraction, stepwise precipitation and separation of c...

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