Method for recovering valuable metals from waste copper indium gallium selenide battery chips

Abstract

The invention provides a method for recovering valuable metals from a copper indium gallium selenium waste battery chip, and belongs to the technical field of resource secondary utilization. The method comprises the steps that the copper indium gallium selenium (CIGS) waste battery chip undergoes substrate stripping, and a stripped valuable metal layer is electrically dissolved to obtain a mixed solution; the organic phase and the water phase are separated through extraction of the mixed solution; the organic phase undergoes back extraction and electrodeposition to obtain cathode copper; SO2 is introduced into the water phase to reduce selenium, and filtering is carried out to obtain a first filtrate; the first filtrate undergoes impurity removing / separating to obtain slag and a second filtrate which contain zinc, cadmium, molybdenum, aluminum and tin; the second filtrate undergoes neutralizing and precipitating to obtain a neutralization precipitation solution and neutralization precipitation slag; the neutralization precipitation solution is reduced to obtain crude indium, and the crude indium is refined to obtain high-purity indium; the neutralization precipitation slag undergoes alkaline leaching, and the alkaline leached slag returns for neutralization and precipitation; and a alkaline leached solution undergoes electrolyzing to obtain crude gallium and an electrolytic barren solution, the crude gallium is refined to obtain high-purity gallium, and the electrolytic barren solution returns for alkaline leaching. According to the method, high-efficiency selective leaching of copper, indium, gallium and selenium can be realized, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of resource secondary utilization, in particular to a method for recovering valuable metals from copper indium gallium selenium waste battery chips. Background technique [0002] CIGS thin-film solar cells are low in cost, stable in performance, soft and portable, good in light transmission, strong in applicability, high in photoelectric efficiency, and can be designed into any size and power. Its application range is getting wider and wider, and it has good development potential. [0003] Its production methods include vacuum sputtering method, distillation method and non-vacuum coating method. No matter which production method is used, some copper indium gallium selenide waste will be generated during the production process. From the perspective of green economy, environmental protection and sustainable development, in order to facilitate the sustainable utilization of rare metals such as indium, gallium ...

AI Technical Summary

Problems solved by technology

The process of this method is long, and the hydrazine hydrate used for reducing selenium is also highly toxic, the operation process is dangerous, and it is easy to cause environmental pollution.

[0008] To sum up, it can be seen that there are problems such as low comprehensive recovery rate, incomplete separation, complicated and dangerous operation, high production cost, and large environmental pollution in the existing copper indium gallium selenium waste recycling method. It is urgent to invent a CIGS that can solve the above problems. Waste Chip Recycling Method

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