Recycling method for copper-indium-gallium-selenium materials

Abstract

The invention discloses a recycling method for copper-indium-gallium-selenium materials. The recycling method mainly comprises the steps of performing sulfurization roasting, performing acid dissolution, extracting and electrolyzing metal copper, producing gallium hydroxide precipitates, replacing indium and the like. According to the recycling method for the copper-indium-gallium-selenium materials disclosed by the invention, sulfurization roasting is adopted to remove selenium, and roasted residual slag is oxidation slag which can be directly subjected to acid dissolution, so that acid gas pollution is reduced; a copper extracting agent is adopted to extract copper, so that the separating effect is good and cost is low, and extracted copper is directly electrolyzed to obtain high-purity metal copper; on the other hand, alkali gallium separation is adopted, so that indium-gallium separation can be realized by only needing to regulate the pH value of the solution, and therefore, the co-extraction problem during extraction and separation of indium and gallium is solved, and the separating effect is good; and the obtained indium and gallium products are relatively high in purity.

Description

technical field [0001] The invention relates to a method for recycling copper indium gallium selenide photovoltaic components, in particular to a method for recycling copper indium gallium selenide materials. Background technique [0002] Copper indium gallium selenide thin film solar cells have many advantages and are favored by the market. It is the biggest hotspot in the research and development, scale production and application of thin film solar cells in recent years. The absorption layer of copper indium gallium selenium solar cells is composed of copper, indium, gallium, and selenium in an optimal ratio to form a chalcopyrite structure, which can absorb a wide range of spectral wavelengths, except for the visible spectral range where amorphous silicon solar cells can absorb light , and can also cover the near-infrared region with a wavelength between 700 and 2000nm, that is, the longest power generation time in a day. Compared with crystalline silicon solar cells of t...

AI Technical Summary

Problems solved by technology

[0007] In the above-mentioned prior art techniques, the use of hydrochloric acid and hydrogen peroxide leaching will consume a large amount of oxidant, and hydrochloric acid is volatile, and it is an exothermic reaction in the leaching reaction process, causing a large amount of hydrochloric acid to volatilize, and the pollution is relatively serious

At the same time, the extraction agent used in the extraction of indium produces co-extraction of gallium, which makes it difficult to separate indium and gallium, thereby reducing the recovery rate of gallium.

On the other hand, the processing method of replacing copper with indium is too expensive to produce.

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