Recycling method for copper indium gallium selenide (CIGS) waste

Abstract

The invention relates to a recycling method for copper indium gallium selenide (CIGS) waste. The recycling method comprises the steps that selenium in the CIGS waste is subjected to acidifying, roasting and volatilizing at first, SeO2 gas is reduced through a sodium sulfite solution, and crude selenium is obtained to achieve advance separation of the selenium, so that the problem that the selenium is always difficult to separate in the industry is solved; and then, the rest of three kinds of metal are separated, particularly, gallium-containing alkali liquor produced in the indium separation process and a gallium-containing solution obtained in the gallium separation process are combined, and electrodepositing residual liquor can be returned to the to-be-electrodeposited gallium-containing solution to be subjected to circulatory electrodepositing, so that efficient and circulatory recycling of gallium is achieved. According to the recycling scheme of the recycling method for the CIGS waste, the comprehensive recycling rate of the various materials is much higher than the existing level in the same industry; in addition, production wastewater zero discharge can be achieved in the whole recycling process, and the environment-friendly degree is high; and moreover, the whole recycling process is easy to operate, high in safety and reliability, low in cost and capable of achieving large-scale production easily and has broad application prospects.

Description

technical field [0001] The invention relates to the field of metal-nonmetal mixed waste recycling, in particular to a method for recycling copper indium gallium selenide (CIGS) waste. Background technique [0002] Copper indium gallium selenide (CIGS for short) solar thin film battery has the characteristics of low cost, convenient installation and wide application range, and its application prospect is very broad. In the process of producing CIGS batteries, a large amount of copper indium gallium selenide (CIGS for short) waste will be produced, such as CIGS targets that cannot be fully utilized, defective CIGS batteries, etc.; at the same time, with the widespread use of CIGS batteries, they are also facing scrapping The issue of recycling of CIGS battery components. [0003] CIGS waste mainly contains copper, indium, gallium, and selenium, which are all valuable materials. Among them, indium, gallium, and selenium are important strategic resources, and copper is an urgen...

AI Technical Summary

Problems solved by technology

However, this technical solution faces the same problems of environmental pollution and operational danger as the aforementioned Chinese patent 102296178A. In addition, reducing selenium with sodium sulfite in an acidic environment is likely to produce chlorine dioxide gas, which is harmful to the human body and the reduction is not complete, resulting in the recovery rate of selenium. low, and the residual selenium will affect the subsequent recovery of indium and gallium, all of which show that the separation strategy of the patented method is not very reasonable

[0007] To sum up, there are problems such as low comprehensive recovery rate, incomplete separation, complicated and dangerous operation, high production cost, and large environmental pollution in the recycling method of copper indium gallium selenium waste in the prior art. It is urgent to invent a method that can solve the above problems. CIGS Waste Recycling Methods

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