Method for recovering valuable metals from waste chips of copper indium gallium selenide solar thin film batteries

Abstract

The invention provides a method for recovering valuable metal from copper indium gallium selenium solar film battery waste chips, and belongs to the technical field of secondary utilization of resources. The method performs the substrate stripping on the copper indium gallium selenium (CIGS) solar film battery waste chips; stripped valuable metal layers are dipped in ammonia to obtain ammonia dipping liquid and ammonia dipping slag through liquid-solid separation after dipping; the ammonia dipping liquid is extracted and electrodeposited to obtain electrolytic copper; the ammonia dipping slagis dipped in alkali to obtain alkali dipping liquid and alkali dipping slag through liquid-solid separation after dipping; the alkali dipping slag is dipped in acid to obtain acid dipping liquid and acid dipping slag; the acid dipping slag is returned to dip in the ammonia; SO2 is introduced in the acid dipping liquid for reduction to obtain rough selenium with a purity of higher than 98%; filtrate is obtained after filtration; the filtrate is reduced and purified to obtain high-purity indium; the alkali dipping liquid is decontaminated to obtain slag containing molybdenum and tin and filtrate; the filtrate is electrolyzed to obtain rough gallium; and the rough gallium is purified to obtain high-purity gallium. The method can realize high-efficiency selective leaching of copper, indium, gallium and selenium, and achieves excellent 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 waste chips of copper indium gallium selenium solar thin film batteries. Background technique [0002] CIGS 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 CIGS waste will be generated, such as CIGS targets that cannot be fully utilized, defective CIGS batteries, etc. In addition to the heavy metal copper, these wastes also contain rare metals such as indium, gallium and selenium. In order to benefit the sustainable utilization of rare metals such as indium, gallium and selenium and heavy metal copper, they need to be separated and recycled separately to facilitate further recycling and ensure the sustainable development of CIGS thin film solar...

AI Technical Summary

Problems solved by technology

However, the leaching rate of metals in this method is not high. Dissolving CIGS waste with hydrochloric acid and hydrogen peroxide is likely to produce toxic gases such as hydrogen chloride and chlorine that pollute the environment. The reaction process is also very intense, and the hydrazine hydrate used for reducing selenium is also highly toxic. More dangerous and prone to environmental pollution

[0007] 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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