Method for recovering valuable metals from CIGS solar thin-film battery chamber waste

A solar thin film, copper indium gallium selenide technology, applied in the field of secondary utilization of resources, can solve the problems of high production cost, complicated and dangerous operation, incomplete separation, etc., achieve high-efficiency selective leaching, simple process flow, and meet environmental protection requirements Effect

Active Publication Date: 2019-11-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.
[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 recycling method

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  • Method for recovering valuable metals from CIGS solar thin-film battery chamber waste

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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, a method for recovering valuable metals from CIGS solar thin film cell chamber waste, comprising: taking 50g CIGS solar thin film cell chamber waste as an anode, under the effect of DC power supply, controlling the voltage of the electrolyzer to be 1.5V, Under the acidic condition of 300g / L sulfuric acid, all the chamber wastes were dissolved. Pass SO into the dissolved mixture 2 , the flux is SO 2The ratio of the amount of the substance to the amount of the Se substance in the raw material is 1.1mol / mol, which can be reduced to obtain crude selenium with a purity greater than 98%; the filtrate obtained after filtering the selenium is extracted with a copper extractant, and the organic phase and the liquid phase are separated after extraction. liquid separation; the organic phase is subjected to back extraction and electrodeposition to obtain cathode copper; a certain concentration of NaOH solution is added to the water phase to neutralize a...

Embodiment 2

[0044] A method for recovering valuable metals from CIGS solar thin film cell chamber waste, comprising: taking 100g CIGS solar thin film cell chamber waste as an anode, under the effect of DC power supply, controlling the electrolyzer voltage to be 3.0V, at 50g / The acidic condition of L sulfuric acid completely dissolves the chamber waste. SO in the dissolved mixture 2 , the flux is SO 2 The ratio of the amount of the substance to the amount of the Se substance in the raw material is 1.5mol / mol, which can be reduced to obtain crude selenium with a purity greater than 98%; the filtrate obtained after filtering the selenium is extracted with a copper extractant, and the organic phase and the liquid phase are separated after extraction. Liquid separation; the organic phase can be obtained by back-extraction and electrodeposition; the cathode copper can be obtained by adding a certain concentration of KOH solution to the aqueous phase for neutralization and precipitation to obt...

Embodiment 3

[0046] A method for recovering valuable metals from CIGS solar thin film cell chamber waste, comprising: taking 50g CIGS solar thin film cell chamber waste as an anode, under the effect of DC power supply, controlling the electrolyzer voltage to be 2.5V, at 150g / The acidic condition of L sulfuric acid completely dissolves the chamber waste. Pass SO into the dissolved mixture 2 , the flux is SO 2 The ratio of the amount of the substance to the amount of the Se substance in the raw material is 1.1mol / mol, which can be reduced to obtain crude selenium with a purity greater than 98%; after selenium precipitation, the filtrate obtained by filtering is extracted with an extraction agent, and the organic phase and the liquid phase are separated after extraction Separation; cathode copper can be obtained by stripping the organic phase and electrowinning; adding a certain concentration of Na to the aqueous phase 2 CO 3 The hydroxides of gallium and indium are obtained by neutraliza...

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Abstract

The invention provides a method for recycling valuable metals from copper-indium-gallium-selenium solar film cell chamber waste materials, and belongs to the technical field of secondary utilization of resources. The method comprises the steps that the copper-indium-gallium-selenium (CIGS) solar film cell waste materials are electrically dissolved; crude selenium can be obtained by introducing SO2into mixed liquid obtained after electrical dissolution, filtering is conducted after selenium sedimentation is completed, and filtrate is obtained; an organic phase and an aqueous phase of the filtrate are separated through extraction and separation liquid; cathode copper is obtained after reverse extraction and electrodeposition are conducted on the organic phase; aqueous phase neutralization and sedimentation are conducted to obtain hydroxides of gallium and indium; the hydroxides are roasted to obtain oxides; and high-purity gallium-indium metal mixtures are obtained after the oxides of gallium and indium are subjected to reduction smelting and purified. According to the method, a novel technology thought is provided for comprehensively recycling copper, indium, gallium and selenium in the CIGS solar film cell chamber waste materials, the recycling rates of the four valuable elements all can reach 96% or above, efficient selective leaching of copper, indium, gallium and selenium is achieved, 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 waste materials of copper indium gallium selenium solar thin film battery chambers. Background technique [0002] Low-carbon environmental protection is the only way for the sustainable development of human beings. In order to achieve this goal, it is necessary to develop new energy sources to replace existing traditional fossil energy sources. Solar photovoltaic power generation occupies an important place in new energy; thin-film solar cells have become the development trend of the photovoltaic industry; and copper indium gallium selenide (CIGS) thin-film solar cells are currently the thin-film solar cells with the highest photoelectric conversion efficiency. CIGS was chosen as the absorber layer for high-efficiency solar cells due to its many advantages. First, by adjusting the content of Ga, the forbidden ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B58/00
CPCC22B7/001C22B7/006C22B15/0026C22B15/0063C22B58/00Y02P10/20
Inventor 马保中王成彦陈永强邢鹏雷蒙恩
Owner UNIV OF SCI & TECH BEIJING
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