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Method for recovering copper indium gallium selenium from waste of copper indium gallium selenium solar thin film cell

A solar thin film, copper indium gallium selenide technology, applied in the field of secondary resource utilization, can solve the problems of complex operation process, incomplete separation, long process, etc., and achieve the effect of simple process flow, meeting environmental protection requirements, and low equipment investment

Active Publication Date: 2018-08-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of this method is long, the two-electrode electrolysis process is difficult to control, the oxidation distillation separation is not complete, the recovery rate of selenium is low, and the final product is only a metal compound, which requires further processing to obtain rare metals. At the same time, the applicability of the method is limited and cannot Solving Gallium Recycling Problems
[0008] To sum up, there are problems such as low comprehensive recovery rate, incomplete separation, complicated operation process, high production cost, and heavy 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 Chamber Waste Recycling Methods

Method used

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  • Method for recovering copper indium gallium selenium from waste of copper indium gallium selenium solar thin film cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1As shown, the implementation steps of this embodiment include: taking 50 g of crushed and finely ground CIGS waste, adding concentrated sulfuric acid with a mass fraction of 98%, the consumption of concentrated sulfuric acid is 100 kg / t-waste, and then performing sulfation roasting at a roasting temperature of 300° C., and the roasting time is 2 hours, so as to obtain the roasted material, and separate crude selenium from it, and the purity of the crude selenium is 98.2%. Under normal pressure, the roasted material from which crude selenium has been separated is subjected to water immersion, the leaching temperature is 50°C, the leaching time is 2h, the leaching liquid-solid ratio is 3:1ml / g, and the stirring speed is 400rpm, thereby obtaining the water immersion liquid and water immersion scum. Purify and crystallize the water immersion solution to obtain the copper sulfate product. Wash the water leaching slag, return the washing liquid to the water ...

Embodiment 2

[0044] The implementation steps of this embodiment include: take 50 g of crushed and finely ground CIGS waste, add concentrated sulfuric acid with a mass fraction of 98%, the usage of concentrated sulfuric acid is 700 kg / t-waste, and then carry out sulfate roasting, the roasting temperature is 200 ° C, The roasting time is 5 hours, so as to obtain the roasted material, from which crude selenium is separated, and the purity of the crude selenium is 98.6%. The roasted material from which crude selenium has been separated is water-leached under normal pressure, the leaching temperature is 20°C, the leaching time is 6h, the leaching liquid-solid ratio is 1:1ml / g, and the stirring speed is 200rpm, so as to obtain leaching liquid and leaching residue. The leaching solution obtained by water immersion is purified / crystallized to obtain the copper sulfate product. Wash the water leaching slag, return the washing liquid to the water immersion process, and then carry out alkaline leachi...

Embodiment 3

[0046] The implementation steps of this embodiment include: take 50 g of crushed and finely ground CIGS waste, add concentrated sulfuric acid with a mass fraction of 98%, the usage of concentrated sulfuric acid is 600 kg / t-waste, and then carry out sulfate roasting, the roasting temperature is 700 ° C, The roasting time is 0.5h, thereby obtaining the roasted material, from which crude selenium is separated, and the purity of the crude selenium is 99.1%. Under normal pressure, the roasted material after the separation of crude selenium is immersed in water, the leaching temperature is 20°C, the leaching time is 6h, the leaching liquid-solid ratio is 10:1ml / g, and the stirring speed is 200rpm, so as to obtain the water immersion liquid and water Leach residue. Purify and crystallize the water immersion solution to obtain the copper sulfate product. Wash the water leaching slag, return the washing liquid to the water immersion process, and then carry out atmospheric pressure alk...

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Abstract

The invention provides a method for recovering copper indium gallium selenium from waste of a copper indium gallium selenium solar thin film cell, and belongs to the technical field of resource secondary utilization. The method comprises the steps that the waste in a copper indium gallium selenium (CIGS) solar thin film cell chamber is smashed and milled, then is subjected to sulfatizing roastingto obtain crude selenium and roasting materials, the roasting materials are leached by adding water, and a copper sulfate product is obtained by purifying and crystallizing a water leaching solution;water leaching slag is subjected to alkaline leaching, then an alkali leaching solution is electrolyzed, and gallium metal is obtained; inorganic acid is added to alkali leaching slag for acid leaching, and metal indium powder is obtained by reducing and purifying an acidic leaching solution by formaldehyde, hydrazine hydrate, and iron powder or a mixture of two or three of the formaldehyde, the hydrazine hydrate, and the iron powder in any proportion; and acidic leaching slag is returned for sulfatizing roasting. The purity of the obtained crude selenium is larger than 98%, the purity of theobtained metal indium powder is less than 99%, and the purity of the obtained metal gallium is larger than 99%. The recovery rates of four valuable elements are all above 95%. The method for recovering the copper indium gallium selenium from the waste of the copper indium gallium selenium solar thin film cell is simple to operate, high in safety, high in reliability, and low in cost, scale production is easy to achieve, the environmental protection requirements are met, and the application prospects are broad.

Description

technical field [0001] The invention relates to the technical field of resource secondary utilization, in particular to a method for recovering copper indium gallium selenium from waste materials of copper indium gallium selenide solar thin film batteries. Background technique [0002] Solar energy is a new type of clean and renewable energy. The development and utilization of solar energy is of great significance in coping with the energy crisis and protecting the environment. At present, monocrystalline silicon, polycrystalline silicon and amorphous silicon solar cells occupy an unshakable position in the field of solar cells, and compound semiconductor series solar cells have also been continuously developed. Among the many types of solar cells, copper indium gallium selenide (CIGS) thin film solar cells have emerged in the field of solar cells due to their stable performance, high conversion efficiency, stability and broad application prospects. As a newcomer in the fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/06C22B58/00C22B15/00C25C1/22C01B19/02
CPCC01B19/02C22B1/06C22B7/006C22B15/00C22B58/00C25C1/22Y02P10/20Y02P20/133
Inventor 马保中王成彦陈永强邢鹏吕东亚
Owner UNIV OF SCI & TECH BEIJING
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