Method for recycling copper indium gallium selenide from copper indium gallium selenide solar thin film battery waste

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

Active Publication Date: 2019-09-10
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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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 recycling copper indium gallium selenide from copper indium gallium selenide solar thin film battery waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, the implementation steps of this embodiment include: taking 50g of crushed and finely ground CIGS waste, adding 98% concentrated sulfuric acid with a mass fraction of 100kg / t-waste, and then performing sulfation roasting at a roasting temperature of The calcined material was obtained at 300°C and the calcining time was 2h, and crude selenium was separated from it. The purity of the crude selenium was 98.2%. The roasting material from which crude selenium is separated is subjected to water leaching under normal pressure. The leaching temperature is 50℃, the leaching time is 2h, the leaching liquid-solid ratio is 3:1ml / g, and the stirring speed is 400rpm to obtain the water leaching and water leaching. Scum. The water immersion liquid is purified and crystallized to obtain copper sulfate products. The water leaching residue is washed, the washing liquid is returned to the water leaching process, and then the water leaching residue is alkali lea...

Embodiment 2

[0044] The implementation steps of this embodiment include: taking 50g of crushed and finely ground CIGS waste, adding 98% concentrated sulfuric acid, the use amount of concentrated sulfuric acid is 700kg / t-waste, and then performing sulfation roasting at a roasting temperature of 200°C. The roasting time is 5h, so as to obtain the roasted material, from which crude selenium is separated, and the purity of crude selenium is 98.6%. The roasting material from which crude selenium is separated is subjected to water leaching under normal pressure, the leaching temperature is 20°C, the leaching time is 6h, the leaching liquid-to-solid ratio is 1:1ml / g, and the stirring speed is 200rpm to obtain the leaching liquid and the leaching residue. Purification / crystallization treatment of the leachate obtained by water leaching can obtain copper sulfate product. The water leaching residue is washed, the washing liquid is returned to the water leaching process, and then the water leaching re...

Embodiment 3

[0046] The implementation steps of this embodiment include: taking 50g of crushed and finely ground CIGS waste, adding 98% of concentrated sulfuric acid, the usage amount of concentrated sulfuric acid is 600kg / t-waste, and then performing sulfation roasting at 700°C. The roasting time is 0.5h, so as to obtain the roasted material, from which crude selenium is separated. The crude selenium purity is 99.1%. The roasted material after the crude selenium has been separated is leached in water under normal pressure. The leaching temperature is 20℃, the leaching time is 6h, the leaching liquid-to-solid ratio is 10:1ml / g, and the stirring speed is 200rpm to obtain the water immersion and water. Leaching residue. The water immersion liquid is purified and crystallized to obtain copper sulfate products. The water leaching residue is washed, and the washing liquid is returned to the water leaching process, and then the water leaching residue is subjected to atmospheric alkaline leaching...

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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 secondary utilization of resources, in particular to a method for recovering copper indium gallium selenium from copper indium gallium selenium solar thin film battery waste. 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 responding to energy crises and protecting the environment. At present, monocrystalline silicon, polycrystalline silicon and amorphous silicon silicon solar cells occupy an unshakable position in the field of solar cells, and compound semiconductor solar cells have also been continuously developed. Among the many types of solar cells, copper indium gallium selenium (CIGS) thin-film solar cells have emerged in the field of solar cells with stable performance, high conversion efficiency, stability and broad application prospects. As a rookie in the field of solar cells, CIGS thi...

Claims

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Application Information

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Patent Type & Authority Patents(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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