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Method for recycling copper, indium and gallium from waste copper-indium-gallium target

A technology of copper indium gallium and copper recovery, which is applied in the direction of improving process efficiency, etc., can solve the problems of large environmental pollution, complicated operation, and high production cost

Active Publication Date: 2015-11-25
北京大昱光伏科技有限公司
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  • Abstract
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Problems solved by technology

[0007] Therefore, the copper indium gallium waste target recovery method in the prior art has problems such as low comprehensive recovery rate, incomplete separation, complicated operation, high production cost, and large environmental pollution. In order to solve the above problems, the present invention is proposed

Method used

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  • Method for recycling copper, indium and gallium from waste copper-indium-gallium target

Examples

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Embodiment

[0049] The examples are merely illustrative and not restrictive.

[0050] Step a: Use a ball mill to grind the waste copper indium gallium target into powder with a particle size of about 90 mesh.

[0051] Step b: Mix the powder with water and 98% concentrated sulfuric acid, dissolve the powder under the action of the concentrated sulfuric acid dilution and exothermic heat, add nitric acid or nitrate solution in the later stage of dissolution and heat to above 95°C, continue the reaction until the powder completely dissolved. The weight ratio between CIG powder and concentrated sulfuric acid in this step is 1:2, and the weight ratio between CIG powder and water is 1:1. The above heating is carried out by passing industrial waste steam into the reactor jacket. After dissolution, copper, indium, and gallium are respectively in the form of ions, namely Cu 2+ , In 3+ , Ga 3+ The form exists in solution.

[0052] Step c: Add ammonia water to the mixture obtained in step b, and neutrali...

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Abstract

The invention relates to a method for recycling copper, indium and gallium from a waste copper-indium-gallium target. The method comprises the following steps that copper, indium and gallium are dissolved in acid to be in corresponding ionic states; then neutralization and sedimentation are performed to form corresponding hydroxides; then, a concentrated NaOH solution is used for separation to remove gallium, a simple substance of gallium is electrolyzed and recycled, and a water electrolyte containing NaOH generated in the electrolytic process is used for secondary gallium separation; the copper hydroxide and the indium hydroxide are dissolved in acid again, a kerosene solution of di(2-ethylhexyl phosphoric acid) is used for extracting In3+ into an organic phase, and Cu2+ is still in the water phase; iron power is used for replacing a simple substance of copper from the water phase containing Cu2+; and concentrated hydrochloric acid is used for reversely extracting In3+ into the water phase, and then aluminum powder is used for replacement to obtain a simple substance of indium. According to the method, the copper recycling rate is not smaller than 97.1%, the indium recycling rate is not smaller than 97.3%, and the gallium recycling rate is not smaller than 97.9%, so that operation is easy and convenient, and the cost is low.

Description

Technical field [0001] The invention belongs to the field of copper indium gallium (CIG) waste target recycling. Background technique [0002] Copper Indium Gallium Selenide (CIGS) solar thin-film solar cells are currently internationally recognized as the cheapest next-generation solar cells. In the process of producing CIGS batteries, a large amount of waste copper indium gallium (CIG) targets will be produced. CIG waste target materials mainly contain three metals: copper, indium and gallium, which are all valuable metals, especially indium and gallium are rare and precious metals. As a renewable resource, the comprehensive recycling and utilization of CIG waste targets have high economic value and social significance. [0003] "Modern Metallurgy" 2010 06 issue Wang Yang, Hu Dawei, Huang Xingdeng, etc. proposed that the waste copper indium gallium target powder was dissolved in concentrated hydrochloric acid, organic phase extraction, stepwise precipitation and separation of c...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B58/00
CPCY02P10/20
Inventor 张发杨武斌
Owner 北京大昱光伏科技有限公司
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