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Method for recycling gallium, indium and germanium from wasted thin-film solar cells

A technology for solar cells and thin films, applied in the field of recycling gallium, indium, and germanium, can solve the problems of inhibiting the recycling of waste thin-film solar cells, low efficiency, complicated processes, etc., and achieve the effects of reducing recycling costs, improving recycling efficiency, and simple process.

Active Publication Date: 2013-07-10
GEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of using waste thin film solar cells to recycle metals is complex and can only recycle a single metal element, resulting in high recycling costs and low efficiency, which seriously inhibits the technological development of recycling waste thin film solar cells

Method used

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  • Method for recycling gallium, indium and germanium from wasted thin-film solar cells

Examples

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Effect test

Embodiment 1

[0053] A method for reclaiming gallium, indium and germanium from waste thin film solar cells, the specific steps are as follows:

[0054] Step S11. Obtain the first separation liquid containing gallium, indium, germanium, cadmium, copper, tin, zinc metal ions:

[0055] Add the pulverized waste thin-film solar cell powder with a particle size of 0.5 to 1 mm into a mixed solution of sulfuric acid and nitric acid containing an oxidizing agent, stir at a speed of 100 r / min and react at 80°C for 6 hours, then perform solid-liquid separation, and collect gallium-containing , indium, germanium, cadmium, copper, tin, the first separation liquid of zinc metal ion; Wherein, in the mixed solution of sulfuric acid and nitric acid, hydrogen ion concentration is 1mol / L, and the molar ratio of sulfuric acid and nitric acid is 1: 0.4, The solid-to-liquid ratio of the mixed solution of waste thin-film solar cell powder and sulfuric acid and nitric acid is 1g: 2ml; Oxidant is sodium chlorate, ...

Embodiment 2

[0069] A method for reclaiming gallium, indium and germanium from waste thin film solar cells, the specific steps are as follows:

[0070] Step S21. Obtain the first separation liquid containing gallium, indium, germanium, cadmium, copper, tin, zinc metal ions:

[0071] This step is referring to step S11 among the embodiment 1, difference is: the rotating speed of stirring is 60r / min, and the temperature of reaction is 60 ℃, and the reaction time is 10 hours; The hydrogen ion concentration in the mixed solution of sulfuric acid and nitric acid is 0.7mol / L, the molar ratio of sulfuric acid and nitric acid is 1: 0.3, the solid-liquid ratio of the mixed solution of waste thin film solar cell powder and sulfuric acid and nitric acid is 1g: 1ml; Oxidant is hydrogen peroxide, and its quality is the mass of thin film solar cell powder 0.1 times;

[0072] Step S22. Obtaining the second separating liquid:

[0073] This step refers to step S12 in Example 1, the difference is: the pH ...

Embodiment 3

[0086] A method for reclaiming gallium, indium and germanium from waste thin film solar cells, the specific steps are as follows:

[0087] Step S31. Obtain the first separation liquid containing gallium, indium, germanium, cadmium, copper, tin, zinc metal ions:

[0088] This step is referring to step S11 among the embodiment 1, difference is: the rotating speed of stirring is 200r / min, and the temperature of reaction is 99 ℃, and the reaction time is 3 hours; The hydrogen ion concentration in the mixed solution of sulfuric acid and nitric acid is 0.5mol / L, the molar ratio of sulfuric acid and nitric acid is 1: 0.6, the solid-to-liquid ratio of waste thin film solar cell powder and the mixed solution of sulfuric acid and nitric acid is 1g: 3ml; Oxidant is potassium permanganate, and its quality is thin film solar cell 0.1 times the mass of the powder;

[0089] Step S32. Obtaining the second separating liquid:

[0090] Refer to step S12 in Example 1 for this step, the differe...

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Abstract

The invention provides a method for recycling gallium, indium and germanium from wasted thin-film solar cells. The method includes the steps: obtaining first separation liquid containing metal ions of the gallium, the indium, the germanium, cadmium, copper, tin and zinc; obtaining second separation liquid; obtaining filter residues containing the gallium, the indium, the germanium and the tin; obtaining fourth separation liquid and an indium and germanium metal solid which is not dissolved in a lye solution; conducting the steps of recycling gallium metal; conducting the steps of recycling indium metal; and conducting the steps of recycling germanium metal. According to the method for recycling the gallium, the indium and the germanium from the wasted thin-film solar cells, various dissipated metal such as the gallium, the indium and the germanium can be respectively recycled step by step, recycling cost can be effectively reduced, the recycling efficiency is improved, and the method is simple in process and is suitable for industrial production. In addition, through the method for recycling the gallium, the indium and the germanium from the wasted thin-film solar cells, the various dissipated metal such as the gallium, the indium and the germanium is high in purity, and the purity can reach up to 99.99%.

Description

technical field [0001] The invention relates to a method for recovering gallium, indium and germanium from waste thin film solar cells. Background technique [0002] Thin-film solar cell is a kind of solar cell. Its main components are silicon dioxide, aluminum, silicon, polymer, zinc, and also contain some heavy metals such as arsenic and cadmium and scattered metals such as gallium, indium and germanium. Due to its good flexibility, the thin-film solar cell can be combined with buildings or become a part of the building body. It is widely used and has a large annual output, but there are also many waste thin-film solar cells every year. If the The waste thin-film solar cells are directly discarded, and the scattered metals such as gallium, indium, germanium and toxic elements such as arsenic and cadmium contained therein will cause harm to the environment and are a waste of resources. In particular, the non-renewability of gallium, indium, and germanium scattered metals m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCY02P70/50Y02W30/82
Inventor 王勤何显达苏陶贵张翔
Owner GEM CO LTD
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