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Method for recycling silver of waste solar cell panel

A technology of solar panels and panels, applied in chemical instruments and methods, improvement of process efficiency, inorganic chemistry, etc., can solve problems such as the impact of wastewater treatment, and achieve great social and economic benefits, good effects, energy saving and environmental protection.

Inactive Publication Date: 2017-06-06
DONGGUAN ZUOYOU ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, strong acids such as nitric acid or aqua regia or highly toxic substances such as cyanide are used in the existing silver immersion technology, which has a great impact on the operating environment and wastewater treatment.

Method used

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Examples

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Effect test

Embodiment 1

[0021] Embodiment 1 This embodiment discloses a method for reclaiming silver from waste solar panels, the method comprising the following steps:

[0022] 2000W waste solar modules are mechanically disassembled, crushed and sorted to obtain 20kg of aluminum, 1kg of copper, 34kg of plastic, and 100kg of ultra-clear glass. After washing, the crystalline silicon solar cell chips are chemically treated; the chemical treatment process is as follows : Soak the solar cell chip in a solid-to-liquid ratio of 1:4 and a concentration of 30% strong alkali solution sodium hydroxide until the aluminum back field is completely removed, the time is 0.5h (the reaction equation with strong alkali is 2Al+2NaOH+2H 2 O=2NaAlO 2 +3H 2 ↑); Then put the aluminum-free solar cell chip into the mixed solution system of 100L nitrite-copper ion, wherein the concentration of sodium nitrite is 1.5m / L and the concentration of copper ion is 0.2m / L, the solution system The pH value of the solution was adjuste...

Embodiment 2

[0023] Embodiment 2 This embodiment discloses a method for reclaiming silver from waste solar panels, the method comprising the following steps:

[0024] 1000W waste solar modules are mechanically disassembled, crushed and sorted to obtain 20kg of aluminum, 1kg of copper, 34kg of plastic, and 100kg of ultra-clear glass. After washing, the crystalline silicon solar cell chips are chemically treated; the chemical treatment process is as follows : Soak the solar cell chip in a strong alkali solution of sodium hydroxide with a solid-to-liquid ratio of 1:6 and a concentration of 20% until the aluminum back field is completely removed, and the time is 3 hours (the reaction equation with strong alkali is 2Al+2NaOH+2H 2 O=2NaAlO 2 +3H 2 ↑); then put aluminum-free solar cell chip into 100L nitrite-copper ion mixed solution system, wherein the concentration of sodium nitrite is 2m / L and the concentration of copper ion is 0.05m / L, the solution system The pH value is adjusted to 3, and ...

Embodiment 3

[0025] Embodiment 3 This embodiment discloses a method for recycling waste solar panel silver, the method comprising the following steps:

[0026] 2000W waste solar modules are mechanically disassembled, crushed and sorted to obtain 20kg of aluminum, 1kg of copper, 34kg of plastic, and 100kg of ultra-clear glass. After washing, the crystalline silicon solar cell chips are chemically treated; the chemical treatment process is as follows : Soak the solar cell chip in a solid-liquid ratio of 1:4 and a concentration of 40% sodium hydroxide strong alkali solution until the aluminum back field is completely removed, and the reaction time is 2h (the reaction equation with strong alkali is 2Al+2NaOH+2H 2 O=2NaAlO 2 +3H 2 ↑); then put aluminum-free solar cell chip into 100L nitrite-copper ion mixed solution system, wherein the concentration of sodium nitrite is 0.5m / L and the concentration of copper ion is 2m / L, the solution system The pH value is adjusted to 6, and the silver is dis...

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Abstract

The invention belongs to the technical field of waste recycling, and particularly relates to a method for recycling silver of a waste solar cell panel. The method comprises the following steps that a, a waste solar cell chip is taken; b, the cell chip is immersed in a sodium hydroxide solution, an aluminum layer on an aluminum back field of the chip is removed, and a silicon wafer obtained after aluminum removal is obtained; c, the silicon wafer obtained after aluminum removal is treated through a mixed solution of nitrite and copper sulfate, silver on a pole plate of an aluminum sheet is leached, and the cell chip obtained after silver extraction is obtained; d, the cell chip obtained after silver extraction is placed in a hydrofluoric acid solution to be immersed, and a silicon material is obtained. According to the method, valuable components of the waste crystal silicon solar chip can be effectively subjected to recycling treatment, and the energy saving and environment-friendly effects are good; and by means of the method, the recycled silver can be collected, the high-purity silicon material can be obtained through posttreatment, and huge social and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of recycling waste materials, and in particular relates to a method for recycling silver from waste solar battery panels with a nitrite solution. Background technique [0002] As a kind of green energy, crystalline silicon solar energy has been popularized around the world since the 1990s. As people pay more attention to environmental protection, the crystalline silicon solar energy industry has developed rapidly. However, the life cycle of solar power plants is generally 20-25 years. When the conversion efficiency drops to a certain level, the batteries will fail and need to be scrapped and updated; in addition, a large number of scrapped components will also be generated during the production of batteries and battery components and the maintenance of photovoltaic power plants. . It is expected that after 2020, the solid waste of solar panels in the world and in my country will increase significantly, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C01B33/037
CPCC01B33/037C22B7/006C22B11/046Y02P10/20
Inventor 张晓飞苏冠贤
Owner DONGGUAN ZUOYOU ELECTRONICS TECH CO LTD
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