Method for recycling germanium, gallium, indium and selenium in waste diode

A recovery method and diode technology, applied in chemical instruments and methods, solid waste removal, gallium/indium/thallium compounds, etc., can solve the problems of waste of resources, pollution of the environment by waste diodes, etc., and achieve pollution reduction, low cost, and high purity high effect

Active Publication Date: 2013-03-06
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a brand-new recovery method for germanium, gallium, indium, and selenium in waste diodes in order to solve the problems of waste diodes polluting the environment and waste of gallium, germanium, indium, and selenium resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 1 kg of diodes disassembled from electronic waste, and crush them by mechanical crushing or ball milling to destroy the shell and expose the semiconductor material inside. The average diameter of the crushed material is 0.05mm.

[0028] Metal and non-metal are separated by electrostatic separation, so that plastic powder and metal powder are separated. After testing, the content of scrap metal inside is 5%.

[0029] Oxidation roasting, the separated metal powder is roasted with oxygen at 550°C, the roasting time is 4 hours, and the flow rate of oxygen is 2m 3 / (kg of material.hour), while the flue gas is condensed with cold water until the temperature is 130°C, and the solid particles are collected with a mass of 50g. After testing, they contain selenium dioxide, arsenic trioxide, phosphorus pentoxide and other substances. At the same time, the condensed The gas is passed into 6mol / l sodium hydroxide solution to absorb other acid gases such as hydrogen bromide and ...

Embodiment 2

[0035] Take 1 kg of waste diodes, and use mechanical crushing to expose the internal semiconductor material. The average diameter of the crushed material is 0.1mm.

[0036] Metal and non-metal are separated by water separation, so that plastic powder and metal powder are separated. After testing, the content of scrap metal inside is 5%.

[0037] Oxidation roasting, the separated metal powder is roasted with oxygen at 650°C, the roasting time is 2 hours, and the flow rate of oxygen is 3m 3 / (kg of material.hour), at the same time, the flue gas is condensed with cold water until the temperature is 150°C, and the solid particles are collected, with a mass of 48g. After testing, they contain selenium dioxide, arsenic trioxide, phosphorus pentoxide and other substances. At the same time, the condensed The gas is passed into 6mol / L sodium hydroxide solution to absorb other acid gases such as hydrogen bromide and chlorine. The obtained calcined material contains gallium oxide, germa...

Embodiment 3

[0042] Take 1 kg of waste diodes, and use mechanical crushing to expose the internal semiconductor material. The average diameter of the crushed material is 0.01mm.

[0043] Metal and non-metal are separated by electrostatic separation, so that plastic powder and metal powder are separated. After testing, the content of scrap metal inside is 5%.

[0044] Oxidation roasting, the separated metal powder is roasted with oxygen at 460°C, the roasting time is 6 hours, and the flow rate of oxygen is 1m 3 / (kg of material.hour), at the same time, the flue gas is condensed with cold water until the temperature is 100°C, and the solid particles are collected, with a mass of 51g. After testing, they contain selenium dioxide, arsenic trioxide, phosphorus pentoxide and other substances. At the same time, the condensed gas Then pass it into 6mol / L sodium hydroxide solution to absorb other acid gases such as hydrogen bromide and chlorine. The obtained calcined material contains gallium oxid...

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Abstract

The invention relates to treatment of waste metal materials, and in particular relates to a method for recycling germanium, gallium, indium and selenium in a waste diode. The recycling method comprises the following steps of: (1) crushing the waste diode; (2) separating plastic powder from metal powder; (3) oxidizing roasting; (4) recycling selenium; and (5) recycling gallium, indium and germanium. By using the method, the pollution of the diode on the environment is reduced, valuable elements of selenium, indium, gallium and germanium are recycled, and mineral resources are saved; and the method is simple to operate, lower in cost, high in recycling rate of selenium, indium, gallium and germanium elements and very high in purity of recycling products.

Description

technical field [0001] The invention relates to the treatment of waste metal materials, in particular to a recovery method for germanium, gallium, indium and selenium in waste diodes. Background technique [0002] Diodes have the functions of rectification, detection, amplitude limiting, voltage stabilization, protection, etc., and are widely used in various electronic circuits. The semiconductor materials include gallium arsenide, aluminum gallium arsenide, indium gallium nitride, zinc selenide, phosphide Indium gallium aluminum, germanium, etc., when disposing of circuit boards or electronic waste containing diodes, a large number of discarded diodes will be produced. These discarded diodes contain valuable metals such as gallium, germanium, indium, selenium, and toxic elements such as arsenic. Discarding or burying will not only pollute the environment, but also not conducive to building a conservation-minded society. Contents of the invention [0003] The object of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02C01G15/00C01G9/04C01G17/04B09B3/00
Inventor 王勤杨柳陈艳红谭翠丽严杰王阳烨
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
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