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Recycling method for indium in mechanical peeling product of waste liquid crystal panel

A mechanical peeling, liquid crystal panel technology, applied in the field of industrial waste treatment and recycling, can solve problems such as ecological environment and human health hazards, and achieve the effects of large acid consumption, high indium recovery rate and purity, and clean treatment process.

Inactive Publication Date: 2016-11-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these activities, most of them are treated directly by dissolution and acid leaching, which produces a large amount of waste acid, and most of the waste liquid is directly discharged into the environment. Since the waste liquid contains a large number of harmful components, this method is harmful to the ecological environment and human beings. very dangerous to health

Method used

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  • Recycling method for indium in mechanical peeling product of waste liquid crystal panel
  • Recycling method for indium in mechanical peeling product of waste liquid crystal panel
  • Recycling method for indium in mechanical peeling product of waste liquid crystal panel

Examples

Experimental program
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Effect test

Embodiment 1

[0046] First, a certain amount of waste liquid crystal panel mechanical peeling products are placed in a vacuum cracking furnace for vacuum cracking, and then the vacuum degree in the furnace is maintained below 2Pa, and the temperature is kept at 500°C, and heated for 30 minutes to make it fully react. The cracking process The pyrolysis oil and pyrolysis gas produced in the process are burned in the combustion chamber and discharged after purification treatment; the liquid crystal separation rate obtained by vacuum cracking reaction is 90.30%. Then carry out vacuum chlorination reaction on the residue after the vacuum cracking reaction in a vacuum induction melting furnace to obtain chlorides rich in indium and tin, and to obtain chlorides of indium and tin. The process condition is to add NH 4 The mass ratio of Cl and glass powder is 1:5, the vacuum degree is 500Pa, the temperature is 500°C, and the indium recovery rate is 92.78% after heating for 30 minutes. Then the indium...

Embodiment 2

[0048] First, a certain amount of waste liquid crystal panel mechanical stripping products are placed in a vacuum cracking furnace for vacuum cracking, and then the vacuum degree in the furnace is maintained below 2Pa, and the temperature is kept at 800°C, and heated for 30 minutes to make it fully react. The cracking process The pyrolysis oil and pyrolysis gas produced in the process are burned in the combustion chamber and discharged after purification treatment; the liquid crystal separation rate obtained by vacuum cracking reaction is 95.62%. Then carry out vacuum chlorination reaction on the residue after the vacuum cracking reaction in a vacuum induction melting furnace to obtain chlorides rich in indium and tin, and to obtain chlorides of indium and tin. The process condition is to add NH 4 The mass ratio of Cl and glass powder is 1:3, the vacuum degree is 1000Pa, the temperature is 500°C, and the indium recovery rate is 86.4% after heating for 30 minutes. Then the indi...

Embodiment 3

[0050] First, a certain amount of waste liquid crystal panel mechanical peeling products are placed in a vacuum cracking furnace for vacuum cracking, and then the vacuum degree in the furnace is maintained below 500Pa, and the temperature is kept at 500°C, and heated for 30 minutes to make it fully react. The cracking process The pyrolysis oil and pyrolysis gas produced in the process are burned in the combustion chamber and discharged after purification treatment; the liquid crystal separation rate obtained by vacuum cracking reaction is 87.5%. Then carry out vacuum chlorination reaction on the residue after the vacuum cracking reaction in a vacuum induction melting furnace to obtain chlorides rich in indium and tin, and to obtain chlorides of indium and tin. The process condition is to add NH 4 The mass ratio of Cl and glass powder is 1:6, the vacuum degree is 500Pa, the temperature is 700°C, and the indium recovery rate is 94.6% after heating for 30 minutes. Then the indium...

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Abstract

The invention discloses a recycling method for indium in a mechanical peeling product of a waste liquid crystal panel. Firstly, the mechanical peeling product of the waste liquid crystal panel is placed in a vacuum pyrolysis furnace to be subject to vacuum pyrolysis, liquid crystals in the mechanical peeling product of the waste liquid crystal panel are subject to a pyrolysis reaction and evaporation, pyrolysis products (pyrolysis oil and pyrolysis gas) of the liquid crystals volatilize to a condensing unit of the vacuum pyrolysis furnace, and the pyrolysis oil and the pyrolysis gas are collected; residue obtained after the vacuum pyrolysis reaction is subject to vacuum oxychlorination reaction in a vacuum induction smelting furnace, and chloride rich in indium and tin is obtained; the chloride product rich in indium and tin is subject to the replacement reaction and electrolytic refining of metal aluminum, and 99.999% fine indium products are obtained; the liquid crystal removal rate and the recycling rate of the fine indium products each reach above 90%, and the recycling rate of indium reaches above 95%; and the method has the beneficial effects of being efficient, environment-friendly and high in resource degree and is suitable for large-scale industrialized application.

Description

technical field [0001] The invention relates to a method for recovering indium by utilizing the vacuum cracking and vacuum chlorination process of liquid crystals in mechanical stripping products of waste liquid crystal panels, and is an environmentally friendly and highly efficient method for comprehensively recovering waste liquid crystal panels. The invention belongs to the field of industrial waste treatment and recycling in the technical field of environmental protection. Background technique [0002] With the continuous development of science and technology, the technological innovation of high-tech electronic information industry continues to accelerate, and the continuous increase of human needs has led to the rapid replacement of electronic products such as mobile phones, computers, and household appliances, and the life cycle of products has become shorter and shorter. ; And liquid crystal display (LCD) is indispensable in these electronic products. Liquid crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B58/00C22B25/06C25C1/22
CPCC22B7/001C22B25/06C22B58/00C25C1/22Y02P10/20
Inventor 许振明张灵恩陈亚樊红杰
Owner SHANGHAI JIAO TONG UNIV