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Method for recovering indium from waste LCDs

A liquid crystal display and filtrate technology, applied in the direction of improving process efficiency, can solve the problems of difficult to achieve industrialization, low selective absorption rate, etc., and achieve the effects of low equipment requirements, simple operation, and easy control.

Inactive Publication Date: 2014-12-17
ZHUZHOU KENENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a low selective absorption rate for indium and is difficult to realize industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] After disassembling and crushing the discarded liquid crystal display panel containing indium tin oxide, dissolving it with a hydrochloric acid solution with a mass percent concentration of 15% at 60°C for 40 minutes, filtering and separating the insoluble matter, and filtering the obtained filtrate to adjust the pH to 1.8, Stand still until there is no precipitation, filter and separate, and the obtained filtrate adopts D405 chelating resin to selectively adsorb the trivalent indium ion in the filtrate, and the D405 chelating resin that has adsorbed the trivalent indium ion is 2mol / L hydrochloric acid solution Desorption is carried out to obtain a solution containing trivalent indium ions. The dissolution rate of indium is not lower than 99%, and the recovery rate of indium ions is 92% by measuring the change of indium content in the dissolution solution and recovery solution.

Embodiment 2

[0016] After disassembling and crushing the discarded liquid crystal display panel containing indium tin oxide, dissolving it with a hydrochloric acid solution with a mass percentage concentration of 30% at 40°C for 60 minutes, filtering and separating the insoluble matter, and filtering the obtained filtrate to adjust the pH to 2.0, Leave standstill until there is no precipitation, filter and separate, and the obtained filtrate adopts D840 chelating resin to selectively adsorb trivalent indium ions in the filtrate, and the D840 chelating resin that has adsorbed trivalent indium ions is 4mol / L hydrochloric acid solution Desorption is carried out to obtain a solution containing trivalent indium ions. The dissolution rate of indium is not lower than 99%, and the recovery rate of indium ions is 93% by measuring the change of indium content in the dissolution solution and recovery solution.

[0017] It can be seen from Examples 1 and 2 that by controlling the adjustment of the pH ...

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PUM

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Abstract

The invention discloses a method for recovering indium from waste LCDs. The method comprises the following steps: waste LCD panels containing indium tin oxide are dismounted, crushed and then dissolved in an acid solution, and insoluble substances are removed by filtration; the filtrate obtained in the first step is adjusted to an appropriate pH value and then stands for precipitation, and precipitates are removed by filtration; trivalent indium ions in the filtrate obtained in the second step are selectively adsorbed by aminophosphonic acid chelate resin, and then desorbed by a hydrochloric acid solution to obtain a solution containing trivalent indium ions. The method is simple to operate and friendly to the environment, has a good indium separation effect and satisfies mass production.

Description

technical field [0001] The invention relates to a method for recovering indium from waste liquid crystal displays, and belongs to the technical field of indium recovery from electronic waste. Background technique [0002] Indium is a rare metal with lower hardness than lead metal, strong plasticity and ductility, and can be pressed into extremely thin metal sheets; an alloy formed of 24% indium and 76% gallium is liquid at room temperature; indium is One of the key raw materials that cannot be obtained in electronics, telecommunications, and optoelectronic products; 70% of indium is used to manufacture liquid crystal display products. Indium metal is mainly used in notebook computers, TVs, mobile phones and other new liquid crystal displays, touch screens, architectural glass, etc.; as a transparent electrode coating, the ITO indium target material (accounting for 70% of the indium usage rate) is highly competitive As a result, the demand for indium is increasing at an aver...

Claims

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Application Information

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IPC IPC(8): C22B58/00C22B7/00
CPCY02P10/20
Inventor 赵科湘
Owner ZHUZHOU KENENG NEW MATERIAL CO LTD
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