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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Comparative Example 1

[0014] After disassembling and pulverizing the waste liquid crystal display panel containing indium tin oxide, it is dissolved in a hydrochloric acid solution with a concentration of 15% by mass at 60°C for 40 minutes, and then the insoluble matter is separated by filtration. After filtering the filtrate to adjust the pH to 1.8, Let stand until there is no precipitation, filter and separate, the obtained filtrate adopts D405 chelating resin to selectively adsorb trivalent indium ions in the filtrate, and D405 chelating resin that adsorbs trivalent indium ions uses a 2mol / L hydrochloric acid solution. Desorption is performed to obtain a solution containing trivalent indium ions. The dissolution rate of indium is not less than 99%, and the indium ion recovery rate is 92% by measuring the change of the indium content in the dissolution liquid and the recovery solution.

Example Embodiment

[0015] Example 2

[0016] After disassembling and pulverizing the waste liquid crystal display panel containing indium tin oxide, dissolving it with 30% by mass hydrochloric acid solution at 40°C for 60 minutes, filtering out the insoluble matter, and filtering the filtrate to adjust the pH to 2.0. Let stand until there is no precipitation, filter and separate, the obtained filtrate adopts D840 chelating resin to selectively adsorb trivalent indium ions in the filtrate, and D840 chelating resin with trivalent indium ions is used with a concentration of 4mol / L hydrochloric acid solution Perform desorption to obtain a solution containing trivalent indium ions. The dissolution rate of indium is not less than 99%, and the indium ion recovery rate is 93% by measuring the change of indium content in the dissolution liquid and the recovery solution.

[0017] From Examples 1 and 2, by controlling the adjustment of the pH value of the eluate and using a suitable resin, the indium in the wa...

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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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