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.
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[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.
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[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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