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Method for recovering indium from waste liquid crystal panels through acid leaching-cation exchange resin adsorption technology

A technology of cation exchange and resin adsorption, which is applied in the field of recovery of indium from waste liquid crystal panels by acid leaching-cation exchange resin adsorption process, can solve the problems of low recovery process efficiency and high impurity content, and achieve efficient recovery, low impurity content, and process flow concise effect

Inactive Publication Date: 2012-12-19
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is the low efficiency and high impurity content of the traditional low-grade indium recovery process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 1) Weigh 100kg of waste liquid crystal panel, cut the waste liquid crystal panel into 1~4cm×3~4cm size, soak it in 2L acetone at room temperature for 80min, peel off the glass substrate and polarizer, and then peel off the stripped glass substrate Air dry for about 1h.

[0065] 2) Then pulverize the dried glass substrate to 80 mesh powder. The acetone solution is separated by filtration, the acetone is distilled out under atmospheric pressure for recycling, and the residue is collected separately and then incinerated at high temperature.

[0066] 3) Take 1 kg of the above-mentioned glass substrate powder and mix it with 4.5 L of dilute hydrochloric acid with a concentration of 6 mol / L, and reflux the reaction for 5 hours under stirring at 85 ° C to complete an acid leaching. After cooling to room temperature, dilute hydrochloric acid was separated by pressure filtration, supplemented with 6mol / L dilute hydrochloric acid to 4.5L, and used for the next acid leaching. Th...

Embodiment 2

[0073] The basic operation is the same as in Example 1, except that in step 3), dilute nitric acid is used instead of dilute hydrochloric acid for acid leaching, the concentration of dilute nitric acid is 3mol / L, the reaction temperature of acid leaching is 90°C, and the reaction time is 6h. The leaching rate of indium was measured to be 82.1wt%.

[0074] The purity of the crude indium obtained by replacing the indium in the filtrate with the zinc plate is 99wt%, and the recovery rate is 97.5wt% (relative to the indium content of the leaching solution).

Embodiment 3

[0076] The basic operation is the same as in Example 1, except that in step 3), the mixed acid of dilute hydrochloric acid and dilute nitric acid is used instead of dilute hydrochloric acid for acid leaching, wherein the concentration of dilute hydrochloric acid is 5mol / L, and the concentration of dilute nitric acid is 2mol / L L, the molar ratio of hydrochloric acid and nitric acid is 5:2, the reaction temperature of acid leaching is 85°C, and the reaction time is 5h. The leaching rate of indium was measured to be 93.2wt%.

[0077] The purity of the crude indium obtained by replacing the indium in the filtrate with the zinc plate is 99wt%, and the recovery rate is 97.5wt% (relative to the indium content of the leaching solution).

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Abstract

The invention relates to the recovery field of regeneration indium, in particular to a method for recovering indium from waste liquid crystal panels through an acid leaching-cation exchange resin adsorption technology, and solves the technical problem of low efficiency of the traditional low-level indium recovery technology has. To solve the technical problems, the technical scheme provided by the invention is to provide the method for recovering indium from waste liquid crystal panels through the acid leaching-cation exchange resin adsorption technology. The method comprises the following steps of: separating a glass substrate from a waste liquid crystal plate; crushing the glass substrate to obtain glass powder; carrying out acid leaching to the glass powder; processing the leaching liquid through countercurrent adsorption via the strong-acid cation exchange resin; and soaking the strong-acid cation exchange resin subjected to the countercurrent adsorption through inorganic acid so as to obtain the soaking liquid; adjusting the pH value of the soaking liquid through inorganic base; filtering and separating the tin hydroxide precipitation; collecting the filtrate; and replacing the indium in the filtrate through a zinc plate. The method is an effective method for recovering the indium from waste liquid crystal panels.

Description

technical field [0001] The invention relates to the field of recovery of secondary indium. Specifically, the invention relates to a method for recovering indium from waste liquid crystal panels by an acid leaching-cation exchange resin adsorption process. Background technique [0002] Indium is a rare and precious metal, which is widely used in high-tech fields such as electronic computers, solar cells, optoelectronics, national defense, aerospace, nuclear industry and modern information industry. Indium is mainly used in the electronics industry, such as transparent electrodes, welding materials, and compound semiconductors used in liquid crystal displays. Indium is also used in phosphors, low-melting point alloys, battery materials, dental alloys, and bearings. [0003] With the rapid popularization of household appliances such as mobile phones, notebook computers, and LCD TVs, the amount of indium used in transparent electrodes has increased rapidly, especially the rapid...

Claims

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Application Information

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IPC IPC(8): C22B58/00C22B3/06C22B3/24
Inventor 潘晓勇田晖陈贻炽彭玲陈正
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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