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
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[0063] Example 1
[0064] 1) Weigh 100kg of waste liquid crystal panels, cut the waste liquid crystal panels to a size of 1~4cm×3~4cm, soak in 2L acetone at room temperature for 80min, peel off the glass substrate and polarizer, and then peel off the peeled glass substrate Air dry for about 1h.
[0065] 2) Then crush the dried glass substrate to 80 mesh powder. The acetone solution is separated by filtration, and the acetone is distilled out at atmospheric pressure for recycling. The residue is collected separately and then burned at a high temperature.
[0066] 3) Take 1kg of the aforementioned glass substrate powder and mix it with 4.5L of dilute hydrochloric acid with a concentration of 6mol / L, and reflux for 5h with stirring at 85°C to complete an acid immersion. After cooling to room temperature, press filter to separate dilute hydrochloric acid, add 6mol / L dilute hydrochloric acid to 4.5L, and use it for the next acid leaching. That is, another 1 kg of glass substrate powder...
Example Embodiment
[0072] Example 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 measured indium leaching rate was 82.1wt%.
[0074] The purity of the crude indium obtained by replacing the indium in the filtrate with the zinc plate was 99 wt%, and the recovery rate was 97.5 wt% (relative to the indium content of the leaching solution).
Example Embodiment
[0075] Example 3
[0076] The basic operation is the same as in Example 1, except that in step 3), a mixed acid of dilute hydrochloric acid and dilute nitric acid is used instead of dilute hydrochloric acid for acid leaching. The concentration of dilute hydrochloric acid is 5 mol / L and the concentration of dilute nitric acid is 2 mol / 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 measured leaching rate of indium was 93.2wt%.
[0077] The purity of the crude indium obtained by replacing the indium in the filtrate with the zinc plate was 99 wt%, and the recovery rate was 97.5 wt% (relative to the indium content of the leaching solution).
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