US9797027B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9797027-B2 |
| Application number | US-201514795148-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 9, 2015 |
| Priority date | Mar 18, 2015 |
| Publication date | Oct 24, 2017 |
| Grant date | Oct 24, 2017 |
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Provided is a method for recycling indium from a panel on which an electrode layer made of indium tin oxide (ITO) is formed, comprising: S1 —removing each of pattern layers on the panel to obtain particles formed by the pattern layers; S2 —adding an acid solution to the particles so as to dissolve the substances which can be dissolved in the acid solution, and then filtering to give a solution containing indium ion; S3 —adding an alkaline solution to the solution obtained in step S2, so that metal ions other than indium ion can form precipitates with hydroxyl ion; S4 —filtering off the precipitates formed in step S3; and S5 —evaporating the solution obtained in step S4 to obtain crystals of indium salt. The method improves the reusing rate of the defective panels, is helpful to environment protection, and saves resources.
Opening claim text (preview).
The invention claimed is: 1. A method for recycling indium from a panel on which an electrode layer made of indium tin oxide (ITO) is formed, comprising: S1—removing each of pattern layers on the panel to obtain particles formed by the pattern layers; S2—adding an acid solution to the particles so as to dissolve the substances which can be dissolved in the acid solution, and then filtering to give a solution containing indium ion; S3—adding an alkaline solution to the solution obtained in step S2, so that metal ions other than indium ion can form precipitates with hydroxyl ion; S4—filtering off the precipitates formed in step S3; and S5—evaporating the solution obtained in step S4 to obtain crystals of indium salt; wherein the alkaline solution in step S3 is aqueous ammonia, and the acid solution in step S2 is a hydrochloric acid solution and the indium salt obtained in step S5 is indium chloride. 2. The method according to claim 1 , wherein it further comprises: S6—reducing the indium salt to obtain metal indium. 3. The method according to claim 2 , wherein, in step S1, a mixture of water and particles formed by said pattern layers is obtained by polishing the panel while washing the panel with water; and in step S2, and the acid solution is added into the mixture of water and particles formed by said pattern layers. 4. The method according to claim 2 , wherein the panel is a touch screen panel. 5. The method according to claim 1 , wherein step S5 comprises: S5-1: evaporating the solution obtained in step S4 to give crystals comprising ammonium chloride and indium chloride; and S5-2: heating the obtained crystals so that ammonium chloride in the crystals decomposes into hydrogen chloride and ammonia gas, thereby separating indium chloride from ammonium chloride. 6. The method according to claim 5 , wherein the heating temperature in step S5-2 is 250-350° C. 7. The method according to claim 6 , wherein, in step S1, a mixture of water and particles formed by said pattern layers is obtained by polishing the panel while washing the panel with water; and in step S2, and the acid solution is added into the mixture of water and particles formed by said pattern layers. 8. The method according to claim 6 , wherein the panel is a touch screen panel. 9. The method according to claim 5 , wherein step S5 further comprises: S5-3: introducing hydrogen chloride and ammonia gas obtained in step S5-2 into a cooling chamber so that hydrogen chloride and ammonia gas can re-crystallize into ammonium chloride. 10. The method according to claim 9 , wherein the alkaline solution used in step S3 is prepared from the ammonium chloride obtained in step S5-3. 11. The method according to claim 5 , wherein, in step S1, a mixture of water and particles formed by said pattern layers is obtained by polishing the panel while washing the panel with water; and in step S2, and the acid solution is added into the mixture of water and particles formed by said pattern layers. 12. The method according to claim 5 , wherein the panel is a touch screen panel. 13. The method according to claim 1 , wherein, in step S1, a mixture of water and particles formed by said pattern layers is obtained by polishing the panel while washing the panel with water; and in step S2, and the acid solution is added into the mixture of water and particles formed by said pattern layers. 14. The method according to claim 1 , wherein the panel is a touch screen panel.
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