Method for recycling copper indium gallium selenium materials

A method for recovering copper indium gallium selenide material, including the following steps:

• step A, in which the copper indium gallium selenide material is placed in a ball mill for ball milling;
• step B, in which the powders obtained in step A are mixed uniformly with concentrated sulfuric acid and roasted to 750° C., followed by blowing air into the mixture;
• and selenium is removed by absorbing with a secondary suction filter flask;
• step C, in which the amount of selenium in the residue after roasting is detected, if it exceeds a predetermined value, a secondary re-roasting is performed;
• the final residue after roasting is directly dissolved by diluted sulfuric acid;
• step D, in which the dissolved mixture is filtered, followed by adding a sodium hydroxide solution to adjust the pH to 1.8 and extracting copper;
• step E, in which the obtained stripping solution is a copper sulfate solution, which is electrolyzed to give copper metal;
• step F, in which an appropriate amount of a sodium hydroxide solution is added to the residue after copper extraction to adjust the pH value to above 13, followed by stirring at a constant temperature, allowing it to stand and drawing the supernatant, which is a sodium gallate solution, which is washed and settled and then filtered to give indium hydroxide precipitate;
• step G, in which a sulfuric acid solution is added to the sodium gallate solution to adjust the pH value to neutrality, followed by adding polyacrylamide and stirring at a constant temperature to allow flocculation and precipitation;
• after washing and settling, gallium hydroxide precipitate is obtained by direct filtration, which is placed in a drying oven and dried at a constant temperature, followed by heating in a muffle furnace to give gallium oxide;
• and
• step H, in which the indium hydroxide precipitate obtained in step F is reversely dissolved by hydrochloric acid, followed by adjusting the pH to 1.5, heating up and stirring at a constant temperature;
• and the mixture is replaced with a 4N zinc plate, followed by washing and filtering to give sponge indium.