| abstract |
【Task】, Indium that can recover indium with a high recovery rate from indium-containing materials containing metal impurities such as Zn, Fe, Cu, Al, Ga, As, and Cd, and that can make the equipment compact. Provide a method of recovery. 【Solution】 A predetermined amount of calcium hydroxide was added to the indium-containing leachate obtained in the SO 2 leaching step, and sodium hydroxide was further added to control the pH within a range of 2 to 2.5 to remove the formed gypsum. Thereafter, zinc powder is added to cause indium to undergo substitution deposition as an indium sponge, and the post-substitution liquid produced along with the substitution deposition is sent to the wastewater treatment step without repeating the previous step. [Selection] Figure 1 |