INDIUM HYDRATE CAKE AND COPPER SULFIDE CAKE EXTRACTION METHOD FROM SPENT ACIDS OF THE ITO SPUTTERING PROCESS

摘要

PURPOSE: A recovering method of indium hydroxide containing cake and copper sulfide containing cake from ITO(indium-tin oxide) sputtering waste acid is provided to resolve problems wherein indium is not capable of being produced from the ITO sputtering waste acid containing a high concentration of copper, and to recycle wasted copper. CONSTITUTION: A recovering method of indium hydroxide containing cake and copper sulfide containing cake from ITO(indium-tin oxide) sputtering waste acid comprises the following steps. Copper hydroxide containing slurry and low grade indium hydroxide containing slurry are dehydrated to collect the copper hydroxide containing cake and a low grade indium hydroxide containing cake(P100). The copper sulfide containing cake is collected by dehydrating the copper sulfide containing slurry which is generated in a hydrochloric acid solution by the addition of sodium hydrosulphide and sulfuric acid after the copper hydroxide containing cake and the low grade indium hydroxide containing cake is dissolved in the hydrochloric acid solution(P200). High grade indium hydroxide containing slurry is precipitated, separated, and dehydrated to collect a high grade indium hydroxide containing cake(P300). A caustic soda dose is within the range satisfying the pH 9.0-13.0, and 10-25 parts by volume of 50% caustic soda is inputted corresponding to 100 parts by volume of ITO sputtering waste acid. [Reference numerals] (P100) Step of recovering a cake containing copper hydroxide and low grade indium hydroxide; (P200) Step of recovering a cake containing copper sulfide; (P300) Step of recovering a cake containing high grade indium hydroxide;