METHOD OF RECOVERING HIGH-PURITY PLATINUM AND PALLADIUM

摘要

PROBLEM TO BE SOLVED: To provide a method of efficiently removing the cobalt, chromium, copper, iron, nickel, silicon, etc., included into scrap, such as mills end, swarf and grinding chips, produced in production process steps, etc., for platinum and platinum-containing targets for sputtering and recovering the high-purity platinum and palladium recyclable to the palladium and platinum-containing targets at a low cost. SOLUTION: This method of recovering the high-purity platinum comprises dissolving the platinum-containing scrap with an acid and removing residues, then reacting the acid dissolving the platinum and ammonia chloride solution, precipitating and recovering the same as ammonium chloroplatinate and further roasting the same, thereby obtaining a platinum sponge.