METHOD OF DISSOLVING AND RECOVERING METAL

摘要

A method of dissolving and, if necessary, further recovering noble metals efficiently from industrial raw materials including gold plated materials such as waste electronic parts, platinum catalysts used in the petrochemical industry, and waste ornaments. The conventional dissolving methods using aqua regia, an alkali cyanide solution and so forth are dangerous and necessitate complicated procedures for separating dissolved matters. The invention method comprises dissolving a simple substance of halogen and a soluble halogen compound in a mixture of two solvents that are selected from the group consisting of organic solvents and water and are lowly soluble in each other, immersing raw noble metal materials in the resulting solution to dissolve them in the form of a complex, leaving the solution at rest to cause phase separation, reducing the noble metal complex dissolved in the solvent phase in a high concentration, and recovering the reduced noble metal.