ECOLOGICALLY PURE OF EXTRACTION OF NOBLE METALS FROM MATERIALS CONTAINING SUCH METALS Russian patent published in 2001 - IPC

FIELD: metallurgy; methods of extraction of noble metals. SUBSTANCE: proposed method includes leaching of materials by solution containing chloride ions, introducing sulfuric acid and hydrogen peroxide into solution to be leached followed by processing productive solution at extraction of noble metals and returning processed solution for leaching. Sulfuric acid and hydrogen peroxide are introduced into leaching solution in form of mixture; mixing is effected by introducing hydrogen peroxide into sulfuric acid at molar ratio of H₂SO₄:H₂O₂> 1 and at cooling. EFFECT: reduced consumption of reagents; enhanced ecological safety and purity of process. 1 tbl