PROCESS FOR THE RECOVERY OF RUTHENIUM FROM MATERIAL CONTAINING RUTHENIUM OR RUTHENIUM OXIDE OR FROM RUTHENIUM-CONTAINING NOBLE METAL ORE CONCENTRATE

摘要

PPROBLEM TO BE SOLVED: To solve the problems that aqua regia or concentrated acids/chlorine gas used as oxidising agent do not dissolve ruthenium or only very slowly, further, ruthenium is soluble in sodium hypochlorite liquor; however, volatile ruthenium (VIII) oxide is partly formed in this case directly, as a result, the digestion step can not be separated from the separation step, further, the selenium contained in ore concentrates interferes with the purification of the noble metals in the further steps such that its rapid elimination, if possible at the beginning of the partitioning process, is desirable. PSOLUTION: Ruthenium-containing material and nitrate as oxidising agent are introduced into a highly alkaline potassium hydroxide melt. PCOPYRIGHT: (C)2009,JPO&INPIT