METHOD OF PREPARING RHODIUM, PALLADIUM, AND RUTHENIUM CONCENTRATES FROM NITRIC ACID SOLUTIONS

• Main Authors: KHRANENKO S.P, EMEL'JANOV V.A, BELJAEV A.V, KORDA T.M
• Format: Patent
• Language: English; Russian
• Published: 10.11.2004
• Edition: 7
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

FIELD: precious metal technology. ^ SUBSTANCE: objective of invention is, in particular, method of preparing concentrates of rare platinum metals and palladium, which method can be used for recovering platinum metals from slimes produced by electrolytic refining of copper and nickel, processing nuclear fuel, processing exhausted catalysts and scrap of electrical and electronic machinery. Precipitation is effected from solutions with 2-3 mole/l nitric acid concentration by adding thereto alkali metal thiocyanate in solid state in excess constituting 1/3 part of nitric acid in solution and at temperature 18 to 80. Subsequent calcination of precipitate is performed at 750-800. ^ EFFECT: improved environmental safety, simplified process at the same degree of precious metal recovery. ^ 2 cl, 1 tbl, 2 ex