METHOD OF RECOVERING PALLADIUM FROM SOLUTIONS Russian patent published in 2005 - IPC

FIELD: waste water treatment and hydrometallurgy.

SUBSTANCE: invention relates to recovering palladium from nitric acid, nitric acid-hydrochloric acid, and nitric acid-fluoride-hydrochloric acid solutions used for etching parts and units of equipment for isotope separation chambers. Palladium is sorbed from solutions having nitric acid concentration 30 to 250 g/L with mixture of epoxypolyamine-type low-basicity anionite, containing alternating groups of secondary and tertiary amines, ethers, and alcohols, and high-basicity anionite with quaternary ammonium base groups, content of low-basicity anionite (e.g. AN-31) being 98-99% and that of high-basicity anionite (e.g. AV17*8) 1-2%. Thereafter, anionites are subjected to stepped combustion: first for 2-4 h at 350-400°C and then for 2-4 h at 950-1000°C to produce metallic palladium, which is cooled under vacuum or in an inert gas atmosphere.

EFFECT: increased selectivity of refining process removing polyvalent metal impurities and increased degree of recovery.

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