METHOD FOR EXTRACTION OF PALLADIUM (II) FROM WASTED CATALYSTS Russian patent published in 2012 - IPC C22B11/00 C22B3/10 C22B3/24 

FIELD: hydrometallurgy.

SUBSTANCE: the invention relates to hydrometallurgy of precious metals and can be used to extract palladium from wasted catalysts, including catalysts of low-temperature oxidation of carbon oxide (II) based on γ-Al₂O₃, containing palladium chloride (II) and cupric bromide (II). The method includes acid leaching of palladium from wasted catalysts from the chloride solution. Furthermore, the acid leaching is carried out by 1 M solution of hydrochloric acid. The resulting solution is diluted with water to pH 1. The sorption of palladium is carried out from the diluted solution using chemically modified silica containing grafted groups of γ-aminopropyltriethoxysilane.

EFFECT: increased amount of extracted palladiumusing a cheap nitrogen-containing sorbent, the high speed of the process and the possibility to regenerate the sorbent.

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