Zinc recovery from acidic aqueous streams

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iib metal

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423 24, 423622, C01G 902

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active

039819663

ABSTRACT:
A process for the recovery of metal values, principally zinc and copper, from an aqueous acidic purge stream in a hydrometallurgical process by contacting the stream containing the iron, copper and zinc sulfates, along with trace amounts of other metallic sulfates with calcium oxide to bring the pH in the range 3.0-4.0, thence with sufficient ammonia to form the soluble tetrammine sulfates of copper and zinc, then separating the copper from the zinc, e.g. by hydroxy oxime-solvent extraction and thereafter recovering the zinc as zinc oxide by converting the zinc tetrammine sulfate to the hydroxide and removing ammonia from the complex.

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C.I.M. Bulletin, Feb., 1975, pp. 105, 106, 113, (Ritcey et al.).
Fletcher et al., "Napthenic Acid as a Liquid-Liquid Extraction Reagent for Metals" Inst. Mining & Metallurgy, England 1961, pp. 355, 365.

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