PROCESSING METHOD OF LEAD-ZINC CONTAINING ORES Russian patent published in 2010 - IPC C22B19/34 C22B13/00 C22B1/02 C22B3/04 

FIELD: metallurgy.

SUBSTANCE: method involves processing by using ammonium chloride, obtaining of chlorides solution, extraction of zinc from the solution. At that, sulphide, oxidated or mixed zinc-lead containing ores are subject to processing by using solid ammonium chloride in quantity of 100-130% of stoichiometric ratio at temperature of 200-320°C. Solution of chlorides is obtained by water leaching of the obtained mixture of chlorides. Iron is separated in the form of hydroxide from the obtained solution at pH 4. After iron is separated, zinc is extracted in the form of zinc hydroxide by adding ammonium to the solution to pH 7. Obtained hydroxides are calcinated till oxides are obtained. Lead is extracted from residual water leaching in the form of chloride by leaching with sodium chloride solution with concentration of 300-320 g/l at temperature of 70-95°C.

EFFECT: possibility of developing effective and environmentally safe technology for processing of sulphide, oxidated or mixed zinc-lead containing ores.

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