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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 3    No. 4    December 1993

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KINETICS OF GOLD LEACHING FROM SULFIDE GOLD CONCENTRATES WITH THIOSULFATE SOLUTION
Gong  Qian;  Hu  Jiexue;  Cao  Changlin

Institute of Chemical Metallurgy; Academia Sinica; Beijing 100080; China

Abstract:The reaction process for leaching gold from sulfide gold concentrates containing copper with ammonia-ammonium thiosulfate solution containing copper(Ⅱ)can be divided into initial stage and later stage of reaction.Initial stage of reaction is controlled by interface reaction.Lat- er stage of reaction is controlled by diffusion process of reaction through solid products layer. Whole leaching process is under the control of corrosion reaction of pyrite bearing gold.Action of ammonium sulfate in the system is probably as follows:(1)NH4+ and NH3 forms a buffer so- lution;(2)SO4~(2-)ion inhibites the oxidation and decomposition of S2O3 ~(2-)ion.Cu~(2+)ion in the system acts as an oxidant and oxygen makes the Cu~(2-)regenerate.

 

Key words: thiosulfate; gold; leaching kinetics; sulfide ore

ISSN 1672-7029
CN 43-1423/U

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