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PRETREATMENT OF ANTIMONIAL REFRACTORY GOLD AND SILVER ORES FOR IMPROVED CYANIDATION

AUTHOR/S: O. CELEP, I. ALP, H. DEVECI
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 677-682 pp

ABSTRACT

In this study, the effect of roasting and alkaline sulphide leaching pre-treatments on gold
and silver recoveries by cyanidation from an antimonial refractory ore was investigated.
Alkaline sulphide leach test for decomposition of antimonial sulphides were performed
using Na2S and NaOH solution as leachant. Up to 85% of antimony was removed by
suitably adjusting the molar concentration of the leachant solution over two hours of
leach time. Gold recovery in cyanidation was low (≤50%) without pretreatment, but it
was increased to 80% after alkaline sulphide pretreatment. Similarly, Ag recovery was
significantly improved from 5-10% to 90% after Na2S pretreatment. This study has
shown the feasibility of the alkaline sulphide leaching as pretreatment prior to the
conventional cyanidation for antimonial refractory ores.

Keywords: refractory gold-silver ores, antimony minerals, alkaline sulphide leach, roasting, cyanidation

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