RECOVERY OF GOLD AND SILVER FROM COMPLEX REFRACTORY SULPHIDE ORES BY CYANIDISATION AND OXIDATION WITH PEROXIDES

RECOVERY OF GOLD AND SILVER FROM COMPLEX REFRACTORY SULPHIDE ORES BY CYANIDISATION AND OXIDATION WITH PEROXIDES

The recovery of noble metals by sodium cyanide leaching from complex refractory gold and silver bearing ores containing such complex silver sulphides as polybasite, pearcite, pyrargyrite, tetrahedrite and argentite presents difficulties in that the precious metal is trapped inside the refractory mat...

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Bibliographische Detailangaben
Hauptverfasser: SPIETH, MICHELLE ANNE, SMITH, TREVOR JOHN, RODEN, STEPHEN JAMES, CHOUZADJIAN, KEVORK AVADIS
Format: Patent
Sprache:eng ; fre
Schlagworte:
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
PRETREATMENT OF RAW MATERIALS
PRODUCTION AND REFINING OF METALS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:The recovery of noble metals by sodium cyanide leaching from complex refractory gold and silver bearing ores containing such complex silver sulphides as polybasite, pearcite, pyrargyrite, tetrahedrite and argentite presents difficulties in that the precious metal is trapped inside the refractory matrix of the mineral. Pretreatments such as roasting, acid pressure leaching and biological leaching are capital intensive and to obviate this disadvantage, the use of an alkali/alkaline earth metal peroxide is applied as an additive, in an amount ranging from 0.1 to 5.0 kg/t. Preference is for calcium peroxide, which is more stable, consumes less cyanide, is simple to use and monitor, and enhances the process and recovery by improvement in leach kinetics.