Recovery of Silver From an Arsenical Silver Ore by Knelson Concentrator and Cyanide Leaching


Celep O., Altinkaya P., Yazici E. Y. , Deveci H.

24th INTERNATIONAL MINING CONGRESS OF TURKEY, Antalya, Türkiye, 14 - 17 Nisan 2015, ss.1194-1198 identifier identifier

  • Cilt numarası:
  • Basıldığı Şehir: Antalya
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.1194-1198

Özet

In this study, the recovery of silver from an arsenical silver ore was investigated using a laboratory type Knelson Concentrator and cyanide leaching. Silver was found to be as acanthite, which occurs both as free grains and closely associated with other mineral phases such as quartz, barite, mica and the group of clay minerals. Gravity tests have demonstrated that the silver recovery tends to increase with increasing the rotation speed of bowl or decreasing the fluidizing water velocity. About 30% of the silver was recovered into a concentrate assaying 275 g/t Ag. Cyanide leaching tests have revealed that the silver extraction substantially improved from 60% up to 85% in cyanidation after ultra-fine grinding of the ore to <8 mu m (d(80)). These findings indicate that the ore is not particularly amenable to centrifugal gravity separation. It can be also deduced from cyanide leaching tests that the refractoriness of the ore is essentially physical in character apparently due to the physical encapsulation of silver phases.