Pengaruh Variasi Konsentrasi CN- Pada Proses Pelindian Bijih Au Terhadap Recovery Au, Gangue Ag, Cu dan Fe

Sutarno Sutarno
Andri Kabarubun (Universitas Jenderal Achmad Yani)
Iskandar Muda (Universitas Jenderal Achmad Yani)
R.M Ario Adisaputro

Jurnal Metalurgi dan Material Indonesia
Vol. 2 No. 2 (2019): Agustus

Gold is a precious metal, valuable, and widely found in Indonesia. Gold metal applications can be found in the jewelry, medical, catalyst and high-tech industries. In this study 35 mm of gold ore with a level of 15.6 ppm was extracted using NaCN as a lixiviant. The leaching process parameters included variations in 200, 300, and 400 ppm CN- concentrations, 48 hour leaching time and lixiviant pH in the range of 10-11. To increase the extraction rate was added Pb(NO3)2 catalyst and 15 ppm oxygen. Characterization results with AAS obtained the highest gold recovery was 88.46% Au at CN-300 ppm concentration, leaching time of 8 hours. In addition to gold metal, other metals are also found as gangue such as Ag, Cu and Fe.