Pressure cyanide leaching for precious metals recovery

Research paper by José R. Parga, Jesús L. Valenzuela, Cepeda T. Francisco

Indexed on: 09 Oct '07Published on: 09 Oct '07Published in: JOM (Warrendale, Pa. : 1989)


A novel method demonstrates that the oxidation and dissolution of gold and silver in alkaline cyanide solution can be conducted simultaneously in the same autoclave in less than 90 minutes with a recovery that exceeds 96%. Because mild operating conditions of 80°C and 0.6 MPa oxygen pressure are used in this process, low cost materials of construction can be utilized for the autoclave.