Research Summary Aqueous ProcessingA 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. José R. Parga, Jesús L. Valenzuela, and Francisco Cepeda T. are with the Instituto Tehnologico de Saltillo in Saltillo, Mexico. Dr. Parga can be reached at jrparga@its.mx.Figure 9. The results of continuous plant operation.
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