Evaluation of a Novel Magnetic Activated Carbon Process for Gold Recovery

72321B03-I The processing rate in gold extraction applications is limited by current production methods. Activated carbon could be used to adsorb the dissolved gold, but its use is restricted by the need to remove spent granular carbon from the bulk ore by mechanical screening. An innovative technology that eliminates this processing step and improves the reaction kinetics would reduce energy consumption and minimize the waste generated per unit of gold produced. Losses associated with carbon degradation would also be minimized. This project will develop technology for rendering the powdered carbon magnetic, so that it can be separated from the host ore after adsorption of the dissolved gold. In Phase I, samples of magnetic activated carbon will be prepared using various procedures and raw materials. The carbon samples will be evaluated for gold adsorption and magnetic characteristics. The results will be compared to current performance in existing gold operations to confirm the technical and economic viability of the process. Commercial Applications and Other Benefits as described by awardee: The new technique should provide a ten-fold improvement in the chemical separation process. The primary use for this technology is gold mining applications. Other commercially viable applications include improved purification of drinking water and treatment of contaminated ground water.