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Advances on Recovery of Precious Metals by Using Merrill Crowe and Electrocoagulation Technology

Research Article

Article Title: Advances on Recovery of Precious Metals by Using Merrill Crowe and Electrocoagulation Technology

Author: José Refugio Parga Torres*, Esteban Sánchez Valdés, Francisco Cepeda Rodríguez and Víctor Vázquez Vázquez

Published Date: January 09, 2026

DOI: 10.26717/BJSTR.2026.64.010039

Abstract:

The recovery of precious metals by cementation reactions are used extensively in extractive metallurgy processes where the removal of more noble ions from cyanide solutions is desired. Even through the reactions may be written in very simple terms, the actual process of the electrochemical reduction cementation is often found to be very complex. Recovery by Electrocoagulation technology for precious metals and heavy toxic metals have progressed in line with new novel techniques in this century, while the classical treatment Merrill Crowe zinc dust electrochemical process remains essential for profitable production of gold and silver production. Actually, the EC process provide excellent results when applied to very low concentrations cyanide ions of precious metals and also when the rich cyanide solution contains complex cyanide ions of copper. In this research basic studies have been conducted on the kinetic cementation of gold / silver the results showing the reaction to be the first order reaction and diffusion controlled. In this research X-ray Diffraction, Scanning Electronic Microscope and Atomic Adsorption were used to characterize the solid products formed during the EC process. The results suggest that magnetite particles and amorphous iron oxyhydroxides are present (Lepidocrocite and Gohetite). The EC products recover gold and silver from cyanide solutions within 10 minutes and recoveries of gold and silver 98 % and simultaneously in a hermetic reactor the recovery of sodium cyanide was 95%. Finally, the Dore product has 96% pure and this a precursor to make superconductors.

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