Resumo

PARGA-TORRES, J.R. et al. Adsorption of gold and silver on magnetic species formed during the electrocoagulation process. RIIIT. Rev. int. investig. innov. tecnol. [online]. 2018, vol.5, n.30. ISSN 2007-9753.

In metallurgical operations, most used processes for gold and silver recovery of minerals are Activated Carbon in pulp, Merril Crowe and Ion Exchange Resins, which are generally used for concentration and purification of gold and silver from cyanide solutions. Among several options available for recovery of precious metals from cyanide solutions, Electrocoagulation (EC) is a very promising electrochemical treatment technique that does not require high concentrations of gold and silver in cyanide solutions. First, this study will provide an introduction to the fundamental concepts of the EC method for recovery of precious metals from cyanide solutions. In this research, Powder X-ray Diffraction, Scanning Electron Microscopy and Transmission Mossbauer Spectroscopy were used to characterize the solid products formed at iron electrodes during the EC process. The results suggest that magnetite particles and amorphous iron oxyhydroxides present in the EC products remove gold and silver in 5 minutes with an efficiency of more than 99 % from cyanide impregnated solutions. These results were applied to the Mexican mining companies: Grupo Minero Bacis, Minera Williams and Minera Avino, samples of these three, showed recovery of gold and silver higher than 99%.

Palavras-chave : Cyanidation; Electrocoagulation; recovery of gold and silver.

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