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Copper Recovery from Barren Cyanide Solution by Using Electrocoagulation Iron Process

Advances in Chemical Engineering and Science 2013年第2期3卷 150-156页

作者： José R. Parga Guillermo Tiburcio Munive Jesús L. Valenzuela Víctor V. Vazquez gregorio gonzález zamarripa Institute Technology of Saltillo Saltillo Mexico

This paper is a brief overview of the role of inducing the nucleated electro winning of copper by using iron electrodes in electrocoagulation (EC) process. Cyanide compounds are widely used in gold ore processing plants in order to facilitate the extraction and subsequent concentration of the precious metal. Owing to cyanide solution employed in gold processing, effluents generated have high contents of free cyanide as well as copper cyanide complexes, which lend them a high degree of toxicity. In this regard, two options for the treatment of cyanide barren solutions has been used;in two ways;first for cyanide destruction by oxidation with the use of the EC process, in theory, has the advantage of decomposing cyanide at the anode and collecting copper simultaneously by a sludge of copper magnetic iron. In both cases excellent performance can be achieved using the high capacity of the bipolar iron EC technology. We found that it is possible to reduce the copper cyanide complex from 720 mg·l-1 to below 10 mg·l-1 within 20 minutes.

关键词： Copper Recovery Electrocoagulation Process Bipolar Iron Electrodes Cyanide

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Kinetic Aspects of Gold and Silver Recovery in Cementation with Zinc Power and Electrocoagulation Iron Process

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Advances in Chemical Engineering and Science 2012年第3期2卷 342-349页

作者： Gabriela V. Figueroa Martinez José R. Parga Torres Jesús L. Valenzuela García Guillermo C. Tiburcio Munive gregorio gonzález zamarripa Department of Chemical Engineering and Metallurgy University of Sonora Hermosillo México Department of Metallurgy and Materials Science Institute of Technology of Saltillo Saltillo México

The Merrill-Crowe or Cementation process is used for concentration and purification of gold and silver from cyanide solutions. Among other available options for recovery of precious metals from cyanide solutions, Electrocoagulation (EC) is a very promising electrochemical technique for the recovery of this precious metals. In this work first, an introduction to the fundamentals of the Merrill Crowe and EC process are given, then Kinetic aspects conditions and results of the both process, for the removal of gold and silver from cyanide solutions are presented, and finally the characterization of the solid products formed during the EC process with X-ray Diffraction and SEM are shown. Results suggests that The cementation of both gold and silver by suspended zinc particles conforms to well-behaved fist order kinetics and for the EC process the results show that is an excellent option to remove Au and Ag from cyanide solution by using iron electrodes. Finally, 99.5% of gold and silver were removed in the experimental EC reactor, and it was achieved in 5 minutes or less.

关键词： Cyanidation Merrill Crowe Electrocoagulation Kinetics

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