Abstract
The Merrill-Crowe zinc-precipitation process has been applied worldwide on a large number of operations for recovering gold and silver from cyanide solutions. However, in some of the large plants this precipitate is of low quality, because copper and especially lead are precipitated along with gold and silver resulting in a higher consumption of zinc powder, fluxes in the smelting of the precipitate, formation of mate and short life for crucibles. In this research, a method is proposed to recover lead, zinc and copper cyanide ions from barren solutions, from the Merrill-Crowe process with hydroxyapatite before the filter press. This technology is based on inducing nucleated precipitation of zinc, copper and silver ions in a serpentine reactor, using sodium sulfide as the precipitator and sulfuric acid for pH control. This procedure was successfully applied at WILLIAM Mining and BACIS Mining Group in Mexico.
Highlights
Cyanidation of gold and silver ores is a complex heterogeneous process, where the leaching behavior of gold depends upon the nature of the gold and silver bearer as well of its distribution within the ore with respect to itsHow to cite this paper: Parga, J.R., Valdés, J.V., Valenzuela, J.L., Gonzalez, G., Pérez, L.M.J. and Cepeda, T.F. (2015) New Approach for Lead, Zinc and Copper Ions Elimination in Cyanidation Process to Improve the Quality of the Precipitate
The experiments were carried out on barren cyanide solution generated by the filter press on the Merrill-Crowe process
Copper precipitation and cyanide regeneration experiments were performed to determine the effect of different process conditions on the solids of copper/silver sulphide produced by sulphide precipitation
Summary
Cyanidation of gold and silver ores is a complex heterogeneous process, where the leaching behavior of gold depends upon the nature of the gold and silver bearer as well of its distribution within the ore with respect to itsHow to cite this paper: Parga, J.R., Valdés, J.V., Valenzuela, J.L., Gonzalez, G., Pérez, L.M.J. and Cepeda, T.F. (2015) New Approach for Lead, Zinc and Copper Ions Elimination in Cyanidation Process to Improve the Quality of the Precipitate. Cyanidation of gold and silver ores is a complex heterogeneous process, where the leaching behavior of gold depends upon the nature of the gold and silver bearer as well of its distribution within the ore with respect to its. (2015) New Approach for Lead, Zinc and Copper Ions Elimination in Cyanidation Process to Improve the Quality of the Precipitate. It depends on the quality of the gold surface exposed to cyanide. Cyanidation, a chemical process for gold dissolution, was introduced about 1890 in New Zealand and South Africa. It replaced the chlorination method, which had been in use [1] [2]
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