Share This Article:

New Approach for Lead, Zinc and Copper Ions Elimination in Cyanidation Process to Improve the Quality of the Precipitate

Abstract Full-Text HTML XML Download Download as PDF (Size:5926KB) PP. 117-129
DOI: 10.4236/msa.2015.62015    4,975 Downloads   5,477 Views   Citations

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 México.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Parga, J. , Valdés, J. , Valenzuela, J. , Gonzalez, G. , de J. Pérez, L. and Cepeda, T. (2015) New Approach for Lead, Zinc and Copper Ions Elimination in Cyanidation Process to Improve the Quality of the Precipitate. Materials Sciences and Applications, 6, 117-129. doi: 10.4236/msa.2015.62015.

References

[1] Lewis, A.E. (2010) Review of Metal Sulphide Precipitation. Hydrometallurgy, 104, 222-234.
http://dx.doi.org/10.1016/j.hydromet.2010.06.010
[2] Habashi, F. (1987) One Hundred Years of Cyanidation Historical Note. CIM Bulletin, 30, 108-114.
[3] Parga, J.R., Valenzuela, J.L. and Cepeda, F. (2007) Pressure Cyanide Leaching for Precious Metals Recovery. Journal of Metals, 59, 43-47.
[4] Hedjazi, F. and Monhemius, J. (2014) 64 Copper-Gold Ore Processing with Ion Exchange and SART Technology. Minerals Engineering, 64, 120-125.
http://dx.doi.org/10.1016/j.mineng.2014.05.025
[5] Dai, X. and Jeffrey, M.I. (2006) The Effect of Sulfide Minerals on the Leaching of Gold in Aeratedcyanide Solutions. Hydrometallurgy, 82, 118-125.
http://dx.doi.org/10.1016/j.hydromet.2006.03.005
[6] Parga, J.R., Casillas, H.M., Vazquez, V. and Valenzuela, J.L. (2009) Cyanide Detoxification of Mining Wastewaters with TiO2 Nanoparticles and Its Recovery by Electrocoagulation. Chemical Engineering and Technology, 32, 1901-1908.
http://dx.doi.org/10.1002/ceat.200900177
[7] Adams, M., Lawrence, R. and Bratty, M. (2008) Biogenic Sulphide for Cyanide Recycle and Copper Recovery in Gold-Copper Ore Processing. Minerals Engineering, 21, 509-517.
http://dx.doi.org/10.1016/j.mineng.2008.02.001
[8] Dybowska, A. and Woodgate, S. (2009) An Evaluation of the Reactivity of Synthetic and Natural Apatites in the Presence of Aqueous Metals. Science Total Environmental, 407, 2953-2965.
http://dx.doi.org/10.1016/j.scitotenv.2008.12.053
[9] Mping, C.N., Bradshaw, S.M., Akdogan, G., Snyders, C.A. and Eksteen, J.J. (2013) Evaluation of the Merril-Crowe process for the Simultaneous Removal of Platinum, Palladium and Gold from Cyanide Leach Solutions. Hydrometallurgy, 142, 36-46.
http://dx.doi.org/10.1016/j.hydromet.2013.11.004
[10] Lawr, C.W. (1929) Cyanide Regeneration as Practiced by Compañia Beneficiadora de Pachuca. England Patent No. 241669.
[11] Smith, A. and Mudder, T. (1991) The Chemistry and Treatment of Cyanidation Wastes. Mining Journal Books Limited, London.
[12] Muir, D.M. (2011) A Review of the Selective Leaching of Gold from Oxidised Copper-Gold Ores with Ammonia-Cyanide and New Insights for Plant Control and Operation. Minerals Engineering, 24, 576-582.
http://dx.doi.org/10.1016/j.mineng.2010.08.022
[13] Kong, J.J., Yue, Q., Sun, S., Gao, B., Kan, Y., Li, Q. and Wang, Y. (2013) Adsorption of Pb(II) from Aqueous Solution Using Keratin Waste-Hide Waste: Equilibrium, Kinetic and Thermodynamic Modeling Studies. Chemical Engineering Journal, 241, 393-400.
http://dx.doi.org/10.1016/j.cej.2013.10.070
[14] Yan, Y., Dong, X., Sun, X., Sun, X., Li, J., Shen, J., Han, W., Liu, X. and Wang, L. (2014) Conversion of Waste FGD Gypsum into Hydroxyapatite for Removal of Pb2+ and Cd2+ from Wastewater. Journal of Colloid Interface Science, 429, 68-76.
http://dx.doi.org/10.1016/j.jcis.2014.05.010

  
comments powered by Disqus

Copyright © 2018 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.