Abstract
Copper concentrates with high arsenic contents must be pretreated before conventional smelting to prevent environmental pollution with arsenic compounds. In this work, experimental results concerning the selective removal of arsenic and antimony from copper concentrates are presented. The process consists of an alkaline digestion using concentrated NaHS-NaOH solutions to transform the arsenic and antimony sulfides into soluble compounds. A water leaching follows the digestion to dissolve the arsenic and antimony, leaving clean copper sulfide solid residues. The laboratory scale tests were carried out using a copper-arsenic concentrate with 15.05% As and 1.42% Sb. The results showed that the most important digestion variables were temperature and concentrations of NaHS and NaOH. Over 97% of arsenic and 92% of antimony could be removed in 10 min of digestion using 8.9 M NaOH and 100% excess of NaHS at 80 °C. The subsequent water leaching was performed at 80°C for 20 min.
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References
K. Baxter, H. Scriba and I. Vega, “Treatment of high-arsenic copper-gold concentrates — An options review,” Proceedings of Copper 2010, ed. GDMB (Clausthal-Zellerfeld, Germany: Society for Mining, Metallurgy, Resources and Environmental Technology, 2010), 1783–1802.
M.C. Ruiz, R. Bello and R. Padilla, “Removal of arsenic from enargite rich copper concentrates,” Materials Processing Fundamentals, ed. L. Zhan A. Allanore, J.A. Yurko and J. Crapps (Hovoken, NJ: John Wiley & Sons, 2013), 217–223.
R.M. Nadkarni and C.L. Kusic, “Hydrometallurgical removal of arsenic from copper concentrates,” Arsenic Metallurgy, Fundamentals and Applications, ed. R.G. Reddy, J.L. Hendrix and P.B. Queneau (Warrendale, PA: The Minerals Metals and Materials Society, 1988), 263–286.
C.G Anderson and L.G. Twidwell, “The alkaline sulfide hydrometallurgical separation, recovery and fixation of tin, arsenic, antimony, mercury and gold,” Lead and Zinc 2008 (Johannesburg, South Africa: The Southern African Institute of Mining and Metallurgy, 2008), 121–132.
L. Currelli, C. Garbarino, M. Ghiani and G. Orrù, “Arsenic leaching from a gold bearing enargite flotation concentrate,” Hydrometallurgy, 96 (2009), 258–263.
D. Filippou, P. St-Germain, T. Grammatikopoulos, “Recovery of metal values from copper arsenic minerals and other related resources,” Mineral Processing and Extractive Metallurgy Review, 28 (2007), 247–298.
S.A. Awe, C. Samuelson and A. Sandström, “Dissolution kinetics of tetrahedrite mineral in alkaline sulphide media,” Hydrometallurgy, 103 (2010), 167–172.
W. Tongamp, Y. Takasaki and A. Shibayama, “Selective leaching of arsenic from enargite in NaHS-NaOH media,” Hydrometallurgy, 101 (2010), 64–68.
M.C. Ruiz, L. Grandon and R. Padilla, “Selective arsenic removal from enargite by alkaline digestion and water leaching,” Hydrometallurgy, 150 (2014), 20–26.
W. Tongamp, Y. Takasaki and A. Shibayama, “Arsenic removal from copper ores and concentrates through alkaline leaching in NaHS media,” Hydrometallurgy, 98 (2009), 213–218.
F. Parada, M.I. Jeffreys and E. Asselin, “Leaching kinetics of enargite in alkaline sodium sulphide solutions,” Hydrometallurgy, 146 (2014), 48–58.
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Ruiz, M.C., Daroch, F., Padilla, R. (2015). Arsenic and Antimony Removal from Copper Concentrates by Digestion with NaHS-NaOH. In: Yurko, J.A., et al. EPD Congress 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48214-9_1
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DOI: https://doi.org/10.1007/978-3-319-48214-9_1
Publisher Name: Springer, Cham
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