GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES USING DIRECT CYANIDE LEACHING WITH NITRITE AS AN OXIDANT
DOI:
https://doi.org/10.30556/imj.Vol19.No3.2016.541Keywords:
refractory gold ore, leaching, cyanide, nitrite, oxidantAbstract
The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a 2.5-liter glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the prescribed concentration of reagents. Recovery of gold increased gradually to its maximum value of 93.05% as the value of cyanide strength increased from 0.8 to 1.2% and the addition of sodium nitrite raise to 1.2 M. No improvement for further addition of nitrites. This introduction of new hydrometallurgical pre-treatment process has given more option for treating refractory ores.References
Anderson, C. G. (2008) ‘NSC pressure leaching: industrial and potential applications’, in Young, C. A. et al. (eds) Hydrometallurgy 2008: Proceedings of the Sixth International Symposium. Society for Mining, Metallurgy, and Exploration, Inc., pp. 858–884.
Anonymous (2012) ‘Recovering refractory resources’, www.miningmagazine.com, September, pp. 148–160.
Asamoah, R., Amankwah, R. K. and Addai-Mensah, J. (2014) ‘Cyanidation of refractory gold ores: A review’, in 3rd UMaT Biennial International Mining and Mineral Conference. Tarkwa, Ghana, pp. 204–212. doi: 10.13140/2.1.4772.6407.
Badri, R. and Zamankhan, P. (2013) ‘Sulphidic refractory gold ore pre-treatment by selective and bulk flotation methods’, Advanced Powder Technology, 24(2), pp. 512–519. doi: 10.1016/j.apt.2012.10.002.
Breuer, P. (2015) ‘Dealing with copper gold ores: Implemented and future approaches’, in ALTA-2015 Gold Precious Metals Proceedings. Melbourne, Australia: ALTA Metallurgical Services Publications, pp. 2–20.
Carrillo-Pedroza, F. R. et al. (2012) ‘Oxidative Hydrometallurgy of Sulphide Minerals’, in Nusheh, M., Ahuett, H. G., and Arrambide, A. (eds) Recent Researches in Metallurgical Engineering - From Extraction to Forming. InTech, pp. 25–40. doi: 10.5772/36107.
Faraz, S. et al. (2014) ‘Improved recovery of a low-grade refractory gold ore using flotation–preoxidation–cyanidation methods’, International Journal of Mining Science and Technology, 24(4), pp. 537–542. doi: 10.1016/j.ijmst.2014.05.018.
Gok, O. (2010) ‘Oxidative leaching of sulfide ores with the participation of nitrogen species - A review’, Journal of Ore Dressing, pp. 22–29.
Gökelma, M. et al. (2016) ‘A review on alternative gold recovery re-agents to cyanide’, Journal of Materials Science and Chemical Engineering, 4(8), pp. 8–17. doi: 10.4236/msce.2016.48002.
Hasab, M. G., Rashchi, F. and Raygan, S. (2013) ‘Simultaneous sulfide oxidation and gold leaching of a refractory gold concentrate by chloride–hypochlorite solution’, Minerals Engineering, 50–51, pp. 140–142. doi: 10.1016/j.mineng.2012.08.011.
Hu, S. R., Wang, C. and Wei, Q. F. (2012) ‘The oxidation pretreatment of a sulfidic refractory gold ore with pyrolusite’, Advanced Materials Research, 550–553, pp. 2891–2894. doi: 10.4028/www.scientific.net/AMR.550-553.2891.
Khoshnevisana, A. and Yoozbashizadeha, H. (2012) ‘Determination of optimal conditions for pressure oxidative leaching of sarcheshmeh molybdenite concentrate using Taguchi method’, Journal of Mining and Metallurgy, Section B: Metallurgy, 48(1), pp. 89–99. doi: 10.2298/JMMB110308003K.
Li, D.-X. (2009) ‘Developments in the pretreatment of refractory gold minerals by nitric acid’, in World Gold Conference 2009. The Southern African Institute of Mining and Metallurgy, pp. 145–150.
Li, J. et al. (2006) ‘The influence of pyrite pre-oxidation on gold recovery by cyanidation’, Minerals Engineering, 19(9), pp. 883–895. doi: 10.1016/j.mineng.2005.09.052.
Marchevsky, N. et al. (2013) ‘Recovery of zinc during the pre-treatment of a refractory gold-bearing ore’, Advanced Materials Research, 825, pp. 431–434. doi: 10.4028/www.scientific.net/AMR.825.431.
Marsden, J. O. and House, C. I. (2009) The chemistry of gold extraction. 2nd Editio. Society for Mining, Metallurgy, and Exploration, Inc.
McHugh, L. F., Balliett, R. and Mozolic, J. A. (2008) ‘The sulfide ore looping oxidation process: An alternative to current roasting and smelting practice’, JOM, 60(7), pp. 84–87. doi: 10.1007/s11837-008-0097-9.
Mesa Espitia, S. L. and Lapidus, G. T. (2015) ‘Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion’, Hydrometallurgy, 153, pp. 106–113. doi: 10.1016/j.hydromet.2015.02.013.
De Michelis, I. et al. (2013) ‘Roasting and chlorine leaching of gold-bearing refractory concentrate: Experimental and process analysis’, International Journal of Mining Science and Technology, 23(5), pp. 709–715. doi: 10.1016/j.ijmst.2013.08.015.
Muravyov, M. I., Fomchenko, N. V. and Kondrat’eva, T. F. (2015) ‘Investigation of steps of ferric leaching and biooxidation at the recovery of gold from sulfide concentrate’, Applied Biochemistry and Microbiology, 51(1), pp. 75–82. doi: 10.1134/S0003683815010111.
Valenzuela, A., Valenzuela, J. L. and Parga, J. R. (2013) ‘Effect of pretreatment of sulfide refractory concentrate with sodium hypochlorite, followed by extraction of gold by pressure cyanidation, on gold removal’, Advances in Chemical Engineering and Science, 3(3), pp. 171–177. doi: 10.4236/aces.2013.33021.
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