TY - JOUR T2 - Journal of Mining and Metallurgy, Section B: Metallurgy TI - Roasting temperature effect on the recovery of refractory gold and silver in pyrite concentrates VL - 57 IS - 2 SP - 235 EP - 243 PY - 2021 DA - 18 February 2021 DO - 10.2298/JMMB200911019Z UR - https://doi.org/10.2298/JMMB200911019Z AU - Zhang, Y.-P. AU - Yang, K. AU - Fang, Y. AU - Robledo-Cabrera, A. AU - Peng, C.-S. AU - Lopez-Valdivieso, A. AD - a Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico; b School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing, China; AB - Pyrite concentrates with refractory gold and silver were roasted at different temperatures to improve the recovery of the metals by cyanide leaching. Scanning Electron Microscope characterization of the calcine revealed that the gold occluded in the pyrite less than one micron, and roasting produced channels in the concentrate, exposing the gold particles to the leaching solution. Gold and silver recoveries were maximum in the temperature range of 500-600°C due to the calcine high surface area and porosity. The Au and Ag recovery improved from 25 to 86% and 50 to 73%, respectively. The Au secondary encapsulation due to the sintering, the formation of the Ag-Fe-S species (Fe1-xS + Ag2S + Ag) and Ag ferrite in higher roasting temperatures hence Au and Ag recoveries decreased. KW - Gold recovery KW - Silver recovery KW - Roasting KW - Gold refractory KW - Cyanide leaching N1 - Correspondence Address: A. Lopez-Valdivieso *; C.-S. Peng **; a Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico; b School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing, China; email: alopez@uaslp.mx *; cspeng@ouc.edu.cn **; N1 - J. Min. Metall. Sect. B-Metall., 57 (2) (2021) 235-243. doi:10.2298/JMMB200911019Z PB - Technical Faculty in Bor SN - 1450-5339 (ISSN) LA - English J2 - J. Min. Metall. Sect. B Metall. M3 - Article ER -