abstract

• 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%25 and 50 to 73%25, respectively. The Au secondary encapsulation due to the sintering, the formation of the Ag-Fe-S species (Fe1−xS %2b Ag2S %2b Ag) and Ag ferrite in higher roasting temperatures hence Au and Ag recoveries decreased. © 2021. All Rights Reserved

authors

• Fang Y.
• López Valdivieso Alejandro
• Peng C.
• Robledo-Cabrera A.
• Yang K.

publication date

• 2021-01-01

funding provided via

• Consejo Nacional de Ciencia y Tecnología, CONACYT: 900333, 900347and 900339; Universidad Autónoma de San Luis Potosí, UASLP  Grant

published in

• Journal of Mining and Metallurgy, Section B: Metallurgy  Journal

keywords

• Cyanide leaching; Gold recovery; Gold refractory; Roasting; Silver recovery

Digital Object Identifier (DOI)

• 10.2298/JMMB200911019Z

PubMed ID

start page

• 235

end page

• 243

volume

• 57

issue

• 2