PARRA, R.; WILKOMIRKSY, I.; PARADA, F.; BALLADARES, E.:
CIMM Conference. 108-112 (2011).
In most of the smelters, the management of the flue dust has a double objetive: the control of minor elements in the anodes and management of volatiles compounds that can cause contamination due to fugitive gas emissions. This is a special concern when high contents of VA elements (As, Sb & Bi) are present in concentrates. We present the results of the experimental study to prove the principle of a novel process that recovers, via volatilization, the As, Sb and Bi in the flue dust as gaseous sulfides, due to a previous sulfidization. In the case of As control any further classical treatment for its stabilization is possible from the gas. The clean calcine can be returned to the smelter avoiding any concentration of these minor elements in the circuit. This process in now tested at pilot scale and shows better indices on carbon footprint than the classical hydrometallurgical process for the flue dust.