Abstract:Taking antimony gold concentrate and lead concentrate as the research object, thermodynamic software FactSage was used to calculate the reaction trend of various metal sulfides, the dominant region map of Me-S-O diagrams, and the distribution rule of phase equilibrium in synergistic smelting process. The thermodynamic analysis shows that the synergistic smelting process can be located in the thermodynamically stable region of Pb(l)+Sb(l) by controlling the appropriate partial pressure of oxygen and partial pressure of sulfur. The interaction between Sb2O5 and PbS in synergistic smelting process leads to the formation of metal Pb and Sb is significant, which is conducive to the recovery of Sb and the capture of Au during smelting. The verification test shows that under the conditions of melting temperature of 1 200 ℃, CaO/SiO2=0.40, Fe/SiO2=1.05 and oxygen enrichment concentration of 90%, the synergistic smelting process of antimony gold concentrate and lead concentrate can be carried out smoothly, the yield of Pb and Sb in alloy is more than 88%, and the content of Pb and Sb in slag is less than 1%, and the content of Au in alloy is 78 g/t.