中国有色冶金

At present, it is difficult to treat fine-grained low-gold and high-sulfur gold ores, silicate-coated gold ores and other refractory gold ores. In the literature, the pyrometallurgical smelting of copper-containing materials is mostly used, and the comprehensive recovery of valuable metals in the ore is realized by using the capture capacity of matte relative to precious metals, However, the actual production will be limited by the supply of copper smelting raw materials. Therefore, in this paper, a low-copper refractory gold mine abroad is used as the raw material, without adding copper-containing materials, and gold is captured by low-copper grade matte. The equilibrium separation relationship between FeS and Iron olivine slag was investigated by FactSage software, The effects of temperature and slag type on metal recovery rate were investigated by single factor test, and the following main conclusions were obtained. Factsage analysis shows that in the FeS-FeO-SiO₂ system at 1300℃, the two-phase separation of matte phase and iron-silicon slag can be achieved by controlling the type of smelting slag, even if the matte phase contains very low copper or does not contain copper. Under the conditions of temperature of 1300℃, holding time of 60min, Fe/SiO₂=1.3, CaO/SiO₂=0.2, the matte phase gold and copper grades were 34.4g/t and 2.98%, respectively, and the gold and copper recovery rates were 96.8% and 92.3%, respectively. In terms of phase composition, the matte phase is mainly composed of four phases: fayalite, magnetic iron, ferrous sulfide and polymetallic alloy. The associated elements such as arsenic, antimony and nickel in gold and ore are highly enriched in the alloy phase of copper matte.