中国矿山工程

The research focuses on the inherent haracteristics of yrrhotite within magnetite-type copper ore and examines the unique eneficiation process applied for copper and iron recovery, comprising “semi-priority semi-mixed flotation for copper, regrinding of copper flotation tailings, magnetic separation for iron, and desulfurization flotation of iron concentrate.” It analyzes the fundamental reasons for the inhibition of pyrrhotite by lime. Through experimental investigations, an optimized reagent scheme for pyrrhotite flotation was developed. The experiments conclude that adjusting the flotation pulp to a pH of 5.2 with 2400g/t sulfuric acid and employing 200g/t copper sulfate as an activator for pyrrhotite effectively counteracts the inhibition by lime. By using B-45 as the collector and No. 2 oil as the frother, a five-stage open-circuit flotation yields a desulfurized iron concentrate with a sulfur grade of 0.23%, an iron grade of 65.34%, and an iron recovery rate of 83.22%.