某铜矿提铜降硅试验研究

Experimental study on copper recovery and silicon reduction in a copper ore

某铜矿经选别后所得铜精矿含SiO_(2)约26%,SiO_(2)品位过高会增加后续冶炼成本,但提高铜品位、降低SiO_(2)品位可能会降低铜回收率。为了能够更好地提铜降硅,开展了试验研究。结果表明:随着再磨细度的提高,SiO_(2)品位呈下降趋势,铜品位呈上升趋势,铜回收率呈先上升后趋于平稳趋势;在磨矿细度-0.074 mm占75%,再磨细度-0.023 mm占85%条件下,采用一粗二扫三精的闭路试验流程,可获得铜品位23.40%,含SiO_(2 ) 12.40%,铜回收率89.42%的铜精矿。

The copper concentrate obtained after separation of a copper ore approximately contains 26%SiO_(2),and an excessive SiO_(2) content can increase subsequent smelting costs.However,increasing the copper grade and reducing the SiO_(2) content may lower the copper recovery rate.In order to better recover copper and reduce silicon content,experimental research was conducted.The results show that with the increase in regrinding fineness,the SiO_(2) content decreases,the copper grade increases,and the copper recovery rate first rises and then tends to stabilize.Under the conditions of grinding fineness-0.074 mm accounting for 75%and regrinding fineness-0.023 mm accounting for 85%,adopting a closed-circuit test process of one roughing,three cleaning,and three scavenging,a copper concentrate with a grade of 23.40%and SiO_(2) content of 12.40%was obtained,with a copper recovery rate of 89.42%.