提高老挝难选玄武岩氧硫混合铜矿回收率试验

铜矿资源是世界各国国家安全与经济发展的物质基础,随着经济的飞速发展,对铜资源需求量越来越大,但易选的硫化铜矿石资源逐渐消耗殆尽,因此,氧化铜矿和氧硫混合铜矿的开发和利用成为必然。老挝蚀变玄武岩氧硫混合铜矿,含铜1.00%,氧化率17.60%,其中结合氧化铜占5.60%。工艺矿物学研究表明,该矿具有矿物组成复杂、粒度嵌布细且不均匀、解离不完全等特点。基于选厂的实际考察及工艺矿物学特性,研究分析了磨矿细度、药剂用量、选别流程等对铜回收率指标的影响。试验采用硫氧混合粗扫选—粗精矿集中两次精选—中矿再磨再选流程,其结果表明在-44μm粒级含量占95%的磨矿条件及最佳药剂用量条件下,获得了两种铜精矿;其中精矿1,铜品位为4.23%,铜回收率为3.63%;铜精矿2,铜品位为19.38%,铜回收率为71.56%,合并后铜精矿铜品位为16.52%,铜回收率为75.19%。

Test on improving recovery rate of Laos refractory basalt oxygen and sulfur mixed copper ore

Copper resources are the material basis of national security and economic development in all countries in the world. With the increasing demand for copper in the world, the primary copper sulfide ore resources that are easy to be mined and prepared are gradually exhausted, and the development and utilization of oxidized copper ore and copper sulfide ore become inevitable. For the Laotian altered basalt oxy-sulfur mixed copper mine, the content of copper is 1.00%, the oxidation rate is 17.60%, among which the combined copper oxide accounts for 5.60%. The study of process mineralogy shows that the ore has the characteristics of complex mineral composition, fine and uneven grain size and incomplete dissociation. Based on the actual investigation of the concentrator and the study of the process mineralogy characteristics, the main factors influencing the concentration index are the grinding fineness and the reasonable reagent system. The closed-circuit test results show that two kinds of copper concentrate have been obtained under the condition of fine grinding and reasonable dosage. Among them, the grade of 1Cu concentrate is 4.23%, the recovery rate of Cu is 3.63%, the grade of 2Cu concentrate is 19.38%, the recovery rate of Cu is 71.56%, and the combined grade of Cu concentrate is 16.52%, the recovery rate of Cu is 75.19%.