广西某低品位铜镍矿石选矿工艺研究

Beneficiation Experiment on a Low-grade Copper-Nickel Ore from Guangxi

广西某低品位铜镍矿石含铜0.25%、含镍0.43%,镍主要以镍黄铁矿形式存在,铜主要以黄铜矿形式存在,铜、镍矿物均有一定程度氧化且关系密切。为了给该矿石的开发利用提供依据,对其进行了选矿工艺研究。通过对优先浮铜再浮镍方案、铜镍混合浮选方案、铜镍混合浮选再分离方案以及磁选—铜镍混合浮选方案的对比,决定采用铜镍混合浮选方案处理该矿石。按该方案进行详细的试验研究,结果表明,在-0.074 mm占74%的磨矿细度下,以碳酸钠为矿浆调整剂、丁黄药为捕收剂、2号油为起泡剂,经1粗选2扫选2精闭路浮选,可获得铜品位为5.77%、镍品位为8.31%、铜回收率为86.33%、镍回收率为76.60%的铜镍混合精矿。

A low-grade copper-nickel ore in Guangxi contains Cu of 0. 25% and Ni of 0. 43%. Nickel mainly exists in the form of pentlandite, while copper in the form of chalcopyrite. Both copper and nickel minerals have a certain degree of oxidation and are closely disseminated. In order to provide a basis for the development and utilization of the ore, beneficiation experiments were carried out. By process comparison of copper flotation and then nickel, copper-nickel bulk flotation, bulk flotation of copper-nickel and then separation, magnetic separation-copper-nickel bulk flotation, the copper-nickel bulk flotation process was chosen to deal with the ore. The research by the process indicated that copper-nickel mixed concentrate with copper grade and recovery of 5.77% and 86. 33 %, nickel grade and recovery of 8. 31% and 76. 60% respectively were obtained at the grinding fineness of 74% passing 0. 074mm, with sodium carbonate as regulator, butyl xanthate as collector, 2# oil as frother, through the process flowsheet of one roughing, two-cleaning, and two-scavenging.