江西某铜选矿厂选铜工艺优化

江西某大型铜矿山受入选矿石嵌布粒度变细、嵌布关系变复杂、铜氧化率升高的影响,选矿生产指标不断下滑。为解决现场工艺流程的不适应问题,按较粗磨矿细度下部分优先浮铜—铜硫浮选—铜硫混合产品再磨后分离流程进行了选矿试验。结果表明,在一段磨矿细度为-0.074 mm占68%的情况下,采用1粗1精快速优先浮铜、1粗1扫铜硫混浮、优先浮铜中矿与混浮粗精矿合并再磨至-0.074 mm占98.07%后,再1粗1精1扫铜硫分离、铜硫分离中矿集中返回再磨的闭路流程处理该矿石,最终获得了铜品位为22.79%、铜回收率为86.04%的铜精矿,以及硫品位为43.86%、回收率为58.73%的硫精矿。该铜精矿品位和回收率较现场生产指标分别提高了1.46、3.60个百分点,指标改善显著。

Optimization of Copper Beneficiation for a Copper Dressing Plant in Jiangxi

Under the influences of fine and complicated dissemination,high rate of copper oxidation of the ore,the production indexes in a large copper mine in Jiangxi constantly keeps falling. In order to solve the problems existing in on-site process,beneficiation tests were carried out by the process of partially preferential copper flotation Cu-S bulk flotation at coarser grinding fineness,separation of copper and sulphur for regrinding of Cu-S bulk flotation products. The experiment result indicated that with the one-stage grinding fineness of 68% -0.074 mm,copper concentrate with copper grade of 22.79% and copper recovery rate of 86.04%,and sulphur concentrate with sulphur grade of 43.86% and sulphur recovery rate of 58.73% were gained respectively by adopting the closed-circuit process of fast preferential copper flotation by one roughing and one cleaning,sulphur-copper bulk flotation by one roughing and one scavenging,separation of copper and sulphur by one roughing,one cleaning and one scavenging after regrinding mixed concentrates of the middling of preferential copper flotation and the primary concentrate of the bulk flotation to 98.07% -0.074 mm,and middles back to the regrinding. Compared with the production indexes,the copper grade of the copper concentrate was increased by 1.46 percentage points,and the copper recovery rate was increased by 3.60 percentage points,so the indexes were improved significantly.