提高德兴铜矿泗洲选矿厂铜回收率的途径

Approach for Improving the Copper Flotation Recoveries of Sizhou Plant in Dexing Copper Mine

针对德兴铜矿低品位矿石(铜品位0.31%)难磨难选的特点,在矿石性质分析的基础上开展了浮选试验研究。矿石黄铜矿主要呈浸染状分布,部分呈细小粒状分布于脉石中或被脉石包裹,少量黄铜矿与黄铁矿毗邻嵌布。全流程闭路浮选结果表明,在磨矿细度为-0.074 mm占61.60%,粗选石灰调矿浆pH值为8.0时,以Mac-12+丁黄药为捕收剂,经1粗2扫铜硫混合浮选,粗精矿再磨至-0.037 mm占68%,经1粗2精2扫铜硫分离浮选,获得的铜精矿铜回收率和品位分别为85.56%、27.27%,较现场当班铜精矿铜品位提高了1.68个百分点,铜回收率提高了3.95个百分点。提高矿浆pH值或优化捕收剂配比可改善粗选泡沫结构,提高浮选指标。

Aiming at the characteristics of refractory copper ore(copper grade is 0.31%)in Dexing Copper Mine,flotation experiment was conducted based on the analysis of ore property. The chalcopyrite is mainly disseminated distributed in the ore,and some of it is distributed as fine granule in the gangue or wrapped by gangue. A small amount of chalcopyrite and pyrite are adjacent to each other. Whole flow of closed circuit flotation results show that at the grinding fineness of 61.60%passing 0.074 mm,lime regulating slurry pH value of 8.0,using Mac-12 + butyl xanthate as collector,via one roughing two scavenging copper flotation,rough concentrate reground to 68% passing 0.037 mm,via one roughing two cleaning two scavenging copper flotation,copper concentrate with copper grade of 27.27% and recovery of 85.56% was obtained,copper grade and recovery increased by 1.68 and 3.95 percentage points respectively. Increase pulp pH or optimize collector mass ratio can improve foaming structure,increase flotation index.