金川硫化铜镍矿酸性介质中新型浮选药剂体系研究

Research on the Flotation Reagent Regime of Jinchuan Copper-Nickel Sulfide Ore in Acidic Medium

金川硫化铜镍矿含镁硅酸盐脉石含量高,泥化后通过异相凝聚和机械夹带影响精矿镍、铜金属的富集。相关研究与国外的工业实践证明,酸性介质浮选能促进含镁硅酸盐脉石的分解,显著提升硫化铜镍矿中有用矿物的回收,降低精矿氧化镁含量。但目前国内相关研究较少,缺乏与酸性介质浮选匹配的药剂体系。对此,以Ni品位0.42%、Cu品位0.32%的金川某生产车间二段浮选给矿为研究对象,研究了酸性介质中适合的新型药剂体系,并利用起泡剂测试装置对比分析了不同起泡剂的性能。试验结果表明,在pH值为4的酸性浮选条件下,以异丁基黄原酸钠为捕收剂、Z-200为辅助捕收剂和松油醇为起泡剂,经过一次粗选两次精选和两次扫选,可获得Ni回收率58.92%、Cu回收率45.60%、Ni品位3.54%和Cu品位2.03%的精矿产品。与现场药剂体系相比,精矿Ni、Cu回收率分别提高了7.54、24.40百分点,MgO含量降低了0.94百分点。新药剂体系全面提升了金川硫化铜镍矿资源综合利用率。

The content of magnesium silicate gangue minerals in Jinchuan sulfide copper-nickel ore is high.It affects the enrichment of nickel and copper in concentrates through heterogeneous condensation and mechanical entrainment after grinding.Related researches and foreign industrial practices have proved that acidic medium flotation can promote the decomposition of magnesium silicate gangue minerals,which significantly improved the recovery of useful minerals in copper-nickel sulfide ore and reduced the content of magnesium oxide in concentrates.At present,however,there are few researches on the suitable reagent system for the acidic medium flotation of sulfide minerals in China.To solve this issue,feed of the second stage processing production line of the third flotation plant of Jinchuan Group Co.(Ni and Cu grade of ore was 0.42%and 0.32%respectively)was regarded as the research object.The open circuit flotation tests studied the new reagent system suitable for the acid medium,and compared and analyzed the performance of different frothers by using the foam tester.Under acid flotation condition(pH value=4),with sodium isobutyl xanthanate(NaIBX)as the collector,O-isopropyl-N-ethylthiocarbamate(Z-200)as the co-collector and terpineol as the frother,after one roughing,two cleaning and two scavenging,the recovery of Ni and Cu are 58.92%,45.60%and the grade of Ni and Cu are 3.54%,2.03%respectively.Compared with comparative system(according with industrial process),the recovery of Ni and Cu are increased by 7.54%,24.40%and the grade of Cu is increased by 0.70%.The new reagent system significantly improved the comprehensive utilization rate of copper-nickel sulfide resources in Jinchuan.