云南某铜冶炼渣浮铜试验

Research on Copper Recovery from a Copper Slag in Yunnan

云南某铜冶炼渣铜、铁含量较高,含铜0.62%、含铁35.58%,主要含铜矿物为黄铜矿、蓝铜矿和辉铜矿,铜矿物与主要脉石矿物橄榄石等嵌布关系复杂,嵌布粒度细微,属于难选二次铜资源。为了回收该二次资源中的铜,对选铜工艺进行了研究,确定的磨矿细度为-0.074 mm占96.50%,铜粗选丁铵黑药+丁基黄药用量为300+100g/t、Na2CO3用量为4 kg/t、冰铜用量为15 kg/t;采用1粗1扫2精、中矿顺序返回流程对试样进行选别,最终获得的铜精矿铜品位为21.30%、铜回收率为86.20%。试验研究表明,对这种微细粒嵌布的硫化铜矿物,以冰铜为"载体"进行"载体"浮选对获得理想的分选指标发挥了重要作用。

The slag stemmed from copper metallurgy with copper and iron content of O. 62% and 35.58% separately was from Yunnan province. Main copper minerals in the slag were chalcopyrite, azurite and chaleoeite. Copper minerals were finely disseminated and closed associated with olivine in the slag, which belongs to the refractory secondary copper re- source. Concentration process for copper recovery was conducted in order to recover copper from the slag. The optimum condi- tions are determined as the grinding fineness of 0. 074 mm 96.50% and butylamine dithiophosphate ＋ butyl xanthate, sodium carbonate, matte dosage of 300 ＋ 100 g/t,4 kg/t, 15 kg/t respectively. Copper concentrate with copper grade of 21.30% and copper recovery of 86.20% was obtained by adopting the closed circuit flotation process of one roughing-one scavenging-two cleanings, and middles back to the flow-sheet in turn. The test result showed that for this micro-finely disseminated copper sul- fide, matte as ＂carrier＂ in flotation plays an important role in getting an ideal flotation index.