云南某难选氧硫混合铜矿石的选矿试验研究

云南某铜矿石含铜1.02%,矿石中铜矿物种类复杂,结合率高,钙镁含量高,属典型的难选氧硫混合铜矿石。针对该矿石性质,对该铜矿石进行了详细的选冶试验研究:先将该铜矿强化浮选-反浮选脱钙镁,再将中矿进行加温强化浸出试验。最终确定了较佳的工艺条件为:经过一段磨矿,三次粗选,三次精选的闭路流程回收精矿,全中矿混合浸出,液固比3:1,矿浆温度70℃,搅拌速度300rpm,反应时间2h。研究结果表明,在此工艺条件下,采用混合浮选—强化捕收—反浮选脱钙镁—中矿加温浸出的选冶联合工艺可获得铜精矿品位10%左右,铜综合回收率大于70%,电解铜吨铜耗酸小于20t的技术经济指标。为该类铜矿石的分选提供一种新的途径。

Experimental Research on Beneficiation of a Refractory Oxygen and Sulfur Mixed Copper Ore

A copper ore in Yunnan contains 1.02%Cu with complex mineral composition,high oxidation ratio and high content of calcium and magnesium,belonging to a typical refractory mixed copper ore.Directed at the ore characteristics,detailed metallurgical experiments were carried on this ore.Firstly,the copper ore was carried on intensified flotation-reverse flotation removing calcium and magnesium and then the middling was carried on heating intensified leaching.Finally,the optimal technological condition was that the closed-circuit flowsheet of one-stage gringding,three roughing and three cleaning to recover concerntrate,the bulk leaching was adopted for the middling,the ratio of liquid to solid was 3∶1,the pulp temperature was 70℃,the stirring speed was 300r/min and the reaction time was 2h.The results showed that under this technological condition,when the combined technology of bulk flotation-reinforceful collection-reverse flotation removing calcium and magnesium-heating leaching of middling was adopted,the copper concentrate with a grade of 10% and the comprehensive recovery of copper of more than 70% was obtained.Moreover,the acid-consuming of per ton electrolytic copper was less than 20t.The economical index is satisfactory.This would benefit the exploitation of similar refractory copper ores.