广东某含硫铁低品位铜矿石选矿工艺研究

广东某含硫铁低品位铜矿石主要有用元素铜、硫、铁品位分别为0.51%、27.68%、34.07%。铜赋存状态复杂，以次生硫化铜形式存在的铜占总铜的54.91%，水溶性铜占总铜的26.39%，采用常规浮选方法选别铜回收率低。为探索该矿石中铜、硫、铁的高效分选工艺，对其进行了选冶工艺研究。结果表明：原矿磨细至-0.074 mm占72%时，采用pH=3的硫酸溶液为浸出剂，在液固比为4 mL/g、搅拌转速为1 400 r/min、浸出时间为24 h条件下浸铜，可以获得铜浸出率为93.33%的指标；铜浸渣经自来水搅拌洗涤至pH=6以后，以丁黄药为捕收剂、2号油为起泡剂，经1粗1扫硫浮选，可获得硫品位为48.44%、对铜浸渣回收率为95.57%的高品质硫精矿；浮硫尾矿在磁介质为Φ2 mm棒介质、脉动冲程为16 mm、冲次为280次/min、背景磁感应强度为0.6 T条件下，经1次高梯度强磁选选铁，可获得铁品位为51.42%、对铜浸渣回收率为17.02%的铁精矿。以上试验结果说明，采用铜浸出-硫浮选-铁磁选的工艺流程可以实现矿石中铜硫铁的有效分离。

New Beneficiation Technology on a Low Grade Copper Ore Containing Sulfur and Iron from Guangdong Province

Main valuable elements copper，sulfur，iron grade is 0.51%，27.68% and 34.07% in a low-grade copper ore from Guangdong province.Copper occurrence state is complex，secondary copper sulfide copper accounted for 54.91% of total copper，water soluble copper accounted for 26.39% of total copper，high copper recovery cannot obtained by conventional flotation method.To explore high efficient separation technology for copper，sulfur，iron，metallurgy process research was conducted.Results show that at the grinding fineness of 72% passing 0.074 mm，using sulfuric acid solution with pH=3 as leaching agent，the liquid-solid ratio of 4 mL/g，stirring speed of 1 400 r/min，leaching time of 24 h，copper leaching rate of 93.33% can be obtained；Copper leaching slag being lavated to pH=6 via one roughing one scavenging sulfur flotation process using butyl xanthate as collector，2# oil as frother，the sulfur concentrate was obtained with sulfur grade of 48.44% and recovery to copper leaching slag is 95.57%；Sulfur flotation tailings via one stage high gradient high intensity magnetic separation operation using Ф2 mm rods medium as magnetic medium，pulsating stroke is 16 mm，pulsating frequency is 280 times/min，background magnetic field intensity is 0.6 T，the iron concentrate was obtained with iron grade of 51.42%，recovery to copper leaching slag is 17.02%.The abrove test results indicated that effective separation of copper，sulfur and iron can be realized via copper leaching-sulfur flotation-magnetic separation technological process.