广东某含硫铁低品位铜矿石选矿工艺研究

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

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p H=3的硫酸溶液为浸出剂,在液固比为4 m L/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p H=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2mm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。

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 railings via one stage high gradient high intensity magnetic separation operation using 02 mm rods medium as magnetic medium, pulsating stroke is 16 ram, 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.