水热浸出-浮选综合回收铅银渣中金银实验研究  

Experimental Research on Comprehensive Recovery of Gold and Silver from Lead-Silver Residue by Hydrothermal Leaching-Floatation

作　　者：郭艳华[1] 孙运礼[1] 郭海宁[1] 杨俊龙[1] 廖雪珍[1] 彭建城[1] 

机构地区：[1]西北矿冶研究院,甘肃白银730900

出　　处：《贵金属》2015年第4期63-68,共6页Precious Metals

摘　　要：为了提高资源利用效率,实现二次资源综合利用,对铅银渣进行了实验研究。铅银渣中银品位为245 g/t,金品位为1.52 g/t,金、银含量均较高。银的赋存状态研究表明,银主要以再造矿物铜蓝、硫化银混合相存在。结合银的赋存状态进行流程探索,确定采用水热浸出-浮选工艺流程。条件实验研究表明,液固比为2:1,浸出温度为70℃,浸出时间为2 h进行水热浸出,金、银在渣中富集率较高。当磨矿细度-0.044 mm占85%,粗选T19用量为4000 g/t,硫酸铜用量为600 g/t,酯-30用量为500 g/t时,经过一次粗选、两次精选、一次扫选的闭路实验流程,可获得银品位为3805 g/t,银回收率为86.82%的银精矿,银精矿中金的品位为25.8 g/t,金回收率为94.96%的较好指标,实现了铅银渣的综合回收。In order to improve the efficiency of resource utilization and realize the comprehensive utilization of secondary resources, the present tests were carried out to recover gold and silver effectively from lead-silver residue as a secondary resource. The content of gold and silver in the lead-silver residue was high, with the silver being at 245 g/t in the form of copper blue and silver sulfide minerals,and gold being at 1.52 g/t. Based on the state of silver, a hydrothermal leaching-flotation process was used. The involved condition experiments showed that a great enrichment rate of gold and silver in the slag was achieved when the liquid-solid ratio was 2：1 at 70℃ for 2 h in hydrothermal leaching procedure. The flotation included grinding, one roughing, two cleaning, one scavenging of a closed-circuit process. The chemicals used in flotation procedure were T19 at a dose of 4000 g/t, copper sulfate at a dose of 600 g/t, ester-30 at a dose of 500 g/t. After leaching-flotation, silver was concentrated to a content of 3805 g/t with a recovery rate of 86.82% while gold to a content of 25.8 g/t with the recovery being up to 94.96%.

关 键 词：有色金属冶金 铅银渣 水浸 浮选 T19 硫酸铜 酯-30 

分 类 号：TD91[矿业工程—选矿] TF813[冶金工程—有色金属冶金]