还原焙烧—磁选分步回收针铁矿渣中的锌铟铁  

Recovery of Zn,In,and Fe from Gothite Slag by Reduction Roasting Combined with Magnetic Separation

作　　者：高文成 温建康[1,2,3] 付政 蔡镠璐[1,2,3] 尚鹤 GAO Wen-cheng;WEN Jian-kang;FU Zheng;CAI Liu-lu;SHANG He(GRINM Resources and Environment Tech.Co.,Ltd.,Beijing 101407,China;GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China;National Engineering Research Center for Environment-friendly Metallurgy in Producing Premium Non-ferrous Metals,General Research Institute for Non-Ferrous Metals,Beijing 101407,China)

机构地区：[1]有研资源环境技术研究院(北京)有限公司,北京101407 [2]有研工程技术研究院有限公司,北京101407 [3]北京有色金属研究总院高品质有色金属绿色特种冶金国家工程研究中心,北京101407

出　　处：《有色金属（冶炼部分）》2022年第2期1-7,共7页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家重点研发计划项目(2018YFC1900403);磷资源开发利用教育部工程研究中心开放基金资助项目(LKF202003);广西重点研发计划项目(桂科AB18050019)。

摘　　要：针铁矿法常用于湿法炼锌工艺中的除铁,其产生的针铁矿渣含有铁、锌等有价金属,具有较高的回收价值。以广东某冶炼厂针铁矿渣为原料,提出了采用还原焙烧—磁选的方法分步回收其中的锌、铟和铁资源。首先进行了较为详细的工艺矿物学研究,查明了其中有价金属含量和主要物相组成;通过考察还原焙烧过程中的主要影响因素,得到优化后的还原焙烧条件为:碳粉添加量为针铁矿渣量的60%、焙烧时间4 h、焙烧温度1100℃,锌和铟的挥发率可分别达到93.63%和71.48%。还原焙烧后的渣进行强磁—弱磁磁选试验获得铁精矿产品,铁精矿产品产率69.46%、铁品位63.80%。Removal of ferrous by gothite method is frequently used in zinc hydrometallurgy process,and gothite slag contains valuable metals(Fe,Zn,In,etc),which has a high recovery value for utilization.A novel process was proposed to recover Zn,In,and Fe from gothite slag through reduction roasting combined with magnetic separation.Firstly,a detailed process mineralogy study was carried out by MLA analysis to find out content of valuable metals and composition of main phases.Effect factors were systemically studied in reduction roasting,and the optimal condition was obtained as follows:addition of carbon powder is 40%,roasting time is 4 h,and roasting temperature is 1100℃.Under this condition,volatilization efficiencies of zinc and indium are 93.63% and 71.48% respectively.The reduction roasting residue was crushed,milled and separated by high-intensity and low-intensity magnetic field for producing iron ore concentrate with Fe content of 63.80%,and yield rate of 69.46%.

关 键 词：针铁矿渣 还原焙烧 磁选 锌 铟 铁 回收 

分 类 号：TF803.12[冶金工程—有色金属冶金]