Atmospheric oxygen-rich direct leaching behavior of zinc sulphide concentrate  

硫化锌精矿常压富氧直接浸出行为(英文)

作　　者：徐志峰[1] 江庆政[1] 王成彦[2] 

机构地区：[1]江西理工大学冶金与化学工程学院,赣州341000 [2]北京矿冶研究总院,北京100160

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第12期3780-3787,共8页中国有色金属学报（英文版）

基　　金：Project (50964004) supported by the National Natural Science Foundation of China

摘　　要：The leaching behavior of main metallic sulphides in zinc concentrate under atmospheric oxygen-rich direct leaching conditions was studied through mineralogical analysis. The results show that the sulphides dissolve obviously except pyrite. Based on the relationship between elemental sulfur and the residual sulphides in the leaching residue, the dissolution of sphalerite, chalcopyrite, covellite and galena is assumed to follow the indirect oxidation reactions, where the acidic dissolution takes place firstly and then the released H2S transfers from the mineral surface into bulk solution and is further oxidized into elemental sulfur. The interface chemical reaction is further supposed as the controlling step in the leaching of these sulphides. The direct electrochemical oxidation reactions are assumed to contribute to the dissolution of pyrrhotite, which is controlled by the diffusion through elemental sulfur layer.借助工艺矿物学分析对常压富氧直接浸出条件下锌精矿中主要硫化物的浸出行为进行研究。结果表明,除黄铁矿外,其他硫化矿均会明显溶解。基于对浸出渣中单质硫与反应残余硫化物之间关系的分析,认为闪锌矿、黄铜矿、铜蓝、方铅矿的溶出可能遵循间接氧化方式,即硫化物首先酸溶,生成的H2S脱离矿物表面并迁移至溶液本体中进而氧化成单质硫。上述硫化矿的浸出过程可能受界面化学反应控制。对于磁黄铁矿的溶出,直接电化学氧化可能起主导作用,其浸出过程可能受产物层单质硫的扩散控制。

关 键 词：zinc sulphide concentrate atmospheric direct leaching oxygen-rich leaching leaching behavior MINERALOGY 

分 类 号：TF813[冶金工程—有色金属冶金]