高碱性脉石低品位混合镍矿氧压浸出行为与机制研究  

Study on Leaching Behaviors and Mechanism of Nickel From Low Grade Ore With High Alkaline Gangue by High-pressure Ammonia Leaching

作　　者：李启厚[1] 姜波[1] 刘智勇[1] 王红军[1] 刘志宏[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《湿法冶金》2013年第3期154-157,共4页Hydrometallurgy of China

基　　金：教育部新世纪优秀人才资助计划项目(NCET-11-0517);国家973计划项目(2007CB613600)

摘　　要：研究了氧压氨浸条件下高碱性脉石低品位混合镍矿在NH3-(NH4)2SO4-H2O体系中的浸出行为与机制。结果表明:在氧分压1.3MPa、浸出温度120℃、总氨浓度8mol/L、c(NH3)∶c((NH4)2SO4)=1.5∶1、液固体积质量比10∶1、浸出时间2h条件下,镍浸出率达70.86%,其中以氧化镍和硫化镍形式存在的镍浸出率达93%,而赋存于硅酸盐晶格中的镍因热力学原因不能被浸出。In the system of NH3-（NH4 ）2SO4-HzO, leaching behaviors and mechanism of nickel from a low grade ore with high alkaline gangue has been experimental investigated by high pressure ammonia leaching. The results showed that leaching rate of Ni in ore was up to 70.86%, and leaching rate of nickel in sulfide and nickel oxide was near to 93% under the conditions of oxygen pressure of 1. 3 MPa,leaching temperature of 120 ℃ ,total ammonia concentration in lixivium of 8 mol/L, c（NH3） ： c（（NH4）2SO4） of 1.5 ： 1, V（liquid） ： m（solid） of 10：1, leaching time of 2 h. The nickel silicate in ore could not be dissolved due to thermodynamics effect.

关 键 词：碱性脉石 混合镍矿 高压 氨浸 氨-硫酸铵体系 

分 类 号：TF815[冶金工程—有色金属冶金]