中文摘要：

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（NH2）：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。

英文摘要：

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.