硅酸镍在氨-硫酸铵-水溶液中的溶解机理  

Dissolution behavior of nickel silicate in ammonia-ammonium sulfate aqueous solution

作　　者：刘智勇[1] 李启厚[1] 刘志宏[1] 杨天足[1] 姜波[1] 李玉虎[1] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第7期2669-2674,共6页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划("973"计划)项目(2007CB613604);教育部新世纪优秀人才资助计划(NCET-11-0517)

摘　　要：对不同结构的NiSiO3在氨性体系的溶解平衡进行研究,从晶体结构方面考察氧化镍矿在氨性体系中的溶解机理,进一步查明氧化镍中矿物结构对镍浸出行为的影响。研究结果表明:随着温度的升高,NiSiO3的结晶度逐渐增加、晶粒尺寸逐渐增大、微观应变逐渐减小、晶体结构更完整、稳定性更高。在总氨浓度3.5 mol/L,n(NH3)/n(NH4+)为2:3,温度为25℃条件下,结晶度为0%和100%的NiSiO3在NH3-(NH4)2SO4-H2O体系中溶解平衡时,溶液中的Ni2+质量浓度分别为7.000 g/L和0.029 g/L,结晶完整的NiSiO3很难溶解。The dissolution equilibrium of NiSiO3with various structures in ammonia system was studied.The dissolution mechanism of nickel oxide ore in ammonia system was examined in terms of crystal structure.The influence of mineral structure of nickel oxide on the leaching of nickel was researched.The results show that with the increase of the temperature,the crystallinity and the grain size of NiSiO3 increase gradually.While the strain decreases,the crystal structure will be more completed,that is,the crystal has higher stability.When the total ammonia concentration is 3.5 mol/L,n（NH3）/n（NH4＋） is 2：3,temperature is 25 ℃,the mass concentrations of NiSiO3 with crystallinity of 0% and 100% are 7.000 g/L and 0.029 g/L,respectively.So NiSO3with ideal structure is difficult to dissolve.

关 键 词：硅酸镍 结晶度 晶粒尺寸 微观应变 溶解度 

分 类 号：TF803.21[冶金工程—有色金属冶金] TF813