Ni^(2+)-H_2O系配位平衡研究  

Study on Complex Equilibrium of Ni^(2+)-H_2O System

作　　者：杨春[1] 

机构地区：[1]贵阳中医学院,贵州贵阳550002

出　　处：《贵州大学学报（自然科学版）》2011年第2期130-132,共3页Journal of Guizhou University:Natural Sciences

摘　　要：根据络合平衡原理,计算并绘制了Ni2+-H2O系中游离镍(Ⅱ)离子及镍(Ⅱ)的各种羟合配离子浓度的对数(lgc)与溶液pH值关系图及Ni(OH)2条件溶度积的对数(lgKS)与溶液pH值关系图。lgc-pH图描述了Ni(OH)2(s)溶解平衡时,溶液中各种离子的平衡浓度与pH的关系,该图表明:当pH为10.42-11.22时,Ni(OH)2(s)的溶解度最小;lgKS-pH图反映体系pH值对Ni(OH)2(s)溶解度的影响,结果表明:当pH值在9-10范围内,Ni(OH)2(s)的条件溶度积最小。研究结果可为中和水解法去除废水中镍(Ⅱ)及湿法冶金中去除杂质镍(Ⅱ)工艺过程提供理论依据。According to complex balance principle,the relationship figure of the concentration logarithm of free nickel（Ⅱ） ion and nickel（Ⅱ）-hydroxyl ion with the solution PH value,and the relationship figure of the logarithm of Ni（OH） 2 conditions solubility product（lgKS）with the pH value among Ni-H2O system were calculated and drawn.The lgc-pH figure described the relationship between the balance concentration of various ions in solution and pH value when dissolving equilibrium.When the pH is 10.42-11.22,the solubility of Ni（OH）2 is minimum.The lgKS-pH figure shows： when pH value is in the range of 9 to10,the condition solubility product of Ni（OH）2（s） is minimum.The results provide a theoretical basis for neutral-hydrolysis means to remove nickel（Ⅱ） in wastewater and the process of hydrometallurgy removal of impurities Ni（Ⅱ）.

关 键 词：配位平衡 羟合配离子 PH值 条件溶度积 

分 类 号：X52[环境科学与工程—环境工程]