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本文用一种新的计算方法作出了Ni-NH_3-H_2O系的E-pH图。此法应用络合物体系中的同时平衡原理,并考虑了镍氨络离子中的氨,因此绘出的图比以前的图更准确、更切合实际。从图中可见,Ni(NH_3)_n~(2+)的形成,显著地扩大了镍离子在水溶液中的稳定范围,从热力学上阐述了氨浸金属镍的优越性。结果表明,在一定的温度下,影响Ni(NH_3)_n~(2+)稳定范围的主要因素是总氨浓度和总镍浓度。
In this paper, we use a new method to calculate the E-pH of Ni-NH_3-H_2O system. This method applies the simultaneous equilibrium principle in the complex system and takes account of the ammonia in the nickel ammonia complex ion, so the plot drawn is more accurate and realistic than the previous one. It can be seen from the figure that the formation of Ni (NH_3) _n ~ (2+) significantly enlarges the stable range of nickel ions in aqueous solution and thermodynamically expounds the superiority of ammonia leaching of nickel metal. The results show that under a certain temperature, the main factors affecting the stability of Ni (NH_3) _n ~ (2+) are total ammonia concentration and total nickel concentration.