摘要
根据同时平衡原理和质量守恒定律,建立了25℃时Me2+-CO23--NH3-H2O(Me2+=Fe2+,Ni2+,Co2+)体系中各种金属总离子浓度与pH的关系,绘制了不同[Ct]和[N]t条件下各金属离子的lg[Met]-pH图。热力学分析表明:增加溶液中总碳浓度或减少总氨浓度,有利于金属离子的共沉淀;当溶液中[Ct]和[N]t分别控制在1.0mol/L和0.2mol/L时,Fe2+、Co2+和Ni2+共沉淀的最佳pH范围为7～8,此时溶液中残余金属离子总浓度在0.1mmol/L以下。
Based on the principle of simultaneous equilibrium and mass law, the relationship between pH value and total concentration of Me2＋ was established in the system of Me2＋-CO3^2--NH3-H2O （where Me2＋ represents Fe2＋ ,Co2＋ and Ni2＋） at 25 ℃, diagrams of lg[Me]t-pH for the system were obtained at different [C]t and [Nit. The thermodynamic analysis results show that it is favorable to precipitate Me2＋ with increasing [C]t or decreasing [N] in the system. Besides, the optimized pH values for Fe2＋ ,Co2＋ and Ni2＋ co-precipitation ranges from 7 to 8 at [C]t of 1.0 mol/L and I-N], of 0.2 mol/L. Thus,the total concentration of residual metal ions is below 10^-4 mol/L.
出处
《湿法冶金》
CAS
北大核心
2011年第4期304-308,共5页
Hydrometallurgy of China
关键词
铁镍钴合金
前驱体
化学共沉淀
热力学分析
NiFeCo alloy
precursor
chemical co-precipitation
thermodynamic analysis
