化学共沉淀法制备纳米级NiFeCo合金前驱体的热力学分析  

Thermodynamic Analysis on Preparation of Nanometer Precursor of NiFeCo Alloy by Chemical Co-precipitation Method

作　　者：梁勇[1] 林如丹[2] 张刚 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000 [2]赣南医学院信息工程学院,江西赣州341000 [3]湖南航天管理局高新材料与装备技术研发中心,湖南长沙410205

出　　处：《湿法冶金》2011年第4期304-308,共5页Hydrometallurgy of China

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.

关 键 词：铁镍钴合金 前驱体 化学共沉淀 热力学分析 

分 类 号：TB383.1[一般工业技术—材料科学与工程]