(中南大学 冶金与环境学院，长沙 410083)
摘 要: 通过热力学计算25℃时 体系在水溶液中的离子形态并绘制其随pH、磷浓度变化的关系图。为了模拟镍钼矿硫酸浸出液的液相环境，控制模拟料液中钼的浓度在0.1mol/L左右，分析磷钼摩尔比(n(P):n(Mo))为1:1、1:9、1:12、1:50时其热力学平衡图的变化规律。结果表面：随着pH值的降低，钼的存在形态分别是钼酸根离子、磷钼杂多酸根离子和同多钼酸根离子。当氢离子浓度在0.1mol/L左右，随着溶液中磷浓度的降低，钼的存在形态由Dawson结构的 转变成Keggin结构的 。
关键字: 系；磷钼杂多酸；热力学平衡；镍钼矿；萃取
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:The thermodynamic diagrams of the ionic species were plotted at different pH values and phosphorus concentration in system at 25 ℃. To simulate the liquid phase environment of Ni-Mo ore leaching solution, the diagrams were plotted with different phosphorus-molybdenum molar ratios of 1:1, 1:9, 1:12 and 1:50 at certain molybdenum concentration of 0.1 mol/L. The results show that, as the pH value decreases, the species of molybdenum are molybdate anion, molybdophosphate anion and isopolymolybdate ion. As the phosphorus concentration decreases, the species of molybdenum is converted into Keggin-type from Dawson-type at certain hydrogen ion concentration 1 mol/L.
Key words: system; molybdophosphate; thermodynamic equilibrium; Ni-Mo ore; extraction
