摘要
The stability constants of Sb^5+with Cl−as well as thermodynamics of the Sb−S−Cl−H2O system were calculated.The stability constants of Sb5+with Cl−were obtained by theoretical calculations of the absorbance of a Sb5+-containing solution at different Cl^−concentrations,which was detected by spectrophotometric analysis at certain wavelengths of light(380 nm).The logarithmic values versus 10 of stability constants of Sb^5+with Cl−were 1.795,3.150,4.191,4.955,5.427 and 5.511,respectively,and partly filled the data gaps in the hydrometallurgy of antimony.The presence and distribution of pentavalent antimony compounds under different conditions were analyzed based on equilibrium calculations.Thermodynamic equilibrium calculations were performed for Sb−S−Cl−H2O system,which included the complex behavior of Sb with Cl,and the equilibrium equations of related reactions in this system were integrated into the potential−pH diagram.
测定五价锑离子与氯离子的配位常数,并进行Sb−S−Cl−H2O体系的热力学研究。采用分光光度法进行配位稳定常数的测定,在一定波长(380 nm)下测定含五价锑离子溶液在不同氯离子条件下的光度值,通过理论计算得到五价锑离子与氯离子的配位稳定常数。配位稳定常数以10为底的对数函数值分别为1.795、3.150、4.191、4.955、5.427和5.511,填补了锑湿法冶金中的部分数据空白。结合配位稳定常数,通过热力学计算研究五价锑离子的赋存形式和分布规律,并将锑离子与氯离子配位行为的影响带入Sb−S−Cl−H2O体系进行热力学研究,得到复合电位−pH图。
基金
Projects(51904048,51922108)supported by the National Natural Science Foundation of China
Project(2019JJ20031)supported by the Hunan Natural Science Foundation,China
Project(gjj170507)supported by the Scientific Research Foundation of Jiangxi Provincial Department of Education,China。
