(中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 通过对Mn2+-Ca2+-Mg2+-OH−-NH3-NH4+-H2O体系的热力学分析，得到各金属离子浓度与pH 的关系，从而确定镁、锰深度脱除的条件。热力学分析结果表明，溶液中镁、锰的含量随着体系pH的增大而降低，要达到镁、锰的深度脱除必须保证pH值大于11。另外，对Ca2+-CO32−-NH3-NH4+-H2O体系的分析得出，当溶液的pH控制在11~11.5之间，碳酸根离子的总浓度[C]T≥0.001 mol/L时就可以使溶液中钙的浓度降低到10−5 mol/L以下。
关键字: 含锰废水；热力学分析；深度净化；镁；锰；钙
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:By thermodynamic analysis on Mn2+-Ca2+-Mg2+-OH−-NH3-NH4+-H2O system, the relationship between pH value and various metals’ concentrations in the system were obtained, and then the removal condition of manganese and magnesium was established. The thermodynamic analysis results show that both the contents of manganese and magnesium in solution decrease with the system pH value increasing. In order to purify manganese and magnesium deeply, pH value of the system must be greater than 11. In addition, thermodynamic analysis on Ca2+- CO32−-NH3-NH4+-H2O system shows that when the pH value of solution is controlled in the range from 11 to 11.5 and the total concentration of carbonate ion [C]T is equal or greater than 0.001 mol/L, the total concentration of calcium in solution can be reduced to below 10–5 mol/L.
Key words: manganiferous wastewater; thermodynamic analysis; deep purification; magnesium; manganese; calcium
