(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 通過(guò)對(duì)Mn2+-Ca2+-Mg2+-OH−-NH3-NH4+-H2O體系的熱力學(xué)分析，得到各金屬離子濃度與pH 的關(guān)系，從而確定鎂、錳深度脫除的條件。熱力學(xué)分析結(jié)果表明，溶液中鎂、錳的含量隨著體系pH的增大而降低，要達(dá)到鎂、錳的深度脫除必須保證pH值大于11。另外，對(duì)Ca2+-CO32−-NH3-NH4+-H2O體系的分析得出，當(dāng)溶液的pH控制在11~11.5之間，碳酸根離子的總濃度[C]T≥0.001 mol/L時(shí)就可以使溶液中鈣的濃度降低到10−5 mol/L以下。
關(guān)鍵字: 含錳廢水；熱力學(xué)分析；深度凈化；鎂；錳；鈣
（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
