|
| Thermodynamic Equilibrium Analysis on Mg2+-CO32--Nta3--H2O System |
|
Received:July 29, 2018
Revised:August 18, 2018
Accepted:August 20, 2018
Published Online:October 16, 2018
|
| View Full Text View/Add Comment Download reader |
| DOI：doi：10.3969/j.issn.1007-7545.2018.11.001 |
| KeyWord:thermodynamics; MgCO3; nitrilotriacetic acid |
| Author | Institution |
| SU Mingru |
江苏大学 材料科学与工程学院 |
| Dou Aichun |
江苏大学 材料科学与工程学院 |
| Gao Tian |
江苏大学 材料科学与工程学院 |
| Liu Tong |
江苏大学 材料科学与工程学院 |
| LIU Shuai |
江苏大学 材料科学与工程学院 |
| Liu Yunjian |
江苏大学 材料科学与工程学院 |
|
| Hits: 2046 |
| Download times: 2119 |
| Abstract: |
| Impurity of magnesium carbonate (MgCO3) was studied with nitrilotriacetic acid as ligand. Thermodynamic equilibrium equation of Mg2+-CO32--Nta3--H2O system was established, and thermodynamic equilibrium diagram was drawn to investigate selectivity of Nta3- on magnesium under total concentration of Nta3- of 0~2.5 mol/L and pH value of 5~14. The results show that dissolution of MgCO3 under acidic condition is mainly upon effect of H+, while dissolution of MgCO3 under alkaline condition is mainly due to coordination reaction between Mg2+ and Nta3?. However, dissolution quantity of MgCO3 is very low in alkaline system because coordination ability of Mg2+ with Nta3- is very weak. Alkaline nitrilotriacetic acid system has high selectivity to magnesium in minerals. |
| Close |