(Solid+Liquid) Equilibria in the Quaternary System Na2B4O7-MgB4O7-K2B4O7-H2O at 288 K |
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Authors: | Sang Shihua Peng Jiang |
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Institution: | College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China |
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Abstract: | (Solid+Liquid) phase equilibria in the quaternary system Na2B4O7‐MgB4O7‐K2B4O7‐H2O at 288 K were studied experimentally using the method of isothermal solution saturation. Solubility of any single salt in the solution of the quaternary system was determined experimentally. Based on the experimental data achieved, the phase diagram and water content diagram of the quaternary system were constructed, respectively. In the phase equilibrium diagram of the quaternary system Na2B4O7‐MgB4O7‐K2B4O7‐H2O at 288 K, there are one invariant point E, three univariant curves E1E, E2E and E3E, and three fields of crystallization corresponding to Na2B4O7·10H2O, K2B4O7·4H2O and MgB4O7·9H2O. The experimental results show that potassium borate (K2B4O7·4H2O) have higher solubilities than the magnesium borate and sodium borate in the quaternary system Na2B4O7‐MgB4O7‐K2B4O7‐H2O at 288 K. |
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Keywords: | phase equilibrium borate solubility |
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