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The crystallization processes of hydrated Mg-borates, boric, magnesium hydroxide and Mg-oxychloride from MgO-B2O3-18%MgCl2-H2O supersaturated solution at 20℃ have been studied by kinetic method. The crystallization solid phases were characterized by X-ray powder diffraction, IR spectra, thermal analysis and chemical analysis. The liquid-solid phase diagram of ther-modynamic nonequilibrium state has been given. In this phase diagram, there exist eight crystallization fields, boric acid(H3BO3), trigomagneborite(MgO · 3B2O3 · 7.5H2O, MgO · 3B2O3 · 7H2O), hungchaoite(MgO ·2B2O3 ·9H2O), inderite(2MgO ·3B2O3 · 15H2O), chloropinnoite(2MgO ·2B2O3 · MgCl2 · 14H2O), magnesium hydroxide(Mg(OH)2) and magnesium oxychloride (5Mg(OH)2 · MgCl2·8H2O).
The crystallization processes of hydrated Mg-borates, boric, magnesium hydroxide and Mg-oxychloride from MgO-B2O3-18% MgCl2-H2O supersaturated solution at 20 ° C have been studied by kinetic method. The crystallization solid phases were characterized by X-ray powder diffraction, IR spectra, thermal analysis and chemical analysis. The liquid-solid phase diagram of the ther- modynamic nonequilibrium state has been given. In this phase diagram, there exist eight crystallization fields, boric acid (H3BO3), trigomagneborite (MgO · 2B2O3 · 9H2O), inderite (2MgO · 3B2O3 · 15H2O), chloropinnoite (2MgO · 2B2O3 · MgCl2 · 14H2O), magnesium hydroxide (Mg (OH) 2) and magnesium oxychloride (5Mg (OH) 2 · MgCl 2 · 8H 2 O).