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 s...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·MgCI2·14H2O), magnesium hydroxide(Mg(OH)2) and magnesium oxychloride (5Mg(OH)2·MgCI2·8H2O).展开更多
文摘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·MgCI2·14H2O), magnesium hydroxide(Mg(OH)2) and magnesium oxychloride (5Mg(OH)2·MgCI2·8H2O).
