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Citation: YAN Chang-ling, LU Yan, ZHOU Jian-guo. Study on the Composition and Mechanism of Precipitated Solid Phases from M •3B₂O₃-18%MgSO₄-H₂O Supersaturated Solution[J]. Acta Physico-Chimica Sinica, ;2005, 21(10): 1161-1163. doi: 10.3866/PKU.WHXB20051020 shu

Study on the Composition and Mechanism of Precipitated Solid Phases from M •3B₂O₃-18%MgSO₄-H₂O Supersaturated Solution

1.
College of Chemistry and Environmental Science, Henan Normal University, Xinxiang Henan 453007； Department of Chemistry, Lanzhou University, Lanzhou 730000

Received Date: 21 January 2005
Available Online: 15 October 2005

The supersaturated solution of M •3B₂O_3-18%MgSO_4-H₂O was prepared and reacted under hydrothermal conditions at 150 ℃. The solid phases precipitated from the supersaturated solution at different times were identified by chemical analysis, XRD, FT-IR. The results show that the reaction process is unique. The precipitated solid phases of 1 to 5 days were mainly szaibelyite and they gradually dissolved with reaction proceeded. At the same time new solid phases also appeared which composed of MgSO₄•H₂O and MgSO₄•1.25H₂O. The latter was an intermediate with less amount. The former was final product. Based on these results the crystallization mechanism of szaibelyite under the hydrothermal conditions and discussed the effects of hydrothermal temperature on the composition of precipitated solid phases was proposed.
- Hydrothermal temperature;Supersaturated solution;Mg- borate; Crystallization mechanism
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Study on the Composition and Mechanism of Precipitated Solid Phases from M •3B2O3-18%MgSO4-H2O Supersaturated Solution

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Study on the Composition and Mechanism of Precipitated Solid Phases from M •3B₂O₃-18%MgSO₄-H₂O Supersaturated Solution