| 盐卤硼酸盐化学XIII;2MgO.2B2O3. Mgcl2.14H2O结晶动力学研究 |
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| 引用本文： | 高世杨,陈学安,夏树屏. 盐卤硼酸盐化学XIII;2MgO.2B2O3. Mgcl2.14H2O结晶动力学研究[J]. 化学学报, 1990, 48(11): 1049-1056 |
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| 作者姓名： | 高世杨 陈学安 夏树屏 |
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| 作者单位： | 中国科学院青海盐湖研究所 |
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| 摘 要： | 本发明对MgO-B2O-MgCl2-H2O浓盐溶液结晶析出氯柱硼镁石(αMgO,αB2O3MgCl.14H2O)的动力学过程进行了研究, 利用单纯形优化法配合Runge-Kutta微分方程组数值解法对实验数据进行处理, 给出了结晶动力学方程, 并对硼在溶液中的存在形式进行了讨论, 提出了结晶反应机理, 同时考察了温度和氯化镁浓度对结晶速率的影响。
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| 关 键 词： | 反应机理 硼镁石 硼酸盐 氧化镁 水合物 氯化镁 氧化硼 结晶动力学 微分方程 动力学研究 |
Chemistry of borate in salt lake brine XIII: study on crystallization kinetics of 2MgO.2B2O3.MgCl2.14H2O |
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| GAO SHIYANG,CHEN XUEAN,XIA SHUPING. Chemistry of borate in salt lake brine XIII: study on crystallization kinetics of 2MgO.2B2O3.MgCl2.14H2O[J]. Acta Chimica Sinica, 1990, 48(11): 1049-1056 |
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| Authors: | GAO SHIYANG CHEN XUEAN XIA SHUPING |
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| Abstract: | To determine the optimal conditions for the synthesis of the solid phase 2MgO.2B2O3.MgCl2.14H2O, its crystallization kinetics from solns. containing 0.65 MgO, 1.14 B2O3, and 24, 28, and 32% MgCl2 was studied. The experiments were carried out without stirring. At different time intervals, solution samples were taken for anal., and their d. and pH were determine until the solution d. remained basically constant Then the solid phase was separated and identified by chem. anal., IR spectra, x-ray powder diffraction, and thermal anal. The crystallization kinetic curves were all in reverse S shape. At <40? the crystal growth rate increased with rising temperature, but at >40?it decreased. At constant 30? the crystallization rate decreased with increasing MgCl2 concentration At the experimental temps. and concns., only 2MgO.2B2O3.MgCl2.14H2O crystd. from the solution An appropriate math. modification of Nielsen's mononuclear-layer and polynuclear-layer controlled-growth mechanism was made. The experimental data were fitted using a simple optimum method and a Runge-Kutta solution of a differential-equation system. The kinetic equation of the crystallization reactions is given, and a mechanism of crystallization reactions is proposed. |
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| Keywords: | REACTION MECHANISM CAMSELLITE BORATES MAGNESIUM OXIDE HYDRATE MAGNESIUM CHLORIDE BORON OXIDE CRYSTALLIZATION KINETICS DIFFERENTIAL EQUATION KINETIC STUDY |
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