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首页> 外文期刊>Journal of Crystal Growth >Growth rate of α-calcium sulfate hemihydrate in K-Ca-Mg-Cl-H_2O systems at elevated temperature
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Growth rate of α-calcium sulfate hemihydrate in K-Ca-Mg-Cl-H_2O systems at elevated temperature

机译：高温下α-硫酸钙半水合物在K-Ca-Mg-Cl-H_2O体系中的生长速率

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摘要

Kinetics of calcium sulfate hemihydrate (HH) crystal growth plays an important role in mineralization of calcium sulfate phases in nature. HH crystal growth and the conversion of calcium sulfate phases form the basis for the production and application of gypsum based building material. α-HH crystals have been grown in 3.74 M CaCl_2 solutions at a fixed initial ratio of calcium to sulfate under atmospheric pressure. The variations of sulfate ions were determined to obtain the ot-HH crystal growth kinetics information. Effects of Mg~(2+) and K~+ ions on ot-HH growth were investigated to find an optimal composition of solution for α-HH preparation. The orders of α-HH growing in the CaCl_2 solution were found, in most cases, to be near 2.0 in presence or in absence of Mg~(2+) and K~+ ions. Mg~(2+) ions enhance the growth of α-HH in CaCl_2 solution mainly due to initial supersaturation enhancing effects. K~+ ions also improve the growth rate, which has been attributed to the reduction of interfacial energy. In a Ca (3.74M)-Mg (0.20 M)-K (0.09 M) chlorides solution, the growth rate of α-HH increases with temperature from 80 to 100 ℃, and the activation energy was calculated to be 40kJ/mol.
机译：硫酸钙半水合物（HH）晶体生长的动力学在自然界中硫酸钙相的矿化中起重要作用。 HH晶体的生长和硫酸钙相的转化形成了石膏基建筑材料的生产和应用的基础。在3.74 M CaCl_2溶液中，在大气压力下以固定的钙对硫酸盐的初始比例生长了α-HH晶体。确定硫酸根离子的变化以获得ot-HH晶体生长动力学信息。研究了Mg〜（2+）和K〜+离子对ot-HH生长的影响，从而找到制备α-HH的最佳溶液组成。在大多数情况下，发现存在或不存在Mg〜（2+）和K〜+离子时，α-HH在CaCl_2溶液中的生长顺序接近2.0。 Mg〜（2+）离子促进CaCl_2溶液中α-HH的生长，主要是由于初始的过饱和增强作用。钾离子也提高了生长速率，这归因于界面能的减少。在Ca（3.74M）-Mg（0.20 M）-K（0.09 M）氯化物溶液中，α-HH的生长速率随温度从80升高到100℃而增加，并且计算的活化能为40kJ / mol。

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