利用脱硫石膏水热合成硫酸钙晶须

Preparation of Calcium Sulfate Whiskers from Desulphurized Gypsum by Hydrothermal Synthesis

以脱硫石膏为原料,采用水热法工艺制备硫酸钙晶须.借助电导率、化学电位、XRD和SEM等分析方法,在不同反应条件下研究了硫酸钙晶须生长的变化规律,随着反应温度、反应时间、固液比和初始pH值的增加,硫酸晶须的长径比呈先增加后减小的趋势.在本实验条件下最佳工艺参数为:反应温度140℃,反应时间120min,固液比为1∶10,初始pH值为5,原料粒度1.36μm.此时所制备的硫酸钙晶须长径比可以达到82.57.

Hydrothermal synthesis was employed to prepare calcium sulfate whiskers （CSW） with desulphurized gypsum as raw material. The growth rules of CSW were investigated under different reaction conditions by virtue of chemical potential,electric conductivity,XRD and SEM. It was found that the aspect ratio of CSW tends to increase then decrease with increasing of the reaction temperature/time,solid-liquid ratio and initial pH value. The optimized process parameters as a result of the tests are the solid-liquid ratio is 1∶10,initial pH value 5,raw material grain size 1.36μm and reaction temperature/time 140 ℃/120 min,by which the aspect ratio of CSW may come up to 82.57.