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以某厂毒重石制备氯化钡过程中副产的高钙废水为原料,在常压条件下制备硫酸钙晶须。首先,用少量稀硫酸对钙水进行除杂处理,然后通过正交实验对实验过程进行优化,得出较优反应条件为:高钙废水20 m L、1 mol/L硫酸用量72 m L、氯化镁用量0.75 g、反应温度108℃、反应时间3 h,搅拌强度300 r/min。经图像颗粒分析系统、数显白度仪和XRD表征,该产品为半水硫酸钙晶须,长径比55,白度为91.2%,纯度为98.7%,产率41%。用响应曲面法对工艺条件进行优化,得到的最优工艺条件和实验得到的较优条件是相近的。
Calcium sulfate whisker was prepared under the atmospheric pressure by using high-calcium waste water byproduced in the process of preparing barium chloride from a plant witherite. First of all, with a small amount of dilute sulfuric acid on the calcium impurity removal treatment, and then through orthogonal experiments to optimize the experimental process, the optimal reaction conditions were: high calcium wastewater 20 m L, 1 mol / L sulfuric acid dosage 72 m L, The dosage of magnesium chloride was 0.75 g, the reaction temperature was 108 ℃, the reaction time was 3 h and the stirring intensity was 300 r / min. The product is calcium sulfate hemihydrate whisker with an aspect ratio of 55, a whiteness of 91.2%, a purity of 98.7% and a yield of 41%. The response surface method is used to optimize the process conditions, and the optimal process conditions obtained are similar to those obtained experimentally.