基于酸溶法用高硫石膏制备硫酸钙晶须工艺研究

Preparation of Calcium Sulphate Whisker Using Desulfurization Gypsum by Acid Dissoluble and Recrystallization

研究了用碳酸化处理后的脱硫石膏经酸溶重结晶纯化制备硫酸钙晶须。结果表明:在固液质量体积比70g/L、反应时间3h、反应温度90℃以上、盐酸浓度2.0mol/L条件下,脱硫石膏得到有效溶解;溶解液晶净化、重结晶得到硫酸钙晶须;产品白度由脱硫石膏原料的44.7%提高至94.5%,纯度由90%提高到99%以上,颗粒粒径分布宽,颗粒形貌由片状转变为柱状。酸溶重结晶显著改善了石膏的颗粒级配和应用性能。

Calcium recrystallization p reaction time of 3 sulfate whisker was prepared using desulfurization gypsum by acid dissolution and urification. The results show that under the conditions of solid-to-liquid of 70 g/L, h, reaction temperature the high purity calcium sulfate whisker 44.7%,the purity is over 99% from morphology is columnar. The process o performance and grain size distribution above 90 ℃, hydrochloric acid concentration of 2.0 mol/L, is obtained. The product whiteness is up to 94. 5% from 90%. The product particle size distributes broad and particle f acid dissolving and recrystallization improves significantly the and application of desulfurization gypsum.