脱硫石膏制备硫酸钙晶须的试验研究  

Preparation of Calcium Sulfate Whiskers from Desulfurized Gypsum

作　　者：曹永丹 赵天悦 曹钊 张金山 董红娟 CAO Yongdan;ZHAO Tianyue;CAO Zhao;ZHANG Jinshan;DONG Hongjuan(School of Mining and Coal Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Engineering Center for Exploitation and Utilization of Coal Safety of Inner Mongolia,Baotou 014010,China)

机构地区：[1]内蒙古科技大学矿业与煤炭学院,包头014010 [2]内蒙古煤炭安全开采与利用工程技术研究中心,包头014010

出　　处：《硅酸盐通报》2022年第5期1765-1773,共9页Bulletin of the Chinese Ceramic Society

基　　金：内蒙古自治区高等学校科学研究项目(NJZY22441);内蒙古自治区科技重大专项(NMZDZX2017019,NMZDZX2018022);中央引领地方科技发展专项资金(ZYYLNM2018010)。

摘　　要：以脱硫石膏为原料通过水热合成法制备硫酸钙晶须,借助X射线衍射仪、扫描电子显微镜、能谱仪、热重分析仪等测试手段进行分析,研究了酸化预处理、料浆浓度以及反应温度对制备硫酸钙晶须的影响。结果表明:酸化预处理可以有效去除原料中的CaCO_(3)杂质;随着料浆浓度和反应温度的增加,晶须长径比均呈现先增大后减小的趋势;当料浆浓度为3%(质量分数),pH值为6.5,反应温度为120℃,反应时间为2 h时,取得的硫酸钙晶须最佳平均长度为161.2μm,最佳平均长径比为46.06。Calcium sulfate whiskers were prepared by hydrothermal synthesis method with desulfurized gypsum as raw material.The effects of acidification pretreatment,slurry concentration and reaction temperature on the preparation of calcium sulfate whiskers were studied by X-ray diffractometer,scanning electron microscope,energy spectrometer,thermal gravimetric analyzer and other test methods.The experimental results show that the acidification pretreatment effectively removes CaCO_(3) impurities in raw materials.As the slurry concentration and reaction temperature increase,the aspect ratio of whisker increases first and then decreases.When the slurry concentration is 3%(mass fraction),the pH value is 6.5,the reaction temperature is 120℃and the reaction time is 2 h,calcium sulfate whiskers achieve the best average length of 161.2μm,and the best average aspect ratio of 46.06.

关 键 词：脱硫石膏 硫酸钙晶须 水热合成 酸化预处理 料浆浓度 反应温度 

分 类 号：TB32[一般工业技术—材料科学与工程]