转晶剂与蒸压参数对磷石膏制备α半水石膏的影响  

Effect of crystal modifier and autoclave parameters on preparation ofα-hemihydrate gypsum from phosphogypsum

作　　者：黎明川 韦家崭[1,2,3] 陈平[2,4] 段鹏选 LI Mingchuan;WEI Jiazhan;CHEN Ping;DUAN Pengxuan(College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology;Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials,Guilin University of Technology;Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi,Guilin University of Technology.)

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004 [2]桂林理工大学广西建筑新能源与节能重点实验室 [3]桂林理工大学广西工业废渣建材资源利用工程技术研究中心 [4]桂林理工大学广西有色金属隐伏矿床勘查及材料开发协同创新中心

出　　处：《无机盐工业》2022年第8期132-137,共6页Inorganic Chemicals Industry

基　　金：广西中青年教师基础能力提升项目(2020KY06022);广西建筑新能源与节能重点实验室开放基金(桂科能19-J-21-16);广西光电材料重点实验室开放基金(20AA-21);广西科技计划项目(桂科AA21077012)。

摘　　要：以经盐溶液预处理的磷石膏为原料,以乙二胺四乙酸(EDTA)和顺丁烯二酸酐为复合转晶剂,采用蒸压法制备α半水石膏。借助扫描电镜(SEM)、X射线衍射(XRD)分析研究了复合转晶剂掺量、pH、蒸压温度对生成α半水石膏的晶体形貌、物相组成的影响。研究结果表明,复合转晶剂中EDTA的最佳掺量(质量分数)为0.4%、顺丁烯二酸酐的最佳掺量(质量分数)为0.3%,溶液最佳pH为7.5,最佳蒸压温度为140℃。在此条件下制得的α半水石膏结晶形态最好,呈短柱状,长径比接近1∶1。Theα-hemihydrate gypsum was obtained by autoclave method from phosphogypsum as raw materials that was treated with saline solution,using ethylenediamine tetraacetic acid(EDTA)and maleic anhydride as crystal modifier in ex⁃periment.The effect of the content of composite crystal modifier,pH value,and autoclave temperature on the crystal mor⁃phology and phase composition ofα-hemihydrate gypsum were studied by scanning electron microscope(SEM)and X-ray diffraction analysis(XRD).The test results showed that the optimum content of EDTA in the composite crystal modifier was 0.4%,the optimum content of maleic anhydride was 0.3%,the optimum pH value of the solution was 7.5,and the optimum autoclave temperature was 140℃.The obtainedα-hemihydrate gypsum had the best crystalline form,with a short columnar shape and a length⁃to⁃diameter ratio close to 1∶1.

关 键 词：磷石膏 Α半水石膏 转晶剂 蒸压参数 

分 类 号：TQ126.3[化学工程—无机化工]