无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2022, Vol. 54 ›› Issue (8): 132-137.doi: 10.19964/j.issn.1006-4990.2021-0685

• 环境·健康·安全 • 上一篇    下一篇

转晶剂与蒸压参数对磷石膏制备α半水石膏的影响

黎明川1(),韦家崭1,2,3(),陈平2,4,段鹏选2,3   

  1. 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
  • 收稿日期:2021-11-12 出版日期:2022-08-10 发布日期:2022-08-11
  • 作者简介:黎明川(1998— ),女,研究方向为绿色建材;E-mail:2449088020@qq.com
  • 基金资助:
    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)

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

LI Mingchuan1(),WEI Jiazhan1,2,3(),CHEN Ping2,4,DUAN Pengxuan2,3   

  1. 1.College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China
    2.Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology
    3.Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials,Guilin University of Technology
    4.Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi,Guilin University of Technology.
  • Received:2021-11-12 Published:2022-08-10 Online:2022-08-11

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。

关键词: 磷石膏, α半水石膏, 转晶剂, 蒸压参数

Abstract:

The α-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 experiment.The effect of the content of composite crystal modifier,pH value,and autoclave temperature on the crystal morphology and phase composition of α-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 obtained α-hemihydrate gypsum had the best crystalline form,with a short columnar shape and a length?to?diameter ratio close to 1∶1.

Key words: phosphogypsum, α-hemihydrate gypsum, crystal modifier, autoclave parameters

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