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
环境·健康·安全

CaCl2和MgCl2及其复合溶液制备α-半水石膏

  • 胡成 ,
  • 刘梦 ,
  • 向玮衡 ,
  • 陈平 ,
  • 王能 ,
  • 卢冠举 ,
  • 周金兰
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  • 1.桂林理工大学,广西绿色建材与建筑工业化重点实验室,广西 桂林 541004
    2.桂林理工大学,土木与建筑工程学院,广西 桂林 541004
    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,广西 桂林 541004
胡成(1988— ),男,博士,研究方向为固废资源化利用、低碳胶凝材料;E-mail:hucheng42@glut.edu.cn
向玮衡(1989— ),女,博士,讲师,主要研究方向为高性能无机胶凝材料;E-mail:XWH891116@163.com

收稿日期: 2023-10-10

  网络出版日期: 2024-08-01

基金资助

广西重点研发计划项目(桂科AB22035064);国家自然科学基金项目(52368029);广西绿色建材与建筑工业化重点实验室开发基金项目(桂科能22-J-21-19)

Preparation of α-hemihydrous gypsum from CaCl2 and MgCl2 and their composite solution

  • HU Cheng ,
  • LIU Meng ,
  • XIANG Weiheng ,
  • CHEN Ping ,
  • WANG Neng ,
  • LU Guanju ,
  • ZHOU Jinlan
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  • 1.GuangXi Key Laboratory of Green Building Materials and Construction Industrialization,Guilin University of Technology,Guilin 541004,China
    2.Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials,Guilin University of Technology,Guilin 541004,China
    3.College of Civil and Architectural Engineering,Guilin University of Technology,Guilin 541004,China

Received date: 2023-10-10

  Online published: 2024-08-01

摘要

为提高磷石膏的利用率和附加值,采用常压水热合成法以磷石膏为主要原材料制备α-半水石膏材料,主要研究不同质量分数的CaCl2、MgCl2及其复合溶液对磷石膏常压水热制备α-半水石膏脱水速率、物相组成和微晶形貌的影响。研究发现,磷石膏在95 ℃的CaCl2溶液、MgCl2溶液及CaCl2-MgCl2复合溶液中均可脱水转晶生成α-半水石膏。在CaCl2溶液和MgCl2溶液中,随着盐溶液浓度的增加,α-半水石膏的生成速率加快,其中经质量分数为35%的CaCl2溶液反应4 h后或质量分数为25%的MgCl2溶液反应1 h后,磷石膏可完全反应成α-半水石膏。在CaCl2-MgCl2复合溶液中,随着MgCl2溶液浓度的增加,磷石膏的脱水转化速率逐渐加快,当CaCl2质量分数≤19%和MgCl2质量分数≥11%时,磷石膏水热反应1 h即可形成颗粒分布较为完整的α-半水石膏。

本文引用格式

胡成 , 刘梦 , 向玮衡 , 陈平 , 王能 , 卢冠举 , 周金兰 . CaCl2和MgCl2及其复合溶液制备α-半水石膏[J]. 无机盐工业, 2024 , 56(7) : 112 -117 . DOI: 10.19964/j.issn.1006-4990.2023-0484

Abstract

In order to improve the utilization rate and added value of phosphogypsum,α-hemihydrate gypsum was prepared from phosphogypsum by atmospheric hydrothermal synthesis method.The effects of CaCl2,MgCl2 and their composite solutions on the dehydration rate,phase composition and microcrystal morphology of α-hemihydrate gypsum prepared by atmospheric hydrothermal preparation of phosphogypsum were studied.It was found that phosphogypsum could be dehydrated and recrystallized to form α-hemihydrate gypsum in CaCl2 solution,MgCl2 solution and CaCl2-MgCl2 composite solution at 95 ℃.In CaCl2 solution and MgCl2 solution,the formation rate of α-hemihydrate gypsum accelerated with the increase of salt solution concentration,in which phosphogypsum could be completely reacted into α-hemihydrate gypsum after reaction of 35%CaCl2 solution for 4 h or 25%MgCl2 solution for 1 h.In the CaCl2-MgCl2 composite solution,the dehydration and conversion rate of phosphogypsum gradually accelerated with the increase of the concentration of MgCl2 solution.When the mass fraction of CaCl2 was≤19% and the mass fraction of MgCl2 was≥11%,the hydrothermal reaction of phosphogypsum for 1 h could form α-hemihydrate gypsum with relatively complete particle distribution.

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