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 (7): 117-123.doi: 10.19964/j.issn.1006-4990.2021-0597

• 环境·健康·安全 • 上一篇    下一篇

共沸回流法制备α-半水石膏工艺研究

徐成1,2(),沈介发2,3,郝宇宁4,吴炳辉2,5,马晓明2,3,刘建武2,3,严生虎2,3,张跃1,2()   

  1. 1.常州大学环境与安全工程学院, 江苏 常州 213164
    2.常州大学石油和化工行业连续流技术工程实验室
    3.常州大学药学院
    4.中国石油吉林石化分公司丙烯腈厂
    5.常州大学石油化工学院
  • 收稿日期:2021-10-08 出版日期:2022-07-10 发布日期:2022-07-14
  • 作者简介:徐成(1995— ),男,硕士研究生,主要研究方向为工业废水处理;E-mail:457602503@qq.com
  • 基金资助:
    工信部产业技术基础公共服务平台(2020-0107-3-1)

Study on process of preparing α-hemihydrate gypsum by azeotropic reflux method

XU Cheng1,2(),SHENG Jiefa2,3,HAO Yuning4,WU Binghui2,5,MA Xiaoming2,3,LIU Jianwu2,3,YAN Shenghu2,3,ZHANG Yue1,2()   

  1. 1.School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
    2.Continuous Flow Engineering Laboratory of National Petroleum and Chemical Industry, Changzhou University
    3.School of Pharmacy, Changzhou University
    4.PetroChina Acrylonitrile Factory of Jilin Chemical Group Company
    5.School of Petrochemical Engineering, Changzhou University
  • Received:2021-10-08 Published:2022-07-10 Online:2022-07-14

摘要:

为消除副产石膏对环境的危害,提高副产石膏的利用价值,采用共沸回流法以工业废酸石膏为原料,经过浆料配制、投加共沸溶剂、转晶反应以及抽滤烘干得到α-半水石膏,并对α-半水石膏的最佳合成工艺进行了探究。通过X射线衍射仪(XRD)、扫描电镜(SEM)对产物进行表征。重点研究了共沸溶剂浓度、温度、固液比、pH对副产石膏的转晶过程、转晶产物组成及结构的影响,并通过单因素实验以及正交实验得到最佳实验条件。结果表明:在共沸溶剂体积分数为70%、转晶温度为120 ℃、固液质量比为1∶6、pH为5、反应时间为3 h时可以制得长径比约为1∶1、抗折强度(2 h)为5.6 MPa、烘干抗压强度为43 MPa的α-半水石膏,满足JC/T 2038—2010《α型高强石膏》α40强度等级。

关键词: 副产石膏, α-半水石膏, 共沸回流法, 共沸溶剂

Abstract:

In order to eliminate the harm of by-product gypsum to the environment and improve the utilization value of by-product gypsum,the azeotropic reflux method was used to take industrial waste acid gypsum as raw material to obtain α-hemihydrate gypsum through slurry preparation,azeotropic solvent addition,crystal conversion reaction,and suction drying,and the best synthesis process of α-hemihydrate gypsum was explored.The product was characterized by X-ray diffractometer(XRD) and scanning electron microscope(SEM).The effects of azeotropic solvent concentration,temperature,solid-liquid ratio,and pH on the conversion process of by-product gypsum,the composition and structure of the conversion product were mainly researched,and the best experimental conditions were obtained through single-factor experiments and orthogonal experiments.The results showed that when the concentration of azeotropic solvent was 70%,the crystal transition temperature was 120 ℃,the solid-to-liquid ratio was 1∶6,the pH was 5,and the reaction time was 3 h,the aspect ratio could be about 1∶1,and flexural resistance could be obtained.The α-hemihydrate gypsum with a strength(2 h) of 5.6 MPa and a drying compressive strength of 43 MPa met the α40 strength grade of JC/T 2038—2010“α-type high-strength gypsum”.

Key words: by-product gypsum, α-hemihydrate gypsum, azeotropic reflux method, azeotropic solvent

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