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 ›› 2020, Vol. 52 ›› Issue (10): 130-134.doi: 10.11962/1006-4990.2019-0593

• 环境·健康·安全 • 上一篇    下一篇

盐溶液种类和浓度对α-半水脱硫石膏合成的影响

陈平1,2,3(),田宇3,胡成1,2,3()   

  1. 1.桂林理工大学,广西建筑新能源与节能重点实验室,广西桂林 541004
    2.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
    3.武汉科技大学,省部共建耐火材料与冶金国家重点实验室
  • 收稿日期:2020-04-25 出版日期:2020-10-10 发布日期:2020-11-24
  • 通讯作者: 胡成
  • 作者简介:陈平(1964— ),男,博士,教授,主要从事水泥材料新装备开发、绿色生态建材研究,已发表文章60余篇;E-mail: chenping8383@188.com
  • 基金资助:
    国家重点研发计划(2016YFB0303501);国家自然科学基金(51362007);广西建筑新能源与节能重点实验室开发基金(桂科能19-J-22-3)

Effect of type and concentration of salt solution on synthesis of α-semi-water desulfurization gypsum

Chen Ping1,2,3(),Tian Yu3,Hu Cheng1,2,3()   

  1. 1. Guangxi Key Laboratory of New Energy and Building Energy Saving,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
    3. The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology
  • Received:2020-04-25 Online:2020-10-10 Published:2020-11-24
  • Contact: Hu Cheng

摘要:

为了解决脱硫石膏的大量堆存对环境造成的潜在危害,同时提高脱硫石膏的附加值,采用常压盐溶液水热法以电厂脱硫石膏为原料探究α-半水石膏的最佳合成工艺,重点研究了盐溶液种类及浓度对α-半水石膏的合成过程、合成产物组成及结构的影响。结果表明:在氯化钙、氯化镁盐溶液中,由于同离子效应和硫酸镁离子对的形成,导致半水石膏的形成过程受阻。较高浓度氯化钾和氯化钠盐溶液可使二水石膏发生转晶,其中氯化钾会致使半水石膏过度脱水生成无水钾石膏,氯化钠盐溶液可以使二水石膏转变为半水石膏并维持较长时间,通过比较得出最佳合成工艺为氯化钠溶液质量分数为15%、体系反应温度为95 ℃、固液质量比为1∶4、搅拌速率为150 r/min、合成时间为3 h,可以制得长径比约为5∶1的六方短柱状α-半水石膏。

关键词: 水热法, 盐溶液种类, 盐溶液浓度, α-半水石膏

Abstract:

In order to solve the potential harm to the environment caused by the large amount of desulfurization gypsum,improve the added value of desulfurization gypsum,the atmospheric salt solution water thermal method was used to explore the optimal synthesis process of α-hemihydrate gypsum with the desulfurization gypsum of power plant as raw material.The effect of salt solution type and concentration on the synthesis process,synthesis product composition and structure of α-semi-water desulfurization gypsum was studied.The results showed that in the CaCl2 and MgCl2 salt solutions,the formation process of hemihydrate gypsum was hindered due to the same ion effect and the formation of magnesium sulfate ion pairs.The higher concentration of KCl and NaCl salt solution can transform the dihydrate gypsum,wherein KCl will cause the hemihydrate gypsum to be excessively dehydrated to form anhydrous potassium gypsum.The NaCl salt solution can convert the dihydrate gypsum into hemihydrate gypsum and maintain it for a long time.By comparing the optimal synthesis process was obtained as follows:NaCl solution mass fraction was 15%,system reaction temperature was 95 ℃,mass ratio of solid to water was 1∶4,stirring rate was 150 r/min and synthesis time was 3 h.Under the conditions,hexagonal short columnar α-hemihydrate gypsum with an aspect ratio of about 5∶1 was obtained.

Key words: hydrothermal method, type of salt solution, concentration of salt solution, α-hemihydrate gypsum

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