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 ›› 2016, Vol. 48 ›› Issue (4): 31-.

• 论文 • 上一篇    下一篇

杂质对石膏晶须制备的影响

王 微,刘代俊,陈建钧   

  1. 四川大学化学工程学院,四川成都 610025
  • 出版日期:2016-04-10 发布日期:2016-04-27

Influence of impurities on preparation of gypsum whiskers

 WANG   Wei, LIU  Dai-Jun, CHEN  Jian-Jun   

  1. School of Chemical Engineering,Sichuan University,Chengdu 610065,China
  • Online:2016-04-10 Published:2016-04-27

摘要: 探讨了Mg2+、Al3+和Fe3+杂质对硫酸与氯化钙反应生成的硫酸钙晶须的影响。研究表明,当温度由80 ℃升温到102 ℃时,产品由二水硫酸钙晶须转变为半水硫酸钙晶须;搅拌速度、反应物浓度、反应时间对晶须的形成影响不显著。Mg2+、Al3+和Fe3+对硫酸钙晶须的生长均有抑制作用,相同浓度下,抑制能力为Fe3+>Al3+>Mg2+;低浓度的Fe3+或高浓度的Al3+能使得晶须的形貌发生明显的变化;在全离子的作用下,晶须形貌由针状变为雪花状,并在其表面有絮状附着物。

关键词: 硫酸钙, 晶须, 反应结晶, 形态学

Abstract: The effects of Mg2+,Al3+,and Fe3+ on the calcium sulfate whisker produced by the reactive crystallization between sulfuric acid and calcium chloride were investigated.Results showed that the whisker was slightly influenced by stirring speed,reactant concentration,and reaction time.The calcium sulfate whisker transformed from dihydrate to hemihydrate when the temperature increased from 80 ℃ to 102 ℃.And the crystallization of gypsum was controlled by Mg2+,Al3+,and Fe3+.The inhibition ability was Fe3+>Al3+>Mg2+ at the same concentration.The morphology of whisker was obviously changed at low Fe3+ concentration or high Al3+ concentration.The morphology of whisker transformed from needle-like to flake-like shape and the appearance of flocculent attachments at the surface when all the above metal ions existed in the solution.

Key words: calcium sulfate, whisker, reactive crystallization, morphology

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