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 ›› 2012, Vol. 44 ›› Issue (8): 19-.

• 论文 • 上一篇    下一篇

氟化钙对共沉淀法硅酸三钙中游离氧化钙含量的影响

赵慧娟,刘 璨,王 凯,杨 洪   

  1. 河南师范大学生命科学学院,河南新乡 453007
  • 发布日期:2012-08-10

Effect of CaF2 on content of free CaO in tricalcium silicate by co-precipitation process

 ZHAO  Hui-Juan, LIU   Can, WANG   Kai, YANG   Hong   

  1. School of Life Science,Henan Normal University,Xinxiang 453007,China
  • Published:2012-08-10

摘要: 以硝酸钙、硅酸钠、碳酸钠、氟化铵为原料,采用共沉淀反应法制备掺杂氟化钙的硅酸三钙。研究不同氟化钙掺杂量对合成硅酸三钙中游离氧化钙含量的影响。用甘油无水乙醇法测定游离氧化钙的含量,扫描电子显微镜(SEM)和X射线分析(XRD)对硅酸三钙的微观形貌和晶相组成进行表征。结果表明,氟化钙的加入使得样品在煅烧过程中形成了低共融化合物,明显降低了游离氧化钙的含量,缩短了反应时间,降低了煅烧温度,氟化钙掺杂量为0.6%(质量分数)时,在1 350 ℃下保温4 h可以得到游离氧化钙含量很低的硅酸三钙。

关键词: 氟化钙, 硅酸三钙, 游离氧化钙

Abstract: Calcium fluoride-doped tricalcium silicate(3CaO·SiO2,C3S) were synthesized by co-precipitation process with calcium nitrate tetrahydrate[Ca(NO32·4H2O],sodium silicate nonahydrate(Na2SiO3·9H2O),sodium carbonate(Na2CO3), and ammonium fluoride(NH4F) as raw materials.Effects of different doping amounts of CaF2 on the content of free CaO(f-CaO) in the synthesized C3S were investigated.The content of f-CaO in C3S was determined by glycol-anhydrous alcohol method,and the micro morphology and phase composition of C3S were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM).Results indicated that the addition of CaF2 caused the formation of eutectic mixture,apparently reduced the content of f-CaO,shorten the reaction time and decreased the sintering temperature;and while the doping content of CaF2 (mass fraction) was 0.6%,C3S with little f-CaO could be obtained at 1 350 ℃ for 4 h.

Key words: calcium fluoride, tricalcium silicate, free calcium oxide

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