氟化钙对共沉淀法硅酸三钙中游离氧化钙含量的影响  

Effect of CaF_2 on content of free CaO in tricalcium silicate by co-precipitation process

作　　者：赵慧娟[1] 刘璨[1] 王凯[1] 杨洪[1] 

机构地区：[1]河南师范大学生命科学学院,河南新乡453007

出　　处：《无机盐工业》2012年第8期19-21,共3页Inorganic Chemicals Industry

基　　金：河南省自然科学基金(0411031900);河南师范大学大学生国家级创新实验资助项目

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。Calcium fluoride-doped tricalcium silicate （3CaO. SiO2, C3S） were synthesized by co-precipitation process with calcium nitrate tetrahydrate [ Ca （NO3） 2· 4H201, sodium silicate nonahydrate （Na2SiO3 · 9H20 ）, 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 scan- ning electron microscopy （SEM）.Results indicated that the addition of CaF2 caused the formation of eutectic mixture, appar- ently 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 C for 4 h.

关 键 词：氟化钙 硅酸三钙 游离氧化钙 

分 类 号：TQ132.32[化学工程—无机化工]