INORGANICCHEMICALSINDUSTRY ›› 2012, Vol. 44 ›› Issue (8): 19-.

Previous Articles     Next Articles

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

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

CLC Number: