CaO-P2O5-カオリナイト系における焼成反応過程
1978 年 1978 巻 152 号 p. 3-7
詳細
1978 年 1978 巻 152 号 p. 3-7
In the systems CaO-P2O5-kaolinite, the formation reactions of Ca3 (PO4) 2 and anorthite were kinetically investigated.
The amounts of Ca3 (PO4) 2 and anorthite formed were determined by the internal-standard analysis of X-ray diffraction. Velocity constants of the formation reactions and their apparent activation energies were calculated according to Jander's formula.
In the bodies consisting of CaHPO4·2H2O, CaCO3 and kaolinite where the reactions proceeded by the diffusion of Ca component, the formation of Ca3 (PO4) 2 was more predominant than that of anorthite. In the bodies containing hydroxyapatite and kaolinite, Ca3 (PO4) 2 and anorthite were obtained by the decomposition of apatite and the formation of Ca3 (PO4) 2 was rate-determining.
