K2O-Al2O3-SiO2-B2O3-RO系からのカルシライトの析出

Kalsilite (K2O⋅Al2O3⋅2SiO2) which was not known to crystallize out of the three-component melt of K2O, Al2O3, and SiO2, was found to crystallize from the system K2O-Al2O3-SiO2-B2O3-RO, wherein B2O3 and RO acted as the minerallizer for kalsilite. The crystallizing regions of kalsilite and of orthorhombic kaliophilite and the glassifying region in the system were investigated.The results obtained were as follows:a) Mixtures in the region richer in SiO2 than K2O⋅2SiO2 and not so aluminoferous were usually glassified.b) Orthorhombic kaliophilite was crystallized from the melt which is poorer in B2O3 than K2O⋅Al2O3⋅2SiO2⋅0.3B2O3, whether associated with RO or not.c) In the system of K2O⋅Al2O3⋅2SiO2-B2O3 the mixtures in the region richer in B2O3 than K2O⋅Al2O3⋅2SiO2⋅0.4B2O3 were easily glassified, while addition of RO caused the glassified region to change into the crystallizing region of kalsilite.d) The larger was the radius of R2+ ion, the more effectively it acted as minerallizer.