Abstract
Fire resistant stone (FRS) in Niizima island of Tokyo consists mainly of glassy aluminosilicate.
The purpose of this work is to study developing a new use for FRS. A high quality soda-lime glass (FRS glass) was prepared from the crashed FRS which passed through a screen of 32 mesh. The batch composed of 100 parts of FRS, 25 parts of limestone and 30 parts of soda ash by weight, melted easily in a crucible at 1450°C. Neither stone nor cord appeared in the glass. Furthermore, when only 0.2 wt% antimony oxide with oxidizing agent was added in the batch, the glass became almost seed-free. Melting rate of the batch with FRS became 30% higher than batch with general raw meterial. FRS glass was slightly short glass, but could be formed in the same manner as soda-lime glass in the market. Hydrolytic resistance of FRS glass was particularly superior to that of soda-lime glass in the market. Amber glass and heat-absobving glass could be produced at a low cost with FRS as a main raw material.
