御影石から作製したβ-ウォラストナイト析出結晶化ガラス

概要

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Manufacturing process of glass-ceramic produced from waste granite was investigated for use as a construction material. Waste stone crushing is usually difficult, so waste stone is heated to 700℃ in an electric furnace, then cooled rapidly with water. Successively, the stone is crushed into particles smaller than 297 μm. Crushing and classification is repeated until over 90% of the waste stone product is reduced into fine particles. Batches were prepared by mixing a mass ratio of 100 fine particles waste stone, 50-60 limestone (CaCO_3), 5-15 soda-ash (Na_2CO_3), 3-8 anhydrous sodium sulfate (Na_2SO_4), 0.7-1.5 graphite (C) and 0-4 zinc oxide (ZnO). Black glass was produced by melting the batch at 1450℃ in an electric furnace, and allowed to flow on a steel plate. To form a nucleation, this glass was reheated at 850℃ for 1 h and reheated at 1050℃ for 2 h to form a glass-ceramic. Results of scanning electron microscope observation and powder X-ray diffraction of the obtained glass-ceramic showed β-wollastonite (CaO・SiO_2) to be the main crystal structure ; this is composed of about 2-3x10-20 μm prismatic crystals that are homogeneously entangled.
社団法人日本セラミックス協会の論文
1999-07-01