Abstract
In order to utilize industrial wastes, the authors studied a method of producing cordierite-type glass-ceramic using coal stone as the major raw material with the addition of ilmenite as the crystallization catalyst. The glass samples were prepared by melting mixtures of coal stone, serpentine, bauxite and ilmenite. The process of catalyzed crystallization in FeO-containing glasses near the cordierite composition was investigated by means of XRD, DTA, and EM. The results show that it is possible to produce good-quality glass-ceramics from coal stone. In the Fe-containing cordierite-type glasses, TiO 2 can catalyze nucleation and crystallization by promoting phase separation. The formation of high-cordierite is completed through the peritectic reaction of orthopyroxene and spinel rather than through the structured change of a metastable quartz-like phase and μ-cordierite.
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