Kaolins of the prosyanovskoe and Kyshtymskoe deposits as raw materials for synthesizing cordierite
Phase formation in heat treatment of a cordierite charge consisting mainly of talc, alumina, and Kyshtymskoe kaolin is investigated. It is shown that in the temperature range 900 – 1200°C the shrinkage of the cordierite charge is mainly determined by the amount and grade of the kaolin introduced. At higher temperatures the shrinkage is influenced by the reactions of formation of mullite (slower increase in the density) and cordierite (loosening of the structure). It is inferred that in producing cordierite articles by a one-stage technology kaolins depleted of kaolinite are preferable.
KeywordsAlumina Heat Treatment Shrinkage Kaolinite Phase Formation
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