The results of studies of the phase formation process of enriched primary kaolins of the Angren and Samarkand fields during firing in the range of 1250‒1400 oC are presented. It is shown that the stability of the phase composition, the optimal ratio of the crystalline phases, shrinkage and water absorption indices allow us to consider the enriched kaolin of the Samarkand field as a promising material for making chamotte lightweight refractories. Ill. 3. Ref. 11. Tab. 3.
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