The industrial sector has requirements for the chemical composition, fire resistance and particle size characteristics of kyanite products, but the standards are not completely uniform. Generally, it contains Al 2 O 3 >55%, Fe 2 O 3 <2%, K 2 O+Na 2 O<1% to 1.5%, TiO 2 <1%, refractoriness greater than 1790 ° C, high temperature linear expansion ratio and particle size relationship Great, the coarser the particle size, the higher the expansion rate.

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