Conclusions
Rice husks are an effective combustible additive for making lightweight refractories. The first products obtained in Soviet industry using rice husks were BL-1.0 and BL-1.3 lightweights corresponding to GOST 5040-58. It is of interest to consider making industrial products from clays and ash. Although the bulk density is somewhat higher than that specified by GOST for BL-1.3 goods, in their heat conductivity they correspond to class BL-1.0. The compressive strength is 220 kg/cm2, the RUL is 1320°C. This makes them effective for lining heating units.
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Literature cited
Zlatanovic, Tehnica, No. 11 (1956), p. 1700.
M. A. Rabinovich et al., Production of thermal-insulating lightweight fireclay refractories [in Russian], Metallurgizdat (1959).
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Ol'khovskii, I.A., Sartakov, Y.A. Rice husks as a combustible addition for making lightweight refractories. Refractories 5, 92–95 (1964). https://doi.org/10.1007/BF01290464
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DOI: https://doi.org/10.1007/BF01290464