The results of studies of the reduction of alkali metal oxides in nepheline sludge are presented. The alkali-containing phase is sodium hydroaluminosilicate. The methodology of the experimental studies involved the preparation of a water suspension with a given W:S ratio, mechanical stirring, heating, aging and separation of the pulp on a vacuum filter. Atechnology has been developed capable of reducing the alkali content by 21% of the initial amount of alkali, which has increased the melting temperature by 310°C. Based on the obtained results, pilot plant was designed and refractory heat-insulating materials were developed where the expensive mineral raw materials are substituted with non-scarce man-made waste.
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Translated from Novye Ogneupory (New Refractories), No. 3, pp. 55 – 57, March 2019.
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Nurgaliev, D.F., Sizyakov, V.M. & Utkov, V.A. Reduction of Alkali Content in Nepheline Sludge for the Production of Heat-Resistant Insulating Materials From it. Refract Ind Ceram 60, 174–176 (2019). https://doi.org/10.1007/s11148-019-00331-z
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DOI: https://doi.org/10.1007/s11148-019-00331-z