Reduction of Alkali Content in Nepheline Sludge for the Production of Heat-Resistant Insulating Materials From it

  • D. F. Nurgaliev
  • V. M. Sizyakov
  • V. A. UtkovEmail author

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.


heat resistant thermal insulation material man-made waste nepheline sludge mineral raw materials 


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • D. F. Nurgaliev
    • 1
  • V. M. Sizyakov
    • 1
  • V. A. Utkov
    • 1
    Email author
  1. 1.Saint Petersburg Mining UniversitySaint PetersburgRussia

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