METHOD OF MAKING HYDROPHOBIC LIGHT-WEIGHT PEARLITE-BASED MICROSPHERES Russian patent published in 2014 - IPC C04B20/06 B01J20/16 

FIELD: chemistry.

SUBSTANCE: invention relates to inorganic fine materials, specifically to hollow glass-lined pearlite-based microspheres, and can be used in producing microspheres from other acidic hydroalumosilicates. In the method of making hydrophobic light-weight microspherical pearlite-based aggregate, which includes preparing a starting mixture, grinding said mixture, preparing a slurry, simultaneously moulding and drying granules, expanding said granules, the slurry is prepared by combined grinding of pearlite, ascharite, lithium carbonate and strontium carbonate in 2-3% NaOH solution to particle size of less than 5 mcm, with the following ratio of components, wt %: Ascharite - 2-4; lithium carbonate - 0.2-3; strontium carbonate - 0.2-3; pearlite - the balance, and the granules are moulded and dried by feeding the slurry through a sprayer with calibrated orifices into a tower-shaped spray dryer to obtain granules with moisture content of less than 0.9 wt % at the output.

EFFECT: obtaining hardened and hydrophobic granules.

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