METHOD OF PRODUCING FILLERS FOR BUILDING MATERIALS Russian patent published in 2017 - IPC C04B14/30 B22F9/16 

FIELD: chemistry.

SUBSTANCE: aluminium salt in the amount of 40 to 100 g/l is dissolved in a boiling aqueous solution of 10-50 wt % of carbohydrate, a disintegrant is added in the form of aluminium nitrate solution of 5-50 wt % with an aluminium content of up to 70-350 g/l, then the solution is evaporated to a brown mass of viscous consistency, the resulting mass is placed in a crucible and heated in a muffle furnace in air at a temperature of 250-400°C until the loss of mass ceases, after which the temperature is raised to 800-1200°C, and calcined until the carbohydrate burns out completely. Oxychloride, acetate and aluminium sulphate can be used as an aluminium salt, and cane sugar - as a carbohydrate.

EFFECT: preparing a filler for building materials in the form of aluminium oxide powder having a low bulk density, low thermal conductivity and high porosity.

3 cl, 3 ex, 3 dwg