METHOD OF OBTAINING FIRE-EXTINGUISHING POWDER COMPOSITION Russian patent published in 2014 - IPC A62D1/00 

FIELD: chemistry.

SUBSTANCE: method of obtaining a fire-extinguishing powder composition includes separate crushing of ammonium phosphate in the presence of silicon dioxide and polyorganohydride siloxane with a weight ratio 90-97, 2.5-5, 0.5-5% and ammonium sulphate with their further mixing. After a stage of crushing ammonium phosphate with a fraction size smaller than 50 mcm is mixed with an additive of highly condensed ammonium polyphosphate in an amount of 1-5% with a particle size, which does not exceed 50 mcm, and ammonium sulphate with a fraction size 50-200 mcm. Crushing of both components is performed in a mill with shock-shear type of loading, in which the quantity of energy supplied to ammonium phosphate constitutes 105-263 J/g, to ammonium sulphate - 13-26 J/g. The invention provides a method of obtaining a multi-purpose fire-extinguishing powder with an increased fire-extinguishing ability, high indices of apparent bulk density and hydrophobicity, namely a water-proof ability.

EFFECT: method of obtaining makes it possible to reduce energy consumption at the stage of the powder component crushing and obtain the product with a certain fraction composition of a carrier and an extinguishing fraction.

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