METHOD OF PRODUCING MINERAL POWDER FOR ASPHALT CONCRETE MIXES Russian patent published in 1999 - IPC

FIELD: road construction. SUBSTANCE: method is based on modification of powder grains with organic substance by reduction in size of mineral component in the presence of organic component. Method is distinguished by the fact that source o mineral and organic components is used in the form of oil shale with 20-55% of kerogen, mineral part, the balance. Oil shale is subjected to mechanical activation at temperature of 10-50 C with grinding of 100% of particles to size of 0.5 mm, 95% of particles sizing less than 0.315 mm, and 85% of particles sizing less than 0.071 mm. Mechanical activation is effected in grinding devices at free impact or with crowded impact with attrition. EFFECT: higher quality of organomineral powder and simplified method of its preparation. 2 cl, 2 tbl