METHOD OF PROCESSING BURNT ROCK TO PRODUCE CONCRETE MIX FILLER AND CONCRETE MIX WITH SAID FILLER Russian patent published in 2012 - IPC C04B18/12 C04B28/04 

FIELD: process engineering.

SUBSTANCE: proposed method comprises the following steps. Burnt rock is crushed to size not exceeding 50 mm. Crushed burnt rock is sieved at 20 mm-mesh screen. Crushed burned rock that passed through screen is rejected. Crushed burnt rock remained on screen is crushed again to sieve it at screens with smaller meshes and to separate it into sand and gravel fractions. Said sand and gravel fractions are placed into separate bins. Said fractions are fed into concrete mixer as concrete fillers.

EFFECT: invention facilitates reducing content of bad compounds and organic impurities, optimised composition.

10 cl, 2 tbl