METHOD OF PRODUCING CERAMIC PROPPANTS Russian patent published in 2012 - IPC C09K8/80 C04B35/622 

FIELD: oil-and-gas production.

SUBSTANCE: proposed method grinding raw mix, pelletizing fine batch, sieving preset-size granules, their drying, annealing and classification. Batch pelletising is performed in turbine mixer for 6-35 s at high-intensity circular motion of bulk that ensures normal acceleration of particles to 500-2500 m/s² with batch moistening for 50-90% of normal level, and, after maturing for 0.5-6 min, granules are shaped to required sphericity in dish noduliser with addition of remaining amount of moistening solution. Proposed invention is developed in dependent claims.

EFFECT: higher yield and strength.

4 cl, 4 tbl