METHOD FOR DRY GRINDING ONE OR MORE MINERAL MATERIALS CONTAINING AT LEAST CALCIUM CARBONATE Russian patent published in 2012 - IPC C09C3/10 C09C1/02 B02C19/00 

FIELD: chemistry.

SUBSTANCE: invention can be used in inorganic chemistry. The method for dry grinding one or more mineral materials containing at least calcium carbonate involves steps for crushing the mineral material in a crushing unit to obtain crushed material with diameter d₉₅ less than 10 cm, dry grinding the crushed material in a grinding unit in the presence of at one hydrophilic comb polymer containing at least one polyalkylene oxide group, grafted onto at least one ethylenically unsaturated monomer. Dry grinding is carried out such that the amount of liquid in said grinding unit is less than 15% of the weight of said crushed material in the grinding unit. The obtained material has mean diameter d₅₀ from 0.5 to 500 mcm.

EFFECT: invention enables to grind mineral material without using a large amount of volatile organic compounds, without changing properties of the end product.

59 cl, 7 tbl, 5 ex