METHOD OF LIMESTONE PROCESSING Russian patent published in 2000 - IPC

FIELD: methods of processing of limestone used for production of lime applicable in chemical industry as process raw material and in metallurgical industry, as fluxes. SUBSTANCE: method includes crushing of ore mass to form sizing not in excess of 300 mm, dry concentration by grinding and classification to main product fraction of 70-150 mm in amount of 60- 70% of total weight of limestone, determination before burning of total mass fraction for each concrete fraction by formula X=100xMl/M, where X is total mass fraction of concrete fraction, %; Ml is limestone weight passed through screen with preset sizes of meshes, kg; M is weight of limestone sample, kg, and burning under condition of counterflow from top downward successively in three process zones: zone of heating with temperature up 900 C, zone of burning itself with temperature of 900- 1200 C, and cooling zone with temperature of 40-70 C. Carried out additionally is classification to fractions of 40-70 and 20-40 mm, with fraction of limestone lumps sizing above 150 mm amounting to not more than 5%, and those sizing less than 70 mm are not in excess of 30%. EFFECT: higher efficiency of process with higher quality of product. 4 cl