METHOD OF NATURAL CALCIUM CARBONATE PROCESSING Russian patent published in 2000 - IPC

FIELD: inorganic materials. SUBSTANCE: invention relates to mineral resources processing. Method of processing natural calcium carbonate to crushed stone involves grinding and classification. Natural limestone containing 16-25% of lamellar and needle forms of calcium carbonate in total limestone volume is subjected for processing. In classification of fraction 0-70 mm to be sieved the end product is isolated that has mass part of 20-40 mm fraction 65%, not less, mass part of 40 mm fraction 20%, not above, and mass part less 20 mm fraction 20%, not above. Lime-stone of East-Pyatnitsky layer is preferable for using. Obtained crush stone is referred to the 1-st grade of quality. EFFECT: high quality of crushed stone. 2 cl, 1 ex