METHOD OF PREPARING MUD POWDER Russian patent published in 2003 - IPC

FIELD: sorbents. SUBSTANCE: invention provides mud powder for preparing drilling fluids, adsorbents and clay-based catalyst carriers, for purification of petroleum derivatives, clarification of vines and fruit juices, for preparing enterosorbents, etc. According to method of invention, mud powder is prepared from bentonite or palygorskite, or kaolinite clay by disintegrating raw material resulting in mechanical activation followed by thermal activation with gaseous heat carrier in thermal-shock mode at temperature of heat carrier from 150 to 550 C and heating velocity between 100 and 1000^oC/s. Bentonite clay utilized is in alkaline and alkali-earth forms. EFFECT: increased yield of drilling fluid from nonmodified mud powder. 4 cl, 3 tbl, 10 ex