METHOD FOR PREPARING URANIUM CONCENTRATES BY FLUIDISED BED PRECIPITATION, AND PREPARATION OF UO3 AND U3O8 BY DRYING/CALCINING SAID CONCENTRATES

摘要

process for preparing a concentrate of uranium in the form of particlessolids by precipitation from a solutionsoon, with the help of a precipitating agent in a reactor (1).(7) comprising a base, a top partpower plant (2) and an upper part (3), and a lower part (6).solid particles of uranium concentrate to form a bed.under the action of a fluid flowing in the fluid power(7) to the top of the reactor (1) throughin the lower part (6), the central part (2) and the partmore than (3) of the reactor (1) and which is created bythe introduction to the base (7) of the reactor (1) for a fluid recycling(11) from a first level (a)the upper part (3) of the reactor and returned to base without being settled(7) of the reactor (1), an excess of liquid was alsoevacuated through an overflow (10) located at a second level.(b) fixed in the upper part of the reactor; and (3)a process in which the upper end (c) of a fluidized bed of particlessolids is controlled so as to be at a levellower than the first and second levels determined.