Abstract: Twelve narrow fractions of uranium ore sand and slime with average diameters dp= 32-460μm(35 to 600 mesh) and densities ρs = 2.58-2.63g/cm3 were fluidized at ambient temperature with water. Bed expansion relation for flui-dization was determined experimentally in the range of voidage ε = 0.530-0.957. The obtained curves for IgRe versus 1 + lgε are all nonlinear. Using two strai-ghtline sections, we approximated the curves, and determined two corresponding terminal velocities vt1 and vt2, and two voidage exponents n1 and n2, as well as bed voidage εc at the intersecting point of the two straight-line sections, the minimum fluidization velocity Umf and the bed voidage εmf at incipient flui-dization for each fraction. By regressive analysis the empirical formulas were obtained for calculating the above fluidization parameters in the range of Archimedes number from 0.6 to 1700. By comparing spherical particles with some non-spherical particles, the fluidization characteristics and relationship for the irregular particles of the uranium ore are discussed.

摘要： 本工作系于室温下,用水流化35至约600目的12种窄粒级含铀矿粒和矿泥(平均粒径d_p=32—460μm,比重为2.58—2.63),在空隙率ε=0.530—0.957的范围内,测定了床层的膨胀特性.由于实验所得lgRe～1+lgε为非线性关系,作者采用双直线代表这一曲线,并相应地确定了各粒级矿粒和矿泥的第一和第二终端速度V_t1、V_t2,第一和第二空隙率指数n_1、n_2,两线折点空隙率ε_c,最低流化速度U_mf和最低流化点空隙率ε_mf.通过回归分析,在阿基米德数Ar=0.6—1700的范围内,求得了该不规则矿石的流化关系式.本文还对比球形和非球形物料,讨论了这种不规则矿石的流化特性和流化关系式.