This work seeks to validate two-dimensional CFD simulations of gas(-) solid-fluidized beds of two Geldart Group B industrial powders, natural and synthetic rutile used in the titanium-refining industry, using a commercial code CFX-4.4. Experimental data on bed height, bubble diameter, and bed voidage are compared with those from simulations. Both qualitative and quantitative results are presented in this paper. Results obtained on bubble diameters from simulations are also compared with predictions using the semiempirical correlation by Darton et al.(1).