Abstract: A blender for mixing slurries, suspensions and the like that include particulate solids in a liquid characterized by a plurality of blades disposed along a bottom mixing zone of an elongate central shaft, the blades being fixedly connected with the shaft and extending radially outwardly therefrom and balanced to minimize rotational vibration; the blades all having a twist therealong. A bottom blade is twisted so that the outer radial portions have a critical angle .alpha. with the trailing edge tilted upwardly for moving the solids radially outwardly and upwardly. A second blade at the top of the mixing zone is bent downwardly and also has a twist, the angles of bend and twist being such that the solids are forced radially inwardly and downwardly to a plurality of mixing blades therebelow and splash is prevented. An intermediate mixing blade is provided with critical angles on the outer radial portions for mixing and forcing the solids downwardly.