Apparatus for blending granular materials

摘要

Apparatus is disclosed for blending free-flowing granular materials comprising: an outer chamber having walls which converge toward and terminate in outlet means at the base thereof; substantially vertically-positioned fenestrated blending tube means spaced above said outlet means having a plurality of entrance means therein; solid, conveying tube means extending substantially vertically through and coaxial within said blending tube means and defining an annular space therebetween; an entrainment zone positioned between said base of said conveying tube means and the base portion of said chamber; and gas inlet means positioned in said chamber to discharge gas upwardly into and through said entrainment zone toward the base inlet of said conveying tube means; the distance of the point of gas inlet discharge into said entrainment zone from said base of said chamber is defined by the equation: