Method and apparatus for blending water with sand

Abstract

A water blending apparatus for use in conditioning foundry sand. The apparatus creates a vertical sand stream flow path which increases the surface area of the sand stream and allows water to be applied to both sides of the sand stream rather than a single side, as known with conventional water mixing apparatus. In addition, the blending apparatus includes a housing inside which a pair of mixers thoroughly mix the wetted sand. Because the mixers are not positioned in-line with the main sand processing flow, as in conventional apparatus, the mixing time is not dependent upon the speed of the conveyor, and therefore mixing time may be increased. Furthermore, the agitators positioned inside the housing have a more efficient active area since a smaller clearance space is required than with over-the-conveyor style mixing devices, which must avoid contact with the conveyor belt. As a result, the sand may be cooled more quickly due to increased initial water coverage. Furthermore, the sand is cooled to a more uniform temperature since the blending apparatus more thoroughly mixes the sand and water, creating a more uniform moisture content in the sand. Still further, a post-cooling blending device may be used to introduce additional water to the sand stream, thereby activating bentonite or other materials added to the sand, which may require a higher moisture content.