APPARATUS FOR HEAT TREATING CONTAMINATED PARTICULATE MATERIAL

摘要

An apparatus for heat treating contaminated particulate material and more particularly, an apparatus for reclaiming foundry sand. The apparatus includes a heated, inclined rotary drum and an auger projects into the upstream end of the drum and serves to feed material to the drum. The auger includes a spiral flight carried by a hollow shaft and a blower is connected to the outer end of the hollow shaft so that air is supplied through the shaft into the drum. A seal is provided between the non-rotating auger housing and the drum, and the seal includes an annular bearing plate mounted on the end of the drum while a sealing ring is connected to the auger housing and is biased against the plate to provide a seal. The excess air in the heated drum burns off the organic contaminates from the particulate material and calcines the mineral contaminates. The treated particulate material is transferred from the downstream end of the drum to a second cooling drum and air is passed through the second drum countercurrently to movement of the particulate material to cool the material.