Heat treating drum

Claim 1

Apparatus for the heat treatment of erosive material comprising a rotary drum having a cylindrical wall anD adapted to receive material to be treated; a plurality of wear plates on the inner surface of said wall and extending circumferentially about the wall to provide a liner; means for securing said wear plates to said wall, said wear plates being curved to conform substantially to the curvature of said wall and selected ones of said plates being spaced from one another at circumferentially spaced intervals; a plurality of uniform material lifting blades within said drum spaced circumferentially about said wall according to the spacing between said selected ones of said wear plates; and mounting means carried by each of said blades for mounting the latter on said wall, each of said mounting means comprising a foot occupying the space between said selected ones of said wear plates and having a planar surface confronting said wall, the wear plates on opposite sides of each space overlying the adjacent edge of the associated foot and clamping the latter against said wall, each of said lifting blades extending radially inwardly of said drum and having a radial length such that material lifted thereby in response to rotation of said drum falls in a haze.