ROTARY CONTINUOUS-ACTION FURNACE Russian patent published in 1998 - IPC

FIELD: multiple-stage treatment of materials in rotating drums for drying and thermic decomposition of heavy metal salts. SUBSTANCE: furnace is provided with two rings mounted in cavity of drum by means of rods with screw winding and having cone finned outer surface. Fins are arranged tangentially relative to said surface and form together with inner surface of drum annular sectors with cross section whose size is less than that of gap between said rods and inner surface of drum. Radius value of outer cone surface of said rings decreases in direction of motion of treated material. Radius value of said screw winding of rods decreases in direction opposite relative to motion of treated material. EFFECT: enhanced efficiency of drying process and thermic decomposition, manufacture of products with predetermined grain-size characteristics and homogeneous chemical content. 2 dwg