Patent ID: 6700918
Filing Date: 2004-03-02
Classification: F27B,F27D,F27M

Abstract:
An electrical furnace for the production of metal oxides comprising a tubular inner treatment chamber for treatment of a raw material, mounted inside an enveloping body of the furnace and insulated from said enveloping body, wherein said inner treatment chamber is provided with internal resistor systems for heating said inner treatment chamber of the furnace by radiation, means for feeding raw material at one end of the treatment chamber and means for controlling output of completed product at another other end of the treatment chamber, helical screw is mounted rotatable inside said treatment chamber and driven in rotation from the exterior of said treatment chamber, and respective percussion devices are incorporated at ends of said helical screw to prevent compaction of the raw material and the completed product on said helical screw, wherein each of percussion devices mounted at ends of a shaft of the helical screw for moving the raw material being treated is formed by a transverse tubular element in a symmetrical arrangement with respect to the axis of the helical screw and provided with shorter closed ends of predetermined inclination, inside which there are freely movable masses which can produce impacts during rotation of the screw, preventing compaction of the raw material being treated.