Electric furnace for the production of metal oxides
AssigneeCoplosa, S.A.
InventorFrancisco Heras Cuenca
Life of this patent
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Abstract
The furnace comprises a tubular inner chamber for the treatment of the raw material, mounted inside the enveloping body of the furnace which is insulated from the exterior and is provided with internal resistor systems for heating the chamber of the furnace by radiation, comprising means for feeding raw material at one end and means for controlling the output of completed product at the other end of the treatment chamber of the furnace, inside which a worm screw, driven in rotation from the exterior, is mounted rotatably, respective percussion devices being incorporated in the ends of the screw to prevent compaction of the mass on the screw.
Claims9
- Electric furnace for the production of metal oxides, characterized in that it comprises a tubular inner chamber for the treatment of the raw material, mounted inside the enveloping body of the furnace which is insulated from the exterior and provided with internal resistor systems for heating the chamber of the furnace by radiation, comprising means for feeding raw material at one end and means for controlling the output of completed product at the other end of the treatment chamber of the furnace, inside which an helical screw, driven in rotation from the exterior, is mounted rotatably, respective percussion devices being incorporated in the ends of the screw to prevent compaction of the mass on the screw.
- Electric furnace for the production of metal oxides according to claim 1, characterized in that the screw for moving the raw material is composed of a central body to the outer surface of which are fixed sets of aligned vanes, arranged at an inclination so as together to form a helical screw for moving the mass to be treated.
- Electric furnace for the production of metal oxides according to claim 2, characterized in that the central body of the screw is formed with a square, prismatic shape by plates, welded together, forming its faces.
- Electric furnace for the production of metal oxides according to claim 1, characterized in that the heating resistors are disposed in respective sets in alignment on the side walls of the enveloping body of the furnace, on opposite sides of the tubular treatment chamber, and divided into a plurality of independently controlled longitudinal sections, permitting independent temperature adjustment points for adapting the furnace to different characteristics of the raw material and of the product to be produced.
- Electric furnace for the production of metal oxides according to claim 1, characterized in that the enveloping body of the furnace comprises insulating refractory masonry which also houses the heating resistors, the insulation being completed on top by high-density ceramic fibres.
- Electric furnace for the production of metal oxides according to claim 1, characterized in that each of the percussion devices mounted at the ends of the shaft of the central screw for moving the mass being treated is formed by a transverse tubular element in a symmetrical arrangement with respect to the axis of the screw and provided with shorter closed ends of predetermined inclination, inside which there are freely movable masses which can produce impacts during the rotation of the screw, preventing compaction of the mass being treated.
- Electric furnace for the production of metal oxides according to claim 1, characterized in that, at the input end of the furnace there is a worm-screw feeder for the input of raw material, also provided with an air inlet and, at the end for the output of the raw material, there is a gravity outlet and a rotary collector, and a respective air inlet and air outlet, controlled by respective valves.
- Electric furnace for the production of metal oxides according to claim 1, characterized in that the drive screw of the treatment chamber of the furnace is driven in rotation by means of a frequency variator which simultaneously controls the speed of rotation of the worm screw of the treatment chamber and that of the tubular raw-material feeder element.
- Electric furnace for the production of metal oxides according to claim 1, characterized in that it has a free extension system which takes up the expansions of the tubular chamber and of the movement screw resulting from the difference in temperatures produced inside the heating chamber.