METHOD FOR CONTINUOUS SUPPLY OF ALUMINIUM ELECTROLYSER WITH ALUMINA AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC C25C3/14 

FIELD: non-ferrous metallurgy.

SUBSTANCE: invention relates to the production of aluminium by the electrolytic method, and can be used in the automated supply of alumina to the cell. The method includes continuous supply of alumina from the hopper to the melt, regulation of the amount of alumina supply and maintenance of the hole in the electrolyte crust not overgrowing, while the continuous supply of alumina is carried out through the opening of the dispenser nozzle, the supply of alumina to the surface of the melt is regulated using the pressure of compressed gas in the hopper, while the alumina is heated in the bunker and the heating chamber to a temperature sufficient to maintain the hole in the electrolyte crust open. Heating is carried out by the thermal energy of the heater, focused by the thermal reflector of the heating chamber. The device contains a bunker, a rotary feeder and means for regulating parameters for continuous supply of an aluminium electrolytic cell with alumina, and is also equipped with a dispenser consisting of a nozzle with a hole and a valve that regulates the closing of the hole, a gas pipeline, a pneumatic drive with a rod, a heating chamber in which a heater and a thermal reflector are located, while the bunker is made with a middle part and a conical part, covered on the outside with a heat insulator, a gas pipeline is connected to the middle part of the bunker, a dispenser is located in the conical part of the bunker, while the valve is interconnected with a pneumatic drive through a rod, and the dispenser nozzle is connected to a heating chamber in which heater and thermal reflector are located. It is possible to attach rods for turning alumina on the dispenser valve. The device can be equipped with a nut for adjusting the gap between the valve and the dispenser nozzle located on the pneumatic drive rod. The nozzle hole diameter is selected depending on the consumption of alumina consumed by the electrolytic cell.

EFFECT: possibility of heating alumina in the bunker and heating chamber, ensuring continuous supply of heated alumina to the electrolyte surface, creating a zone without closing of the hole in the crust, at the point of supply of the electrolyser with alumina, reducing the carryover of fluorides and alumina into the gas cleaning system, acceleration and complete dissolution of alumina without the formation of sediments on the bottom of the electrolytic cell.

5 cl, 2 dwg, 1 ex