Electrolytic cell for producing primary aluminum by using inert anode

摘要

An electrolytic cell for producing primary aluminum by using inert anodes is disclosed, in which an electrolyte system KF—NaF—AlF3 is used and the operating temperature of the cell is 700-850° C. The electrolytic cell comprises a cell shell, heat insulating refractory lining, a melting pot, a heat insulating cover, inert electrodes, electrode stems, anode bus-bars, cathode bus-bars, anode branching bus-bars, heat insulating plates, partitions between anodes and cathodes and a feeding device. The quality of the aluminum product obtained by using the electrolytic cell is not less than 99.7%. The cell is free from emission of carbon dioxide and perfluorinated compounds (PFCs), and hardly has consumption of electrodes, so the distances between anodes and cathodes can be kept stable. The cell is sealed and the volatilization of dust and fluorides can be prevented, and it is useful to recover oxygen gas.

主权项

1. An electrolytic cell for producing primary aluminum by using inert anodes, wherein the electrolytic cell comprises a cell shell, at least one group of column electrodes fixed in the electrolytic cell, a bus-bar, at least an electrode stem, a heat insulating plate, a partition disposed between anode and cathode, and used to fix electrodes, seal and insulate heat and disposed between anode and cathode, and a sealing plate; said electrode group comprises at least 2 electrodes;
single said electrode comprises an inert anode and a cathode, which is arranged in the form of “-inert anode-cathode-inert anode-” or “-cathode-inert anode-cathode-”; said bus-bar comprises an anode bus-bar, a cathode bus-bar, an anode branching bus-bar and a cathode branching bus-bar; the anode branching bus-bar and the cathode branching bus-bar of said electrode group are arranged in the form of “-anode branching bus-bar-cathode branching bus-bar-anode branching bus-bar-” or “-cathode branching bus-bar-anode branching bus-bar-cathode branching bus-bar-”; single said electrode is connected with said anode branching bus-bar or said cathode branching bus-bar through said electrode stem; said heat insulating plate is fixed above said inert anode and said heat insulating plate is provided with via holes, through which said electrode stem can pass through said heat insulating plate; said partition between anode and cathode is fixed under said sealing plate and in the middle of the electrodes, and it is closely arranged with said heat insulating plate, so as to ensure the electrode distance; and said sealing plate is overlapped between said anode branching bus-bar and said cathode branching bus-bar and is compacted on the anode branching bus-bar and the cathode branching bus-bar by means of the weight of the partition between anode and cathode; wherein further comprising a cell lining, said cell lining is built with refractory and heat insulating material coating, and the inside cavity of the upper end of said cell lining is in an expanding diameter step shape; wherein further comprising a melting pot, said melting pot is located in the middle part of the cell; and the outer wall of said melting pot is fitted with said cell lining; and wherein there is a storage aluminum pool at one end of said melting pot bottom, said storage aluminum pool is connected with an aluminum collector groove fixed under a cathode shadow through a diversion groove, the bottom of said melting pot is an inclined plane through which molten aluminum can flow into the diversion groove fixed in the middle part or at both sides of the melting pot and can be collected into the storage aluminum pool.