Aluminum electrolytic cell having cathode carbon block with columnar protrusions embedded on its upper surface

Abstract

An aluminum electrolytic cell having cathode carbon block with columnar protrusions embedded on its upper surface is disclosed. The columnar protrusions are arranged into two rows or three rows in the length direction of the upper surface of the carbon block. Two adjacent rows of columnar protrusions are crisscross arranged, and the columnar protrusions of the cathode carbon block are immersed in the aluminum liquid. The pot holes in the positions of the cathode carbon block substrate and the upper surface of the cathode carbon block substrate where columnar protrusions are embedded can be one-step molded by vibration molding or compression molding, and can be made by machining as well.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to the technical field of aluminum electrolytic cell, in particular to an aluminum electrolytic cell having cathode carbon block with columnar protrusions embedded on its upper surface.[0003]2. The Prior Arts[0004]At present, industrial pure aluminum is prepared by using an electrolysis method for molten cryolite alumina salts, and an anode of an electrolytic cell is composed of anode carbon blocks prepared from calcined petroleum coke. A cathode of the electrolytic cell is also composed of carbon blocks. The bottom of each cathode carbon block is provided with a steel bar, both ends of the steel bar are extended from the two sides of the electrolytic cell and are connected with a cathode bus, and one cathode carbon block is bonded to the other cathode carbon block by carbon paste.[0005]At present, most cathode carbon blocks of industrial aluminum electrolytic cells are made of anthracite w...

AI Technical Summary

Benefits of technology

The present invention provides an aluminum electrolytic cell with a cathode carbon block that has columnar protrusions embedded on its surface. This improves the resistance of the carbon block to the aluminum liquid and reduces the fluctuation of the aluminum flow and voltage. The method of embedding the protrusions is cost-effective and stable, and the cell can operate at lower voltage. The use of protrusions on the carbon block surface also allows for multiple substrate materials and reduces the amount of processing required.

Problems solved by technology

However, after the half-graphite, graphite and graphitized cathode carbon blocks are used as the cathode carbon blocks of the aluminum electrolytic cells, with the increase of the constituent content of artificial graphite in the cathode carbon blocks, the strength and erosion and corrosion resistance of the cathode carbon blocks to the aluminum liquid in the electrolytic cell become poorer and poorer.

Therefore, the graphite or graphitized cathode carbon block which is provided with protrusions on its surface cannot well meet the requirement of the aluminum electrolytic cell with irregular cathode structure to the life of the protrusions on its cathode surface.

In addition, the cathode carbon block of the aluminum electrolytic cell whose surface has horizontal protrusions perpendicular to the vertical direction of the cathode carbon block of the electrolytic cell has the disadvantages of large processing amount and high material consumption, thereby increasing the material cost, the processing cost and the production cost.

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