Structure of combined cathode steel bar and cathode carbon block set

Abstract

The invention relates to an electrolytic tank in the aluminum electrolysis technology, in particular to a structure of a combined cathode steel bar and cathode carbon block set in the electrolytic tank. Cathode steel bars are fixed to the lower portion of a cathode carbon block through carbon paste binding or cast iron casting, the areas, exposed out of the lower portion of the cathode carbon block, of the cathode steel bars are cast through fireproof anti-seepage casting materials, the sections of the portions, close to the end of the cathode carbon block, of the cathode steel bars in cathode carbon block steel bar grooves become small, the spaces formed in the areas are filled with high-temperature-resistant compressible materials, and high-temperature-resistant compressible materials are arranged on the outer sides of the end parts of the cathode steel bars at the bottom of the middle part of the cathode carbon block. The structure has the advantages and effects that the horizontal current and the cathode voltage drop in molten aluminum are substantially reduced, a regular space can be formed at the end of the cathode carbon block, horizontal heat dissipation at the end of the cathode carbon block is effectively reduced, good furnace wall and stretching leg shapes can be formed advantageously, the magnetic fluid stability and the heat balance stability of the electrolytic tank are improved, the lining design and the heat balance design are conducted advantageously, and the probability of tank leakage at the position is substantially reduced.

Description

technical field [0001] The invention relates to an electrolytic cell in the aluminum electrolysis technology, in particular to a structure of a composite cathode steel rod and a cathode carbon block group in the electrolytic cell. Background technique [0002] The development trend of today's aluminum electrolysis technology is to focus on the large-scale and high stability of the electrolytic cell, and strive to pursue high current efficiency and low power consumption of the electrolytic cell. This development trend puts forward higher requirements for the design of the horizontal current in the aluminum liquid in the electrolytic cell and the pressure drop of the cathode group, and at the same time, the regional heat balance of the electrolytic cell should also be taken into account. The design of the cathode structure (or steel rod) is one of the current research hotspots. [0003] Patent CN101451249B proposes a cathode structure in which a conductor is arranged at or be...

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Problems solved by technology

[0003] Patent CN101451249B proposes a cathode structure in which a conductor is arranged at or below the cathode carbon block, and the current flows directly from the bottom of the tank, which can eliminate the horizontal current in the aluminum liquid from the source, but due to safety considerations, this method does not make much sense. Large-scale industrial application; patents CN102268695A and US6231745B1 propose to use high-conductivity copper or other high-conductivity materials to replace the cathode current collection method of steel rods or some steel rods, which can transfer the horizontal current from the aluminum liquid layer to the bottom of the cathode carbon block, reducing the Horizontal current in a small aluminum liquid, but this type of patent is difficult to meet the heat balance design requirements of the cathode steel rod; a large number of patents such as CN2892888Y, CN101545118B and CN102453927B adjust the resistance distribution of the cathode steel rod, usually to increase the resistance at the cathode steel rod head to force the current to flow vertically

This type of patent has a lot of horizontal heat dissipation at the end of the cathode, too long legs in the tank, and a complex structure at the end of the cathode, which is likely to cause the risk of leakage of the electrolytic cell

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