Low-shrinkage cathode paste

Abstract

The invention discloses a low-shrinkage cathode paste, which consists of dry ingredients and a binder, wherein the binder accounts for 16 to 20 percent of the total weight of the cathode paste and the dry ingredients account for 80 to 84 percent of the total weight of the cathode paste; and the dry ingredients comprise electrically-calcined coal, pitch coke and artificial graphite, the electrically-calcined coal accounts for 59 to 65 percent of the total weigh of the dry ingredients, the pitch coke accounts for 5 to 11 percent of the total weigh of the dry ingredients, and the artificial graphite accounts for 27 to 33 percent of the total weigh of the dry ingredients. The requirement on the granularity of a powder material in the electrically-calcined coal is that 200 mesh powder accountsfor 47 to 53 percent of the total weight of the powder material. The requirement on the granularity of a powder material in the pitch coke is that 200 mesh powder accounts for 47 to 53 percent of thetotal weight of the powder material. The requirements on the granularity of the artificial graphite are that the granularity of the artificial graphite is less than 4.5 millimeters, that a granular material accounts for 30 to 36 percent of the total weight of the artificial graphite, and that a powder material accounts for 64 to 70 percent of the total weight of the artificial graphite. Powder having a granularity of 200 meshes accounts for 47 to 53 percent of the total weight of a powder material in the artificial graphite. Compared with the prior art, the cathode paste has the advantages ofimproving the surrounding environment of an aluminum potroom, prolonging the service life of an aluminum cell, reducing cell voltage, energy consumption and production cost and the like due to reduced electrical resistivity, improved electrical conductivity and obviously reduced expansivity and shrinkage.

Description

Technical field: [0001] The invention belongs to the technical field of carbon products for aluminum electrolysis, in particular to a low-shrinkage cathode paste. Background technique: [0002] The large-scale electrolytic cell has become the development direction of modern aluminum electrolysis technology. Based on the comprehensive promotion and use of high graphite, all graphite and graphitized cathode carbon blocks, higher requirements are put forward for the performance and quality of cathode paste. . And the cathode paste produced at present is almost all made for common cathode carbon blocks and semi-graphite cathode carbon blocks with artificial graphite content of about 10%. This kind of cathode paste is used in the current aluminum electrolytic cell. Due to its poor electrical conductivity, thermal conductivity and sodium corrosion resistance, and the expansion and shrinkage rate of the binder before and after coking, it leads to early damage to the electrolytic c...

AI Technical Summary

Problems solved by technology

[0005] Provide a low-shrinkage cathode paste to improve the quality of the cathode paste to solve the problem of poor electrical conductivity, thermal conductivity and sodium erosion resistance of the cathode paste in the prior art, and high expansion and shrinkage of the binder before and after coking This leads to technical problems such as high early damage rate and high energy consumption of the electrolyzer