Connection structure and preparation method of cermet-based inert anode and guide rod for aluminum electrolysis

Abstract

The invention belongs to the technical field of aluminum electrolysis, and discloses a connection structure and a preparation method of a cermet-based inert anode and a guide rod for aluminum electrolysis. The connection structure is composed of a cermet-based inert anode, an intermediate alloy ingot and a metal conductive rod. The invention realizes the high-strength and stable conductive connection between the cermet-based inert anode for aluminum electrolysis and the metal conductive rod, the process is simple, the operation is convenient, the connection structure has good corrosion resistance, low cost, stable connection, and high strength at room temperature and high temperature. The connection structure prepared by the process method of the present invention can withstand the impact of long-term strong heat, electricity and hot corrosive gases. Loading 0~20A / cm 2 the current density. The method of the invention is of great significance for realizing the industrialized electrolysis application of the cermet-based inert anode.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, and relates to a preparation method for stably connecting a cermet-based inert anode for aluminum electrolysis with a metal conductive rod. Background technique [0002] There are many problems with the carbon anode currently used in the aluminum electrolysis industry: the carbon anode reacts during the electrolysis process, and a large amount of greenhouse gas CO is emitted. 2 And carcinogenic carbon fluorine compounds, etc., seriously pollute the environment; for every 1kg of aluminum produced, the actual consumption of carbon is about 0.42-0.65kg, resulting in a large consumption of high-quality carbon materials; the high frequency of anode replacement interferes with the thermal balance of the electrolytic cell, resulting in huge energy Consumption, and high labor intensity; there are many carbon residues in the electrolytic cell, and the consumption of fluorine salt is high, wh...

AI Technical Summary

Problems solved by technology

[0002] There are many problems with the carbon anode currently used in the aluminum electrolysis industry: the carbon anode reacts during the electrolysis process, and a large amount of greenhouse gas CO is emitted. 2 And carcinogenic carbon fluorine compounds, etc., seriously pollute the environment; for every 1kg of aluminum produced, the actual consumption of carbon is about 0.42-0.65kg, resulting in a large consumption of high-quality carbon materials; the high frequency of anode replacement interferes with the thermal balance of the electrolytic cell, resulting in huge energy Consumption and high labor intensity; there are many carbon slags in the electrolytic cell, and the consumption of fluorine salt is high, which affects the stable operation of the electrolytic cell; the uneven consumption of the bottom surface of the anode makes the distribution of the anode current uneven, and the stability of the electrolysis process is affected

Among them, the curing process of the adhesive needs to be kept warm in sections at different temperatures for a long time, and the process is cumbersome, which brings inconvenience to practical application.

In addition, brazing and diffusion welding are also commonly used to realize the connection between the conductive connecting rod and the inert anode. These two methods have certain problems in terms of corrosion resistance of the connection interface, thermal stability and electrical connection stability.

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