Inner-cooling inert anode for electrolytic aluminum

Abstract

The invention relates to an inert anode for electrolytic aluminum, and belongs to the field of electrolytic aluminum equipment. The inner-cooling inert anode for the electrolytic aluminum comprises a conductive rod and a metal or metal matrix composite anode connected with the conductive rod, wherein an inner cavity of the metal or metal matrix composite anode adopts a hollow structure, and is communicated with an external circulatory cooling system and a heat exchanger via a cooling medium inlet and a cooling medium outlet which are formed in the metal or metal matrix composite anode. The inert anode has the following advantages that 1, the advantages of excellent conductivity, thermal conductivity, machining property, uniform anode current distribution and the like of a metal inert anode are inherited; the defects that the metal inert anode pollutes molten aluminum during electrolytic aluminum production and is high in cost are overcome; 2, the advantages of good thermal stability of metal oxide ceramic and metal ceramic anodes and easiness in large-scale industrial application are provided; the defects that a metal oxide ceramic inert anode is poor in conductivity and low in thermal vibration resistance, and connection between the metal oxide ceramic inert anode and a metal component of a power supply system is difficult are overcome; and 3, the novel inert anode can fully meet a technical requirement of the electrolytic aluminum production, and is very small in consumption.

Description

technical field [0001] The invention relates to an inert anode for electrolytic aluminum, which belongs to the field of electrolytic aluminum equipment. Background technique [0002] An inert anode refers to an anode that is not consumed or consumed in a small amount during the electrolysis of cryolite-alumina molten salt during the electrolysis of aluminum. The inert anode has the advantages of improving the automation of the electrolytic cell, saving high-quality carbon, and not emitting carbon dioxide greenhouse gases. It can overcome the environmental protection and economic problems of traditional aluminum electrolysis, so it has become a hot spot and research focus in the aluminum industry. [0003] In recent years, in terms of the selection of anode materials, most studies have focused on metals, metal oxide ceramics, and cermets. As we all know: 1. Metal inert anodes have the advantages of excellent electrical conductivity, thermal conductivity, machining performanc...

AI Technical Summary

Problems solved by technology

However, under high temperature environment, metal ions will be reduced and deposited to the cathode aluminum liquid to affect the quality of primary aluminum, and the materials constituting the metal alloy anode generally contain precious metals such as nickel and cobalt, which are expensive and not suitable for large-scale production; 2. Metal oxide ceramics The solubility in cryolite molten salt is very low, it has good high temperature corrosion resistance, and has good thermal stability, low production cost, and is easy to produce on a large scale

However, the conductivity of metal oxide ceramics is not as good as that of metals and metal matrix composites. There are certain problems in the way metal oxide ceramic inert anodes are connected to the metal parts of the power supply system in the production of electrolytic aluminum. The method of welding is adopted, so the physical connection method is generally used now, which causes the physical pressure drop of the entire anode assembly to increase; 3. The metal-ceramic anode combines the advantages of metal and ceramics, but also introduces their own shortcomings, so many The problem cannot be solved technically

Mainly reflected in the poor thermal stability of the cermet anode, in the high temperature electrolyte, there will be layered shedding phenomenon

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