Process for preparing aluminum electrolysis inert anode material or aluminum electrolysis inert cathode coating material

Abstract

The invention provides a process for preparing an aluminum electrolysis inert anode material or an aluminum electrolysis inert cathode coating material. The process comprises the following steps of: (A), placing aluminum into a reactor, vacuumizing the reactor, introducing an inert gas, raising temperature to 700 to 800 DEG C, adding a dry fluoroborate and fluorozirconate mixture into the reactor, quickly stirring the mixture, performing reaction for 4 to 6 hours, extracting molten liquid in an upper layer, and obtaining zirconium boride in a lower layer; and (B), melting the obtained zirconium boride and a carbon material, tamping a molten product onto the surface of a carbon cathode, and sintering the carbon cathode to obtain the aluminum electrolysis inert cathode coating material; or uniformly mixing the obtained zirconium boride and the carbon material, forming the mixture under the pressure of 1,000MPa, and sintering the formed mixture at 2,000 DEG C to form the aluminum electrolysis inert anode material. The process is simple, free of severe reaction conditions and high in reaction product yield, and the preparation requirements of the aluminum electrolysis inert anode material or the aluminum electrolysis inert cathode coating material can be met.

Description

technical field [0001] The invention relates to a preparation process for an inert anode material or an inert cathode coating material for aluminum electrolysis. Background technique [0002] At present, the aluminum electrolysis industry still adopts the traditional Hall-Heroult method. The electrolyte has always been based on cryolite-alumina. The current prebaked anode electrolytic cells mainly use carbon anodes and carbon cathodes. The precipitated oxygen is continuously consumed, transformed into carbon monoxide and carbon dioxide, and discharged into the atmosphere. The carbon cathode is not wet to the aluminum liquid, and will be corroded by cryolite for a long time. In order to prolong the service life of the electrolyzer, reduce the carbon emissions to the atmosphere, reduce the electrolysis temperature, and improve the electrolysis efficiency, it is often necessary to prepare cheap and large-scale industrially produced inert anode materials or prepare carbon cathod...

AI Technical Summary

Problems solved by technology

[0009] Zirconium boride has good wettability to aluminum liquid and is resistant to cryolite corrosion, but the existing industrial production methods of zirconium boride have harsh reaction conditions, and the reaction yield is not high (less than 90%). Comprehensive preparation Disadvantages of high cost

Due to the high price of zirconium boride, it is difficult to realize the wide application of zirconium boride in the preparation process of inert anode material or inert cathode material