A surface treatment process for the bottom of an aluminium electrolytic cell

By using a surface treatment process on the refractory bricks at the bottom of the aluminum electrolysis cell to form a dense resistive layer, the problem of easy corrosion of refractory materials is solved, thereby improving the service life and electrolysis efficiency of the aluminum electrolysis cell.

CN120229964BActive Publication Date: 2026-01-02HENAN RUIXIN ENERGY SAVING TECH CO LTD
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Patent Information

Application Number
CN202510398758.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-04-01
Publication Date
2026-01-02
Estimated Expiration
2045-04-01

AI Technical Summary

Technical Problem

The refractory material at the bottom of existing aluminum electrolytic cells is easily corroded under the action of high-temperature electrolyte and molten aluminum, leading to structural damage, unstable current, aluminum penetration, reduced thermal efficiency of the electrolytic cell, and short service life.

Method used

The surface treatment process of boric acid refractory bricks involves roughening the surface, coating it with a penetrating material to form a barrier layer, and then using materials such as iron powder, silicon dioxide, and europium oxide to form a dense resistive layer at high temperature, thereby enhancing the density and corrosion resistance of the refractory material.

Benefits of technology

It improves the density and corrosion resistance of refractory materials, extends the service life of aluminum electrolytic cells, reduces the risk of aluminum liquid penetration and electrolyte corrosion, and enhances the thermal efficiency and stability of electrolytic cells.

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Abstract

The application relates to the field of refractory materials, in particular to a surface treatment process for the bottom of an aluminum electrolysis cell, which solves the problem that composite metal objects are difficult to form a dense structure with non-metallic inorganic matters such as Si3N4 and SiC, and that more micropore gaps lead to the penetration of aluminum liquid and electrolyte into the refractory material and the damage of the refractory material, and the surface treatment process comprises the following steps: preparing a boric acid refractory brick, roughening the surface of a refractory bearing material, coating a permeable material on the outside of the refractory bearing material, the thickness of the permeable material being 1-10 mm, heat treatment at 1300-1420 DEG C for 5-12 h, removal of the excess permeable material to obtain a refractory material precursor, placing a barrier material on the surface of the refractory material precursor, forming a barrier layer through cold isostatic pressing, heat treatment, formation of a high-density impedance layer on the surface of the refractory material precursor, and completion of the surface treatment. The application can realize the combination of dense inorganic non-metal and metal, and improve the corrosion resistance of the refractory material.
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