Aluminum electrolytic cell method with application of refractory

Chemistry: electrical and wave energy – Processes and products

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205230, C25C 306, C25D 366

Patent

active

053404483

ABSTRACT:
An adherent protective coating of a refractory material is produced on the surface of carbonaceous, refractory, ceramic, metallic or other materials serving as components of electrolytic cells operating at high temperature, by applying to such surfaces a well chosen micropyretic reaction layer from a slurry, which when dried is ignited to initiate a self-sustaining micropyretic reaction, along a combustion front, to produce condensed matter forming such refractory protective adherent coating. The slurry is preferably applied in several layers, the first layer(s) to facilitate adherence and the last layer(s) to provide protection and may contain some preformed non-reactant materials. The electrolytic cells whose components require such coatings are especially those operating at high temperature with a molten salt electrolyte, particularly those for the production of metals, aluminum being the most important. For these cells the invention provides an aluminum-wettable, adherent, refractory, protective coating for the cell-bottom carbon cathode, containing RHM material such as titanium diboride, as well as other refractory protective coatings for cell wall lining and for other cell components. Novel cell designs for the utilization of the different coatings are also provided.

REFERENCES:
patent: 4614569 (1986-09-01), Duruz et al.
patent: 5158655 (1992-10-01), Townsend
patent: 5217583 (1993-06-01), Sekhar et al.
patent: 5279715 (1994-06-01), LaCamera et al.

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