Method of providing a protective coating composition for molten aluminum and alkali metal environments
AssigneeMagneco/Metrel, Inc.
InventorsMadjid Soofi, Lara Binz, Michael W. Anderson
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Abstract
The invention is directed to a method of providing a protective coating composition that protects a refractory wall or lining from chemical attack by molten aluminum and molten alkali metals. The method includes the steps of coating a refractory wall or liner with an aqueous protective composition that includes, by weight of the solids, about 20-90% Al2O3 (excluding calcined alumina), about 15-55% SiO2 and about 1-15% of a metallic non-wetting agent; and evaporating the water before contacting the protective coating with the reactive molten metal.
Claims16
A method of providing a protective coating composition comprising about 5% by weight to about 40% by weight water and about 60% to about 95% solids, comprising the steps of:
- providing an aqueous colloidal silica suspension that includes about 30-60% by weight colloidal silica particles and about 40-70% by weight water based on the weight of the aqueous colloidal silica suspension;
- providing solid ingredients including quantities of Al2O3, SiO2, a metallic non-wetting agent and a water-soluble thickening agent;
- and
- causing the solid ingredients to be mixed with the aqueous colloidal silica suspension to provide the protective coating composition;
- wherein the metallic non-wetting agent constitutes 3% to 13% by weight of the solids in the protective coating composition and
- at least some of the Al2O3 and SiO2 are provided as micronized mullite having a median particle size of 2 to 10 microns and constituting about 30% to about 70% by weight of the solids.
Dependencies are inferred from the claim text.