Brick and method of making same
AssigneeGilbert Associates, Inc.
InventorRobert H. Smith
Life of this patent
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Abstract
A brick or similarly fired construction unit and method of making it comprising mixing at least about 50% inorganic, non-ferrous residue from municipal incinerators, by weight, with coal fly ash and a binder, such as sodium silicate, and firing the mixture at a temperature of about 1700 to about 1900 to 2000.degree. F. for about 1/2 hour. A preferred "optimum" composition for lower firing temperatures and less costly binders comprises about 50 to 60% incinerator residue, 0.5 to 10% of sodium silicate or other binder and the remainder fly ash fired at 1700.degree.-1750.degree. F., which produces compressive strength and water absorption properties superior to fly ash brick and equal to better than conventional clay brick, even though the firing temperature is about 300.degree. less.
Claims2
The method of making a brick or similar fired construction unit comprising mixing about 50 to 60% inorganic substantially non-ferrous residue from municipal incinerators, by weight, which is milled and passed through a 4 mesh screen and composed of non-ferrous metal, glass and other non-metals, with the remainder of coal fly ash together with a binder of about 1 to 4% by weight, of the mixture, shaping, and firing the mixture at a temperature of between about 1700.degree. and 1750.degree. F. for about 1/2 hour to provide greater compressive strength and less water absorption than ordinary fly ash brick or clay brick with less firing temperature.
Dependencies are inferred from the claim text.