Plastic refractory composition suitable for placement by vibrating and the use thereof
AssigneeChicago Fire Brick Company
InventorsHarold L. Rechter, James R. Haligarda
Life of this patent
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Abstract
High alumina, phosphate containing refractory plastic composition suitable for placement by mechanical vibration using molding techniques are maximized in density and shelf life while requiring minimum water content for ease of placement through the combining of a relatively low content of bentonite with a small addition of tetrasodium pyrophosphate. The resulting compositions are easy to place by vibration with minimal tendency to slump on removal of forms.
Claims9
A plastic refractory composition suitable for placement by mechanical vibration comprising in percent by weight on a dry basis:
- ______________________________________ % ______________________________________ 325 mesh alumina or aluminum silicate 20-45 Phosphoric acid or water soluble phosphate to give a P.sub.2 O.sub.5 content equal to 75% phos- phoric acid 3-12 Bentonite 1.2-3 Kaolin clay 0-1 Tetrasodium pyrophosphate 0.2-1.5 Alumina or aluminum silicate aggregates, 1/4 inch maximum size balance. ______________________________________
In a method of vibration placement of a composition comprising 50-95 percent alumina content refractory and a phosphate bonding agent, the improvement wherein the composition that is vibrated includes 1.2-3 percent bentonite and at least 0.2 percent tetrasodium pyrophosphate.
The method of vibration placement of a refractory composition for furnaces, ladles and the like which comprises placing in the desired place and vibrating a composition comprising in percent by weight on a dry basis:
- ______________________________________ % ______________________________________ 325 mesh alumina or aluminum silicate 20-45 Phosphoric acid or water soluble phosphate to give a P.sub.2 O.sub.5 content equal to 75% phos- phoric acid 3-12 Bentonite 1.2-3 Kaolin clay 0-1 Tetrasodium pyrophosphate 0.2-1.5 Alumina or aluminum silicate aggregate, 1/4inch maximum size balance. ______________________________________
Dependencies are inferred from the claim text.