Refractory gunning composition
AssigneeBethlehem Steel Corporation
InventorsBernard A. Indelicato, William C. Books, Joseph E. Snyder
Life of this patent
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Abstract
A dry-nozzle gunning refractory composition consisting essentially of magnesia grains from crushed used refractory bricks, sodium bentonite clay, and a binder consisting essentially of a mixture of anhydrous sodium silicate particles and hydrated sodium silicate particles.
Claims8
A refractory gunning composition consisting essentially of magnesia refractory grains, about 1 to 8% by weight of the total composition of a plasticizer clay and about 2 to 14% by weight of the total composition of a binder consisting essentially of a mixture of particles of anhydrous sodium silicate and hydrated sodium silicate, said composition having a maximum of 5% of its particles larger than 10 mesh Tyler and between 10 to 15% of its particles smaller than 200 mesh Tyler, said composition characterized by an increasing viscosity when sprayed as a wet spray on a refractory wall, said composition after being mixed with water and dried having a Modulus of Rupture of at least 190 psi at 2200.degree. F. and at least 950 psi at 70.degree. F.
The method of making refractory repairs which comprises:
- (a) providing a gunning composition consisting essentially of magnesia grains, sodium bentonite clay between 1% and 8% by weight of the total composition, a binder between 2% and 14% by weight of the total composition, said binder consisting essentially of a mixture of particles of anhydrous sodium silicate and hydrated sodium silicate, said composition having a maximum of 5% of its particles larger than 10 mesh Tyler and between 10 to 15% of its particles smaller than 200 mesh Tyler;
- (b) discharging said composition through a nozzle of a spray gun;
- (c) mixing water with said composition at the nozzle to form a wet spray mix having a water content of between 8% and 19% by weight of the spray mix, and an increasing viscosity;
- and
- (d) depositing said wet spray mix onto a refractory base and drying said deposited wet spray mix to form a composition having a Modulus of Rupture of at least 190 psi at 2200.degree. F. and at least 950 psi at 70.degree. F.
Dependencies are inferred from the claim text.