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US 4,230,652 AGranted
Method of repairing a refractory structure
AssigneeKaiser Aluminum & Chemical Corporation
InventorsJim E. Allen, Robert E. Farris
Life of this patent
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Abstract
Repair of furnace structures, particularly hot furnace structures, can be achieved by gunning with less dusting and rebound and higher cohesiveness, adherence, and strength in the gunned refractory when the refractory comprises an admixture of aluminosilica aggregate, plastic clay, graphite and, as binder, a liquid sodium silicate solution.
Claims4
The method of repairing a refractory structure comprising:
- (a) admixing (i) from 50 to 80% aluminosilicate aggregate, (ii) from 2 to 30% plastic clay, (iii) and from 10 to 20% graphite, the percentages being based on the total weight of the admixture;
- (b) predampening said admixture with from 5 to 10% by weight of liquid sodium silicate containing from 45% to 65% of water;
- (c) placing the predampened admixture in a gunning apparatus having an ejection nozzle adapted to admix water with a granular material passing through the nozzle;
- (d) projecting the predampened admixture through the nozzle, while adding water thereto, onto the refractory structure;
- characterized in that the predampened admixture is substantially dust-free during subsequent handling and exhibits a potential shelf-life of up to six months when stored in a moisture sealed container.
2 more elements
Dependencies are inferred from the claim text.