Process for manufacturing a lightweight aggregate
AssigneeGranulite Limited
InventorBryan J. Walker
Life of this patent
Estimating the term…
Abstract
Lightweight aggregate for use in the building industry is produced by pelletizing or granulating pulverized fuel ash or other siliceous material with a binder comprising lime in an amount less than 5% by weight based on the weight of the mixture of lime and siliceous material and curing the pellets or granules at a temperature within the range of from 35.degree. C. to 100.degree. C. in an atmosphere saturated with water vapor. The amount of lime added as binder is preferably within the range of from 1 to 4.5% by weight and curing temperature is preferably within the range of from 50.degree. to 85.degree. C. Preferably the pelletizing process is also carried out at an elevated temperature within the range of from 35.degree. C. to 100.degree. C.
Claims15
A process for manufacturing a lightweight aggregate for use in the building industry, which comprises:
- (a) blending fly ash and an effective amount less than 5%, calculated as CaO, of quick lime, hydrated lime or mixtures thereof based on the total dry weight of fly ash and lime to increase the crushing strength of a pellet or granule formed therefrom;
- (b) forming the blend into granules or pellets with an effective amount of water to allow pelletization;
- (c) curing or hardening the pellets or granules at a temperature maintained within a range of from 35.degree. to 100.degree. C. in an atmosphere saturated with water vapor for a time sufficient to dry the pellets or granules and to increase the crushing strength of the pellets or granules.
A process for manufacturing a lightweight aggregate for use in the building industry, which comprises:
- (a) blending siliceous material and an effective amount less than 5%, calculated as CaO, of quick lime, hydrated lime or mixtures thereof based on the total dry weight of siliceous material and lime to increase the crushing strength of a pellet or granule formed therefrom;
- (b) forming the blend into granules or pellets with an effective amount of water to allow pelletization;
- (c) curing or hardening the pellets or granules at a temperature maintained within a range of from 35.degree. to 100.degree. C. in an atmosphere saturated with water vapor for a time sufficient to dry the pellets or granules and to increase the crushing strength of the pellets or granules.
Dependencies are inferred from the claim text.