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US 4,057,605 AGranted
Manufacture of light granular materials
AssigneeCharbonnages de France
InventorRaymond Chauvin
Life of this patent
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Abstract
Light granular material is manufactured from silico-aluminous material by crushing and/or screening the silico-aluminous material to a fine powder which is mixed with water to form a slip which is divided into drops which are immediately introduced into a hot fluidised bed. The water evaporates rapidly and the drops are converted into expanded granules which are recovered and subjected to ceramic firing.
Claims11
A method of manufacturing porous granular material useful as lightweight aggregate for concrete, and obtained from silico-aluminous material, comprising:
- a. crushing the silico-aluminous material to a powder having a particle size of less than about 200 microns,
- b. mixing said powder with water to form a slip which can be divided into droplets, said slip containing 25-40% by weight of water,
- c. forming said slip into droplets which fall into a fluidized bed of solid particles, said bed being maintained at a temperature of 200.degree.-500.degree. C,
- d. evaporating the water from said droplets in said bed to convert said droplets to expanded granules,
- e. recovering said expanded granules, and
- f. subjecting said expanded granules to ceramic firing.
3 more elements
Dependencies are inferred from the claim text.