Granulating method and apparatus

Details Granulating method and apparatus Granulating method and apparatus

1974-01-31

1976-04-13

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

186109, C09C 102

Patent

active

039501817

ABSTRACT:
Porous gypsum granules are produced by adding powdered plaster to a stable aqueous foam and agitating the foam until granules of desired size are formed. Agitation is terminated before the foam collapses, but when the foam has subsequently collapsed the damp granules are recovered and dried. The product granules have a generally spheroidal shape mainly in the size range 0.25 to 2 mm, with a fine compact outer surface layer and a coarser interior with voids which confer high absorbency. These can be used as carriers for active materials such as herbicides or insecticides for agricultural or horticultural purposes or as fillers for plastics. Apparatus for continuously mixing fluid materials and suitable for use with foam and gypsum consists of a trough-shaped conveyor with a series of rotary agitators spaced along it.

REFERENCES:
patent: 2529835 (1950-11-01), Dailey et al.
patent: 2913346 (1959-11-01), Hoffman

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