Deagglomerating direct-fired flash dryer for drying stir-in phos

Details Deagglomerating direct-fired flash dryer for drying stir-in phos Deagglomerating direct-fired flash dryer for drying stir-in phos

1990-01-22

1991-04-16

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With apparatus using centrifugal force

34 60, 34102, F26B 1700

Patent

active

050071815

ABSTRACT:
A method for making stir-in type halophosphate phosphors to obtain a fluffy, deagglomerated powder is disclosed. A wet phosphor filter cake is fed into a toroidal-shaped direct-fired glass flash dryer in which a hot gaseous stream is circulating. The wet phosphor particles are suspended in the stream while the remaining liquid is evaporated. The dried phosphor powder is ejected from the dryer by centrifugal force and collected. Recovery efficiency of the process is about 99.9 percent.

REFERENCES:
patent: B345390 (1975-01-01), Demarest et al.
patent: 4407720 (1983-10-01), Bratten
patent: 4430231 (1984-02-01), Bratten
patent: 4481108 (1984-11-01), Bratten

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