Prilling by introduction of a molten liquid into a carrier liqui

Details Prilling by introduction of a molten liquid into a carrier liqui Prilling by introduction of a molten liquid into a carrier liqui

1998-08-24

2000-06-13

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By extrusion spraying or gravity fall through orifice

264 5, 264 9, B29B 910

Patent

active

060745819

ABSTRACT:
Prills are prepared by melting a salt and introducing the molten salt into carrier liquid. Oxidizing salts of ammonia, ammonium nitrate (AN) and ammonium dinitramide (ADN) are melted with a stabilizer and introduced by dry nitrogen pressure into an inert, perfluorinated carrier liquid of greater specific gravity than the molten salts. In a first embodiment, the carrier liquid is quiescent and below the salt solidification temperature so that prills solidify from drops of the salt rising through a column which substantially retains the liquid. In a second and continuous embodiment, the carrier liquid is initially above the solidification temperature, and the salt is injected into the moving liquid which passes with the molten salt in turbulent flow through a heated conduit, in which stationary vanes disperse the salt into droplets, and then through a cooled conduit for solidification of the salt into prills without agglomeration. In the both embodiments, the prills may be separated from the liquid by flotation and any liquid carried with the prills recycled. In the continuous embodiment, the main flow of carrier liquid is pumped through a preheater and then back to the molten salt injector.

REFERENCES:
patent: 3207818 (1965-09-01), Marshall
patent: 4783217 (1988-11-01), Robertson

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