Granulation of crystalline by-product ammonium sulfate

Details Granulation of crystalline by-product ammonium sulfate Granulation of crystalline by-product ammonium sulfate

1985-08-26

1986-05-20

Lander, Ferris H.

Chemistry: fertilizers

Processes and products

Inorganic material

71 63, 71 6405, 71 6413, 423162, C05D 900

Patent

active

045899045

ABSTRACT:
A process for granulating crystalline by-product ammonium sulfate, hereinafter referred to, for the sake of convenience, as A/S, to produce a product having excellent physical and chemical properties as they relate to the storage and handling thereof and also as they relate to the bulk blending of same with other fertilizer blend materials. The method involves introducing the crystalline by-product A/S feedstock, together with recycle material, into a conventional drum ammoniator granulator and granulating the mixture using A/S-sulfuric acid-alum solution and gaseous anhydrous ammonia to bind the crystals together by virtue of the fresh A/S produced and precipitated. Drying in a rotary drum dryer by countercurrent flow of hot gases instead of the more conventional cocurrent gas flow is required.

REFERENCES:
patent: 4252553 (1981-02-01), Pircon et al.
patent: 4252776 (1981-02-01), Huckabay et al.
patent: 4328189 (1982-05-01), Haese et al.
patent: 4337228 (1982-06-01), Garrett, Jr.

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