Chemistry: fertilizers – Processes and products – Inorganic material
Patent
1993-08-27
1995-01-24
Lander, Ferris
Chemistry: fertilizers
Processes and products
Inorganic material
71 63, 71 6407, 71 6411, 71 6412, 71 6413, 23302A, C05C 300
Patent
active
053839510
ABSTRACT:
A process is disclosed for the production of free-flowing, non-caking, stable granular ammonium sulphate containing micronutrients comprising granulating ammonium sulphate in the presence of a granulating aid which is stripped zinc electrolyte derived from an electrolytic zinc operation. An effective amount of stripped zinc electrolyte is used to yield a final ammonium sulphate product containing about 0.4% to 1.3% by weight zinc, up to about 0.16% by weight magnesium and up to about 0.09% by weight manganese. The stripped zinc electrolyte, typically containing 20-25 g/L zinc, 2-4 g/L magnesium, 1-2 g/L manganese and sulphuric acid, may be added during reaction of ammonia and sulphuric acid prior to granulation. A free-flowing, non-caking, hard, ammonium sulphate granular fertilizer having a pH of about 2 to 7.5 as 10% solution, containing by weight 0.4% to 1.3% by weight zinc, up to about 0.16% by weight magnesium and up to about 0.09% by weight manganese is produced.
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Beynon Kenneth L.
Cross James B.
Hampton Cashman R. S. M.
Cominco Ltd.
Fors Arne I.
Lander Ferris
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