Granulating an aqueous dispersion of ammonium and potassium salts
AssigneeAdelaide & Wallaroo Fertilizers Ltd.
InventorsKarl H. Walter, John D. Johnston, Dennis Wetherley
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Abstract
The preparation of dry, stable granular material from water-soluble potassium and ammonium salts and a mixture thereof by subjecting a dispersion of crystals of the salt in an aqueous liquid to the action of a granulating device in the presence of calcium sulphate hemihydrate and a hydrophilic surface active agent to effect agglomeration of said crystals, and thereafter subjecting the agglomerated crystals to a drying operation.
Claims17
A process for the preparation of dry, stable granular material from a salt selected from the group consisting of water-soluble potassium and ammonium salts selected from the group consisting of potassium sulfate, potassium chloride, ammonium sulfate and mixtures thereof, said process comprising the steps of:
- (1) crushing the salt, dispersing said crushed salt in an aqueous liquid to produce a dispersion of salt crystals,
- (2) subjecting said dispersion of crystals of at least one said salt in an aqueous liquid to the action of a granulating device in the presence of 0.5 to 10% w/w of calcium sulfate hemihydrate and 0.1 to 5% w/w of a hydrophilic surface active agent to effect agglomeration of said crystals, and
- (3) drying the resultant agglomerated crystals to produce the dry, stable granular material, said percentages being with respect to said salt.
A process for the preparation of dry, stable granular material from a salt selected from the group consisting of water-soluble potassium and ammonium salts and a mixture thereof, said process comprising the steps of:
- granulating a dispersion of crystals of at least one said salt in an aqueous liquid in a granulating device in the presence of 0.5 to 10% w/w of calcium sulfate hemihydrate and 0.1 to 5% w/w of a hydrophilic surface active agent to effect agglomeration of said crystals, said percentages being with respect to said salt, said aqueous liquid being an aqueous solution of said water-soluble crystalline salt and thereafter
- drying the resultant agglomerated crystals to produce a dry, stable, granular material.
Dependencies are inferred from the claim text.