Particulate ammonium nitrate with added ferric phosphate and calcium sulfate
AssigneeChevron Research Company
InventorClive Hodgson
Life of this patent
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Abstract
Improved-strength particulate ammonium nitrate containing minor amounts of ferric phosphate is produced by forming the ferric phosphate in situ in aqueous or molten ammonium nitrate from a ferric salt and phosphoric acid. Further improvement in strength is obtained by additionally incorporating minor amounts of calcium sulfate.
Claims12
A composition of matter comprising solid particulate ammonium nitrate prepared in situ by mixing with aqueous or molten ammonium nitrate sufficient soluble ferric salt and phosphoric acid in substantially stoichiometric amounts adapted to form ferric phosphate in an amount from 0.3 to 2 weight percent, based on weight of ammonium nitrate, and subsequently prilling or granulating the ammonium nitrate.
A composition of matter comprising solid particulate ammonium nitrate containing a mixture of 0.1 to 2.5 weight percent, based on weight of ammonium nitrate, of ferric phosphate and 0.1 to 2.5 weight percent, based on weight of ammonium nitrate, of calcium sulfate, in a mol ratio of ferric phosphate to calcium sulfate of 5:1 to 1:5, said composition being prepared in situ by mixing aqueous or molten ammonium nitrate with (1) a soluble ferric salt, ammonium sulfate and phosphoric acid in substantially stoichiometric amounts or (2) ferric sulfate and phosphoric acid in substantially stoichiometric amounts, and subsequently adding calcium carbonate to the resulting composition.
Dependencies are inferred from the claim text.