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US 11,027,975 B2Granted
Method to make phosphoric acid and ammonium phosphates from phosphate minerals
AssigneeWisconsin Alumni Research Foundation
InventorPhillip Warren Barak
Life of this patent
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Abstract
A method of producing phosphoric acid from at least one mineral containing phosphate and an element which is calcium, magnesium, iron, or aluminum. The method includes contacting the at least one mineral (or a combination of them) with a cation exchanger for a time and at a temperature sufficient to yield phosphoric acid from the mineral.
Claims20
A method of producing phosphoric acid comprising:
- contacting at least one mineral with a cation exchanger for a time and at a temperature sufficient to yield phosphoric acid from the mineral, wherein the mineral comprises phosphate and at least one element selected from the group consisting of calcium, magnesium, iron, and aluminum, and wherein the mineral requires from 30 to 1000 mass parts of water of pH 7.0 to one mass part of the mineral to dissolve the mineral and has increased solubility in acidic water having a pH range from about 2.0 to less than 7.0.
A method of producing phosphoric acid comprising:
- (a) isolating from a water stream at least one mineral, wherein the mineral comprises phosphate and at least one element selected from the group consisting of calcium, magnesium, iron, and aluminum, and wherein the mineral requires from 30 to 1000 mass parts of water of pH 7.0 to one mass part of the mineral to dissolve the mineral and has increased solubility in acidic water having a pH range from about 2.0 to less than 7.0;
- and
- (b) contacting the at least one mineral with a cation exchanger for a time and at a temperature sufficient to yield phosphoric acid from the mineral.
Dependencies are inferred from the claim text.