US 12,351,456 B2
Method to make phosphoric acid and ammonium phosphates from phosphate minerals
Phillip Warren Barak, Madison, WI (US)
Assigned to Wisconsin Alumni Research Foundation, Madison, WI (US)
Filed by Wisconsin Alumni Research Foundation, Madison, WI (US)
Filed on Jun. 4, 2021, as Appl. No. 17/338,825.
Application 17/338,825 is a continuation of application No. 16/778,474, filed on Jan. 31, 2020, granted, now 11,027,975.
Claims priority of provisional application 62/799,372, filed on Jan. 31, 2019.
Prior Publication US 2021/0292169 A1, Sep. 23, 2021
Int. Cl. B01J 39/02 (2006.01); B01J 39/12 (2006.01); B01J 39/16 (2017.01); C01B 25/18 (2006.01); C01B 25/28 (2006.01); C01B 25/32 (2006.01); C05B 11/00 (2006.01); C05B 7/00 (2006.01)
CPC C01B 25/185 (2013.01) [B01J 39/02 (2013.01); B01J 39/12 (2013.01); B01J 39/16 (2013.01); C01B 25/28 (2013.01); C01B 25/321 (2013.01); C05B 11/00 (2013.01); C05B 7/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of producing ammonium phosphates comprising:
contacting at least one mineral with a cation exchanger for a time and at a temperature sufficient to yield an ammonium phosphate 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, and wherein the mineral is brushite.