Dual injection of two polymeric filtration aids for gypsum removal from phosphoric acid/gypsum slurry
AssigneeArr-Maz Products, L.P.
InventorLouis Irwin
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Abstract
A process to improve the polymeric filtration aid performance used in removal of gypsum from phosphoric acid/gypsum slurry. A synergistic effect has been observed by using a Dual Injection method. This method more specifically involves using two polymers (A & B) of different chemistry and injecting into slurry at a different time. The polymer chemistry of filtration aid A is selected from the group consisting of non-ionic, anionic, and cationic polymers and the polymer chemistry of filtration aid B is selected from the group consisting of sulfonated polymers. The polymer (A & B) usage is reduced by around 50% and performance improved.
Claims5
A polymeric filtration aid method for gypsum removal from phosphoric acid/gypsum slurry, the method comprising:
- a dual injection process where two different polymers are separately injected into a phosphoric acid/gypsum slurry at a different time, followed by filtration of gypsum solids from a liquid phosphoric acid,
- wherein said phosphoric acid/gypsum slurry is produced from western phosphate ore obtained from mines in Idaho, and wherein the two different polymers are respectively comprised of different polymer chemistries of filtration aid A and B respectively, the polymer chemistry of filtration aid A being selected from the group consisting of non-ionic and anionic polymers produced from acrylamide and acrylic acid monomers, and the polymer chemistry of filtration aid B being selected from the group consisting of sulfonated polymers, wherein the sulfonated polymers comprise acrylamide tertialy-butyl (ATBS) and acrylamide or acrylic acid copolymers.
Dependencies are inferred from the claim text.