1. 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.
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