Many wet process phosphoric acid plants use filtration aids to improve gypsum slurry filtration and hence increase production rates and recovery. Filtration aids are based on the principle of producing larger and more homogeneous particles or gypsum crystals to allow for faster drainage. The size and shape of gypsum crystals directly impact filtration rates, which in turn, influence production rates.
OAN provides polymeric filtration aids specifically designed to coalesce small gypsum crystals into much larger particles creating significantly larger void spaces in the filter cake. The larger void spaces allow for faster liquid drainage time on phosphoric acid filters.