Fluoride Emissions from Phosphoric Acid Plant Gypsum Ponds.

摘要

The report gives results of a study of fluoride emissions from ponds receiving process water from wet-process phosphoric acid plants. Volatile fluorine compounds accumulate in water used in the manufacture of phosphoric acid by the wet-process method. This process water is routed to ponds for cooling and eventual re-use. While in the ponds,some of the fluorine compounds evaporate,becoming air pollutants. Emission estimates were developed from the pond-to-air mass transfer coefficient and the vapor pressure of fluorine over pond water. These estimates were tested by measurements of ambient-air,fluorine-compound concentrations downwind of the ponds. Comparing the measured ambient air concentrations with concentrations predicted from the emission estimates and a standard atmospheric pollutant dispersion model demonstrated the validity of the emission estimates.