Phosphogypsum is a byproduct of the phosphate
fertilizer industry and emanates from the production of
phosphoric acid from rock phosphate. Production of
phosphogypsum in Florida is estimated to be 27.2
million Mg annually (Hunter 1989). The composition
of phosphogypsum varies depending upon the source
of rock phosphate and the process for manufacturing
phosphoric acid (Mays and Mortvedt 1986). The
approximate composition of phosphogypsum is shown
in table 29.