Abstract
The waste phosphogypsum produced by Paradeep Phosphate Limited (PPL) at Paradeep (Cuttack, Orissa, India) consists primarily of calcium sulfate with small amounts of phosphoric acid, calcium fluoride and other harmful components. Presently these are dumped as waste. In this work, laboratory trials have been made to utilize the calcium sulfate present in the phosphogypsum to prepare usable products like ammonium sulfate, calcium carbonate and magnesium sulfate.
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