Conversion of Phosphogypsum to Sulfur. Part 1--Oxidation of Calcium Sulfate to Calcium Sulfide.
Smelley AG; Ragin MM; Brooks DR; Scheiner BJ
Proc 3rd W s By-products Phosphate Ind Tampa Florida 12/5-7/85 Univ Miami Florida 1986 :53-65
This paper describes research into the conversion of phosphogypsum to sulfur, focusing on the reduction of phosphogypsum to calcium sulfide, which is later converted to ammonium bisulfide, and from there to sulfur. Baseline experiments determined that phosphogypsum could be reduced to calcium sulfide at 850 deg to 1,000 deg c using either coal or carbon monoxide as the reductant. The required temperature was lowered to 750 deg c using fe3o4 as a catalyst for the reduction reaction. The effects of temperature, catalyst, reaction time, and type of reductant (carbon monoxide and coal) are also discussed.
Proc 3rd W.s. By-products Phosphate Ind, Tampa, Florida, 12/5-7/85. Univ Miami, Florida, 1986, Pp 53-65