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Utilization of Phosphogypsum for the Production of Sulfuric Acid.
Wheelock-TD; Fan-CW; Floy-KR
Proc 2nd Int'l Symp on Phosphogypsum 1988 2:3-24
A method for producing sulfur dioxide and quicklime from phosphogypsum and another calcium-containing waste was demonstrated with bench-scale and pilot-plant-scale fluidized-bed reactors. The sulfur dioxide produced by this method is suitable for conversion into sulfuric acid by conventional methods, and the byproduct quicklime shows promise for a number of applications. Similar results were achieved with two different versions of the process. In one version a solid reductant (coal) was employed, whereas in another version gaseous reductants derived from coal or natural gas were utilized. A bench-scale reactor was used to demonstrate basic concepts and to study important operating conditions, and a pilot plant reactor was used to confirm results achieved with the smaller unit. The pilot plant was operated with feed rates up to 70 lb/h and for periods ranging up to 30 h; few problems were encountered. The results provided a basis for a preliminary design study for a large-scale reaction and heat recovery system, which showed that a product gas stream containing 11 to 12 pct sulfur dioxide can be produced in a practical system.
OP; Final Contract Report;
Proc. 2nd Int'l Symp. on Phosphogypsum, V. 2, Florida Inst. Phosphate Res., 1988, PP. 3-24
Iowa State University
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