Abstract
Between January 5, 1989, and November 15, 1989, Freeport-McMoran, Inc (FMI)in cooperation with the Davy McKee Corporation operated an experimental pilot plant for the recovery of sulfur dioxide (SO2) and slag aggregate from the thermal decomposition of phosphogypsum and other materials. The pertinent results collected from FMI's testing program on the slag aggregate are summarized. The research program included physical and chemical characterization; mineralogical, leachage, and radiological analysis; and durability tests. The resultsindicate that the slag aggregate may find uses in road base/subbaseconstruction, hot mix asphalt paving mixtures, and portland cement concrete mixtures