THE COMPOSITION AND POTENTIAL USES OF PNOSPHOGYPSUM.

A comprehensive analysis has been made to find out the exact composition of phosphogypsum. Results indicate a high percentage of gypsum (94.75 _ 1.51) which can be utilized for different purposes after removal of fluoride and phosphorus. Phosphogypsum, a by-product of the phosphate industry,therefore can be used as a raw material for the production of ammonium sulphate, sulphuric acid, plaster and expansive cement. Its evidence of low levels of heavy and poisonous metals allows its use for these purposes. It can also be used in the manufacture of building materials on account of its reasonably high content of silica. The trace levels of alkali metals allow its use in the reclamation of saline soils