| Attempts have been made to beneficiate phosphogypsum,
an industrial by-product waste by various methods, viz. (i)
washing with water only, (ii) washing with water in presence
of chemicals and (iii) washing with chemical under
steam pressure. Washing with chemical under steam pressure
yielded best result in the context of removal of impurities.
The CaS04, 2H10 content could be increased from
89.0% (as such phosphogypsum) to 98.5% (beneficiated
phosphogypsum). Plaster of Paris prepared from the
beneficiated gypsum and that from selenite gypsum are of
comparable properties. |
