Abstract
The influence of mechanoactivation on the overall solubility of CaSO 4 · 2H 2O and of phosphogypsum in water and in diluted acids (10% HCl, 7% H 2SO 4) as well as on the leaching of rare earths from phosphogypsum have been studied. The mechanoactivation is performed in a centrifugal ball mill in air and in suspension with the acids mentioned above. Part of the experimental results are qualitatively explained considering the partial dehydration of the CaSO 4 · 2H 2O during the activation in air as well as considering the crystal structure disrupted by mechanoactivation. A dissolved fraction, considerably enriched in rare earths (compared to the initial phosphogypsum) is obtained as a result of H 2SO 4 treatment of the samples activated in water solution.
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