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Mechanical activation has a noticeable effect on the properties of phosphogypsum (PG) and the efficiency of extracting rare earth elements (REE) from it. Samples of phosphogypsum retain their crystallinity in the wet mode of bead-type activators. The increased leaching of REE from activated phosphogypsum is due to a rise in different structural disturbances of its crystal lattice, the total effect of which is microdistortions caused by stresses of the first and third kind. Studies of the kinetics of leaching lanthanides from activated samples show that the rate of the process is limited by their internal diffusion. The calculated amount of energy absorbed by the FG sample after mechanical activation is 6.61 kJ/mol.
Kirillov et al. (Mon,) studied this question.