Abstract:
Tripoli from two Ukrainian deposits was studied in its natural and modified forms.
The investigation of natural and modified tripoli involves the identification of their phase
compositions through X-ray diffraction and the analysis of their water vapor adsorption-desorption
isotherms. The obtained results are evidence of changes in the structural-adsorption parameters of
tripoli as a result of modification. Their treatment in boiling water or acid causes apparent alterations
of contents of the main phases and sizes of their crystallites, whereas their calcination causes not only
the dehydroxylation of surfaces and the agglomeration of phases, but even phase transformation in
the case of carbonate tripoli. After analyzing water vapor adsorption-desorption isotherms of natural
and modified tripolis, some correlations between their adsorption parameters, phase compositions,
main phase contents and crystallite sizes have been found.
