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  • 1 Institute for Geology of Ore Deposits (IGEM) Acad. Sci. of USSR Moscow U.S.S.R
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Perlites from large-scale deposits in the USSR were investigated by a modified DTG method. The technique permits an essentially higher DTG curve resolution in comparison with that of conventional DTG curves obtained with a derivatograph. The investigated perlites are classified into two groups: dense and porous. Elimination of water from perlites occurs in from 3 to 5 stages. The content of water lost at low temperature is higher in the dense perlites than in the porous ones.

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