Influence of the composition and structure of the glass-crystalline shell of cenospheres on helium permeability |
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| Authors: | E V Fomenko N N Anshits M V Pankova O A Mikhaylova L A Solovyov N N Shishkina A G Anshits |
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| Affiliation: | 1.Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences,Krasnoyarsk,Russia;2.Siberian Federal University,Krasnoyarsk,Russia |
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| Abstract: | We studied the interrelation between the composition, morphology, and helium permeability of the shell of narrow fractions
of nonmagnetic nonperforated cenospheres extracted from cenosphere concentrates of fly ash of the sialic type with the use
of technological stages of hydrodynamic, magnetic separation, sizing, and aerodynamic classification. For the interval of
variation of Al2O3 content from 20 to 38 wt %, the regression equation SiO2]/Al2O3] = 5.06 − 0.1Al2O3] is established, with the correlation coefficient equal to −0.98. It is found that, together with the growth in the concentration
of Al2O3 in the indicated interval, the content of the originally mullite phase increases from 1.3 to 42.4 wt %, and this is accompanied
by the growth of the helium permeability of the glass-crystalline shell of the cenospheres. |
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