Influence of the Composition and Structure
of the Glass-Crystalline Shell of Cenospheres
on Helium Permeability

E. V. Fomenko^a, N. N. Anshits^a,b, M. V. Pankova^a,b, O. A. Mikhaylova^a, L. A. Solovyov^a,
N. N. Shishkina^a, and A. G. Anshits^a,b

^aInstitute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences,
ul. K. Marksa 42, Krasnoyarsk, 660049 Russia

^bSiberian Federal University, pr. Svobodhyi 79, Krasnoyarsk, 660041 Russia

e-mail: fom@icct.ru

Received March 5, 2011

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 – 0.1[Al₂O₃] 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.

DOI: 10.1134/S1087659612020046

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