1010
LOKSHIN, LEBEDEV
and nitrite.
returning into circulation not decomposed portion of the
concentrate.
ACKNOWLEDGMENTS
Improving the efficiency of decomposition of BC
in its grinding is controlled not only by increasing the
surface interaction, reducing the diffusion path, but also
by a decrease in the bulk density, and, as a consequence,
by a growth in an amount of liquid sodium nitrate in the
pores of loaded BC.
This work was supported by the Program for Basic
Research of Russian Academy of Sciences “Creation of
new products from mineral and organic materials.”
REFERENCES
As the enlargement of the process facilitates a decrease
in the share of distilled NaNO3 the optimal ratio of com-
ponents in the original mixture should be determined by
a size and geometry of crucibles used.
1. Kolenkova, M.A., Shumenko, V.I., Dorokhina, M.N., and
Safuanova, N.A., Novoe otechestvennoe tsirkonievoe syr’e
i sposoby ego pererabotki (New Domestic Zirconium Ma-
terials and Methods of Its Processing), M: TsNIItsvetmet,
ekonomiki, i, informatsii, 1980. 47, s.
CONCLUSIONS
2. Zakharov, V.I., Eremin, N.I., Bondin, S.M., et al., Khimiya
i khimicheskaya tekhnologiya mineral’nogo syr’ya (Chem-
istry and Chemical Technology of Mineral Raw Materials),
Apatity: Izd. KFAN SSSR, 1977.
(1) It was shown that the interaction of baddeleyite
with sodium nitrate occurs at temperatures above 640°C
directly without preliminary decomposition of sodium
nitrate to sodium nitrite or oxide. In heating in the air
sodium nitrite before the interaction with baddeleyite
is transformed into sodium nitrate. A growth in interac-
tion temperature increases both the rate of the reaction
between reagents and degree of sublimation of sodium
nitrate. The optimal temperature range of the interaction
is 800–900°C and time is 3 hours.
3. Zakharov, V.I., Matveev, V.A., Matveenko, S.I., and
Men’shikova, N.A., Kinetika i mekhanizm geterogennykh
reaktsii (Kinetics and Mechanism of Heterogeneous Reac-
tions), Leningrad: Nauka, 1979.
4. Zakharov, V.I., Doctoral Sci. (Chem.) Dissertation, St. Pe-
tersburg, 1991.
5. Dukhanin, G.P. and Lopatin, S.I., Zh. Prikl. Khim., 2011,
vol. 84, no. 2, pp. 188–193.
(2) Strontium zirconate formed on the surface of
baddeleyite grains is, as a rule, X-ray amorphous and
hampers the diffusion penetration of the molten sodium
nitrate to the baddeleyite grains.
6. Protsenko, P.I. and Bordyushkova, E.A., Zh. Neorg. Khim.,
1965, vol. 10, no. 5, pp. 1215–1219.
7. Lokshin, E.P., Lebedev, V.N., Lyakhov, V.P., et al.,
Ogneupory, Tekhn. Keramika, 2002, no. 11, pp. 34–40.
(3) Due to hydrolytic decomposition of X-ray amor-
phous strontium zirconate over 70% of bound sodium
in the form of hydroxide goes into the solution and can
be used for the absorption of nitrogen oxides released
during the interaction of baddeleyite with sodium nitrate
8. Lebedev, V.N., Lokshin, E.P., and Mel’nik, N.A., Zh. Prikl.
Khim., 2003, vol. 76, no. 2, pp. 190–195.
9. Lokshin, E.P., Lebedev, V.N., and Kalinnikov, V.T., Resursy,
Tekhnologiya, Ekonomika, 2004, no. 2, pp. 14–21.
RUSSIAN JOURNAL OF APPLIED CHEMISTRY Vol. 85 No. 7 2012