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ArticleName The influence of mechanical activation on the dust index and the dissolution rate of alumina in the molten cryolite
DOI 10.17580/tsm.2018.08.08
ArticleAuthor Yushkova O. V., Isaeva L. A., Polyakov P. V., Avvakumov E. G.

Siberian Federal University, Krasnoyarsk, Russia:
O. V. Yushkova, Leading Engineer, e-mail:
L. A. Isaeva, Associate Professor
P. V. Polyakov, Consultant Professor


Institute of solid state chemistry and mechanochemistry of the Siberian branch of the Russian academy of sciences (ISSC SB RAS):
E. G. Avvakumov, Principal Researcher


The influence of mechanical activation (MA) regime and the composition of alumina on the physico-chemical properties (dust index, granulometric and chemical composition (fluorine and iron content), dissolution rate in the molten cryolite, specific surface) have been studied. The alumina of grade G-00K supplied by various maufacturers was used before and after dry gas cleaning (fluorinated). The laser and visual methods, potentiometric titration method, X-ray phase analysis, the photocolorimetric method and the standard method for determining the dust index were used to determine the properties of alumina. It is shown that the MA of alumina of the Achinsk Combine (AC) in a centrifugal flow disk mill leads to a 2.3-fold decrease in the dust index and an increase in the dissolution rate by a factor of 2. With MA of alumina of the Nikolaev Alumina Combine (NAC) in the planetary mill of periodic action M-3, the dusting index decreases practically to zero. Mechanoactivation reduces the loss of raw materials from dusting. It is established that MA irrespective of the regime increases the reactivity of alumina and leads to the aggregation of particles. An increase in the rate of dissolution of alumina in cryolite will eliminate the formation of sediment, increase the productivity of electrolysis baths and increase the life of electrolyzers. Alumina after dry gas scrubbing is enriched with fluoride compounds, and MA increases the reactivity of the material.

keywords Alumina, mechanical activation, dust index, centrifugal disk mill, dissolution rate, aggregation

1. Welch B. T. Constraints and options for reducing energy consumption in of smelting. TMS. 2008. 501 p.
2. Gadd M. P., Welch B. T., Ackland A. P. The effect of processoberations on smelter cell for heat losus. TMS. 2000. pp. 231–237.
3. Lindsаy S. Anode Cover. TMS 2014. Industrial Aluminum Electrolysis: The Definitive Course on Theory and Practice of Primary Aluminum Production. November 16–20, 2014. Dubai, UAE. 2014. available at :
4. Zhang Q., Taylor M. P., Chen J. J. J., Cotton D., Grontzu T., Yang X. Composition and thermal analysis of crust formed from industrial anode cover. Light metals. 2013. P. 679.
5. Mintsis M. Ya., Polyakov P. V., Sirazutdinov G. A. Electrometallurgy of aluminum. Novosibirsk : Nauka, 2001. 368 p.
6. Yushkova O. V., Kulebakin V. G. Mechanical activation as a way to increase the reactivity of alumina and dust suppression. Journal of Siberian Federal University. Engineering & Technologies. 2011. Vol. 4, No. 6. pp. 595–600.
7. Isaeva L. A., Polyakov P. V. Alumina in the production of aluminum by electrolysis. VIII Higher Russian aluminum courses. Krasnoyarsk : Izdatelstvo GUTsMiZ, 2005. pp. 1–13.
8. Hsien H. P. Measurement of flowability and dustiness of alumina. Light metals. 1986. pp. 139–149.
9. Molchanov V. I., Yusupov T. S. Physical and chemical properties of currentdispersed materials. Moscow : Nedra, 1981. 157 p.
10. Yushkova O. V., Kulebakin V. G., Polyakov P. V., Isaeva L. A., Yushkov V. V. The method of mechanical processing, excluding the dusting of powders. Nonferrous metals – 2012 : a collection of scientific articles. Krasnoyarsk : Verso, 2012. pp. 503–508.
11. Avvakumov E. G., Kalinkin A. M., Kalinkina E. V. Experience of using a continuous centrifugal mill for mechanical activation of titanite. Khimicheskaya tekhnologiya. 2008. Vol. 9, No. 11. pp. 590–594.
12. Golosov S. I., Molchanov V. I. Centrifugal planetary mill, its technical capabilities and application in the practice of geological research. Physicochemical changes in minerals in the process of ultrafine grinding: a collection of scientific papers of Institute of Geology and Geophysics, Siberian Branch of the USSR Academy of Sciences (IGG). Novosibirsk, 1966. pp. 5–25.
13. Kryukovsky V., Frolov A., Tkatcheva O., Redkin A., Zaikov Yu., Khokhlov V., Apisarov A. Electrical conductivity of low melting cryolite melts. Light metals. 2006. Vol. 2. pp. 409–413.
14. Pismak V. N. Physicochemical basis for the production of active aluminum oxide, low-melting electrolyte and active anode mass for low-temperature aluminum production : Dissertation of Candidate of Technical Sciences. Ekaterinburg : UrFU named after the first president of Russia B. N. Eltsin, 2011. 104 p.
15. Poluboyarov V. A., Andryushkova O. V., Boldyrev V. V. Experimental observation of the sequence of processes occurring during the mechanical treatment of oxides. Fiziko-tekhnicheskie problemy razrabotki poleznykh iskopaemykh. 1993. No. 1. pp. 98–107.
16. GOST 27802–93 (ISO 902–76). Alumina. Method for the determination of repose angle. Introduced: 01–01–1995.

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