Siberian Federal University, Krasnoyarsk, Russia:

S. G. Shakhray, Assistant Professor, e-mail: shahrai56@mail.ru

JSC “RUSAL Krasnoyarsk”, Krasnoyarsk, Russia:

A. V. Belyanin, Ecology and Quality Executive Officer

Irkutsk National Research Technical University, Irkutsk, Russia:

V. V. Kondratev, Assistant Professor

LLC “RUSAL Engineering-Technical Center”, Krasnoyarsk, Russia:

I. I. Lapaev, Manager

layer in electrolytic cell with self-baking anode and upper current lead. There was offered a technical solution, aimed at reduction of gas-containing layer thickness between carbon anode and electrolyte melt, where ohmic voltage loss reach 400 mV voltage, and power consumption for its resistance overcoming reaches 1400 kW·h/t of Al and more. Reduction of gas-containing layer thickness significantly reduces the ohmic voltage loss by 1,5–2,0 times. Thus, the electrolytic cell consumption of electricity is reduced by 700–1000 kW·h/t of Al in average, which is equivalent to increase of current efficiency by 2–3%. According to this, energetic environmental indicators are improved, which corresponds to the state politics in Russia and world leading countries in the area of energy- and resource-saving. Implementation of offered technical solution provides the energy performance of a cell with self-baking anode and upper current supply at the level, close to the energy performance level of prebaked anode, which is currently the most energy efficient. Reduction of gas-containing layer thickness ensures the removal of gases, produced during the coking process and oxidation of anode through the pipe and baked anode body, and connected to the venting system. The pipes, placed in the middle part, are perforated, where the pipes, placed at the bottom, are equipped with high porous gas transmission plug, which can be manufactured by sintering of under-stud anode mass with high binder content. Perforation in the middle part provides the removal of anode coking gases from their formation areas into gases removement system, passing the “traditional” way — through anode body under the plenum anode electrolytic cell, which contributes to more compact structure of sintered anode. Due to the lower part of the pipe, a porous plug prevents the melt from freezing and clogging pipes. Reduction of amount of gas, passing under the base of anode, reduces the intensity of local formation of waves on the surface of metal and the size of gas bubbles, entering the plenum cell.

1. Available at: http://www.rg.ru/2009/11/27/energo-dok.html.
2. Begunov A. I., Begunov A. A. Resheniya po radikalnoy modernizatsii elektroliznykh proizvodstv s anodami Zoderberga rossiyskoy alyuminievoy promyshlennosti (Decisions on radical modernization of electrolysis productions with Soderberg anodes of Russian aluminium industry). II Mezhdunarodnyy kongress “Tsvetnye metally — 2010” : sbornik dokladov (II International congress “Non-ferrous metals — 2010” : collection of reports). Krasnoyarsk, 2010. pp. 581–588.
3. Begunov A. I., Begunov A. A. Puti radikalnogo snizheniya raskhoda energii na alyuminievykh elektrolizerakh s verkhnim tokopodvodom (Ways of radical decreasing of energy consumption on aluminium electrolytic cells with upper current lead). XI Mezhdunarodnaya konferentsiya “Alyuminiy Sibiri — 2005” : sbornik dokladov (XI International conference “Siberian aluminium — 2005” : collection of reports). Krasnoyarsk, 2005. pp. 79–82.
4. Galevskiy G. V., Kulagin N. M., Mintsis M. Ya., Sirazutdinov G. A. Metallurgiya alyuminiya. Tekhnologiya, elektrosnabzhenie, avtomatizatsiya (Metallurgy of aluminium. Technology, power supply, automation). Third edition, revised and enlarged. Moscow : Flinta, Nauka, 2008. 528 p.
5. Yanko E. A. Proizvodstvo alyuminiya : uchebnoe posobie dlya masterov i rabochikh tsekhov elektroliza alyuminievykh zavodov (Production of aluminium : tutorial for masters and workers of electrolysis shops of aluminium plants). Saint Petersburg : Publishing House of Saint Petersburg University, 2007. 305 p.
6. Shakhray S. G., Korostovenko V. V., Rebrik I. I. Sovershenstvovanie sistem kolokolnogo gazootsosa na moshchnykh elektrolizerakh Soderberga : monografiya (Improvement of bell fume exhaust systems at powerful Soderberg electrolytic cells : monograph). Krasnoyarsk, 2010. 146 p.
7. Begunov A. I. Elektrolizer dlya polucheniya alyuminiya (Electrolytic cell for aluminium obtaining). Patent RF, No. RU 218758.
8. Ryaguzov V. N. Sposob vyvedeniya gazov iz-pod podoshvy samoobzhigayushchegosya anoda alyuminievogo elektrolizera (Method of removal of gases from self-baking anode face of aluminium electrolytic cell). Certificate of Authority USSR, No. 313897.
9. Saakyan P. S., Agababyan M. M. Ustroystvo dlya nepreryvnoy i polunepreryvnoy podachi glinozema v elektrolit (Unit for continuous and semi-continuous supplement of alumina in electrolyte). Certificate of authority USSR, No. 124627.