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Shakhrai S.G.,Siberian Federal University | Kondrat'Ev V.V.,National Research Irkutsk State Technical University | Belyanin A.V.,RUSAL Krasnoyarsk Company | Korostovenko V.V.,Siberian Federal University | Gron' V.A.,Siberian Federal University
Metallurgist | Year: 2014

Heat loss through the gas-collecting bell of a top-worked electrolysis cell is analyzed. The results of the analysis are used to find a technical solution which ensures a reduction in these losses and an improvement in the energy efficiency of such cells. © 2014 Springer Science+Business Media New York.

Shakhrai S.G.,Siberian Federal University | Kondrat'ev V.V.,Irkutsk State University | Belyanin A.V.,RUSAL Krasnoyarsk Company | Nikolaev V.N.,Irkutsk State University | Gron V.A.,Siberian Federal University
Metallurgist | Year: 2015

An analysis is made of the amount of heat lost in heating alumina to the temperature of the melt after it is charged into the reduction cell. Also analyzed are the amount of electric power consumed to make up for this loss and the amount of heat that the anode gases carry off into the gas exhaust system. A technical solution is proposed to reduce the amount of energy consumed by reduction cells with a self-baking anode. The solution entails using the heat of the anode gases to heat the alumina, which makes it possible to reduce unit electric-power consumption by 135–170 kWh/ton Al. © 2015 Springer Science+Business Media New York

Shakhrai S.G.,Siberian Federal University | Sharypov N.A.,Siberian Federal University | Belyanin A.V.,RUSAL Krasnoyarsk Company
Metallurgist | Year: 2015

This article examines problems related to the quality and production of anode paste for self-baking anodes in aluminum electrolysis cells. Results are presented from laboratory tests of a technology designed to thoroughly impregnate coke dust with coal-tar pitch by giving the dust and pitch opposite electrical charges in dc chargers during the paste production process. The technology significantly improves the quality of the paste while reducing its production cost and improving the technical-economic and environmental indices of aluminum production. These benefits are realized by increasing the degree of impregnation of coke dust by coal-tar pitch, reducing the friability of the anodes during service in electrolysis cells, and decreasing the amount of coal-based foam that is formed in the process. Increasing the productivity of the equipment used to make anode paste by shortening the time needed to mix the components also lowers production costs. Environmental indices are improved by shortening the time the cell is dehermetized, thus decreasing the unit quantity of fluorides released into the atmosphere. © 2015, Springer Science+Business Media New York.

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