Decreasing of ohmic loss of stress at gas-containing elcectrolyte layer in electrolytic cell with self-baking anode

Тип публикации: статья из журнала

Год издания: 2014

Ключевые слова: Aluminum electrolysis, Analysis, Electrolyte, Energy and resource saving, Energy efficiency, Gas-containing layer, Self-baking anode, State politics, Voltage loss

Аннотация: This paper presents the analysis of voltage loss at gas-containing electrolyte 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. © Designed by: "Ore and Metals" Publishing House.

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Издание

Журнал: Tsvetnye Metally

Выпуск журнала: Is. 8

Номера страниц: 46-49

Авторы

  • Shakhray S.G. (Siberian Federal University, Krasnoyarsk, Russian Federation)
  • Belyanin A.V. (JSC RUSAL Krasnoyarsk, Krasnoyarsk, Russian Federation)
  • Kondratev V.V. (Irkutsk National Research Technical University, Irkutsk, Russian Federation)
  • Lapaev I.I. (LLC RUSAL Engineering-Technical Center, Krasnoyarsk, Russian Federation)

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