Studies on the Hall-Heroult aluminum electrowinning process
Studies on the electrolysis of cryolite-alumina melt showed that even the best equipped smelter, functioning at 960 ºC, has only 33% energy efficiency. For stable functioning of the smelter at 3% alumina the minimum wt% ratio NaF/AlF3 was found to be 1.11. The anodes located on down-stream row were...
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Sociedade Brasileira de Química
2000-01-01
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doaj-cf967a81ba044583994da7f0e3a909f42020-11-24T21:22:49ZengSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society0103-50532000-01-01113245251Studies on the Hall-Heroult aluminum electrowinning processPrasad ShivaStudies on the electrolysis of cryolite-alumina melt showed that even the best equipped smelter, functioning at 960 ºC, has only 33% energy efficiency. For stable functioning of the smelter at 3% alumina the minimum wt% ratio NaF/AlF3 was found to be 1.11. The anodes located on down-stream row were found to face more turbulence; raising their level by 4 cm resulted in decreasing the number of burnoffs. A careful selection of potlining material improved the pot life. The stability of the aluminum-bath interface is one of the major factors affecting the current efficiency. An improved cell design has been proposed to achieve the ultimate aluminum-bath interface stability. The proposed cell design should allow a reduction of the cathode-to-anode distance producing a lower voltage and improving the power efficiency.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000300008aluminum electrowinningHall-Heroult processelectroreduction |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Prasad Shiva |
spellingShingle |
Prasad Shiva Studies on the Hall-Heroult aluminum electrowinning process Journal of the Brazilian Chemical Society aluminum electrowinning Hall-Heroult process electroreduction |
author_facet |
Prasad Shiva |
author_sort |
Prasad Shiva |
title |
Studies on the Hall-Heroult aluminum electrowinning process |
title_short |
Studies on the Hall-Heroult aluminum electrowinning process |
title_full |
Studies on the Hall-Heroult aluminum electrowinning process |
title_fullStr |
Studies on the Hall-Heroult aluminum electrowinning process |
title_full_unstemmed |
Studies on the Hall-Heroult aluminum electrowinning process |
title_sort |
studies on the hall-heroult aluminum electrowinning process |
publisher |
Sociedade Brasileira de Química |
series |
Journal of the Brazilian Chemical Society |
issn |
0103-5053 |
publishDate |
2000-01-01 |
description |
Studies on the electrolysis of cryolite-alumina melt showed that even the best equipped smelter, functioning at 960 ºC, has only 33% energy efficiency. For stable functioning of the smelter at 3% alumina the minimum wt% ratio NaF/AlF3 was found to be 1.11. The anodes located on down-stream row were found to face more turbulence; raising their level by 4 cm resulted in decreasing the number of burnoffs. A careful selection of potlining material improved the pot life. The stability of the aluminum-bath interface is one of the major factors affecting the current efficiency. An improved cell design has been proposed to achieve the ultimate aluminum-bath interface stability. The proposed cell design should allow a reduction of the cathode-to-anode distance producing a lower voltage and improving the power efficiency. |
topic |
aluminum electrowinning Hall-Heroult process electroreduction |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000300008 |
work_keys_str_mv |
AT prasadshiva studiesonthehallheroultaluminumelectrowinningprocess |
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