Studies on the Hall-Heroult aluminum electrowinning process

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 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.

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Main Author: Prasad,Shiva
Format: Digital revista
Language:English
Published: Sociedade Brasileira de Química 2000
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000300008
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spelling oai:scielo:S0103-505320000003000082000-11-06Studies on the Hall-Heroult aluminum electrowinning processPrasad,Shiva aluminum electrowinning Hall-Heroult process electroreduction 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.info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society v.11 n.3 20002000-06-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000300008en10.1590/S0103-50532000000300008
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Prasad,Shiva
spellingShingle Prasad,Shiva
Studies on the Hall-Heroult aluminum electrowinning process
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
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.
publisher Sociedade Brasileira de Química
publishDate 2000
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000300008
work_keys_str_mv AT prasadshiva studiesonthehallheroultaluminumelectrowinningprocess
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