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Journal of Siberian Federal University Chemistry
Article . 2017 . Peer-reviewed
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Low Voltage PFC Emission from Aluminium Cells

Authors: Thonstad, Jomar; Rolseth, Sverre;

Low Voltage PFC Emission from Aluminium Cells

Abstract

Известно, что при анодных эффектах на алюминиевых электролизерах выделяются газообразные перфторуглероды CF4 и C2F6. Данные соединения являются парниковыми газами, и в алюминиевой промышленности проводятся активные мероприятия по их сокращению. С 1990 по 2008 г. сокращение выбросов ПФУ достигло 90 %. Однако, в последние годы была получена сенсационная информация, главным образом от китайской алюминиевой промышленности, что непрерывные выбросы газообразных ПФУ на сериях электролиза алюминия не прекращаются даже в отсутствие анодных эффектов, составляя от 10 до 90 % от общего количества выбросов со срединным значением 70 %. В китайской алюминиевой промышленности это назвали «Выбросы ПФУ, не связанные с анодным эффектом». Данная информация была впоследствии подтверждена несколькими компаниями в разных странах, поэтому представляется, что данная проблема является всеобщей. Впервые это было обнаружено Уорреном Хопином (WarrenHaupin), сотрудником Alcoa в 1995 г., но в то время это не было принято всерьез. В настоящее время мы знаем больше. В недавнем сообщении Alcoa указывается, что низковольтные выбросы ПФУ обнаружены на всех исследуемых заводах электролиза с обожженными анодами и не зафиксированы в двух сериях электролизеров с анодами Содерберга. Возможные причины такого явления будут обсуждаться в статье

It is well known that the perfluorocarbon (PFC) gases CF4 and C2F6 are being emitted during anode effects in aluminium cells. These PFC compounds are very strong greenhouse gases, and the aluminium industry has made great efforts to reduce these emissions. From 1990 to 2008 a 90% reduction in PFC emissions has been achieved. However, during the last few years we have received new alarming information, mainly from the Chinese aluminium industry, that there is an almost continuous emission of PFC gases from aluminium potlines even in the absence of anode effects, and it accounts for 10 to 90% of the total PFC emissions, the median being 70%. They named it “Non-anode effect PFC emissions”. This information has later been confirmed from several sources, so it seems to be a universal problem. To our knowledge it was first detected by the late Warren Haupin of Alcoa in 1995, but apparently it was not taken seriously at that time. Now we know better. A recent report from Alcoa indicates that whereas low voltage PFC emissions were observed in all prebake plants being investigated, it was not detected in two Soderberg potlines. Possible reasons for that will be discussed

Keywords

PFC perfluorocarbons, перфторулероды (ПФУ), алюминиевый электролизер, anode effect, анодный эффект, aluminium electrolysis

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
7
Top 10%
Top 10%
Average
gold