ISO 15379-2:2015
(Main)Carbonaceous materials for the production of aluminium — Cathode block materials — Part 2: Determination of the expansion due to sodium penetration without application of pressure
Carbonaceous materials for the production of aluminium — Cathode block materials — Part 2: Determination of the expansion due to sodium penetration without application of pressure
ISO 15379-2:2015 specifies a method that covers the determination of linear expansion under external pressure due to sodium penetration in cathode-block materials used in the production of aluminium. The linear expansion of the blocks depends on the sampling direction due to anisotropy.
Produits carbonés utilisés pour la production de l'aluminium — Blocs cathodiques — Partie 2: Détermination de l'expansion due à la pénétration du sodium sans application de pression
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INTERNATIONAL ISO
STANDARD 15379-2
Second edition
2015-05-15
Carbonaceous materials for the
production of aluminium — Cathode
block materials —
Part 2:
Determination of the expansion
due to sodium penetration without
application of pressure
Produits carbonés utilisés pour la production de l’aluminium — Blocs
cathodiques —
Partie 2: Détermination de l’expansion due à la pénétration du
sodium sans application de pression
Reference number
ISO 15379-2:2015(E)
©
ISO 2015
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ISO 15379-2:2015(E)
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ii © ISO 2015 – All rights reserved
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ISO 15379-2:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Apparatus . 1
5 Reagents . 2
6 Sampling . 2
7 Procedure. 3
8 Results . 3
8.1 Calculation . 3
8.2 Precision . 3
9 Test report . 4
© ISO 2015 – All rights reserved iii
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ISO 15379-2:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Details of any patent rights identified during the development of the document will be in the Introduction
and/or on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT), see the following URL: Foreword — Supplementary information.
The committee responsible for this document is ISO/TC 226, Materials for the production of primary aluminium.
This second edition cancels and replaces the first edition (ISO 15379-2:2004), which has been
technically revised.
ISO 15379 consists of the following parts, under the general title Carbonaceous materials for the
production of aluminium — Cathode block materials:
— Part 1: Determination of the expansion due to sodium penetration with application of pressure
— Part 2: Determination of the expansion due to sodium penetration without application of pressure
iv © ISO 2015 – All rights reserved
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ISO 15379-2:2015(E)
Introduction
Expansion due to sodium penetration is an important property of carbon cathode blocks. As soon as
alumina electrolysis starts, sodium penetrates into the carbon cathode blocks causing swelling of these
blocks. This increase in volume creates mechanical stresses within the blocks and/or bulging of the
bottom block plate. This can lead to cracks through which liquid aluminium and/or liquid electrolyte
can flow, reaching the thermal insulation beneath the blocks and destroying these ceramic materials.
In such a case, the electrolysis cell has to be relined, resulting in loss of aluminium production and high
expenses. Therefore, cathode blocks produced with materials allowing only low sodium penetration
and having the lowest possible expansion due to sodium penetration are preferred.
The study can be supplemented by measuring electrical resistivity (see ISO 11713) before and after the test.
© ISO 2015 – All rights reserved v
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INTERNATIONAL STANDARD ISO 15379-2:2015(E)
Carbonaceous materials for the production of
aluminium — Cathode block materials —
Part 2:
Determination of the expansion due to sodium penetration
without application of pressure
1 Scope
This part of ISO 15379 specifies a method that covers the determination of linear expansion under external
pressure due to sodium penetration in cathode-block materials used in the production of aluminium.
The linear expansion of the blocks depends on the sampling direction due to anisotropy.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edit
...
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