ISO 15379-2:2004

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 15379-2:2004 provides a method for the determination of the linear expansion of cathode block materials used in the production of aluminium due to sodium penetration. 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

General Information

• Status: Withdrawn
• Publication Date: 15-Jun-2004
• Withdrawal Date: 15-Jun-2004
• ICS: 71.100.10 - Materials for aluminium production
• Technical Committee: ISO/TC 226 - Materials for the production of primary aluminium
• Drafting Committee: ISO/TC 226 - Materials for the production of primary aluminium
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 22-May-2015

Relations

• Revised: ISO 15379-2:2015 - Carbonaceous materials for the production of aluminium — Cathode block materials — Part 2: Determination of the expansion due to sodium penetration without application of pressure
• Effective Date: 31-May-2014

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 15379-2
First edition
2004-06-15

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 15379-2:2004(E)
©
ISO 2004

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ISO 15379-2:2004(E)
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ii © ISO 2004 – All rights reserved

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ISO 15379-2:2004(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
9 Test report. 4

© ISO 2004 – All rights reserved iii

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ISO 15379-2:2004(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
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Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15379-2 was prepared by Technical Committee ISO/TC 47, Chemistry, Subcommittee SC 7, Aluminium
oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium industry.
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 2004 – All rights reserved

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ISO 15379-2:2004(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
must 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.
1)
The study can be supplemented by measuring electrical resistivity (see ISO 11713 ) before and after the test.


1) ISO 11713, Carbonaceous materials used in the production of aluminium — Cathode blocks and baked anodes —
Determination of electrical resistivity at ambient temperature
© ISO 2004 – All rights reserved v

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INTERNATIONAL STANDARD ISO 15379-2:2004(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 method covers the determination of linear expansion 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 referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method
for the determination of repeatability and reproducibility of a standard measurement method
ISO 8007-1, Carbonaceous materials for the production of aluminium — Sampling plans and sampling from
individual units — Part 1: Cathode blocks
ASTM E 220, Standard Test Method for Calibration of Thermocoup
...