ISO 2926:2005

Aluminium oxide used for the production of primary aluminium — Particle size analysis for the range 45 µm to 150 µm — Method using electroformed sieves

ISO 2926:2005 specifies a dry sieve method using electroformed sieves for determining the mass distribution of the particle sizes in aluminium oxide used for the production of primary aluminium. ISO 2926:2005 is applicable to calcined aluminium oxide containing a maximum of 20 % mass fraction of particles having a mean diameter exceeding 150 m, and containing a maximum of 15 % mass fraction of particles having a mean diameter less than 45 m. ISO 2926:2005 is not applicable to the use of wire woven sieves.

Oxyde d'aluminium utilisé pour la production d'aluminium primaire — Analyse granulométrique dans la gamme 45 µm à 150 µm — Méthode par emploi de tamis électroformés

General Information

• Status: Withdrawn
• Publication Date: 20-Mar-2005
• Withdrawal Date: 20-Mar-2005
• 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: 14-Aug-2013

Relations

• Revised: ISO 2926:2013 - Aluminium oxide used for the production of primary aluminium — Particle size analysis for the range 45 µm to 150 µm — Method using electroformed sieves
• Effective Date: 07-Aug-2008
• Revises: ISO 2926:1974 - Aluminium oxide primarily used for the production of aluminium — Particle size analysis — Sieving method
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 2926
Second edition
2005-03-15


Aluminium oxide used for the production
of primary aluminium — Particle size
analysis for the range 45 µm to 150 µm —
Method using electroformed sieves
Oxyde d'aluminium utilisé pour la production d'aluminium primaire —
Analyse granulométrique dans la gamme 45 µm à 150 µm — Méthode
par emploi de tamis électroformés




Reference number
ISO 2926:2005(E)
©
ISO 2005

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ISO 2926:2005(E)
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ii © ISO 2005 – All rights reserved

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ISO 2926:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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 2926 was prepared by Technical Committee ISO/TC 226, Materials for the production of primary
aluminium.
This second edition cancels and replaces the first edition (ISO 2926:1974), which has been technically revised
to reflect modern industry practice, and has substantially improved accuracy and precision over the first
edition. The major changes are:
 the mandatory use of electroformed sieves instead of woven wire sieves;
 the mandatory use of a sieve shaker with a vertical hammer-drop action concurrent with the lateral
sieving action;
 a different set of nominal aperture sizes to correspond to modern industry practice;
 weighing of fractions "on-sieve" rather than "off-sieve";
 changed sample preparation (no pre-drying);
 removal of the limit of 50 % atmospheric relative humidity;
 calculation of percentages using a "mass recovered" denominator rather than "original mass".
© ISO 2005 – All rights reserved iii

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ISO 2926:2005(E)
Introduction
This International Standard is based on AS 2879.6-1995 prepared by Standards Australia.

iv © ISO 2005 – All rights reserved

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INTERNATIONAL STANDARD ISO 2926:2005(E)

Aluminium oxide used for the production of primary
aluminium — Particle size analysis for the range 45 µm to
150 µm — Method using electroformed sieves
1 Scope
This International Standard specifies a dry sieve method using electroformed sieves for determining the mass
distribution of the particle sizes in aluminium oxide used for the production of primary aluminium.
This method is applicable to calcined aluminium oxide containing a maximum of 20 % mass fraction of
particles having a mean diameter exceeding 150 µm, and containing a maximum of 15 % mass fraction of
particles having a mean diameter less than 45 µm.
This method is not applicable to the use of woven wire sieves.
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 3310-3, Test sieves — Technical requirements and testing — Part 3: Test sieves of electroformed sheets
3 Principle
A test portion of the crude sample is sieved mechanically through electroformed sieves.
Each of the separate fractions is weighed on the sieve, and a cumulative mass of material retained on each
sieve aperture size is calculated.
4 Apparatus
4.1 Test sieves, each including a sieving medium (screen) and a frame.
The frames shall be cylindrical, having nominal diameters of 200 mm and heights between 50 mm and 75 mm.
A lid and a bottom receiver shall be included. The sieves, lid and bottom receiver shall be capable of being
1)
fitted together tightly to form a series of test sieves .
The screens shall be constructed of smooth electroformed sheet having square openings. The aperture
tolerances shall be in accordance with ISO 3310-3.

1) Certified electroformed sieves manufactured by Bukbee-Meers of St Paul, Minnesota, USA, are examples of suitable
products available commercially. This information is given for the convenience of users of this International Standard and
does not constitute an endorsement by ISO of these products.
© ISO 2005 – All rights reserved 1

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ISO 2926:2005(E)
The sieve apertures shall have nominal sizes of 150 µm, 106 µm, 75 µm, 53 µm and 45 µm.
4.2 Mechanical sieve shaker, capable of clamping the sieves mounted inside each other together with the
top lid and bottom receiver to form a vertical assembly.
2)
The apparatus shall impart to the sieve assembly a simultaneous horizontal rotary motion and a vertical
tapping action resulting from the fall of a hammer. This combined action shall cause sufficient displacement of
the aluminium oxide particles to prevent aggregation but not cause any deformation of the sieving screen or
any size reduction of the aluminium oxide particles through shock or abrasion.
4.3 Laboratory top pan balance, capable of weighing the sieves to the nearest 0,01 g.
The balance may be fitted with a lightweight frame mounted on the weighing pan to enable direct weighing of
test sieves and receiver.
4.4 Ultrasonic bath, of sufficient capacity to immerse one test sieve fully in a vertical plane to prevent
cav
...