EN ISO 21079-2:2008

SLOVENSKI STANDARD
01-september-2008
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Chemical analysis of refractories containing alumina, zirconia, and silica - Refractories
containing 5 percent to 45 percent of ZrO2 (alternative to the X-ray fluorescence method)
- Part 2: Wet chemical analysis (ISO 21079-2:2008)
Chemische Analyse von aluminiumoxid-, zirkoniumoxid- und silicium(IV)-oxidhaltigen
feuerfesten Erzeugnissen - Feuerfeste Erzeugnisse mit einem Massenanteil an ZrO2 von
5 % bis 45 % (Alternative zum Röntgenfluoreszenzverfahren) - Teil 2: Nasschemische
Analyse (ISO 21079-2:2008)
Analyse chimique des matériaux réfractaires contenant de l'alumine, de la zircone et de
la silice - Matériaux réfractaires contenant de 5 % à 45 % de ZrO2 (méthode alternative
à la méthode par fluorescence de rayons X) - Partie 2: Analyse chimique par voie
humide (ISO21079-2:2008)
Ta slovenski standard je istoveten z: EN ISO 21079-2:2008
ICS:
71.040.40 Kemijska analiza Chemical analysis
81.080 Ognjevzdržni materiali Refractories
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 21079-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2008
ICS 81.080; 71.040.40
English Version
Chemical analysis of refractories containing alumina, zirconia,
and silica - Refractories containing 5 percent to 45 percent of
ZrO2 (alternative to the X-ray fluorescence method) - Part 2:
Wet chemical analysis (ISO 21079-2:2008)
Analyse chimique des matériaux réfractaires contenant de Chemische Analyse von aluminiumoxid-, zirkoniumoxid-
l'alumine, de la zircone et de la silice - Matériaux und silicium(IV)-oxidhaltigen feuerfesten Erzeugnissen -
réfractaires contenant de 5 % à 45 % de ZrO2 (méthode Feuerfeste Erzeugnisse mit einem Massenanteil an ZrO2
alternative à la méthode par fluorescence de rayons X) - von 5 % bis 45 % (Alternative zum
Partie 2: Méthodes d'analyse chimique par voie humide Röntgenfluoreszenzverfahren) - Teil 2: Nasschemische
(ISO 21079-2:2008) Analyse (ISO 21079-2:2008)
This European Standard was approved by CEN on 12 April 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21079-2:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 21079-2:2008) has been prepared by Technical Committee ISO/TC 33 "Refractories"
in collaboration with Technical Committee CEN/TC 187 “Refractory products and materials” the secretariat of
which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by October 2008, and conflicting national standards shall be withdrawn at
the latest by October 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 21079-2:2008 has been approved by CEN as a EN ISO 21079-2:2008 without any
modification.
INTERNATIONAL ISO
STANDARD 21079-2
First edition
2008-04-15
Chemical analysis of refractories
containing alumina, zirconia, and silica —
Refractories containing 5 % to 45 %
of ZrO (alternative to the X-ray
fluorescence method) —
Part 2:
Wet chemical analysis
Analyse chimique des matériaux réfractaires contenant de l'alumine,
de la zircone et de la silice — Matériaux réfractaires contenant de 5 %
à 45 % de ZrO (méthode alternative à la méthode par fluorescence
de rayons X) —
Partie 2: Méthodes d'analyse chimique par voie humide

Reference number
ISO 21079-2:2008(E)
©
ISO 2008
ISO 21079-2:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 21079-2:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Determination of silicon(IV) oxide. 2
4 Determination of aluminium oxide. 4
5 Determination of iron(III) oxide. 7
6 Determination of titanium(IV) oxide . 8
7 Determination of calcium oxide . 11
8 Determination of magnesium oxide. 12
9 Determination of sodium oxide by flame photometry . 13
10 Determination of potassium oxide by flame photometry . 14
11 Determination of chromium(III) oxide using diphenylcarbazide. 15
12 Determination of zirconium oxide (including hafnium oxide) by mandelic acid
(α-hydroxybenzeneacetic acid) gravimetric method. 16
13 Calculation and expression of test results .17
14 Test report . 17
Bibliography . 18

ISO 21079-2:2008(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 21079-2 was prepared by Technical Committee ISO/TC 33, Refractories.
ISO 21079 consists of the following parts, under the general title Chemical analysis of refractories containing
alumina, zirconia, and silica — Refractories containing 5 % to 45 % of ZrO (alternative to the X-ray
fluorescence method):
⎯ Part 1: Apparatus, reagents and dissolution
⎯ Part 2: Wet chemical analysis
⎯ Part 3: Flame atomic absorption spectrophotometry (FAAS) and inductively coupled plasma emission
spectrometry (ICP-AES)
iv © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 21079-2:2008(E)

Chemical analysis of refractories containing alumina, zirconia,
and silica — Refractories containing 5 % to 45 % of ZrO
(alternative to the X-ray fluorescence method) —
Part 2:
Wet chemical analysis
1 Scope
This part of ISO 21079 specifies methods for the chemical analysis of AZS (alumina, zirconia, and silica)
refractory products (containing 5 % to 45 % of ZrO ) and raw materials, using traditional (“wet”) methods.
This part of ISO 21079 is not applicable to MgO-based refractories.
This part of ISO 21079 gives alternatives to the X-ray fluorescence (XRF) method given in ISO 12677.
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.
1)
ISO 10058-2:— , Chemical analysis of magnesite and dolomite refractory products (alternative to the X-ray
fluorescence method) — Part 2: Wet chemical analysis
ISO 21079-1:2008, Chemical analysis of refractories containing alumina, zirconia and silica — Refractories
containing 5 % to 45 % of ZrO (alternative to the X-ray fluorescence method) — Part 1: Apparatus, reagents
and dissolution
ISO 21079-3:2008, Chemical analysis of refractories containing alumina, zirconia and silica — Refractories
containing 5 % to 45 % of ZrO (alternative to the X-ray fluorescence method) — Part 3: Flame atomic
absorption spectrophotometry (FAAS) and inductively coupled plasma emission spectrometry (ICP-AES)
ISO 21587-2:2007, Chemical analysis of aluminosilicate refractory products (alternative to the X-ray
fluorescence method) — Part 2: Wet chemical analysis
ISO 26845:2008, Chemical analysis of refractories — General requirements for wet chemical analysis, atomic
absorption spectrometry (AAS) and inductively coupled plasma atomic emission spectrometry (ICP-AES)
methods
1) To be published.
ISO 21079-2:2008(E)
3 Determination of silicon(IV) oxide
3.1 General
The determination of silicon(IV) oxide is carried out using one of the following methods.
a) Combined use of the dehydration or the coagulation and molybdenum blue methods. This method is
applied to samples consisting of more t
...