ISO 501:2012

INTERNATIONAL ISO
STANDARD 501
Fourth edition
2012-09-01
Hard coal — Determination of the
crucible swelling number
Houille — Détermination de l’indice de gonflement au creuset
Reference number
©
ISO 2012
© ISO 2012
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ii © ISO 2012 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Preparation of the test sample . 1
5 Apparatus . 1
6 Preparation of apparatus . 3
7 Procedure. 5
8 Expression of results . 7
9 Precision of the method . 7
9.1 Repeatability . 7
9.2 Reproducibility . 7
10 Test report . 7
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
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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
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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 501 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 5,
Methods of analysis.
This fourth edition cancels and replaces the third edition (ISO 501:2003), which has been technically revised.
iv © ISO 2012 – All rights reserved

INTERNATIONAL STANDARD ISO 501:2012(E)
Hard coal — Determination of the crucible swelling number
WARNING — Use of this International Standard can involve hazardous materials, operations
and equipment. This International Standard does not purport to address all of the safety issues
associated with its use. It is the responsibility of the user of this International Standard to
establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
1 Scope
This International Standard specifies a method for determining the swelling properties of hard coal
when heated in a covered crucible.
NOTE The “crucible swelling number” (CSN) is also known as the “free swelling index” (FSI).
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 13909-4, Hard coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples
ISO 18283, Hard coal and coke — Manual sampling
3 Principle
A sample of coal is heated in a covered crucible under standard conditions of time and temperature. The
shape of the coke button obtained is classified by comparison with the outlines of a set of standard profiles.
4 Preparation of the test sample
The test sample shall be the general analysis test sample prepared in accordance with ISO 13909-4
and ISO 18283. Ensure that the moisture content of the sample is in equilibrium with the laboratory
atmosphere, exposing it, if necessary, in a thin layer for the minimum time required to achieve equilibrium.
The sample used for the crucible swelling number (CSN) test should be ground to pass a 212 μm sieve.
Avoid very fine grinding, as CSN can be adversely affected with pulverization level. Once the sample is
prepared to this size specification, the test should be performed within 24 h in order to avoid oxidation
and a potentially misleading CSN result.
5 Apparatus
5.1 Crucible and lid (see Figure 1): silica crucible, squat form, and silica lid with ring handle.
The crucible shall conform to the following specifications:
External height: 26 ± 1,0 mm
External diameter at top: 41 ± 1,0 mm
Internal diameter at base: 14 ± 3,0 mm
Mass: 12 ± 1,0 g
Capacity: 16 ml to 17,5 ml
Dimensions in millimetres
Key
1 flat surface required
2 lid
3 crucible
Figure 1 — Crucible with lid for swelling test
2 © ISO 2012 – All rights reserved

5.2 Pierced silica lid (see Figure 2), similar to that described in 5.1 but with a 6 mm hole through
which the thermocouple (5.7) can pass.
Dimensions in millimetres
Figure 2 — Pierced crucible lid
5.3 Triangle, consisting of silica tubing of 6 mm to 6,5 mm external diamete
...