Hard coal — Determination of caking index

This document specifies a method of determination of caking index of hard coal. It is applicable to the evaluation of caking power of bituminous coal with random reflectance of vitrinite, Rr, greater than 0,6 % and less than or equal to 1,8 % (>0,6 % and ≤1,8 %).

Houille — Détermination de l'indice d'agglutination

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Second edition
Hard coal — Determination of caking
Houille — Détermination de l'indice d'agglutination
Reference number
ISO 15585:2019(E)
ISO 2019

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ISO 15585:2019(E)

© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ISO 15585:2019(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagent and materials . 1
6 Apparatus . 1
7 Preparation of test sample . 5
8 Procedure. 6
9 Expression of results . 6
10 Precision . 7
10.1 Repeatability limit . 7
10.2 Reproducibility limit . 7
11 Test report . 7
Annex A (informative) Extraction and preparation of standard anthracite
for caking index determination . 8
Annex B (informative) Quality test for standard anthracite used for caking index determination .9
Bibliography .12
© ISO 2019 – All rights reserved iii

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ISO 15585:2019(E)

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
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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 ISO documents 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 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
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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee
SC 5, Methods of analysis.
This second edition cancels and replaces the first edition (ISO 15585:2006), which has been technically
revised. The main changes compared to the previous edition are as follows:
— Change to test precision (both for repeatability, r, and reproducibility, R) resulting from ILS
conducted in 2016 and 2017.
— Additional information provided on anthracite sample packing and homogeneity test in Annex A
and standard deviation formula and flowchart for standard anthracite sample taking in Annex B.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
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ISO 15585:2019(E)

Caking index is a key parameter to identify the caking power of hard coal, which is a measurement
of the agglutinating strength between the coal particles and inert constituents after heating without
the contact of air. Coal caking characteristic is important and widely used in coking, gasification,
liquefaction and combustion industries.
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Hard coal — Determination of caking index
1 Scope
This document specifies a method of determination of caking index of hard coal. It is applicable to the
evaluation of caking power of bituminous coal with random reflectance of vitrinite, R , greater than
0,6 % and less than or equal to 1,8 % (>0,6 % and ≤1,8 %).
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
caking index
measure of the magnitude of the binding strength between coal particles or between coal particles and
inert particles after coal is heated at 850 °C
4 Principle
A portion of prepared sample of coal of limited size range and the standard anthracite are mixed under
defined conditions, and the mixture is carbonized rapidly. The crucible coke thus obtained is tested
for strength in a drum conforming to certain specifications. The caking power of the test sample is
expressed by the abrasive strength, i.e. resistance to breakage of the crucible coke.
5 Reagent and materials
5.1 Standard anthracite, having a moisture of less than 2,5 % in mass fraction, air-dried basis, an
ash of less than 4 % in mass fraction, dry basis and a volatile matter of less than 8 % in mass fraction,
dry, ash free basis. The size limits are 0,1 mm to 0,2 mm. The undersize content of 0,1 mm should not be
more than 6 % in mass fraction, and the oversize content of 0,2 mm should not be more than 4 % in mass
NOTE Annexes A and B provide information on the extraction, preparation and testing of standard
6 Apparatus
6.1 Balance, analytical balance with a resolution of at least 0,1 % relative of the test portion mass.
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ISO 15585:2019(E)

6.2 Crucible, porcelain, having the following dimensions (see Figure 1):
a) external diameter at the top: 40 mm ± 1,5 mm;
b) internal diameter at the base: 20 mm ± 1,5 mm;
c) external height: 40 mm ± 1,5 mm;
d) wall thickness: less than 2 mm.
Dimensions in millimetres
Figure 1 — Crucible and lid
6.3 Lid, porcelain, 1,5 mm to 2,0 mm thick, with a hole 2 mm in diameter in the centre (see Figure 1).
6.4 Stirrer, made of 1,0 mm to 1,5 mm diameter metal wire, having an 8 mm loop at one end (see
Figure 2).
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ISO 15585:2019(E)

Dimensions in millimetres
Figure 2 — Stirrer
6.5 Heat resistant weight, composed for example of Nichrome steel , with a mass of 110 g to 115 g
(see Figure 3).
Dimensions in millimetres
Figure 3 — Heat resistant weight
6.6 Press, for compressing the mixture of coal and standard anthracite under a weight having a 6 kg
mass (see Figure 4).
1) Nichrome is an example of a suitable product available commercially. This information is given for the
convenience of users of this document and does not constitute an endorsement by ISO of this product.
© ISO 2019 – All rights reserved 3

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ISO 15585:2019(E)

Dimensions in millimetres
1 bottom plate 6 dead plate 11 carriage
2 screw 7 back-up shaft 12 hand knob
3 round base 8 small shaft 13 press
4 steel tube 9 dump 14 lighting vertical shaft
5 connecting board 10 forelock 15 plug
Figure 4 — Press used for compressing the mixture of anthracite and test coal
6.7 Electric furnace, with a zone of uniform temperature and a temperature control device capable of
maintaining that zone at 850 °C ± 10 °C.
6.8 Drum, with a cover, driving shaft, transmission gear and electric motor for carrying out the
abrasion test on coke.
The drum (see Figure 5) has a 200 mm internal diameter, is 70 mm deep and is made of 3 mm thick
sheet iron. To the inside walls are welded two symmetrical sheet iron strips 70 mm long, 30 mm wide
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ISO 15585:2019(E)

and 2 mm thick. To close the drum, the cover is seated on a felt or rubber gasket and is secured by two
wing-nuts. The drum is rotated with the stub axle horizontal at (50 ± 0,5) r/min.
Dimensions in millimetres
Figure 5 — Drum used for test
6.9 Laboratory sieve, made of thin brass sheet or stainless steel sheet, with 1 mm round holes.
6.10 Stopwatch.
6.11 Brush.
6.12 Long handled tongs or rod, suitable for moving the weight.
7 Preparation of test sample
7.1 Crush the sample of air-dried coal to pass a 0,2 mm test sieve. Take care to avoid an excessive
production of particles below 0,1 mm. It is essential that 20 % to 40 % mass fraction of the total sample
consists of particles between 0,1 mm and 0,2 mm.
7.2 The test sample shall be kept in a tightly closed container. Determine caking index of the sample on
the same day after its preparation.

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