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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Status
Published
Publication Date
17-Dec-2019
Current Stage
6060 - International Standard published
Start Date
27-Nov-2019
Completion Date
18-Dec-2019
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ISO 15585:2019 - Hard coal -- Determination of caking index
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INTERNATIONAL ISO
STANDARD 15585
Second edition
2019-12
Hard coal — Determination of caking
index
Houille — Détermination de l'indice d'agglutination
Reference number
ISO 15585:2019(E)
ISO 2019
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ISO 15585:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved
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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)
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.

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

constitute an endorsement.

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.
iv © ISO 2019 – All rights reserved
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ISO 15585:2019(E)
Introduction

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.
© ISO 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO 15585:2019(E)
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/
3.1
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

fraction.

NOTE Annexes A and B provide information on the extraction, preparation and testing of standard

anthracite.
6 Apparatus

6.1 Balance, analytical balance with a resolution of at least 0,1 % relative of the test portion mass.

© ISO 2019 – All rights reserved 1
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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).
2 © ISO 2019 – All rights reserved
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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
Key
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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