ISO 12900:2015

SLOVENSKI STANDARD
SIST ISO 12900:2016
01-maj-2016
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SIST ISO 12900:2000
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Hard coal - Determination of abrasiveness
Houille - Détermination de l'abrasivité
Ta slovenski standard je istoveten z: ISO 12900:2015
ICS:
73.040 Premogi Coals
SIST ISO 12900:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 12900:2016

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SIST ISO 12900:2016
INTERNATIONAL ISO
STANDARD 12900
Second edition
2015-06-01
Hard coal — Determination of
abrasiveness
Houille — Détermination de l’abrasivité
Reference number
ISO 12900:2015(E)
©
ISO 2015

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SIST ISO 12900:2016
ISO 12900:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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ii © ISO 2015 – All rights reserved

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SIST ISO 12900:2016
ISO 12900:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Apparatus . 1
5 Sample preparation . 4
6 Procedure. 7
7 Calculation . 7
8 Reporting of results . 7
9 Precision of the determination . 7
10 Test report . 8
Bibliography . 9
© ISO 2015 – All rights reserved iii

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SIST ISO 12900:2016
ISO 12900:2015(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 27, Solid mineral fuels, Subcommittee SC 5,
Methods of analysis.
This second edition cancels and replaces the first edition (ISO 12900:1997), of which it constitutes a
minor revision.
iv © ISO 2015 – All rights reserved

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SIST ISO 12900:2016
ISO 12900:2015(E)

Introduction
The abrasiveness of coal is recognized as a factor in coal operations, from mining to utilization, requiring
a standard method of measurement and evaluation, as some coals are more abrasive than others.
The interaction between coal and conveying, storage, and crushing equipment results in component
wear. In particular, higher contact pressures in some coal pulverizers result in significant wear.
[1]
For the ranking or relative comparison of the abrasiveness of coals, a test was developed which
standardized the following equipment variables:
a) test equipment dimensions and tolerances;
b) speed of rotation of wearing components;
c) properties of the wearing components;
d) mass of the test portion;
e) top particle size of the test portion;
f) duration of the test.
The abrasiveness of coal is generally a function of two factors: the physical properties of the coal, in
[1] [2] [3] [4] [5] [6]
particular, moisture content, mineral content, and mineral characteristics; the mechanics
of the operations to which the coal is subjected.
NOTE Moisture contents over 10 % in the test sample after air-drying and laboratory equilibration might
give anomalous results; the reason for this has not been established.
Wear on coal-pulverizing elements in industrial mills is influenced by the physical characteristics of
the coal and its mineral constituents, the mechanical characteristics of the mill, including the milling
pressures, alloy material properties and coal feed flow, and the operation of the mill. Abrasiveness as
determined by this International Standard has been demonstrated to provide initial empirical estimates
of specific wear rates in certain types of industrial tube-ball mills, vertical spindle mills, and high-speed
[3] [6]
hammer mills, with different coefficients for each mill type.
Abrasiveness as determined by this International Standard might be of value in providing an initial
estimate of the likely wear in other applications, giving the relative effect of different coals.
© ISO 2015 – All rights reserved v

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SIST ISO 12900:2016

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SIST ISO 12900:2016
INTERNATIONAL STANDARD ISO 12900:2015(E)
Hard coal — Determination of abrasiveness
1 Scope
This International Standard describes a method for determining the abrasiveness of hard coal.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 589, Hard coal — Determination of total moisture
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 13909-2, Hard coal and coke — Mechanical sampling — Part 2: Coal — Sampling from moving streams
ISO 13909-3, Hard coal and coke — Mechanical sampling — Part 3: Coal —Sampling from stationary lots
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
Four standard steel blades are rotated under specified conditions in a 2 kg mass of prepared coal in a
test machine. The abrasiveness is calculated from the mass of steel lost during the test.
4 Apparatus
4.1 Abrasion test machine, comprising the following components:
4.1.1 Blades, of the following types:
1)
a) A set of four reference blades , having a Vickers hardness of 160 ± 15 when tested in accordance
with ISO 6507-1. When new, the blades, machined with the bar rolling direction parallel to the line
of the bolt holes, from a bar of carbon steel, shall have the shape, dimensions, and surface finish
shown in Figure 1. To reduce the extent of varying hardness near the surface, care should be taken
during machining to minimize surface
...