ISO 589:2003

SLOVENSKI STANDARD
SIST ISO 589:2005
01-november-2005
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Hard coal -- Determination of total moisture
Houille -- Détermination de l'humidité totale
Ta slovenski standard je istoveten z: ISO 589:2003
ICS:
73.040 Premogi Coals
SIST ISO 589:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 589:2005

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SIST ISO 589:2005


INTERNATIONAL ISO
STANDARD 589
Third edition
2003-11-15


Hard coal — Determination of total
moisture
Houille — Détermination de l'humidité totale




Reference number
ISO 589:2003(E)
©
ISO 2003

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SIST ISO 589:2005
ISO 589:2003(E)
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ii © ISO 2003 — All rights reserved

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SIST ISO 589:2005
ISO 589:2003(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle . 2
4.1 Method A (two-stage methods) . 2
4.2 Method B (single-stage methods) . 2
5 Reagent . 2
6 Apparatus. 2
7 Sample. 3
7.1 General. 3
7.2 Sampling and sample preparation . 3
7.3 Precautions against loss of moisture. 3
7.4 Moisture determination with on-site treatment (method A only) . 4
7.5 Moisture determination without on-site treatment (methods A and B). 4
8 Procedure. 4
8.1 Methods A 1 and A 2 (two-stage methods) . 4
8.2 Methods B (single-stage method) . 6
9 Precision . 7
9.1 Repeatability limit . 7
9.2 Reproducibility critical difference . 7
10 Test report. 7

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SIST ISO 589:2005
ISO 589:2003(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 589 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 5, Methods
of analysis.
This third edition cancels and replaces the second edition (ISO 589:1981), which has been technically revised.
iv © ISO 2003 — All rights reserved

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SIST ISO 589:2005
ISO 589:2003(E)
Introduction
Moisture is an important parameter in respect of coal quality.
The moisture content of coal is not an absolute value and conditions for its determination have to be
standardized. Results given by the different methods specified here should be comparable within the limits of
the tolerance quoted.
The determination of the total moisture content of hard coals is always to be considered in close connection
with sampling. Therefore this International Standard has been prepared in close relationship with the series
ISO 13909, Hard coal and coke — Mechanical sampling.
A major problem with the preparation of test samples for the determination of moisture is the risk of bias due
to inadvertent loss of moisture. This is dependent on the tightness of the sealing of sampling containers, the
level of moisture content in the sample, the ambient conditions, the type of coal and the reduction and division
procedures used. This is described in detail in ISO 13909-4.
Depending on the mass, the nominal top size and the facilities available where samples are taken, it is
possible to dry the sample directly after sampling (air-drying), then to reduce the particle size and prepare a
test sample for determination of moisture in the air-dried sample. Alternatively, the whole sample may be
transported to the laboratory and the total moisture determined.

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SIST ISO 589:2005

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SIST ISO 589:2005
INTERNATIONAL STANDARD ISO 589:2003(E)

Hard coal — Determination of total moisture
1 Scope
This International Standard describes two methods for the determination of the total moisture content of hard
coals. Depending on the coal rank, there may be systematic differences between the results obtained by
applying different methods on subsamples of the same sample. Methods using a nitrogen atmosphere are
suitable for all hard coals; methods with drying in air are only suitable for hard coals not susceptible to
oxidation.
NOTE The term “not susceptible to oxidation” cannot be defined easily. Usually, coals very high in rank are not
oxidized under the conditions described in this standard. For all other types of coal this has to be verified by experiments.
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 1213-2, Solid mineral fuels — Vocabulary — Part 2: Terms relating to sampling, testing and analysis
ISO 1988, Hard coal — Sampling
ISO 11722, Solid mineral fuels — Hard coal — Determination of moisture in the general analysis test sample
by drying in nitrogen
ISO 13909-1:2001, Hard coal and coke — Mechanical sampling — Part 1: General introduction
ISO 13909-2:2001, Hard coal and coke — Mechanical sampling — Part 2: Coal — Sampling from moving
streams
ISO 13909-3:2001, Hard coal and coke — Mechanical sampling — Part 3: Coal — Sampling from stationary
lots
ISO 13909-4:2001, Hard coal and coke — Sampling — Part 4: Coal — Preparation of test samples
ISO 13909-8:2001, Hard coal and coke — Mechanical sampling — Part 8: Methods of testing for bias
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1213-2 apply.
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SIST ISO 589:2005
ISO 589:2003(E)
4 Principle
4.1 Method A (two-stage methods)
4.1.1 Method A 1: Drying under nitrogen
The sample is dried in air at ambient temperatures or at elevated temperatures not exceeding 40 °C (first
stage or free moisture) and the loss in mass recorded. The air-dried sample is crushed to 2,8 mm nominal top
size and subsamples are dried at 105 - 110 °C in a nitrogen-flushed oven (second stage or residual moisture).
NOTE Residual moisture is often called moisture in the air-dried sample.
Provided that the result obtained for the determination of moisture in the analysis sample in accordance with
ISO 11722 can be shown to give the same result as that for the second-stage moisture determination, the
former may be used.
The moisture is calculated from the loss in mass at each of the two stages.
4.1.2 Method A 2: Drying in air
The sample is dried in air at ambient temperatures or at elevated temperatures not exceeding 40 °C (first
stage or free moisture) and the loss in mass in recorded. The air-dried sample is crushed to 2,8 mm nominal
top size and subsamples are dried at 105 - 110 °C (second stage or residual moisture).
The moisture is calculated from the loss in mass at each of the two stages.
NOTE This method is only suitable for hard coals not susceptible to oxidation.
4.2 Method B (single-stage methods)
4.2.1 Method B 1: Drying under nitrogen
The sample is crushed to 11,2 mm nominal top size. A subsample is dried in a nitrogen-flushed oven at a
temperature of 105 - 110 °C. The moisture is calculated from the loss in mass.
4.2.2 Method B 2: Drying in air
The sample is crushed to 11,2 mm nominal top size. A subsample is dried at a temperature of 105 - 110 °C.
The moisture is calculated from the loss in mass.
NOTE This method is only suitable for hard coals not susceptible to oxidation.
5 Reagent
Nitrogen, moisture-free, having an oxygen content of less than 30 µl/l.
NOTE Commercially available nitrogen with a water content of less than 5 µl/l does not require further drying.
6 Appar
...