INTERNATIONAL ISO
STANDARD 567
Third edition
2021-08
Coke — Determination of bulk density
in a small container
Coke — Détermination de la masse volumique en vrac dans un
récipient de petites dimensions
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ISO 567:2021
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Reference number
ISO 567:2021(E)
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ISO 567:2021(E)
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ISO 567:2021(E)
Contents Page
Foreword......................................................................................................................................................................................................................................... iv
Introduction...................................................................................................................................................................................................................................v
1 Scope.................................................................................................................................................................................................................................. 1
2 Normative references....................................................................................................................................................................................... 1
3 Terms and definitions...................................................................................................................................................................................... 1
4 Principle......................................................................................................................................................................................................................... 1
5 Apparatus...................................................................................................................................................................................................................... 1
6 Test sample.................................................................................................................................................................................................................. 2
7 Procedure..................................................................................................................................................................................................................... 2
8 Expression of results......................................................................................................................................................................................... 2
9 Precision........................................................................................................................................................................................................................ 3
9.1 Repeatability.............................................................................................................................................................................................. 3
9.2 Reproducibility........................................................................................................................................................................................ 3
10 Test report.................................................................................................................................................................................................................... 3
Bibliography................................................................................................................................................................................................................................. 4
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ISO 567:2021(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
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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).
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This document was prepared by Technical Committee ISO/TC 27, Coal and coke, Subcommittee SC 3,
Coke. ISO 567:2021
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This third edition cancels and replaces the 072b733fd671/iso-567-2021
second edition (ISO 567:1995), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— General and technical revision.
— The container to be used for determination of coke bulk density can either be cubical or cylindrical
in shape with a capacity 0,2 m3.
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 567:2021(E)
Introduction
The bulk density of coke depends on its physical characteristics, e.g. apparent relative density, shape
and size of the coke particles, and on the dimensions of the container. The container specified in this
International Standard has a capacity of 0,2 m3. The determination of bulk density of coke in a large
container is described in ISO 1013.
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INTERNATIONAL STANDARD ISO 567:2021(E)
Coke — Determination of bulk density in a small container
1 Scope
This document specifies a method for the determination of the bulk density of coke in a cubical or
cylindrical container of small capacity (0,2 m3). It is applicable to coke with a nominal top size not
greater than 125 mm.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 579, Coke — Determination of total moisture
ISO 728, Coke — Size analysis by sieving
ISO 13909-5, Hard coal and coke — Mechanical sampling — Part 5: Coke — Sampling from moving streams
ISO 13909-6, Hard coal and coke — Mechanical sampling — Part 6: Coke — Preparation of test samples
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ISO 18283, Hard coal and coke — Manual sampling
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3 Terms and definitions ISO 567:2021
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For the purposes of this document, the following terms and definitions apply.
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ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://w ww.iso.org/obp
— IEC Electropedia: available at https://w ww.electropedia.org/
3.1
coke bulk density
mass of a portion of coke divided by the volume of the container, which is filled by that portion under
specified conditions outlined in the procedure
4 Principle
A container of known mass and volume is filled with coke and the increase in mass is determined.
5 Apparatus
5.1 Cubical or cylindrical container, of small capacity (0,2 m3), with a smooth inner surface, and
rigidly constructed. The exact volume of the small container shall be known. The container shall be
waterproof and be resistant to deformation. A 200 l container (44 gallon drum) or a 100 l container is
suitable for this purpose. A 44 gallon drum sliced to a height of 50 % is also suitable for this purpose.
5.2 Mass determination scale/machine, preferably of the platform type, of minimum capacity 200 kg
and sufficiently accurate that the mass determination error does not exceed 0,1 % of the maximum load
or 250 g, whichever is the smaller.
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6 Test sample
Take a representative sample in accordance with ISO 13909-5 or ISO 18283. It is recommended that
enough sample is taken to allow duplicate determinations and a reserve. Test samples of 3 × 200 kg for
cokes ≤100 mm and for cokes 125 mm × 100 mm sample masses of 1 000 kg are recommended.
7 Procedure
Determine the mass of the empty container by weighing the empty container, clean and dry on the scale
or weighing machine (5.2) and record its mass, m1. Fill the container with water of known density until
maximum capacity then determine the mass again. Determine the mass of water in the container and
calculate the exact volume of the container in cubic metres, V.
NOTE The initial determination of m1 and the volume of the container need only to be done in duplicate once
during the first test. Thereafter these results are recorded and can be used for subsequent tests.
The container is emptied, cleaned and dried before proceeding with the test. It is recommended that
the strip-mixing and splitting technique outlined in ISO 13909-6 and ISO 18283 be used to form the
increments from the test sample that are charged to the container. Charge the coke slowly into the
container until pieces of coke project above the top of the container across the whole surface. The height
of drop of the coke shall not exceed 250 mm from the mouth of the implement being used to transfer the
coke to the container, to the bottom of the container.
Slide a straight bar across the top of the container and remove any pieces of coke, which obstruct its
passage. Determine the mass of the container plus the coke sample on the scale or weighing machine
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(5.2) and record its mass, m2.
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Carry out a duplicate determination by repeating the procedure using a second portion of the test
sample.
ISO 567:2021
When the duplicate determinations are completed combine the test samples and prepare this sample
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for total moisture in accordance with ISO072b733fd671/iso-567-2021
13909-6 or ISO 18283. The resultant total moisture test
sample, M, shall be analysed in duplicate in accordance with ISO 579.
8 Expression of results
The bulk density in a small container, ρs, of the coke, in kilograms per cubic metre, on a dry basis, is
given by the following Formula (1):
m2 − m1 100 − M
ρs = × (1)
V 100
where
m1 is the mass, in kilograms, of the empty container;
m2 is the mass, in kilograms, of the container plus coke;
V is the capacity, in cubic metres, of the container;
M is the total moisture content of the coke, expressed as a percentage by mass, determined in
accordance with ISO 579.
Calculate the mean of the two determinations and report the result to three significant figures.
For calculation of the result on an "as sampled” basis, omit the correction factor for moisture, i.e.
"(100 − M)/100", in Formula (1).
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9 Precision
9.1 Repeatability
The results of duplicate determinations, carried out in the same laboratory by the same operator with
the same apparatus on representative portions of coke taken from the same test sample, should not
differ by more than 30 kg/m3.
9.2 Reproducibility
No value for reproducibility can be quoted for determinations carried out in different laboratories
because the transport of coke samples involves the risk of breakage and thus alteration of the size
distribution and the bulk density.
10 Test report
The test report shall include the following information:
a) The method used by reference to this document, i.e. ISO 567:2021.
b) For unknown cokes it is recommended that a complete identification of the sample including
recording the sample mass received and the total moisture determined be recorded.
c) A full-coke sample size analysis in accordance with ISO 728 from +125 mm to −10,0 mm is also
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recommended. Table 1 shows a typical example of a coke size analysis. However, the number and
screen aperture sizes used may be varied. For known sized cokes that are sampled regularly from
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the same source the need for size analysis on every sample for bulk density would not be necessary.
d) The date the test was completed. ISO 567:2021
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e) The results expressed in accordance with Clause 8.
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Table 1 — Coke sample size analysis
Sample identification:
Coke sample mass (kg):
Size fraction Fractional mass
mm %
>125
125 × 100
100 × 90
90 × 75
75 × 63
63 × 50
50 × 45
45 × 31,5
31,5 × 22,4
22,4 × 16,0
16,0 × 11,2
11,2 × 10,0
<10,0
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Bibliography
[1] ISO 1013, Coke — Determination of bulk density in a large container
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