ISO 10753:2019

INTERNATIONAL ISO
STANDARD 10753
Second edition
2019-06
Coal preparation plant — Assessment
of the liability to breakdown in water
of materials associated with coal seams
Ateliers de préparation du charbon — Évaluation de la fiabilité de
la fragmentation dans l'eau de matériaux associés aux gisements
de charbon
Reference number
©
ISO 2019
© ISO 2019
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Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagent . 1
6 Apparatus . 1
7 Sampling and preparation of test sample . 5
8 Procedure. 5
8.1 Determination of initial moisture content . 5
8.2 Preparation of test portion . 5
8.3 Determination of residual moisture content . 5
8.4 Agitation of test portion . 5
8.5 Sieving of suspension . 5
8.6 Treatment of fines . 6
8.7 Preparation of water and apparatus for sedimentation . 6
8.8 Adjustment of concentration of suspension . 6
8.9 Determination of settling time . 6
8.10 Determination of particles below 10 μm nominal size (slimes) by sedimentation . 7
8.11 Number of tests . 7
9 Expression of results . 8
9.1 Material passing through the 500 μm test sieve . 8
9.2 Particles below 10 μm nominal size (slimes) . 8
9.2.1 No further dilution . 8
9.2.2 Further dilution . 8
9.3 Breakdown ratio . 9
10 Precision . 9
10.1 Repeatability limit . 9
10.2 Reproducibility limit . 9
11 Test method . 9
Annex A (informative) Calculation of settling time .11
Annex B (informative) Example of a suitable format for the test report .12
Foreword
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electrotechnical standardization.
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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).
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This document was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee
SC 1, Coal preparation. Terminology and performance.
This second edition cancels and replaces the first edition (ISO 10753:1994), of which it constitutes a
minor revision. The changes compared to the previous edition are as follows:
— editorial corrections throughout the document.
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

Introduction
In this document, the materials associated with coal seams are collectively referred to as “shale”,
although they may contain a variety of rocks and minerals. This document describes a method of
assessing the liability of these materials to breakdown on agitation with water. Future activity on
this subject could involve a method for simulating the breakdown that is likely to occur, in practice, in
different types of coal preparation plants, to generate samples for further testing.
The liability of the shale to breakdown is measured by the proportion of the degraded material passing
through a test sieve having a nominal size of openings of 500 μm.
The method described in this document also enables the liability of the shale to form slimes to be
assessed, by determining the proportion that is below a nominal particle size of 10 μm. using a
simplified sedimentation technique. This technique is based on the assumption that in the size range
being examined, all the particles are spherical, have a relative density of 2,5, and fall freely through the
suspending liquid according to Stokes's Law. These conditions are not entirely fulfilled in practice and
the particle size is, therefore, referred to as a nominal value. The extent of breakdown, as measured
by this method, will be affected by whether the shale exhibits any self-flocculation. In the described
test, distilled water (or the equivalent) is used to avoid possible flocculation of the shale by any soluble
salts in the water. The test may be adapted to assess the relative tendencies of shales to break down in
a particular plant, by using the same water as is used in that plant. However, it is emphasized that the
results of such tests, using plant water, have to be treated with caution because the extent of breakdown
that will occur in practice is influenced by the interaction of all the components present during the
washing process, including, for example, any accumulation of soluble salts in the circuit, and by other
factors, such as the residence time in the plant.
The relationship between the proportion of degraded material passing a 500 μm test sieve and the
proportion of slimes provides useful information on the character of the breakdown, and is therefore
included in the results that are reported.
The amount of breakdown occurring in practice and in the test will be affected by the history of
the sample. For this reason, the sample is placed in a sealed container as soon as is practicable after
being taken.
INTERNATIONAL STANDARD ISO 10753:2019(E)
Coal preparation plant — Assessment of the liability to
breakdown in water of materials associated with coal seams
1 Scope
This document specifies a method for assessing the liability of materials associated with coal seams to
breakdown on agitation with water.
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 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
3 Terms and definitions
No terms and definitions are listed in this document.
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/
4 Principle
Degradation of a test portion of shale in the size range 5,6 mm to 2,8 mm, by controlled agitation
in water. Determination of the proportion of degraded material passing through a 500 μm sieve,
and determination of the proportion of degraded material of nominal top size less than 10 μm by
sedimentation.
5 Reagent
During the test, use only distilled water or water of equivalent purity.
6 Apparatus
6.1 Rigid cylindrical jar, of non-corrodible material and of capacity 1,0 l ± 0,1 l, with an internal
height of approximately 170 mm (internal diameter approximately 85 mm) and a height/diameter ratio
2,0 ± 0,1.
The jar shall have a hard lid which can be secured to form a watertight seal.
6.2 Rotation machine, capable of rotating the jar about a transverse axis at a rotational frequency of
−1 −1
40 min ± 1 min (speed of 40 r/min ± 1 r/min).
A typical assembly is shown in Figure 1.
NOTE A suitable drive can be provided by a 0,1 kW single-phase motor running at 1 500 r/min, geared down
to 40 r/min.
6.3 Test sieve, having nominal size of openings 500 μm, which shall comply with ISO 3310-1.
This sieve is liable to suffer minor distortion when heated to 105 °C (see 8.5) and should therefore
be reserved exclusively for use in this test. Furthermore, it is important to ensure that the sieve is
constructed of materials that are stable at the temperature of drying.
Key
1 electric motor geared to 40 r/min
2 rotating base plane
3 clamp for jar
4 litre jar
Figure 1 — Typical apparatus for the determination of breakdown characteristics in water
6.4 Funnel, into which the 500 μm test sieve (6.3) will fit.
6.5 Heat-resistant tray, of non-corrodible material, large enough to accommodate the 500 μm test sieve.
6.6 Container, of capacity approximately 100 ml, fitted with a cover.
6.7 Two test sieves, having nominal sizes of openings 5,6 mm and 2,8 mm, which shall comply with
ISO 3310-1.
6.8 Two measuring cylinders, of capacity 1 l each, fitted with stoppers.
2 © ISO 2019 – All rights reserved

6.9 Modified Andreasen sedimentation apparatus, comprising (see Figure 2) a measuring cylinder,
having a pipette connected to a 10 ml reservoir via a three-way stopcock. The neck of the flask is fitted
with a ground-glass stopper which has a small opening to allow air to enter the flask when a sample
is withdrawn, by applying suction as shown in Figure 2; an outlet allows the sample to be run off. The
Andreasen sedimentation apparatus is modified by reducing the length of stem of the pipette, so that the
sample is withdrawn at the 100 mm mark. The apparatus shall be protected from all sources of vibration
during the test.
6.10 Suction device, capable of applying a steady, controlled suction to the sedimentation pipette (6.9).
NOTE An aspirator is preferred for this purpose.
6.11 Evaporating dish, of nickel or stainless steel, having a diameter o
...