Hard coal - Size analysis by sieving

This International Standard specifies reference methods for the size analysis of coal by manual sieving
(wet or dry), using test sieves of aperture sizes between 125 mm and 45 μm. A guide to sampling is
given in Annex A.
This International Standard is applicable to all hard coals. It is not applicable to coke or other
manufactured fuels.
In the case of pulverized coal which has been ground so that a high proportion passes through the test
sieve of smallest aperture size, the methods described in this International Standard will determine
only the percentage oversize.

Houille - Analyse granulométrique par tamisage

Črni premog - Določanje zrnatosti s sejalno analizo

Ta mednarodni standard določa referenčne metode za sejalno analizo premoga z ročnim sejanjem (mokrim ali suhim) pri uporabi preskusnih sejalnikov z velikostjo odprtine sita od 125 mm do 45 μm. Navodila za takšno vzorčenje so podana v dodatku A.
Ta mednarodni standard se uporablja za vse vrste črnega premoga. Ne uporablja se za koks ali druga proizvedena goriva.
V primeru premoga v prahu, ki je bil zmlet tako, da najmanjša velikost odprtine preskusnega sita prepusti velik delež premoga, metode, opisane v tem mednarodnem standardu, določajo le nadmerni odstotni delež.

General Information

Status
Published
Publication Date
28-Mar-2016
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
22-Mar-2016
Due Date
27-May-2016
Completion Date
29-Mar-2016

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INTERNATIONAL ISO
STANDARD 1953
Third edition
2015-11-15
Hard coal — Size analysis by sieving
Houille — Analyse granulométrique par tamisage
Reference number
ISO 1953:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 1953:2015(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

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.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 1953:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Apparatus ..................................................................................................................................................................................................................... 1

4.1 For all methods ....................................................................................................................................................................................... 1

4.2 For dry sieving ......................................................................................................................................................................................... 2

4.3 For wet sieving ........................................................................................................................................................................................ 2

5 Sampling of test sample ................................................................................................................................................................................ 2

5.1 General ........................................................................................................................................................................................................... 3

5.2 Drying ............................................................................................................................................................................................................. 3

5.3 Division (other than wet coal of nominal top size less than 4 mm) .......................................................... 3

5.4 Division of wet coal of nominal top size less than 4 mm .................................................................................... 4

6 Procedure..................................................................................................................................................................................................................... 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Dry sieving .................................................................................................................................................................................................. 4

6.2.1 Sample of maximum particle size greater than 22,4 mm ............................................................. 4

6.2.2 Sample of maximum particle size between 4 mm and 22,4 mm—

manual method ................................................................................................................................................................. 5

6.2.3 Sample of maximum particle size less than 4 mm—manual method ................................ 5

6.2.4 Sample of maximum particle size between 4 mm and 22,4 mm; minus

4 mm—mechanical method ................................................................................................................................... 6

6.3 Wet sieving ................................................................................................................................................................................................. 6

7 Expression of results ........................................................................................................................................................................................ 7

7.1 Calculation .................................................................................................................................................................................................. 7

7.2 Graphical presentation ..................................................................................................................................................................... 7

8 Test report ................................................................................................................................................................................................................... 8

Annex A (informative) Guide to sampling ....................................................................................................................................................12

Annex B (informative) Example of removal by wet sieving of fine material from a sample

having a maximum particle size less than 4 mm .............................................................................................................13

© ISO 2015 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 1953:2015(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 1, Coal

preparation: Terminology and performance.

This third edition cancels and replaces the second edition (ISO 1953:1994), of which it constitutes a

minor revision.
iv © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 1953:2015(E)
Introduction

Size analysis involves the separation of a sample of coal into size fractions having defined limits. In the

methods described in this International Standard the results are expressed in terms of the percentage

mass of coal remaining on sieves of different aperture sizes. This information can be of use in a number

of applications, including the following: assessing the yields of products from run-of-mine coals;

providing design data for coal preparation plants; checking that products from screening plants are

within the required limits; assessing the performance of coal-crushing plants; and selecting coals for

particular processes and equipment.
© ISO 2015 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 1953:2015(E)
Hard coal — Size analysis by sieving
1 Scope

This International Standard specifies reference methods for the size analysis of coal by manual sieving

(wet or dry), using test sieves of aperture sizes between 125 mm and 45 μm. A guide to sampling is

given in Annex A.

This International Standard is applicable to all hard coals. It is not applicable to coke or other

manufactured fuels.

In the case of pulverized coal which has been ground so that a high proportion passes through the test

sieve of smallest aperture size, the methods described in this International Standard will determine

only the percentage oversize.
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 1213-1, Solid mineral fuels — Vocabulary — Part 1: Terms relating to coal preparation

ISO 1213-2, Solid mineral fuels — Vocabulary — Part 2: Terms relating to sampling, testing and analysis

ISO 13909 (all parts), Hard coal and coke — Mechanical sampling
ISO 18283, Hard coal and coke — Manual sampling

ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth

ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1213-1 and ISO 1213-2 apply.

4 Apparatus
4.1 For all methods

4.1.1 Test sieves, exclusively round-hole or exclusively square-hole, complying with ISO 3310-1 or

ISO 3310-2, as appropriate.

The recommended series of test sieves for general purposes is 125 mm, 90 mm, 75 mm, 63 mm, 50 mm,

45 mm, 31,5 mm, 22,4 mm, 16 mm, 11,2 mm, 8 mm, 5,6 mm, 4 mm, 2 mm and 1 mm nominal aperture

sizes, square-hole, or the same sizes of round-hole sieves. If this series is inadequate for the sizing of

graded coals, sieves from the supplementary sizes 100 mm, 80 mm, 40 mm, 25 mm, 20 mm, 12,5 mm,

10 mm and 6,3 mm may be included. For samples greater than 125 mm, single square-hole gauges of the

required dimensions may be used for the larger pieces. Test sieves of nominal aperture size 4 mm and

less should be of metal wire cloth; the recommended series of nominal aperture sizes is 4 mm, 2,8 mm,

2 mm, 1,4 mm, 1 mm, 710 μm, 500 μm, 355 μm, 250 μm, 180 μm, 125 μm, 90 μm, 63 μm and 45 μm.

© ISO 2015 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 1953:2015(E)

When a complete size analysis is required, it is preferable, subject to the range of sieve aperture sizes

available, that the mass of coal in any size fraction does not exceed 30 % of the total mass of sample

being sieved. The largest aperture size sieve should be that on which not more than 5 % mass fraction

of the sample is retained and the smallest aperture size sieve should be that through which not more

than 5 % mass fraction of the sample passes.

It is important to check the sieves from time to time, by the methods described in ISO 3310-1 and

ISO 3310-2, to ensure that the aperture dimensions are within the specified tolerances. Worn or

damaged sieves can give rise to serious errors in size analysis and should be discarded.

4.1.2 Receivers, for collecting material passing through the sieves.

4.1.3 Weighing scale, capable of measuring the mass of the sample to be sieved to the nearest 0,1 %.

4.1.4 Trays, smooth, of non-corrodible material, of at least 400 mm × 400 mm, depending on the mass

of sample and number of analysis required.
4.1.5 Watch- or clock-glasses.
4.2 For dry sieving
4.2.1 Lids, to fit the test sieves.
4.2.2 Flat brush, for cleaning the sieves and for brushing dust from the trays.

4.2.3 Hardwood block, about 150 mm long with a 10 mm × 10 mm cross-section, for tapping the sieves.

4.2.4 Shovel or scoop.
4.2.5 Vibratory sieve shaker for mechanical sieving.
4.3 For wet sieving
4.3.1 Pressure filter.
4.3.2 Buchner funnel and Buchner flask.
4.3.3 Filter paper.
4.3.4 Oven, capable of being controlled to ± 5 °C in the range 30 °C to 110 °C.
5 Sampling of test sample

The sample shall be taken in accordance with ISO 13909 or ISO 18283, subject to the following provision:

a) the number of increments and the increment masses, for both manual and mechanical sampling,

should comply with the requirements of ISO 13909 or ISO 18283.
b) the minimum mass of the gross sample should comply with Table 1.
2 © ISO 2015 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 1953:2015(E)
Table 1 — Minimum mass of sample for size analysis
Minimum mass for a Minimum mass for a
Nominal top size of coal
precision of 1 % precision of 2 %
mm kg kg
300 54 000 13 500
200 16 000 4 000
150 6 750 1 700
125 4 000 1 000
90 1 500 400
75 950 250
63 500 125
50 280 70
45 200 50
38 130 30
31,5 65 15
22,4 25 6
16,0 8 2
11,2 3 0,70
10,0 2 0,50
8,0 1 0,25
5,6 0,50 0,25
4,0 0,25 0,25
2,8 0,25 0,25
2,0 0,25 0,25
1,0 0,25 0,25
< 0,5 0,25 0,25
Preparation of test sample
5.1 General

Drying is necessary if the coal is wet and dry sieving is to be performed. The gross sample may be

divided if its mass greatly exceeds the value given in Table 1. If the gross sample is to be dried and

divided, the division shall be carried out first whenever practicable. If no preparation is necessary, the

test sample is the gross sample.
5.2 Drying

Air-dry the sample either at ambient temperature or at an elevated temperature not exceeding 40 °C.

Cool, if necessary, and allow the moisture content to come to equilibrium with the laboratory atmosphere.

If caking or swelling tests are to be carried out subsequently on the sample, the drying temperature

should not exceed 40 °C.
5.3 Division (other than wet coal of nominal top size less than 4 mm)

Divide the sample by means of a suitable mechanical sample divider or riffle avoiding size degradation

and loss of dust. For sample that contains larger pieces of particle size greater than say 50 mm, where

a suitable mechanical sample divider or riffle is not available, use either the flattened heap method,

© ISO 2015 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 1953:2015(E)

the strip mixing and splitting method described in ISO 13909-4 and ISO 18283. Weigh all the coal not

included as part of the test sample and retain it until all analyses and calculations are complete.

5.4 Division of wet coal of nominal top size less than 4 mm

Spread the gross sample on a clean flat surface, form into a cake 15 mm to 25 mm thick and extract a

2 kg sample by taking not less than 50 increments, evenly spread over the cake, using an appropriate

sampling scoop and bump plate. If further division is necessary, air-dry the divided sample first, as

described in 6.2 and then proceed as described in 6.3.
6 Procedure
6.1 General
The analysis shall be carried out by dry sieving (7.2) or by wet sieving (7.3).

In general, dry sieving is suitable for most types of coal but wet sieving should be used if particles tend

to agglomerate.

NOTE 1 A combination of wet sieving (to remove fine material) and dry sieving can be appropriate and an

example is given in Annex B.

NOTE 2 When sieving coals, wet sieving may produce different results compared to dry sieving because the

coals may contain percentages of clay and/or shales which may be soluble in water.

The range of sieves used will depend on the type of coal and the purpose of the test. For example, a

complete size analysis may be required for a run-of-mine coal or, in the simplest case, the amount of

undersize in a graded product may be required. If the results are to be presented graphically, the range

of sieves should comprise at least five different aperture sizes.

During sieving it may be convenient either to weigh separately each container with its size fraction and

to subtract the mass of the empty container or to weigh one container with the fraction corresponding

to the largest aperture size and to add successively all the other fractions, noting the cumulative

mass after each addition. The first technique is preferred for samples having a maximum particle size

of 4 mm, so that the end point of sieving may be checked. The second technique is normally used for

samples containing pieces having a particle size greater than 4 mm. However, if a detailed analysis of

the individual size fractions is required, it is essential to use the first technique.

A preliminary sieving on the smallest aperture size sieve is recommended when the sample contains a

large proportion of very fine material.
6.2 Dry sieving
6.2.1 Sample of maximum particle size greater than 22,4 mm
The following procedure applies:
a) Weigh the sample to be
...

SLOVENSKI STANDARD
SIST ISO 1953:2016
01-maj-2016
1DGRPHãþD
SIST ISO 1953:1998
ýUQLSUHPRJ'RORþDQMH]UQDWRVWLVVHMDOQRDQDOL]R
Hard coal - Size analysis by sieving
Houille - Analyse granulométrique par tamisage
Ta slovenski standard je istoveten z: ISO 1953:2015
ICS:
73.040 Premogi Coals
SIST ISO 1953:2016 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 1953:2016
---------------------- Page: 2 ----------------------
SIST ISO 1953:2016
INTERNATIONAL ISO
STANDARD 1953
Third edition
2015-11-15
Hard coal — Size analysis by sieving
Houille — Analyse granulométrique par tamisage
Reference number
ISO 1953:2015(E)
ISO 2015
---------------------- Page: 3 ----------------------
SIST ISO 1953:2016
ISO 1953:2015(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

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.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 1953:2016
ISO 1953:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Apparatus ..................................................................................................................................................................................................................... 1

4.1 For all methods ....................................................................................................................................................................................... 1

4.2 For dry sieving ......................................................................................................................................................................................... 2

4.3 For wet sieving ........................................................................................................................................................................................ 2

5 Sampling of test sample ................................................................................................................................................................................ 2

5.1 General ........................................................................................................................................................................................................... 3

5.2 Drying ............................................................................................................................................................................................................. 3

5.3 Division (other than wet coal of nominal top size less than 4 mm) .......................................................... 3

5.4 Division of wet coal of nominal top size less than 4 mm .................................................................................... 4

6 Procedure..................................................................................................................................................................................................................... 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Dry sieving .................................................................................................................................................................................................. 4

6.2.1 Sample of maximum particle size greater than 22,4 mm ............................................................. 4

6.2.2 Sample of maximum particle size between 4 mm and 22,4 mm—

manual method ................................................................................................................................................................. 5

6.2.3 Sample of maximum particle size less than 4 mm—manual method ................................ 5

6.2.4 Sample of maximum particle size between 4 mm and 22,4 mm; minus

4 mm—mechanical method ................................................................................................................................... 6

6.3 Wet sieving ................................................................................................................................................................................................. 6

7 Expression of results ........................................................................................................................................................................................ 7

7.1 Calculation .................................................................................................................................................................................................. 7

7.2 Graphical presentation ..................................................................................................................................................................... 7

8 Test report ................................................................................................................................................................................................................... 8

Annex A (informative) Guide to sampling ....................................................................................................................................................12

Annex B (informative) Example of removal by wet sieving of fine material from a sample

having a maximum particle size less than 4 mm .............................................................................................................13

© ISO 2015 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 1953:2016
ISO 1953:2015(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 1, Coal

preparation: Terminology and performance.

This third edition cancels and replaces the second edition (ISO 1953:1994), of which it constitutes a

minor revision.
iv © ISO 2015 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 1953:2016
ISO 1953:2015(E)
Introduction

Size analysis involves the separation of a sample of coal into size fractions having defined limits. In the

methods described in this International Standard the results are expressed in terms of the percentage

mass of coal remaining on sieves of different aperture sizes. This information can be of use in a number

of applications, including the following: assessing the yields of products from run-of-mine coals;

providing design data for coal preparation plants; checking that products from screening plants are

within the required limits; assessing the performance of coal-crushing plants; and selecting coals for

particular processes and equipment.
© ISO 2015 – All rights reserved v
---------------------- Page: 7 ----------------------
SIST ISO 1953:2016
---------------------- Page: 8 ----------------------
SIST ISO 1953:2016
INTERNATIONAL STANDARD ISO 1953:2015(E)
Hard coal — Size analysis by sieving
1 Scope

This International Standard specifies reference methods for the size analysis of coal by manual sieving

(wet or dry), using test sieves of aperture sizes between 125 mm and 45 μm. A guide to sampling is

given in Annex A.

This International Standard is applicable to all hard coals. It is not applicable to coke or other

manufactured fuels.

In the case of pulverized coal which has been ground so that a high proportion passes through the test

sieve of smallest aperture size, the methods described in this International Standard will determine

only the percentage oversize.
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 1213-1, Solid mineral fuels — Vocabulary — Part 1: Terms relating to coal preparation

ISO 1213-2, Solid mineral fuels — Vocabulary — Part 2: Terms relating to sampling, testing and analysis

ISO 13909 (all parts), Hard coal and coke — Mechanical sampling
ISO 18283, Hard coal and coke — Manual sampling

ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth

ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1213-1 and ISO 1213-2 apply.

4 Apparatus
4.1 For all methods

4.1.1 Test sieves, exclusively round-hole or exclusively square-hole, complying with ISO 3310-1 or

ISO 3310-2, as appropriate.

The recommended series of test sieves for general purposes is 125 mm, 90 mm, 75 mm, 63 mm, 50 mm,

45 mm, 31,5 mm, 22,4 mm, 16 mm, 11,2 mm, 8 mm, 5,6 mm, 4 mm, 2 mm and 1 mm nominal aperture

sizes, square-hole, or the same sizes of round-hole sieves. If this series is inadequate for the sizing of

graded coals, sieves from the supplementary sizes 100 mm, 80 mm, 40 mm, 25 mm, 20 mm, 12,5 mm,

10 mm and 6,3 mm may be included. For samples greater than 125 mm, single square-hole gauges of the

required dimensions may be used for the larger pieces. Test sieves of nominal aperture size 4 mm and

less should be of metal wire cloth; the recommended series of nominal aperture sizes is 4 mm, 2,8 mm,

2 mm, 1,4 mm, 1 mm, 710 μm, 500 μm, 355 μm, 250 μm, 180 μm, 125 μm, 90 μm, 63 μm and 45 μm.

© ISO 2015 – All rights reserved 1
---------------------- Page: 9 ----------------------
SIST ISO 1953:2016
ISO 1953:2015(E)

When a complete size analysis is required, it is preferable, subject to the range of sieve aperture sizes

available, that the mass of coal in any size fraction does not exceed 30 % of the total mass of sample

being sieved. The largest aperture size sieve should be that on which not more than 5 % mass fraction

of the sample is retained and the smallest aperture size sieve should be that through which not more

than 5 % mass fraction of the sample passes.

It is important to check the sieves from time to time, by the methods described in ISO 3310-1 and

ISO 3310-2, to ensure that the aperture dimensions are within the specified tolerances. Worn or

damaged sieves can give rise to serious errors in size analysis and should be discarded.

4.1.2 Receivers, for collecting material passing through the sieves.

4.1.3 Weighing scale, capable of measuring the mass of the sample to be sieved to the nearest 0,1 %.

4.1.4 Trays, smooth, of non-corrodible material, of at least 400 mm × 400 mm, depending on the mass

of sample and number of analysis required.
4.1.5 Watch- or clock-glasses.
4.2 For dry sieving
4.2.1 Lids, to fit the test sieves.
4.2.2 Flat brush, for cleaning the sieves and for brushing dust from the trays.

4.2.3 Hardwood block, about 150 mm long with a 10 mm × 10 mm cross-section, for tapping the sieves.

4.2.4 Shovel or scoop.
4.2.5 Vibratory sieve shaker for mechanical sieving.
4.3 For wet sieving
4.3.1 Pressure filter.
4.3.2 Buchner funnel and Buchner flask.
4.3.3 Filter paper.
4.3.4 Oven, capable of being controlled to ± 5 °C in the range 30 °C to 110 °C.
5 Sampling of test sample

The sample shall be taken in accordance with ISO 13909 or ISO 18283, subject to the following provision:

a) the number of increments and the increment masses, for both manual and mechanical sampling,

should comply with the requirements of ISO 13909 or ISO 18283.
b) the minimum mass of the gross sample should comply with Table 1.
2 © ISO 2015 – All rights reserved
---------------------- Page: 10 ----------------------
SIST ISO 1953:2016
ISO 1953:2015(E)
Table 1 — Minimum mass of sample for size analysis
Minimum mass for a Minimum mass for a
Nominal top size of coal
precision of 1 % precision of 2 %
mm kg kg
300 54 000 13 500
200 16 000 4 000
150 6 750 1 700
125 4 000 1 000
90 1 500 400
75 950 250
63 500 125
50 280 70
45 200 50
38 130 30
31,5 65 15
22,4 25 6
16,0 8 2
11,2 3 0,70
10,0 2 0,50
8,0 1 0,25
5,6 0,50 0,25
4,0 0,25 0,25
2,8 0,25 0,25
2,0 0,25 0,25
1,0 0,25 0,25
< 0,5 0,25 0,25
Preparation of test sample
5.1 General

Drying is necessary if the coal is wet and dry sieving is to be performed. The gross sample may be

divided if its mass greatly exceeds the value given in Table 1. If the gross sample is to be dried and

divided, the division shall be carried out first whenever practicable. If no preparation is necessary, the

test sample is the gross sample.
5.2 Drying

Air-dry the sample either at ambient temperature or at an elevated temperature not exceeding 40 °C.

Cool, if necessary, and allow the moisture content to come to equilibrium with the laboratory atmosphere.

If caking or swelling tests are to be carried out subsequently on the sample, the drying temperature

should not exceed 40 °C.
5.3 Division (other than wet coal of nominal top size less than 4 mm)

Divide the sample by means of a suitable mechanical sample divider or riffle avoiding size degradation

and loss of dust. For sample that contains larger pieces of particle size greater than say 50 mm, where

a suitable mechanical sample divider or riffle is not available, use either the flattened heap method,

© ISO 2015 – All rights reserved 3
---------------------- Page: 11 ----------------------
SIST ISO 1953:2016
ISO 1953:2015(E)

the strip mixing and splitting method described in ISO 13909-4 and ISO 18283. Weigh all the coal not

included as part of the test sample and retain it until all analyses and calculations are complete.

5.4 Division of wet coal of nominal top size less than 4 mm

Spread the gross sample on a clean flat surface, form into a cake 15 mm to 25 mm thick and extract a

2 kg sample by taking not less than 50 increments, evenly spread over the cake, using an appropriate

sampling scoop and bump plate. If further division is necessary, air-dry the divided sample first, as

described in 6.2 and then proceed as described in 6.3.
6 Procedure
6.1 General
The analysis shall be carried out by dry sieving (7.2) or by wet sieving (7.3).

In general, dry sieving is suitable for most types of coal but wet sieving should be used if particles tend

to agglomerate.

NOTE 1 A combination of wet sieving (to remove fine material) and dry sieving can be appropriate and an

example is given in Annex B.

NOTE 2 When sieving coals, wet sieving may produce different results compared to dry sieving because the

coals may contain percentages of clay and/or shales which may be soluble in water.

The range of sieves used will depend on the type of coal and the purpose of the test. For example, a

complete size analysis may be required for a run-of-mine coal or, in the simplest case, the amount of

undersize in a graded product may be required. If the results are to be presented graphically, the range

of sieves should comprise at least five different aperture sizes.

During sieving it may be convenient either to weigh separately each container with its size fraction and

to subtract the mass of the empty container or to weigh one container with the fraction corresponding

to the largest aperture size and to add successively all the other fractions, noting the cumulative

mass after each addition. The first technique is preferred for samples having a maximum particle size

of 4 mm, so that the end point of sieving may be checked. The second technique is normally used for

samples containing pieces having a particle size greater than 4 mm. Howe
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