Brown coals and lignites -- Determination of the volatile matter in the analysis sample

This document specifies a method of determining the volatile matter of brown coals and lignites.

Charbons bruns et lignites -- Détermination des matières volatiles dans l'échantillon pour analyse

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Status
Published
Publication Date
08-Dec-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
11-Nov-2021
Completion Date
10-Nov-2021
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ISO 5071-1:2021 - Brown coals and lignites -- Determination of the volatile matter in the analysis sample
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INTERNATIONAL ISO
STANDARD 5071-1
Third edition
2021-12
Brown coals and lignites —
Determination of the volatile matter
in the analysis sample —
Part 1:
Two-furnace method
Charbons bruns et lignites — Détermination des matières volatiles
dans l'échantillon pour analyse —
Partie 1: Méthode avec utilisation de deux fours
Reference number
ISO 5071-1:2021(E)
© ISO 2021
---------------------- Page: 1 ----------------------
ISO 5071-1:2021(E)
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© ISO 2021 – All rights reserved
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ISO 5071-1:2021(E)
Contents Page

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

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 1

5 Reagents ........................................................................................................................................................................................................................ 1

6 Apparatus .................................................................................................................................................................................................................... 2

7 Sample ............................................................................................................................................................................................................................. 6

8 Procedure ....................................................................................................................................................................................................................6

8.1 Preliminary procedure ................................................................................................................................................................... 6

8.2 Predetermination procedure..................................................................................................................................................... 6

8.3 Method using oven-dried coal .................................................................................................................................................. 6

8.4 Method using air-dried coal ....................................................................................................................................................... 6

9 Calculation and expression of results ........................................................................................................................................... 7

9.1 For oven-dried coal ............................................................................................................................................................................. 7

9.2 For air-dried coal .................................................................................................................................................................................. 7

10 Precision ....................................................................................................................................................................................................................... 8

10.1 Repeatability limit ............................................................................................................................................................................... 8

10.2 Reproducibility limit ......................................................................................................................................................................... 8

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

iii
© ISO 2021 – All rights reserved
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ISO 5071-1:2021(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

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).

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www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 27, Coal and coke, Subcommittee SC 5,

Methods of analysis.

This third edition cancels and replaces the second edition (ISO 5071-1:2013), of which it constitutes a

minor revision. The changes compared to the previous edition are as follows:
— referenced documents have been updated;
— terms and definitions have been added;
— sample has been added;
— calculation and expression of results have been amended;
— precision has been amended;
— test report has been amended.

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.
© ISO 2021 – All rights reserved
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ISO 5071-1:2021(E)
Introduction

The volatile matter is determined as the loss in mass, corrected for moisture, when an analysis sample

of brown coal or lignite is heated out of contact with air under specified conditions. The test is empirical

and, in order to obtain reproducible results, it is essential that the rate of heating, the final temperature

and the overall duration of the test be carefully controlled. Due to the nature of brown coals and

lignites, initial heating of the sample at 400 °C is necessary to minimize the possibility of ejection of

sample from the test crucible.

Mineral matter associated with the sample may also lose mass under the conditions of the test, the

magnitude of the loss being dependent on both the nature and the quantity of the minerals present.

© ISO 2021 – All rights reserved
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INTERNATIONAL STANDARD ISO 5071-1:2021(E)
Brown coals and lignites — Determination of the volatile
matter in the analysis sample —
Part 1:
Two-furnace method
1 Scope

This document specifies a method of determining the volatile matter of brown coals and lignites.

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 1170, Coal and coke — Calculation of analyses to different bases

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

ISO 5068-2, Brown coals and lignites — Determination of moisture content — Part 2: Indirect gravimetric

method for moisture in the analysis sample

ISO 13909-4, Hard coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples

ISO 18283, Coal and coke — Manual sampling
3 Terms and definitions

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

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 https:// www .electropedia .org/
4 Principle

The coal is heated out of contact with air for 7 min at 400 °C, then immediately transferred to another

furnace and heated at 900 °C for a further 7 min. The volatile matter mass fraction is calculated from

the loss in mass of the oven-dried sample or from the loss in mass of the analysis sample corrected for

moisture.
5 Reagents

5.1 Desiccants, fresh or freshly regenerated and preferably self-indicating. Suitable desiccants are

magnesium perchlorate, silica gel, activated alumina and anhydrous calcium sulfate.

WARNING — Magnesium perchlorate is a strong oxidizing agent. Do not attempt to regenerate

the absorbent. Do not permit contact with organic materials or reducing agent.
© ISO 2021 – All
...

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