Coal - Determination of caking power - Gray-King coke test

This International Standard specifies a method of assessing the caking power of coal under standard
conditions.

Charbon - Détermination du pouvoir agglutinant - Essai Gray-King

Premog - Ugotavljanje sposobnosti koksanja - Gray-Kingov preskus

Ta mednarodni standard določa metodo za ugotavljanje sposobnosti koksanja premoga v standardnih pogojih.

General Information

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

RELATIONS

Buy Standard

Standard
ISO 502:2015 - Coal -- Determination of caking power -- Gray-King coke test
English language
13 pages
sale 15% off
Preview
sale 15% off
Preview
Standard
SIST ISO 502:2016
English language
18 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 502
Third edition
2015-06-15
Coal — Determination of caking power
— Gray-King coke test
Charbon — Détermination du pouvoir agglutinant — Essai Gray-King
Reference number
ISO 502:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 502:2015(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 502:2015(E)
Contents Page

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

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

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

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

3 Principle ........................................................................................................................................................................................................................ 1

4 Reagent ........................................................................................................................................................................................................................... 1

4.1 Standard electrode carbon (see 10.1) ................................................................................................................................. 1

5 Apparatus ..................................................................................................................................................................................................................... 2

6 Preparation of sample .................................................................................................................................................................................... 2

7 Procedure..................................................................................................................................................................................................................... 3

7.1 Coals with a Gray-King coke type within the range A to G (see 10.3) ................................................... 3

7.2 Coals with a Gray-King coke type greater than G (see 10.3) ......................................................................... 3

8 Expression of results ........................................................................................................................................................................................ 3

9 Precision of the method ................................................................................................................................................................................ 3

9.1 General ........................................................................................................................................................................................................... 3

9.2 Repeatability ............................................................................................................................................................................................. 4

9.3 Reproducibility ....................................................................................................................................................................................... 4

10 Notes on procedure ............................................................................................................................................................................................ 4

11 Test report ................................................................................................................................................................................................................... 5

Annex A (normative) Determination of the bulk density of electrode carbon ......................................................11

© ISO 2015 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 502:2015(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 05,

Methods of analysis.

This third edition cancels and replaces the second edition (ISO 502:1982), which has been technically

revised.
iv © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 502:2015(E)
Introduction

The purpose of the Gray-King coke test, which is one of the parameters adopted for the International

Classification of Hard Coal by Type by the United Nations Economic Commission for Europe, is to assess

the caking properties of a type of coal or a blend of coals by carbonizing under standard conditions.

Although the Gray-King test and the Roga test both assess the caking properties of a coal, they do

not measure precisely the same parameters and are not recommended to be regarded as alternative

methods.
© ISO 2015 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 502:2015(E)
Coal — Determination of caking power — Gray-King coke
test
1 Scope

This International Standard specifies a method of assessing the caking power of coal under standard

conditions.
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 1014, Coke — Determination of true relative density, apparent relative density and porosity

3 Principle

The sample is heated under standard conditions to a final temperature of 600 °C. The coke residue

obtained is classified by reference to a series of standard residues. If the coke residue produced is so

swollen that it fills the cross-section of the retort tube, the determination is repeated with the coal

admixed with a suitable quantity of electrode carbon or equivalent material. For these highly swelling

coals, the Gray-King coke type is defined by the minimum amount of electrode carbon required to

produce a strong hard coke residue of the same volume as the original coal and electrode carbon mixture.

4 Reagent
4.1 Standard electrode carbon (see 10.1)
High temperature electrode carbon:
Moisture less than 1 %
Volatile matter less than 1,5 %
Ash less than 5 %
3 3
Bulk density at 25 °C (see Annex A) 1,00 g/cm to 1,05 g/cm
Relative density at 25 °C (see 10.2) 2,05 to 2,09
Size analysis:
Retained on 212 μm test sieve nil
Through 212 μm test sieve, retained on 125 μm test sieve less than 26 %
Through 125 μm test sieve, retained on 63 μm test sieve 10 % to 40 %
Through 63 μm test sieve 50 % to 85 %
© ISO 2015 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 502:2015(E)

It is recommended that a dust mask is used while using the inert carbonaceous material which can

contain undesirable trace elements from the original processing of this material.

5 Apparatus

5.1 Furnace, horizontal electric, 50 mm internal diameter and 300 mm long, with one end closed and

the other carrying a plug of insulating material which is bored centrally with a hole 25 mm in diameter.

The winding of the furnace shall be such that the middle 200 mm is at a uniform temperature within ±5 °C

at both 300 °C and 600 °C. Alternatively, the furnace may be constructed from an electrically-heated

aluminium-bronze block, with one or several, bores of 25 mm diameter. The furnace shall be insulated and

located in a cover of metal or other suitable material, and shall be equipped with a suitable thermocouple,

lying above the retort tube when the latter is in position and with the junction at the centre of the furnace.

An indicator shall be provided for showing the furnace temperature with an accuracy of ±5 °C. A suitable

means of controlling the energy input shall also be provided to permit an increase in temperature at a rate

of 5 °C/min. A multiple tube furnace to allow simultaneous determinations is convenient. The furnace

may be of the fixed type or mounted on rails. Suitable furnaces are shown in Figure 2 and Figure 3.

5.2 Retort tube (see Figure 4), a heat-resistant glass or transparent silica tube, 20 mm internal diameter

and 300 mm long, closed at one end, with a side arm, 8 mm internal diameter and 50 mm long, sealed in

at a distance of about 20 mm from the open end. The tube shall be smooth and either of uniform bore or

with a slight taper (19 mm to 21 mm) such that the open end is the larger.

5.3 Distance rod, with a flat disk at one end to assist in the packing of the coal and to indicate the free

end of the coal sample in the retort tube.
5.4 Receiver and outlet tube

A glass vessel of adequate size, suitably supported and attached to the side arm of the retort tube, fitted

with an outlet tube leading to atmosphere or to a piece of small bore silica tubing at the end of which the

gas leaving the receiver can be burned through Bunsen burner (in a fume cabinet) to ensure toxic fumes

are burnt before venting to the atmosphere through the fume cabinet.
The receiver may conveniently be a U-tube which can be immersed in water.
The outlet shall be open to the atmosphere to prevent pressure build-up.

Fumes are toxic and it is recommended that the process is carried out in a fume cupboard.

The tar receiver should be clea
...

SLOVENSKI STANDARD
SIST ISO 502:2016
01-maj-2016
1DGRPHãþD
SIST ISO 502:1998
Premog - Ugotavljanje sposobnosti koksanja - Gray-Kingov preskus
Coal - Determination of caking power - Gray-King coke test
Charbon - Détermination du pouvoir agglutinant - Essai Gray-King
Ta slovenski standard je istoveten z: ISO 502:2015
ICS:
73.040 Premogi Coals
SIST ISO 502:2016 en

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

---------------------- Page: 1 ----------------------
SIST ISO 502:2016
---------------------- Page: 2 ----------------------
SIST ISO 502:2016
INTERNATIONAL ISO
STANDARD 502
Third edition
2015-06-15
Coal — Determination of caking power
— Gray-King coke test
Charbon — Détermination du pouvoir agglutinant — Essai Gray-King
Reference number
ISO 502:2015(E)
ISO 2015
---------------------- Page: 3 ----------------------
SIST ISO 502:2016
ISO 502:2015(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 502:2016
ISO 502:2015(E)
Contents Page

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

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

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

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

3 Principle ........................................................................................................................................................................................................................ 1

4 Reagent ........................................................................................................................................................................................................................... 1

4.1 Standard electrode carbon (see 10.1) ................................................................................................................................. 1

5 Apparatus ..................................................................................................................................................................................................................... 2

6 Preparation of sample .................................................................................................................................................................................... 2

7 Procedure..................................................................................................................................................................................................................... 3

7.1 Coals with a Gray-King coke type within the range A to G (see 10.3) ................................................... 3

7.2 Coals with a Gray-King coke type greater than G (see 10.3) ......................................................................... 3

8 Expression of results ........................................................................................................................................................................................ 3

9 Precision of the method ................................................................................................................................................................................ 3

9.1 General ........................................................................................................................................................................................................... 3

9.2 Repeatability ............................................................................................................................................................................................. 4

9.3 Reproducibility ....................................................................................................................................................................................... 4

10 Notes on procedure ............................................................................................................................................................................................ 4

11 Test report ................................................................................................................................................................................................................... 5

Annex A (normative) Determination of the bulk density of electrode carbon ......................................................11

© ISO 2015 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 502:2016
ISO 502:2015(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 05,

Methods of analysis.

This third edition cancels and replaces the second edition (ISO 502:1982), which has been technically

revised.
iv © ISO 2015 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 502:2016
ISO 502:2015(E)
Introduction

The purpose of the Gray-King coke test, which is one of the parameters adopted for the International

Classification of Hard Coal by Type by the United Nations Economic Commission for Europe, is to assess

the caking properties of a type of coal or a blend of coals by carbonizing under standard conditions.

Although the Gray-King test and the Roga test both assess the caking properties of a coal, they do

not measure precisely the same parameters and are not recommended to be regarded as alternative

methods.
© ISO 2015 – All rights reserved v
---------------------- Page: 7 ----------------------
SIST ISO 502:2016
---------------------- Page: 8 ----------------------
SIST ISO 502:2016
INTERNATIONAL STANDARD ISO 502:2015(E)
Coal — Determination of caking power — Gray-King coke
test
1 Scope

This International Standard specifies a method of assessing the caking power of coal under standard

conditions.
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 1014, Coke — Determination of true relative density, apparent relative density and porosity

3 Principle

The sample is heated under standard conditions to a final temperature of 600 °C. The coke residue

obtained is classified by reference to a series of standard residues. If the coke residue produced is so

swollen that it fills the cross-section of the retort tube, the determination is repeated with the coal

admixed with a suitable quantity of electrode carbon or equivalent material. For these highly swelling

coals, the Gray-King coke type is defined by the minimum amount of electrode carbon required to

produce a strong hard coke residue of the same volume as the original coal and electrode carbon mixture.

4 Reagent
4.1 Standard electrode carbon (see 10.1)
High temperature electrode carbon:
Moisture less than 1 %
Volatile matter less than 1,5 %
Ash less than 5 %
3 3
Bulk density at 25 °C (see Annex A) 1,00 g/cm to 1,05 g/cm
Relative density at 25 °C (see 10.2) 2,05 to 2,09
Size analysis:
Retained on 212 μm test sieve nil
Through 212 μm test sieve, retained on 125 μm test sieve less than 26 %
Through 125 μm test sieve, retained on 63 μm test sieve 10 % to 40 %
Through 63 μm test sieve 50 % to 85 %
© ISO 2015 – All rights reserved 1
---------------------- Page: 9 ----------------------
SIST ISO 502:2016
ISO 502:2015(E)

It is recommended that a dust mask is used while using the inert carbonaceous material which can

contain undesirable trace elements from the original processing of this material.

5 Apparatus

5.1 Furnace, horizontal electric, 50 mm internal diameter and 300 mm long, with one end closed and

the other carrying a plug of insulating material which is bored centrally with a hole 25 mm in diameter.

The winding of the furnace shall be such that the middle 200 mm is at a uniform temperature within ±5 °C

at both 300 °C and 600 °C. Alternatively, the furnace may be constructed from an electrically-heated

aluminium-bronze block, with one or several, bores of 25 mm diameter. The furnace shall be insulated and

located in a cover of metal or other suitable material, and shall be equipped with a suitable thermocouple,

lying above the retort tube when the latter is in position and with the junction at the centre of the furnace.

An indicator shall be provided for showing the furnace temperature with an accuracy of ±5 °C. A suitable

means of controlling the energy input shall also be provided to permit an increase in temperature at a rate

of 5 °C/min. A multiple tube furnace to allow simultaneous determinations is convenient. The furnace

may be of the fixed type or mounted on rails. Suitable furnaces are shown in Figure 2 and Figure 3.

5.2 Retort tube (see Figure 4), a heat-resistant glass or transparent silica tube, 20 mm internal diameter

and 300 mm long, closed at one end, with a side arm, 8 mm internal diameter and 50 mm long, sealed in

at a distance of about 20 mm from the open end. The tube shall be smooth and either of uniform bore or

with a slight taper (19 mm to 21 mm) such that the open end is the larger.

5.3 Distance rod, with a flat disk at one end to assist in the packing of the coal and to indicate the free

end of the coal sample in the retort tube.
5.4 Receiver and outlet tube

A glass vessel of adequate size, suitably supported and attached to the side arm of the retort tube, fitted

with an outlet tube leading to atmosphere or to a piece of small bore silica tubing at the end of which the

gas leaving the receiver can be burned through Bunsen burner (in a f
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.