ASTM D5341/D5341M-18
(Test Method)Standard Test Method for Measuring Coke Reactivity Index (CRI) and Coke Strength After Reaction (CSR)
Standard Test Method for Measuring Coke Reactivity Index (CRI) and Coke Strength After Reaction (CSR)
SIGNIFICANCE AND USE
4.1 When coke lumps descend in the blast furnace, they are subjected to reaction with countercurrent CO2 and to abrasion as they rub together and against the walls of the furnace. These concurrent processes physically weaken and chemically react with the coke lumps, producing an excess of fines that can decrease burden permeability and result in increased coke rates and lost hot metal production. This test method is designed to measure indirectly this behavior of coke in the blast furnace.
SCOPE
1.1 This test method, patterned after the Nippon Steel test procedure (see Carbonization Research Report 91 and Nishi et al.2), describes the equipment and techniques used for determining lump coke reactivity in carbon dioxide (CO2) gas at elevated temperatures and its strength after reaction in CO2 gas by tumbling in a cylindrical chamber referred to as an I-tester.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: D5341/D5341M − 18
Standard Test Method for
Measuring Coke Reactivity Index (CRI) and Coke Strength
1
After Reaction (CSR)
This standard is issued under the fixed designation D5341/D5341M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method, patterned after the Nippon Steel test
4
2.2 British Carbonization Research Association Report:
procedure (see Carbonization Research Report 91 and Nishi et
2
al. ), describes the equipment and techniques used for deter- Carbonization Research Report 91, “The Evaluation of the
Nippon Steel Corporation Reactivity and Post-Reaction-
mining lump coke reactivity in carbon dioxide (CO ) gas at
2
elevated temperatures and its strength after reaction in CO gas Strength Test for Coke.”
2
5
by tumbling in a cylindrical chamber referred to as an I-tester.
2.3 ISO Standard:
ISO 5725 - 6: 1994 Accuracy of Measurement Methods and
1.2 The values stated in either SI units or inch-pound units
Results – Part 6: Use in Practice of Accuracy Values
are to be regarded separately as standard. The values stated in
each system are not necessarily exact equivalents; therefore, to
3. Summary of Test Method
ensure conformance with the standard, each system shall be
used independently of the other, and values from the two
3.1 A sample of dried coke of designated origin and size is
systems shall not be combined.
reacted with CO gas in a retort at a specified elevated
2
1.3 This standard does not purport to address all of the temperature for a specified length of time. Two indices, coke
reactivity index (CRI) and coke strength after reaction (CSR),
safety concerns, if any, associated with its use. It is the
are determined using the reacted coke residue. The mass or
responsibility of the user of this standard to establish appro-
weight loss after reaction determines the CRI. The mass or
priate safety, health, and environmental practices and deter-
weight retained after sieving the tumbled reacted coke in a
mine the applicability of regulatory limitations prior to use.
designated number of revolutions over a designated turning
1.4 This international standard was developed in accor-
rate determines the CSR.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Significance and Use
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4.1 When coke lumps descend in the blast furnace, they are
Barriers to Trade (TBT) Committee.
subjected to reaction with countercurrent CO and to abrasion
2
as they rub together and against the walls of the furnace.These
2. Referenced Documents
concurrent processes physically weaken and chemically react
3
2.1 ASTM Standards:
with the coke lumps, producing an excess of fines that can
D346 Practice for Collection and Preparation of Coke
decrease burden permeability and result in increased coke rates
Samples for Laboratory Analysis
and lost hot metal production. This test method is designed to
E11 Specification for Woven Wire Test Sieve Cloth and Test
measure indirectly this behavior of coke in the blast furnace.
Sieves
5. Reagents
1
This test method is under the jurisdiction of ASTM Committee D05 on Coal
5.1 Nitrogen, with purity greater than 99.9 % by volume,
and Coke and is the direct responsibility of Subcommittee D05.15 on Metallurgical
dryandwithtotaloxygenandcarbondioxideconcentrationsof
Properties of Coal and Coke.
less than 100 mg/kg.
Current edition approved Dec. 1, 2018. Published January 2019. Originally
approvedin1993.Lastpreviouseditionapprovedin2017asD5341/D5341M – 17a.
DOI: 10.1520/D5341_D5341M-18.
2
Nishi, T., et al., Journal of the Fuel Society of Japan, Vol 61, No. 668, 1982,
4
pp. 1066-1073. Available from British Carbonization Research Association, Chesterfield,
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Derbyshire, England.
5
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Organization for Standardization (ISO), ISO
Standards volume information, refer to the standard’s Document Summary page on Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
the ASTM website. Geneva, Switzerland, http://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D534
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5341/D5341M − 17a D5341/D5341M − 18
Standard Test Method for
Measuring Coke Reactivity Index (CRI) and Coke Strength
1
After Reaction (CSR)
This standard is issued under the fixed designation D5341/D5341M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method, patterned after the Nippon Steel test procedure, procedure (see Carbonization Research Report 91 and
2
Nishi et al. ), describes the equipment and techniques used for determining lump coke reactivity in carbon dioxide (CO ) gas at
2
elevated temperatures and its strength after reaction in CO gas by tumbling in a cylindrical chamber referred to as an I-tester.
2
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
D346 Practice for Collection and Preparation of Coke Samples for Laboratory Analysis
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
4
2.2 British Carbonization Research Association Report:
Carbonization Research Report 91, “The Evaluation of the Nippon Steel Corporation Reactivity and Post-Reaction-Strength
Test for Coke.”
5
2.3 ISO Standard:
ISO 5725 - 6: 1994 Accuracy of Measurement Methods and Results – Part 6: Use in Practice of Accuracy Values
3. Summary of Test Method
3.1 A sample of dried coke of designated origin and size is reacted with CO gas in a retort at a specified elevated temperature
2
for a specified length of time. Two indices, coke reactivity index (CRI) and coke strength after reaction (CSR), are determined
using the reacted coke residue. The mass or weight loss after reaction determines the CRI. The mass or weight retained after sieving
the tumbled reacted coke in a designated number of revolutions over a designated turning rate determines the CSR.
1
This test method is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.15 on Metallurgical Properties
of Coal and Coke.
Current edition approved Nov. 1, 2017Dec. 1, 2018. Published November 2017January 2019. Originally approved in 1993. Last previous edition approved in 2017 as
D5341 – 17.D5341/D5341M – 17a. DOI: 10.1520/D5341_D5341M-17A.10.1520/D5341_D5341M-18.
2
Nishi, T., et al., Journal of the Fuel Society of Japan, Vol 61, No. 668, 1982, pp. 1066-1073.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
Available from British Carbonization Research Association, Chesterfield, Derbyshire, England.
5
Nishi, T., et al,Available from International Organization Journal of the Fuel Society of Japan,for Standardization (ISO), ISO Central Secretariat, BIBC Vol 61, No 668,
1982, pp 1066-1073.II, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva, Switzerland, http://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D5341/D5341M − 18
4. Significance and Use
4.1 When coke lumps descend in the blast furnace, they are subjected to reaction with countercurren
...
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