ASTM D5341/D5341M-14
(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, 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D5341/D5341M − 14
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.
3
1. Scope Strength Test for Coke.”
1.1 This test method, patterned after the Nippon Steel test
3. Summary of Test Method
procedure, describes the equipment and techniques used for
3.1 A sample of dried coke of designated origin and size is
determining lump coke reactivity in carbon dioxide (CO ) gas
2
reacted with CO gas in a retort at a specified elevated
2
at elevated temperatures and its strength after reaction in CO
2
temperature for a specified length of time. Two indices, coke
gas by tumbling in a cylindrical chamber referred to as an
reactivity index (CRI) and coke strength after reaction (CSR),
I-tester.
are determined using the reacted coke residue. The weight loss
1.2 The values stated in either SI units or inch-pound units
after reaction determines the CRI. The weight retained after
are to be regarded separately as standard. The values stated in
sieving the tumbled reacted coke in a designated number of
each system may not be exact equivalents; therefore, each
revolutions over a designated turning rate determines the CSR.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
4. Significance and Use
with the standard.
4.1 When coke lumps descend in the blast furnace, they are
1.3 This standard does not purport to address all of the
subjected to reaction with countercurrent CO and to abrasion
2
safety concerns, if any, associated with its use. It is the
as they rub together and against the walls of the furnace.These
responsibility of the user of this standard to establish appro-
concurrent processes physically weaken and chemically react
priate safety and health practices and determine the applica-
with the coke lumps, producing an excess of fines that can
bility of regulatory limitations prior to use.
decrease burden permeability and result in increased coke rates
and lost hot metal production. This test method is designed to
2. Referenced Documents
measure indirectly this behavior of coke in the blast furnace.
2
2.1 ASTM Standards:
5. Apparatus
D346 Practice for Collection and Preparation of Coke
Samples for Laboratory Analysis
5.1 Electric Furnace (Fig. 1), capable of housing the reac-
E11 Specification for Woven Wire Test Sieve Cloth and Test
tion vessel assembly containing the coke sample and providing
Sieves
a uniform temperature of 1100 6 5°C in the assembly. Furnace
E691 Practice for Conducting an Interlaboratory Study to
dimensions do not impact the test results and may vary from
1 3
Determine the Precision of a Test Method
240 to 1035 mm [9 ⁄2 to 40 ⁄4 in.] in length and 76.2 to
1
88.9 mm [3 to 3 ⁄2 in.] in outside diameter. However, it is
2.2 British Carbonization Research Association Report:
preferable that the furnace have independently controlled
Carbonization Research Report 91, “The Evaluation of the
heating in three zones to achieve uniformity of heating in the
Nippon Steel Corporation Reactivity and Post-Reaction-
retort and that this control be achieved with a programmable
controller.
5.2 Reaction Vessel (Fig. 1), constructed of a heat-resistant
steel or nickel alloy to the dimensions required to fit snugly
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 inside the electric furnace selected for use (Note 1). The coke
Properties of Coal and Coke.
to be tested sits on a porous plate in the reaction vessel. Below
Current edition approved Sept. 1, 2014. Published September 2014. Originally
this porous plate, a gas preheater, such as a bed of ceramic
ε1
approved in 1993. Last previous edition approved in 2010 as D5341 – 99 (2010) .
Al O balls sitting on a second perforated plate, diffuse the
DOI: 10.1520/D5341_D5341M-14.
2 3
2
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from British Carbonization Research Association, Chesterfield,
the ASTM website. Derbyshire, England.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D5341/D5341M − 14
5.7 Coke Strength
...
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.
´1
Designation: D5341 − 99 (Reapproved 2010) D5341/D5341M − 14
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;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
ε NOTE—Added research report information to Section 11 editorially in September 2010.
1. Scope
1.1 This test method, patterned after the Nippon Steel test procedure, describes the equipment and techniques used for
determining lump coke reactivity in carbon dioxide (CO ) gas at elevated temperatures and its strength after reaction in CO gas
2 2
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 the standard. The values given in
parentheses are for information only. stated in each system may not be exact equivalents; therefore, each system shall be used
independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
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
2.2 British Carbonization Research Association Report:
Carbonization Research Report 91, “The Evaluation of the Nippon Steel Corporation Reactivity and Post-Reaction-Strength
3
Test for Coke.”
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 weight loss after reaction determines the CRI. The weight retained after sieving the tumbled
reacted coke in a designated number of revolutions over a designated turning rate determines the CSR.
4. Significance and Use
4.1 When coke lumps descend in the blast furnace, they are subjected to reaction with countercurrent CO and to abrasion as
2
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.
5. Apparatus
5.1 Electric Furnace (Fig. 1), capable of housing the reaction vessel assembly containing the coke sample and providing a
uniform temperature of 1100 6 5°C in the assembly. Furnace dimensions do not impact the test results and may vary from 240
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 May 1, 2010Sept. 1, 2014. Published May 2010September 2014. Originally approved in 1993. Last previous edition approved in 20042010 as
ε1
D5341 – 99 (2004).(2010) . DOI: 10.1520/D5341-99R10E01.10.1520/D5341_D5341M-14.
2
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.
3
Available from British Carbonization Research Association, Chesterfield, Derbyshire, England.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D5341/D5341M − 14
FIG. 1 Example of Reactivity Test Apparatus (Dimensions in mm)
1 3 1
to 1035 mm [9 ⁄2 to 40 ⁄4 in.] in length and 76.2 to 88.9 mm 88.9 mm [3 to 3 ⁄2 in.] in outside diameter. However, it is preferable
that th
...
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