ASTM D5341-99
(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)
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 SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety problems, 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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 5341 – 99
Standard Test Method for
Measuring Coke Reactivity Index (CRI) and Coke Strength
After Reaction (CSR)
This standard is issued under the fixed designation D 5341; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope temperature for a specified length of time. Two indices, coke
reactivity index (CRI) and coke strength after reaction (CSR),
1.1 This test method, patterned after the Nippon Steel test
are determined using the reacted coke residue. The weight loss
procedure, describes the equipment and techniques used for
after reaction determines the CRI. The weight retained after
determining lump coke reactivity in carbon dioxide (CO ) gas
sieving the tumbled reacted coke in a designated number of
at elevated temperatures and its strength after reaction in CO
revolutions over a designated turning rate determines the CSR.
gas by tumbling in a cylindrical chamber referred to as an
I-tester.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as the
4.1 When coke lumps descend in the blast furnace, they are
standard. The values given in parentheses are for information
subjected to reaction with countercurrent CO and to abrasion
only.
as they rub together and against the walls of the furnace. These
1.3 This standard does not purport to address all of the
concurrent processes physically weaken and chemically react
safety concerns, if any, associated with its use. It is the
with the coke lumps, producing an excess of fines that can
responsibility of the user of this standard to establish appro-
decrease burden permeability and result in increased coke rates
priate safety and health practices and determine the applica-
and lost hot metal production. This test method is designed to
bility of regulatory limitations prior to use.
measure indirectly this behavior of coke in the blast furnace.
2. Referenced Documents
5. Apparatus
2.1 ASTM Standards:
5.1 Electric Furnace (Fig. 1), capable of housing the
D 346 Practice for Collection and Preparation of Coke
2 reaction vessel assembly containing the coke sample and
Samples for Laboratory Analysis
providing a uniform temperature of 1100 6 5°C in the
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
3 assembly. Furnace dimensions do not impact the test results
poses
and may vary from 240 to 1035 mm in length and 76.2 to 88.9
E 691 Practice for Conducting an Interlaboratory Study to
3 mm in outside diameter. However, it is preferable that the
Determine the Precision of a Test Method
furnace have independently controlled heating in three zones to
2.2 British Carbonization Research Association Report:
achieve uniformity of heating in the retort and that this control
Carbonization Research Report 91, “The Evaluation of the
be achieved with a programmable controller.
Nippon Steel Corporation Reactivity and Post-Reaction-
4 5.2 Reaction Vessel (Fig. 1), constructed of a heat-resistant
Strength Test for Coke.”
steel or nickel alloy to the dimensions required to fit snugly
3. Summary of Test Method inside the electric furnace selected for use (Note 1). The coke
to be tested sits on a porous plate in the reaction vessel. Below
3.1 A sample of dried coke of designated origin and size is
this porous plate, a gas preheater, such as a bed of ceramic
reacted with CO gas in a retort at a specified elevated
Al O balls sitting on a second perforated plate, diffuse the
2 3
nitrogen (N ) and carbon dioxide introduced into the vessel up
This test method is under the jurisdiction of ASTM Committee D-5 on Coal and
through the coke bed during the course of the test. The gas
Coke and is the direct responsibility of Subcommittee D05.15 on Metalurgical
enters through inlets and exits through outlets varying from 6
Properties of Coal and Coke.
to 15 mm in inside diameter and positioned at the top and
Current edition approved Sept. 10, 1999. Published December 1999. Originally
published as D 5341 – 93. Last previous edition D 5341 – 93a.
bottom of the reaction vessel. During the test, it is important
Annual Book of ASTM Standards, Vol 05.06.
that no backpressure be detected when gas enters or exits
Annual Book of ASTM Standards, Vol 14.02.
through these inlets or outlets. The reaction vessel is positioned
Available from British Carbonization Research Association, Chesterfield,
such that the coke sample contained in the vessel on top of the
Derbyshire, England.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 5341
FIG. 2 Example of I-Type Coke Tumbler (Dimensions in mm)
FIG. 1 Example of Reactivity Test Apparatus (Dimensions in mm)
NOTE 3—Most Japanese publications refer to this as an I test.
600/10
ceramic Al O balls is in the center of the controlled tempera-
2 3
6. Sampling
ture zone in the furnace.
6.1 The gross sample of coke shall be collected in accor-
NOTE 1—Inconel 601 is recommended over stainless steel. Inconel 601
dance with Test Method D 346.
does not leave scale, that, if not properly removed, can alter a coke sample
6.2 For the standard procedure, the quantity must be not less
weight after the test.
than 57 kg (125 lbs).
5.3 Flowmeters—Rotometers or, preferably, mass flowme-
ters shall be used to monitor the amount of N and CO gases
2 2
7. Preparation of Sample
used in the test. The accuracy of measuring gas flowrates
7.1 Sieve the gross sample at 25.0 mm (1 in.) and discard
should be 61 % of full scale since varying gas flow can cause
the undersize.
variability in the test results. Gas pressures through the
7.2 With suitable crushing equipment, preferably a jaw or
flowmeters should be maintained at the manufacturer’s cali-
roll crusher, reduce the size of all of the remaining plus 25.0
bration specification.
mm (1 in.) to pass a 22.4-mm ( ⁄8-in.) sieve opening.
5.4 Thermocouple (Fig. 1), of the K, S, or R type normal-
7.3 Sieve the crushed sample using a 22.4-mm ( ⁄8-in.) sieve
ized at 20 to 21°C and enclosed in a heat-resistant steel or
placed on top of a 19.0-mm ( ⁄4-in.) sieve. Discard the minus
nickel alloy or ceramic protection tube placed in the center of
3 7
19.0-mm ( ⁄4-in.) coke, and retain the 22.4- by 19.0-mm ( ⁄8-by
the coke sample in the reaction vessel. A centering pipe or tube
⁄4-in.) fraction for testing.
also made of heat-resistant material is used to guide the
7.4 The size reduction of the plus 25.0 mm (1 in.) should be
thermocouple into its proper location in the coke bed.
accomplished in stages by recrushing any plus 22.4-mm
5.5 Sieves, used for sieving the coke during its preparation
( ⁄8-in.) coke remaining after each subsequent double sieving
for reactivity testing and after tumbling for strength after
step until there is no oversize retained on the 22.4-mm ( ⁄8-in.)
reaction testing. Square mesh sieves having 22.4-, 19.0-, and
sieve. The opening to the crusher should be set such that the
9.5-mm actual openings between the wires are to be used.
gross sample yields at least 10 % of 19.0- by 22.4-mm ( ⁄4-by
Standard test sieves that conform to Specification E 11 should
⁄8-in.) test coke (Note 4).
always be used.
5.6 Balance, capable of weighing up to 25 kg and sensitive
NOTE 4—The size of the sample required for most coke tests depends
to 0.1 g (0.000 22 lbs). on collecting sufficient received material to have sufficient natural sample
for testing, that is, stability 75.0 by 50.0 mm (3 by 2 in.). For the CSR
5.7 Coke Strength After Reaction Tumbler (Fig. 2), consist-
tests, most companies crush as-received coke to yield a 19.0- by 22.0-mm
ing of a cylindrical chamber with an internal length of 700 6
product. Therefore, 57 kg (125 lbs) of gross sample is not necessarily
10 mm and an internal diameter 130 6 5 mm, with end caps of
required. In fact, Nippon Steel Corporation, the o
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.