GB/T 4000-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 4000-2017 | English | 145 |
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Determination of coke reactivity index (CRI) and coke strength after reaction (CSR)
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| GB/T 4000-2008 | English | 140 |
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Coke -- Determination of reactivity and strength after reaction
| Obsolete |
| GB/T 4000-1996 | English | 399 |
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Coke--Determination of reactivity and strength after reaction
| Obsolete |
| GB 4000-1983 | English | 279 |
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Coke--Determination of reactivity and strength after reaction
| Obsolete |
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GB/T 4000-2017: Determination of coke reactivity index (CRI) and coke strength after reaction (CSR)
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4000-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.160.10
H 32
Replacing GB/T 4000-2008
Determination of coke reactivity index (CRI)
and coke strength after reaction (CSR)
Issued on. OCTOBER 14, 2017
Implemented on. MAY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Principles... 4
4 Test instrument, equipment and materials... 4
5 Collection and preparation of specimen... 10
6 Test steps... 11
7 Calculation of results... 12
8 Precision... 13
Appendix A (Informative) Single-point temperature-measuring heating-furnace
... 14
Appendix B (Informative) Purification device of carbon dioxide and nitrogen gas
... 18
Appendix C (Informative) Rapid quantitative drying method for coke’s moisture
... 20
Appendix D (Normative) Test record... 22
Appendix E (Informative) Calibration method of constant-temperature zone of
electric furnace... 23
References... 25
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 4000-2008 “Determination of coke reactivity index
(CRI) and coke strength after reaction (CSR)”. As compared with GB/T 4000-
2008, the main technical changes of this standard are as follows.
- MODIFY the normative references;
- MODIFY the test instruments and materials;
- MODIFY the collection and preparation of specimen;
- MODIFY the test steps;
- MODIFY the requirements for precision;
- MODIFY the appendix D. Test record.
This standard was proposed by the China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Coal Chemical
Standardization Technical Committee Coking Chemistry Subcommittee
(SAC/TC 469/SC 3).
Drafting organizations of this standard. Kailuan Group Tangshan Zhongrun
Coal Chemical Co., Ltd., Anshan Kexiang Instrument and Meter Co., Ltd.,
Sinosteel Anshan Thermal Energy Research Institute Co., Ltd., Shaoxing
Shangyu Hongxing Machinery Instrument Manufacturing Co., Ltd., Zhejiang
Ford Machinery Manufacturing Co., Ltd. Co., Ltd., Wuhan Iron and Steel (Group)
Co., Ltd., Anshan Hansheng Metallurgical Equipment Co., Ltd., Metallurgical
Industry Information Standards Institute.
The main drafters of this standard. Zhang Jianmin, An Zhendong, Ren Xuegong,
Wang Qi, Zhang Dapeng, Zheng Jingxu, Cao Jiwen, Zhao Xiuyun, Dong Lirong,
Sun Chunkai, Xian Kuijuan, Li Dongtao, Zhang Guanlai, Fan Jinquan, Jin Hui,
Zhang Jingxi.
This standard replaces the standard previously issued as follows.
- GB 4000-1983, GB/T 4000-1996, GB/T 4000-2008.
Determination of coke reactivity index (CRI)
and coke strength after reaction (CSR)
1 Scope
This standard specifies the principles of test method, test instruments,
equipment and materials, collection and preparation of specimen, test
procedures, calculation of results, precision for determination of coke reactivity
and coke strength after reaction.
This standard is applicable to the determination of the reactivity and strength
after reaction of coke which is used in blast furnace ironmaking. The coke for
other purposes may refer to this standard
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 1997 Coke-sampling and preparation of specimens
YB/T 4494 Technical specifications for mechanical specimen preparation of
coke reactivity and coke strength after reaction
3 Principles
Weigh a certain amount of coke specimen. Place it in a reactor. After reacting
with carbon dioxide at 1100 °C for 2 h, use the percentage of the mass loss of
coke to represent the coke reactivity index (abbreviated as CRI).
4 Test instrument, equipment and materials
4.1 Electric furnace
Electric furnaces may be heated by electric furnace wire, silicon carbide or other
heating elements that can meet the test requirements.
4.2 Temperature-control device
4.2.1 Temperature-control requirements
The temperature-control device can display the upper, middle, lower
temperature of the specimen layer in real-time under the test state, ensure that
when the carbon dioxide reacts with the coke specimen, the temperature of the
gas entering the specimen layer as well as the temperature of the entire
specimen layer can be stabilized within the range of (1100 ± 3) °C.
4.2.2 Temperature-controller
4.2.3 Three-point thermocouple (see Figure 2 for schematic diagram)
Type-S, not lower than industrial grade-II, the thermocouple’s measurement
ends are located in the upper, middle, lower parts of the center of the specimen,
respectively.
4.3 Reactor (as shown in Figure 3)
4.3.1 Reaction tube’s material. GH3044.
4.3.2 Reaction tube’s wall-thickness. ≥ 1.5 mm.
4.4 Type-I drum (see Figure 4 for schematic diagram)
4.4.1 Constant rotation speed. 20 r/min.
4.4.2 Drum. It is made of seamless-steel tube which has an inner diameter of
130 mm and thickness of 5 mm ~ 6 mm. The net length inside the drum is 700
mm ± 1 mm, the thickness of the drum’s cover is 5 mm ~ 6 mm.
4.5 Carbon dioxide supply system
4.5.1 Carbon dioxide. purity ≥ 99.5%, dry, where the concentration of O2 shall
be < 0.01%.
4.5.2 Carbon dioxide’s mass-flow controller. the range is 5 L/min, the accuracy
is not less than ±1.5% F.S.
4.6 Nitrogen supply system
4.6.1 Pure nitrogen. purity ≥ 99.99%, dry.
4.6.2 Nitrogen’s mass-flow controller. the range is 5 L/min, the accuracy is not
less than ±1.5% F.S.
4.6.3 The air inlet of the equipment is equipped with the nitrogen pressure-
reducing valve.
5 Collection and preparation of specimen
5.1 According to the sampling method as specified in GB/T 1997, proportionally
take 60 kg of coke which is not less than 25 mm, completely discard the porous
coke which has large bubble and is in honeycomb status as well as the burner
coke which has blackhead and not completely gray.
5.2 Make the coke into approximately spherical particles of 23 mm ~ 25 mm.
The mechanical specimen preparation is carried out in accordance with the
requirements of YB/T 4494.
6 Test steps
6.1 Number of tests
Perform at least two tests. Record the quantity of coke particles per test, ensure
that the difference between the quantity of coke particles used in the
repeatability test and the reproducibility test is not more than one. If it cannot
guarantee meeting the requirements for the quantity of coke particles, indicate
it in the report and state the causes.
6.4 Temperature-rise
The electric furnace is heated up, at a heating rate of 8 °C/min ~ 16 °C/min.
When the temperature of the material layer reaches 400 °C, lead in nitrogen at
a flow rate of 0.8 L/min, to prevent the burn loss of coke. When the temperature
of the material layer reaches 1050 °C, preheat the outlet of the carbon dioxide
cylinder, to ensure stable outflow of carbon dioxide.
6.5 Cooling of specimen
Remove the reactor, reduce the temperature to below 100 ° C under nitrogen
protection, stop leading in nitrogen.
6.6 Weighing
Open the reactor, pour off the coke, weigh it, accurate to 0.1 g, record it as m1.
Meanwhile record the quantity of particles of specimen after reaction.
7 Calculation of results
7.1 Coke reactivity index
Coke reactivity index (CRI) is calculated according to formula (1), the value is
expressed in %.
8 Precision
The repeatability and reproducibility of coke reactivity index (CRI) and coke
strength after reaction (CSR) shall not exceed the values as specified in Table
1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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