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GB/T 24237-2025: Iron ore pellets for shaft direct-reduction feedstocks - Determination of the clustering index
Status: Valid GB/T 24237: Evolution and historical versions
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| GB/T 24237-2025 | English | 324 |
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Iron ore pellets for shaft direct-reduction feedstocks - Determination of the clustering index
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GB/T 24237-2025
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| GB/T 24237-2009 | English | 234 |
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Iron ore pellets for shaft direct-reduction feedstocks -- Determination of the clustering index
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GB/T 24237-2009
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PDF similar to GB/T 24237-2025
Basic data | Standard ID | GB/T 24237-2025 (GB/T24237-2025) | | Description (Translated English) | Iron ore pellets for shaft direct-reduction feedstocks - Determination of the clustering index | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D31 | | Classification of International Standard | 73.060.10 | | Word Count Estimation | 16,117 | | Date of Issue | 2025-06-30 | | Date of Implementation | 2026-01-01 | | Older Standard (superseded by this standard) | GB/T 24237-2009 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 24237-2025: Iron ore pellets for shaft direct-reduction feedstocks - Determination of the clustering index
---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/GBT24237-2025
ICS 73.060.10
CCSD31
National Standard of the People's Republic of China
Replaces GB/T 24237-2009
Iron ore pellets for direct reduction furnace charge
Determination of clumping index
(ISO 11256.2015, IDT)
Released on June 30, 2025
Implementation on January 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Principle 1
5 Sampling, sample preparation and test sample preparation 2
5.1 Sampling and sample preparation 2
5.2 Preparation of test samples 2
6 devices 2
6.1 General Principles 2
6.2 Reduction reaction tube 3
6.3 Loading device 4
6.4 Porcelain Ball 4
6.5 Heating furnace 5
6.6 Balance 5
6.7 Gas supply system 5
6.8 Drum 5
6.9 Drum power equipment 6
6.10 Weighing equipment 6
7 Test conditions 6
7.1 General Conditions 6
7.2 Reducing gas 6
7.3 Heating and cooling gases 6
7.4 Test sample temperature 6
7.5 Test sample load 6
8 Test Step 7
8.1 Number of test measurements 7
8.2 Chemical analysis 7
8.3 Restore 7
8.4 Dispersion Operation 7
9 Results Presentation 8
9.1 Calculation of the Agglomeration Index (CI) 8
9.2 Repeatability and acceptability of test results 8
10 Test Report 8
11 Check 8
Appendix A (Normative) Test Result Acceptance Flowchart 10
Appendix B (Informative) Clustering Index Calculation Example 11
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 24237-2009 "Determination of agglomeration properties of iron ore pellets for direct reduction furnace charge" and is in line with GB/T 24237-
Compared with.2009, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope has been changed (see Chapter 1, Chapter 1 of the.2009 edition);
b) Part of the statement of the principle has been changed (see Chapter 4, Chapter 4 of the.2009 edition);
c) The requirements for heating furnaces have been changed (see 6.5, 6.5 of the.2009 edition);
d) The requirements for rotating drums have been changed (see 6.8, 6.8 of the.2009 edition);
e) The requirements for drum power equipment have been changed (see 6.9, 6.9 of the.2009 edition);
f) Change “GB/T 6730.5 Determination of total iron content (w2)” to “ISO 2597-2 Determination of total iron content (w2)” (see 8.2 and 8.3,
8.2 and 8.3 of the.2009 edition);
g) Added the test step of “tare the balance and start the timer” (see 8.3);
h) Added the record requirements for test results (see 9.1).
This document is equivalent to ISO 11256.2015 "Iron ore pellets for direct reduction furnace charge - Determination of agglomeration index".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Iron Ore and Direct Reduced Iron (SAC/TC317).
This document was drafted by. Baoshan Iron & Steel Co., Ltd., Shaoxing Shangyu Hongxing Machinery and Instrument Manufacturing Co., Ltd., China Certification and Inspection
Group Hebei Co., Ltd., Anshan Kexiang Instrument Co., Ltd., Shanghai Customs Industrial Products and Raw Materials Testing Technology Center, Metallurgical Industry
Standards Information Institute.
The main drafters of this document are. Wang Chunsheng, Chen Xiaoqi, Jin Jianhua, Zhang Guanlai, Wang Gang, Chen Hailan, Kang Xiping, Chen Jin, Chu Yongjun, Zhang Dapeng,
Wu Yiqing, Wang Bing, Chen Zibin, and Zhang Chen.
This document was first published in.2009 and this is the first revision.
Iron ore pellets for direct reduction furnace charge
Determination of clumping index
WARNING. This document may involve hazardous procedures and equipment. This document does not purport to address all safety concerns associated with its use.
It is the responsibility of the user of this document to establish appropriate safety and health precautions and determine the applicability of regulatory requirements prior to use.
1 Scope
This document specifies the relative measurement of agglomeration formation of iron ore pellets during the reduction process under conditions simulating the shaft furnace direct reduction process.
Determine the method.
This document applies to thermally bonded pellets.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
ISO 2597-1 Iron ores - Determination of total iron content - Part 1.Tin dichloride reduction titration method
Note. GB/T 6730.70-2013 Iron ore - Determination of total iron content - Stannous chloride reduction titration method (ISO 2597-1.2006, MOD)
ISO 2597-2 Iron ores - Determination of total iron content - Part 2.Titanium trichloride reduction titration method
Note. GB/T 6730.5-2022 Iron ore—Determination of total iron content—Titanium trichloride reduction titration method (ISO 2597-2.2019, MOD)
Note. GB/T 10322.1-2023 Iron ore sampling and sample preparation methods (ISO 3082.2017, IDT)
ISO 9035 Iron ores - Determination of acid-soluble iron content - Titration
(II)content-Titrimetricmethod]
Note. GB/T 6730.71-2014 Iron ore—Determination of ferrous iron content—Acid-soluble titrimetric method (ISO 9035.1989, MOD)
Note. GB/T 20565-2022 Terminology for iron ore and direct reduced iron (ISO 11323.2010, IDT)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in ISO 11323 apply.
4 Principles
In a fixed bed at 850℃, a reducing gas consisting of hydrogen (H2), carbon monoxide (CO), carbon dioxide (CO2) and nitrogen (N2) is used.
The body is subjected to isothermal reduction test under static load until the reduction degree reaches 95%. The clumped test sample is dispersed by rotating the drum.
After the prescribed dispersion operation is completed, the agglomeration index is calculated from the cumulative mass of the pellets that are still agglomerated.
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