GB/T 6730.61-2022 PDF English
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| GB/T 6730.61-2022 | English | 260 |
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Iron ores - Determination of carbon and sulfur content - High frequency combustion with infrared absorption method
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| GB/T 6730.61-2005 | English | 85 |
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Iron ores -- Determination of carbon and sulfur content -- High frequency combustion with infrared absorption method
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GB/T 6730.61-2022: Iron ores - Determination of carbon and sulfur content - High frequency combustion with infrared absorption method
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.10
CCS D 31
Replacing GB/T 6730.61-2005
Iron Ores - Determination of Carbon and Sulfur Content -
High Frequency Combustion with Infrared Absorption
Method
Issued on. OCTOBER 12, 2022
Implemented on. FEBRUARY 1, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 6
4 Principle... 6
5 Reagents and Materials... 6
6 Instruments and Equipment... 7
7 Sampling and Sample Preparation... 8
8 Analytical Procedures... 9
9 Result Calculation and Presentation... 12
10 Test Report... 14
Appendix A (informative) Constituent Documents of GB/T 6730... 15
Appendix B (normative) Acceptance Procedures for Specimen Analysis Results... 20
Appendix C (informative) Original Data of Precision Test... 21
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document is Part 61 of GB/T 6730 Iron Ores. The parts of GB/T 6730 that have been
issued are shown in Appendix A.
This document serves as a replacement of GB/T 6730.61-2005 Iron Ores - Determination of
Carbon and Sulfur Content - High Frequency Combustion with Infrared Absorption Method. In
comparison with GB/T 6730.61-2005, apart from structural adjustments and editorial
modifications, the main technical changes are as follows.
a) Compound flux is added (see 5.3);
b) The requirements in “Sampling and Sample Preparation” are modified (see Chapter
7; Chapter 6 of Version 2005);
c) The stipulations of “sampling size” are modified (see 8.2; 7.2 of Version 2005);
d) The addition mode of compound flux is added (see 8.3 and 8.4);
e) The result calculation and its presentation are modified (see Chapter 9; Chapter 8 of
Version 2005).
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by China Iron and Steel Association.
This document shall be under the jurisdiction of National Technical Committee 317 on Iron Ore
and Direct Reduced Iron of Standardization Administration of China (SAC/TC 317).
The drafting organizations of this document. Changsha Institute of Mining and Metallurgy
Testing Technology Co., Ltd.; Hunan Huoshen Instrument Co., Ltd.; Liuzhou Iron & Steel Co.,
Ltd.; Hebei Jinxi Iron and Steel Group Co., Ltd.; China Metallurgical Information and
Standardization Institute; Jinan Customs District P. R. China; Pangang Group Research Institute
Co., Ltd.; NCS Testing Technology Co., Ltd.
The main drafters of this document. Zhang Zhiyong, Zhu Zhiyuan, Rong Jinxiang, Yang Lin,
Qiang Qiang, Jiang Lirong, Zhu Rong, Xu Mingwang, Ma Yongfu, Li Zishang, Liu Yanhua, Xu
Bin, Chen Shu, Wang Yingjie, Zheng Xiaomin, Lin Fei.
This document was firstly issued in 2005.This is the first revision.
1 Scope
This document specifies the determination of carbon and sulfur content in iron ore by high
frequency combustion with infrared absorption method.
This document is applicable to the determination of carbon and sulfur content in natural iron
ore, iron ore concentrate, sinter, pellets and their products. The determination range (mass
fraction) is. carbon 0.01% ~ 2.5%, sulfur 0.001% ~ 2.0%.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 6730.1 Iron Ores - Preparation of Predried Test Samples for Chemical Analysis
GB/T 6730.3 Iron Ores - Determination of Hygroscopic Moisture in Analytical Samples -
Gravimetric, Karl Fischer and Mass-loss Methods
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of
Limiting Values
GB/T 10322.1 Iron Ores - Sampling and Sample Preparation Procedures
GB/T 12806 Laboratory Glassware - One-mark Volumetric Flasks
GB/T 12807 Laboratory Glassware - Graduated Pipettes
GB/T 12808 Laboratory Glassware - One-mark Pipettes
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Principle
The specimen is heat and burned in the oxygen flow of a high-frequency induction furnace, and
the generated carbon dioxide (or carbon monoxide) and sulfur dioxide are carried by oxygen to
the measurement chamber of the infrared analyzer.
5 Reagents and Materials
Unless it is otherwise specified in analysis, use only approved reagents of analytical purity and
Grade-2 water specified in GB/T 6682 or water of equivalent purity.
5.1 Magnesium perchlorate. anhydrous, particle size. 0.7 mm ~ 1.2 mm.
5.2 Caustic soda asbestos. granular.
5.5 Tin particles. carbon content (mass fraction) less than 0.002%, sulfur content (mass fraction)
less than 0.0005%. If necessary, use acetone (see 5.6) to clean the surface and dry at room
temperature.
5.6 Acetone. the carbon content (mass fraction) in the evaporated residue is less than 0.005%.
5.7 Pure iron flux. carbon content (mass fraction) less than 0.002%, sulfur content (mass
fraction) less than 0.0005%.
5.10 Sulfur standard solution. in accordance with Table 1, weigh-take potassium sulfate,
accurate to 0.0002 g. After using distilled water to dissolve it, transfer it to a 50 mL volumetric
flask, dilute to the mark and shake it well.
5.11 Oxygen. purity greater than 99.5%.
5.12 Power gas source. nitrogen, argon or compressed air, and the impurity (water and oil)
contents are less than 0.5%.
5.13 Tin tube. with a capacity of 0.3 mL, a diameter of 5 mm and a length of 17 mm.
6 Instruments and Equipment
Unless otherwise specified in the analysis, the used common laboratory instruments, one-mark
volumetric flasks, graduated pipettes and one-mark pipettes shall respectively comply with the
stipulations of GB/T 12806, GB/T 12807 and GB/T 12808.
6.1 Micropipette (micro-syringe), with a capacity of 50 L.
6.2 Infrared carbon and sulfur analyzer, with a sensitivity of 1 106, including the following
parts.
6.3 Ceramic crucible, with precise assembly dimensions, is suitable for the support column, so
that it can be lifted to an accurate height in the induction coil; fire at above 1,000 C for 2 h in
Sulfur Standard Solution
6.4 Air source, including the following parts.
6.5 High-frequency induction furnace, which shall satisfy the requirements for the melting
temperature of specimen.
6.6 Control system, including the following parts.
6.7 Measuring system, which is mainly composed of a balance (with a sensitivity of less than
1.0 mg), infrared analyzer and electronic measuring component, etc.
7 Sampling and Sample Preparation
7.1 Laboratory Specimen
In accordance with GB/T 10322.1, conduct sampling and sample preparation. Generally, the
particle size of the specimen shall be less than 100 m.
8 Analytical Procedures
WARNING---during the analysis process, prevent burns and discharge the oxygen
released from the burning specimen to the outside of the laboratory to prevent the local
oxygen concentration from being too high to catch fire. Perform high frequency shielding
to effectively avoid radiation hazards.
8.1 Times of Determination
In accordance with Appendix B, perform independent determination at least twice on the same
pre-dried specimen.
8.2 Sampling Size
In accordance with Table 2, weigh-take test specimens, accurate to 0.0001 g.
8.3 Blank Test
Along with the specimen, conduct blank test. In accordance with 8.3 a) or 8.3 b), add flux, and
conduct at least three blank tests; the requirements for the mode of adding flux in the blank test
and the specimen analysis test are consistent.
8.4 Preparation of Carbon and Sulfur Standard Series
8.4.1 Preparation of carbon standard series
In accordance with Table 3, weigh-take barium carbonate (see 5.8), accurate to 0.0002 g. In
accordance with 8.4.1 a) or 8.4.1 b), add flux and take it as the carbon standard series.
8.5 Preparation before Analysis
8.5.1 Before calibrating and measuring the specimen, check and debug the instrument to ensure
that the instrument is in a normal and stable working state and determining the optimum
analysis conditions.
8.6 Calibration
8.6.1 Use the prepared carbon and sulfur standard series to calibrate simultaneously or
separately
8.7 Specimen Analysis
In accordance with 7.2, weigh-take the specimen; in accordance with the mode of 8.7 a) or 8.7
9 Result Calculation and Presentation
9.1 Measurement of Carbon and Sulfur Content
In accordance with the relations between the absorption energy and the concentration of carbon
and sulfur, obtain the carbon and sulfur content from the calibration curve.
9.2 General Processing of Analysis Results
9.2.1 Precision
The function relation of precision is shown in Table 5.The original data of the precision test is
shown in Appendix C.
9.2.2 Determination of analysis results
In accordance with the steps in Appendix B, compare the results of independent repeated
measurements with the repeatability limit r, so as to determine the final analysis results.
9.2.5 Calculation of final result
The final result of the specimen is the arithmetic mean of the acceptable analysis values, or the
value measured by operating in accordance with the stipulations in Appendix B, which is
rounded to three decimal places in accordance with the stipulations of GB/T 8170.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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