GB/T 6730.2-2018 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 6730.2-2018 | English | 90 |
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Iron ores -- Determination of moisture content -- Gravimetric method
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| GB/T 6730.2-1986 | English | 159 |
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Methods for chemical analysis of iron ores. Gravimetric method for the determination of moisture content
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GB/T 6730.2-2018: Iron ores -- Determination of moisture content -- Gravimetric method---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/GBT6730.2-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.10
D 31
Replace GB/T 6730.2-1986
Iron ores - Determination of moisture content -
Gravimetric method
Issued on. MAY 14, 2018
Implemented on. FEBRUARY 1, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Principle... 4
4 Instruments and tools... 4
5 Sampling and sample preparation... 5
6 Analysis steps... 5
7 Result's calculation and its representation... 5
8 Test report... 6
Appendix A... 8
Foreword
GB/T 6730 "Iron ores" is divided into dozens of parts.
This part is Part 2 of GB/T 6730.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 6730.2-1986 "Methods for chemical analysis of iron
ores. Gravimetric method for the determination of moisture content". Compared
with GB/T 6730.2-1986, the main technical changes are as follows except for
editorial modification.
- Added "Foreword", "Warning", "Chapter 2, Normative references", "Chapter
5, Sampling and sample preparation" and "Chapter 8, Test report";
- Replaced "Summary of Methods" with "Principle", and revised the
expression of the principle (see Chapter 3; Chapter 1 of the 1986 edition);
- Modified the relevant expressions in "Instruments and tools" (see Chapter
4; Chapter 2 of the 1986 edition);
- Modified the specific requirements for the sample in "Analysis steps". the
weighed mass, the requirements of the thickness of the sample (see Chapter
6; Chapter 3 of the 1986 edition);
- Modified the calculation formula of the analysis results, and added the
provisions for the tolerance in the laboratory (see 7.2.1);
- Added the normative appendix "Acceptance procedures of the sample’s
analysis results" (see Appendix A).
This part was proposed by China Iron and Steel Association.
This part shall be under the jurisdiction of the National Standardization
Technical Committee for Iron Ore and Direct Reduced Iron (SAC/TC317).
Drafting organizations of this part. Ansteel Group Mining Co., Ltd.
The main drafters of this part. Chen Zhihua, Shen Hengchang, Gao Jingjun,
Tang Yanxiu, Wang Dan, Ma Caiyun.
This part replaces the following previous standard.
- GB/T 6730.2-1986.
Iron ores - Determination of moisture content -
Gravimetric method
Warning -- The personnel using this part shall have practical experience
in formal laboratory work. This part does not indicate all possible safety
issues. The user is responsible for taking appropriate safety and health
measures and ensuring compliance with the conditions stipulated by
relevant national laws and regulations.
1 Scope
This part of GB/T 6730 specifies the determination of moisture content in iron
ore by the gravimetric method.
This part applies to the determination of moisture content in iron ore, iron
concentrate, sinter, and pellets.
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) is applicable to this standard.
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 10322.1 Iron ores -- Sampling and sample preparation procedures
3 Principle
Place a certain amount of samples in a drying oven, dry at 105 °C ± 2 °C to get
constant weight; measure the loss of the mass, and calculate the content of the
moisture.
4 Instruments and tools
4.1 Electronic platform scale or balance. the range is 2000 g; it shall be accurate
to 0.5 g.
4.4 Mixing sample plate. a smooth, clean, stainless metal plate or glass plate
(about 100 cm × 100 cm).
4.5 Mixing sample shovel. The surface shall be smooth, clean; it shall be made
of stainless metal plate.
4.6 Sample tube. it shall have a cover; it can hold 5 kg of sample.
5 Sampling and sample preparation
Take and prepare samples according to the method specified in GB/T 10322.1;
the particle size is less than 20 mm.
6 Analysis steps
Move the sample to be tested from the sample cylinder (see 4.6) to the mixing
sample plate (see 4.4), and quickly mix well with a mixing sample shovel (see
4.5).
7 Result's calculation and its representation
7.1 Calculation of moisture content
Calculate the moisture content (mass fraction) ω in the sample according to
formula (1), and its value is expressed as a percentage.
7.2 General handling of analysis results
7.2.1 Tolerance
The tolerances of the analysis results are listed in Table 1.
8 Test report
The test report shall include the following.
Appendix A
(Normative appendix)
Acceptance Procedure of the Sample's Analysis Results
The acceptance procedure of the sample's analysis results is shown in Figure
A.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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