GB/T 6730.2-2018 PDF in English
GB/T 6730.2-2018 (GB/T6730.2-2018, GBT 6730.2-2018, GBT6730.2-2018)
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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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Standards related to (historical): GB/T 6730.2-2018
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GB/T 6730.2-2018: PDF in English (GBT 6730.2-2018) GB/T 6730.2-2018
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
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.
4.2 Drying oven: it shall have an automatic temperature controller and a blower
device.
4.3 Sample tray: a smooth, clean, stainless metal tray (the bottom area is about
600 cm2, the depth is about 2 cm).
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). After sample splitting, weigh two 1000 g of samples (the accuracy shall be
0.5 g); respectively place them to the dry sample trays with known masses (m1)
(see 4.3); make the sample flattened, and the thickness of the sample shall not
be more than 30 mm; weigh it to get the mass (m2). Put it into a drying oven at
105 °C ± 2 °C for 2 hours; take it out, and weigh it while it is still hot. Then, put
it into the drying oven again for 30 min; take it out, and weigh it again while still
hot. Repeat the operation until the weight is constant (the difference between
two-time weights is not more than 0.5 g); record the last weighing's mass (m3).
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:
where:
...... Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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