GB/T 24521-2009 (GB/T 24521-2018 Newer Version) PDF English
GB/T 24521-2009 (GB/T24521-2009, GBT 24521-2009, GBT24521-2009)
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| GB/T 24521-2018 | English | 85 |
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Method for the determination of specific resistance of carbon raw materials and coke
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| GB/T 24521-2009 | English | 180 |
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Method for the determination of specific resistance of coke
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Newer version: GB/T 24521-2018 Standards related to (historical): GB/T 24521-2018
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GB/T 24521-2009: PDF in English (GBT 24521-2009) GB/T 24521-2009
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.160.10
H 32
Method for the determination of specific resistance of
coke
ISSUED ON: OCTOBER 30, 2009
IMPLEMENTED ON: MAY 01, 2010
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Replaced by GB/T 24521-2018
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Principle ... 4
4 Instruments ... 4
5 Sample preparation ... 8
6 Test procedure ... 8
7 Result calculation ... 10
8 Test report ... 11
Method for the determination of specific resistance of
coke
1 Scope
This Standard specifies the principle, instruments, samples, test procedure,
and result calculation of the determination of specific resistance of coke.
This Standard applies to the determination of specific resistance of coke,
graphite, roasted crushed and calcined anthracite.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 1997 Coke - Sampling and preparation of samples
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
3 Principle
PUT a dry sample of a certain particle size into the sample tank, PASS a certain
intensity of current under a certain pressure, MEASURE the voltage drop at the
two ends of the sample, and CALCULATE the specific resistance of the sample
according to Ohm’s law.
4 Instruments
4.1 Specific resistance tester (see Figure 1).
increased so that the line current can reach 300 mA). The detection circuit is
shown in Figure 4.
6.2 Measurement of the line voltage drop: PLACE the upper movable column
directly on the lower movable column, HANG the weights, TURN the handle
clockwise to make the lever level, ADJUST the line current to 300 mA, and
RECORD the voltmeter reading V0 (the reading shall be less than 1 mV,
otherwise twist the upper movable column or gently sand the contact surface
of the upper and lower movable columns with sandpaper to remove the oxide
film, so that the line voltage drops below 1 mV).
6.3 Determination of the position of the spiral micrometer barrel: PLACE the
standard steel column between the upper and lower movable columns, HANG
the weights, TURN the handle clockwise to make the lever level, ADJUST the
position of 16.0 of the spiral micrometer barrel to make it align with the pointer,
TIGHTEN the jackscrew on the spiral micrometer barrel to make the spiral
micrometer barrel fixed; TURN the handle counterclockwise two turns, and then
TURN the handle clockwise again to make the lever level, and CHECK whether
the spiral micrometer barrel is in the correct position .
6.4 ALIGN the score line on the sample tank with the upper edge of the
orientation circle, TIGHTEN the jackscrew, and PLACE it on the lower movable
column; PLACE the funnel on the sample tank; MEASURE the sample with a
measuring cup, and slowly POUR it into the funnel, making the sample enter
the sample tank in about 20 s.
6.5 REMOVE the funnel, TURN the handle so that the pointer points to the
position where the 16.0 mm of the spiral micro barrel is after it rotates
counterclockwise two turns, carefully PLACE the upper movable column,
CONNECT the lever, HANG the weights, slowly ROTATE the handle half a turn
clockwise at a uniform speed, UNSCREW the jackscrew on the orientation
circle, the weights shall sink slightly, and continue to slowly ROTATE the handle
clockwise at a uniform speed until the lever is level.
6.6 ADJUST the line current to 300 mA, RECORD the reading of the voltmeter,
READ and RECORD the height of the sample from the position pointed by the
pointer of the spiral micrometer barrel.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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