GB/T 2565-2014 PDF English
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Determination of grindability index of coal -- Hardgrove method
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| GB/T 2565-1998 | English | 279 |
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Determination of grindability index of coal(Hardgrove method)
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GB/T 2565-2014: PDF in English (GBT 2565-2014) GB/T 2565-2014
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
D 21
Replacing GB/T 2565-2014
Determination of grindability index of coal –
Hardgrove method
(ISO 5074.1994, Hard Coal –
Determination of Hardgrove grindability index, MOD)
ISSUED ON. JUNE 09, 2014
IMPLEMENTED ON. OCTOBER 01, 2014
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Method summary ... 5
4 Reagents and materials ... 6
5 Instruments and equipment ... 6
6 Preparation of coal samples ... 9
7 Instrument calibration ... 10
8 Determination steps ... 10
9 Result processing ... 11
10 Precision of method ... 12
11 Test report ... 12
Appendix A (Informative) Clause number comparison between this standard
and ISO 5074.1994 ... 13
Appendix B (Informative) Technical differences between this standard and ISO
5074.1994 and their causes ... 14
Appendix C (Normative) Calibration of Hardgrove tester ... 15
Foreword
This standard was drafted in accordance with the rules given in GB/T1.1-2009.
This standard replaces GB/T 2565-1998 “Determination of grindability index of
coal - Hardgrove method”. As compared with GB/T 2565-1998, the main
changes are as follows.
- ADD the introduction, reagents and materials, and test reports (SEE
Introduction, Chapter 4, and Chapter 11);
- ADD the requirements for air drying of coal samples during sample
preparation (SEE 6.2);
- ADD the use of a linear regression equation to calculate the Hardgrove
grindability index (SEE C.2 of Appendix C).
This standard, using the redrafting method, modifies and adopts ISO
5074.1994 Hard Coal - Determination of Hardgrove grindability index.
As compared with ISO 5074.1994, this standard has some structural changes,
AND Appendix A provides the clause number comparison between this
standard and ISO 5074.1994.
There are technical differences between this standard and ISO 5074.1994,
and the terms involved in these differences have been indicated by a vertical
single line (︱) in the blank position on the outside margin. AND Appendix B
provides the list of the corresponding technical differences and their causes.
This standard was proposed by China Coal Industry Association.
This standard shall be under the jurisdiction of the National Coal
Standardization Technical Committee (SAC/TC 42).
The drafting organizations of this standard. Coal Science Research Institute -
Detection and Research Branch, Shenhua Sales Group Co., Ltd.
The main drafters of this standard. Yang Huayu, Zhang Yunhong, Zhang
Baoging, Xue Junhai, Wang Zhenhua.
GB/T 2565-1998 replaces the standard previously issued as follows.
- GB 2565-1981; GB 2565-1987.
Introduction
The grindability index of coal is a comprehensive manifestation of the physical
properties of coal, such as hardness and strength, AND is generally measured
by the Hardgrove method (Hardgrove grindability index tester, referred to as
Hardgrove apparatus), in order to assess the difficulty of grinding coal into
powder.
Two important factors influencing the reliability of the grindability index
determination results of coal are the coal sample preparation method (coal
sample particle size range) and the moisture content in the coal.
The grindability index of coal can be used to assess the yield and energy
consumption of industrial pulverizers.
Determination of grindability index of coal –
Hardgrove method
1 Scope
This method specifies the method summary, reagents and materials,
instruments and equipment, coal sample preparations, instrument calibration,
determination procedures, result calculation, method precision, and test report,
etc., of using the Hardgrove methods (hereinafter referred to as the Hardgrove
method) to determine the grindability index of coal.
This standard applies to bituminous coal and anthracite.
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) are applicable to this Standard.
GB 474 Method for preparation of coal sample
GB/T 483 General rules for analytical and testing methods of coal
GB/T 6003.1 Test sieves - Technical requirements and testing - Part 1. Test
sieve of metal wire cloth
GB/T 19494.2 Mechanical sampling of coal - Part 2. Method for sample
preparation
3 Method summary
The coal sample of a certain particle size range and mass is sieved under the
specified conditions after being grinded by the Hardgrove grindability tester,
the mass of coal sample remaining on the sieve is weighed, the mass of the
coal sample passing through the sieve is obtained by deducting the mass of
the coal sample remaining on the sieve from the mass of coal sample before
grinding, AND it may find the Hardgrove grindability index of the coal from the
standard diagram as drawn from the Hardgrove grindability index standard
substance of coal or calculate through the unary linear regression equation.
re-preparation, it can conduct test, BUT it shall indicate the sampling rate, AND
the result is for reference only.
6.5 As for the prepared 0.63 mm ~ 1.25 mm coal sample, CONDUCT air drying
using the air drying method as specified in GB 474; after reaching to the air
drying state, FOLLOW Chapter 8 to conduct determination.
7 Instrument calibration
7.1 USE the Hardgrove grindability index standard substance of the coal to
calibrate the Hardgrove tester at least once every year using the methods as
specified in Appendix C.
7.2 In case of changing the operators and instruments, renewing or repairing
the equipment (including the test sieve), OR having doubt of the determination
results, it shall use the Hardgrove grindability index standard substance of the
coal to conduct calibration.
8 Determination steps
8.1 Test RUN the Hardgrove tester to check whether it is normal, AND the
tester shall be able to automatically stop running after (60 ± 0.25) r; CHECK
the surface of the 0.071 mm sieve and REPLACE it if it is loosened.
8.2 USE the short hair brush to thoroughly clean the grinding bowl, grinding
ring and steel ball, and MAKE the steel ball distribute into the groove of the
grinding bowl as evenly as possible.
8.3 MIX the 0.63 mm ~ 1.25 mm coal samples evenly; USE the riffle to reduce
120 g; USE the 0.63 mm sieve to make it subjected to sieving on the vibrating
sieving machine for 5 min, in order to eliminate the coal powder less than 0.63
mm; USE the riffle again to reduce two coal samples with each mass not less
than 50 g.
8.4 WEIGH (50 ± 0.01) g of the coal sample (m) which had been removed of
coal powder, accurate t 0.01 g. POUR the coal powder evenly into the grinding
bowl; FLATTEN its surface; USE the short hair brush to clear the coal sample
falling onto the steel ball and the grinding bowl projections to the steel ball
surroundings; when the cross groove of the grinding ring is basically in line
with the cross head at the lower end of the main shaft direction, PLACE the
grinding ring in the grinding bowl.
Appendix C
(Normative)
Calibration of Hardgrove tester
C.1 USE the 4 Hardgrove grindability index standard substance of coal to
calibrate the Hardgrove tester, and MAKE the calibration diagram or
CALCULATE the unary linear regression equation parameters.
C.1.1 USE the Hardgrove tester to be calibrated to conduct determination of
the 4 Hardgrove grindability index standard substance of coals, with each
Hardgrove grindability index standard substance of coal being repeatedly
determined for 4 times; CALCULATE the mass of the substance passing
through the 0.071 mm sieve; CALCULATE four times of the arithmetic mean of
the mass of the substance passing through the 0.071 mm sieve.
C.1.2 On the rectangular coordinate system drawing, USE the arithmetic mean
of the mass of the substance passing through the 0.071 mm sieve as
determined four times as the ordinate AND the corresponding Hardgrove
grindability index standard substance as the abscissa to draw the test data of
the Hardgrove grindability index standard substance of the coal based on the
least square method. The resulting line is the calibration chart of the Hardgrove
tester (sieve, etc.)...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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