GB/T 211-2017_English: PDF (GB/T211-2017)
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Determination of total moisture in coal
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GB/T 211-2017
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| GB/T 211-2007 | English | 70 |
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Determination of total moisture in coal
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GB/T 211-2007
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| GB/T 211-1996 | English | 239 |
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Determination of total moisture in coal
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GB/T 211-1996
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| GB 211-1984 | English | 199 |
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Determination of total moisture in coal
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GB 211-1984
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| Standard ID | GB/T 211-2017 (GB/T211-2017) | | Description (Translated English) | Determination of total moisture in coal | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D21 | | Classification of International Standard | 73.040 | | Word Count Estimation | 10,115 | | Date of Issue | 2017-09-07 | | Date of Implementation | 2018-04-01 | | Older Standard (superseded by this standard) | GB/T 211-2007 | | Drafting Organization | Coal Science and Technology Research Institute Co., Ltd. Detection Branch | | Administrative Organization | National Coal Standardization Technical Committee (SAC / TC 42) | | Proposing organization | China Coal Industry Association | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee | | Standard ID | GB/T 211-2007 (GB/T211-2007) | | Description (Translated English) | Determination of total moisture in coal | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D21 | | Classification of International Standard | 73.040 | | Word Count Estimation | 13,111 | | Date of Issue | 2007-11-01 | | Date of Implementation | 2008-06-01 | | Older Standard (superseded by this standard) | GB/T 211-1996 | | Quoted Standard | GB 474; GB/T 19494.2; GB/T 212 | | Adopted Standard | ISO 589-2003, NEQ | | Drafting Organization | CCRI coal analysis laboratory | | Administrative Organization | National Coal Standardization Technical Committee | | Regulation (derived from) | National Standard Approval Announcement 2007 No.12 (Total No.112) | | Proposing organization | China Coal Industry Association | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the total moisture in coal reagents determination, equipment, procedure, outcome for and precision. Dried in a nitrogen flow method (Method A1 and a method B1) for all coal, dried in an air stream into a method (Method A2 and method B2) suitable bituminous coal and anthracite, microwave drying method (Method C) applies bituminous coal and lignite. Arbitration as a method to method A1. | | Standard ID | GB/T 211-1996 (GB/T211-1996) | | Description (Translated English) | Determination of total moisture in coal | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D21 | | Classification of International Standard | 75.160.10 | | Word Count Estimation | 6,627 | | Date of Issue | 1996/6/14 | | Date of Implementation | 1997/2/1 | | Older Standard (superseded by this standard) | GB 211-1984 | | Quoted Standard | GB 474 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 12, 2007 (No. 112 overall) | | Proposing organization | People Republic of China Ministry of Coal Industry | | Issuing agency(ies) | State Bureau of Technical Supervision |
GB/T 211-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
D 21
Replacing GB/T 211-2007
Determination of Total Moisture in Coal
(ISO 589.2008, Hard Coal-Determination of Total Moisture, NEQ)
ISSUED ON. SEPTEMBER 7, 2017
IMPLEMENTED ON. APRIL 1, 2018
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.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Method Summary ... 4
4 Reagent and Materials ... 5
5 Apparatus ... 5
6 Sample ... 6
7 Procedures ... 6
8 Precision of the Methods ... 10
9 Test Report ... 10
Appendix A (Informative) Determination of Total Moisture in Coal by Drying by
Microwave ... 12
Foreword
This Standard is drafted in accordance with GB/T 1.1-2009.
This Standard replaces GB/T 211-2007 “Hard Coal - Determination of Total Moisture”.
In comparison with GB/T 211-2007, in addition to editorial changes, the main technical
content changes are as follows.
— Method C (drying by microwave) is deleted (please refer to 3.3 in Version 2007);
— 13mm sample is added to Method B1 (please refer to 3.2.1 in Version 2007);
— Moisture loss correction of dry air during the sampling is added (please refer to
7.4);
— Informative appendix (determination of total moisture in coal through the method
of drying by microwave) is added (please refer to Appendix A).
This Standard is redrafted in accordance with ISO 589.2008 “Hard Coal -
Determination of Total Moisture”. The consistent degree between this Standard and
ISO 589.2008 is not equivalent.
This Standard was proposed by the China National Coal Association.
This Standard shall be under the jurisdiction of the National Technical Committee on
Coal Chemical Industry of Standardization Administration of China.
Drafting organization of this Standard. Coal Analysis and Test Laboratory of China
Coal Research Institute.
Chief drafting staffs of this Standard. Zhang Bo, Sun Gang and Li Hongtu.
The previous editions of the standard replaced by this Standard are as follows.
— GB 211-1963, GB 211-1984, GB/T 211-1996 and GB/T 211-2007.
Determination of Total Moisture in Coal
1 Scope
This Standard specifies the method summary, reagent and materials, apparatus,
procedures, result calculation, precision and test report for the determination of total
moisture in coal.
The method of drying under nitrogen (Method A1 and B1) shall be applicable to all
types of coals; the method of drying in air (Method A2 and B2) shall be applicable to
bitumite (excluding easily oxidized coal) and blind coal.
Method A1 shall be the arbitration method in this Standard.
Note. the method of drying by microwave that’s applicable to the rapid determination
of total moisture is also provided in this Standard. The method of drying by microwave
is applicable to bitumite and lignite. Please see Appendix A for details.
2 Normative References
The following documents are indispensable in the implementation of this Standard.
For the dated references, only the dated versions are applicable to this Standard. For
the undated references, the latest edition (including all the amendments) are
applicable to this Standard.
GB/T 212 “Proximate Analysis of Coal”
GB 474 “Method for Preparation of Coal Sample”
GB/T 19494.2 “Mechanical Sampling of Coal - Part 2. Method for Sample
Preparation”
3 Method Summary
3.1 Method A (two-stage method)
3.1.1 Method A1. drying under nitrogen
Weigh-take a certain amount of 13mm coal samples; dry them in the environment
where the temperatures do not exceed 40°C, until the constant mass is reached.
Crush the sample into particle size lower than 3mm; dry them under nitrogen at
(105~110) °C, until the constant mass is reached. Calculate the total moisture from
with a sufficiently rapid rate of atmosphere change, for instance, more than 5 times
per hour.
5.2 Nitrogen-flushed oven. with device for automatic temperature control, capable of
being controlled at (105~110)°C, able to accommodate appropriate weighing bottles
with a little more room to spare, with inlet and outlet for nitrogen, and allow more than
15 times of atmosphere change per hour.
5.3 Analytical balance. division value is 0.001g.
5.4 Industrial balance. division value is 0.1g.
5.5 Dryer. contain allochronic silica gel or granular anhydrous calcium chloride.
5.6 Flow meter. with a measuring range of (100~1000)mL/min.
5.7 Drying tower. with a volume of 250ml and contain allochronic silica gel or granular
anhydrous calcium chloride.
6 Sample
6.1 According to GB 474 or GB/T 19494.2, prepare the sample for total moisture. In
which, for 13mm coal sample for total moisture, it shall not be less than 3kg; for 6mm
sample for total moisture, it shall not be less than 1.25kg.
6.2 Before determining the total moisture in coal sample, it shall firstly check the
sealing condition of the container. Afterwards, clean the surface; weigh the sample
with an industrial balance to the nearest 0.1% of its total mass; check the result with
the total mass indicated on the label. If there’s a loss of mass and it can be
ascertained that there is no sample loss during transportation or storage, then the
mass reduced shall be regarded as that of the lost moisture. Calculate the percentage
of moisture loss and make correction in accordance with what’s mentioned in 7.3. If
the loss of mass is greater than 1.0%, then, it is not allowed to perform correction of
moisture loss; when reporting the results, it shall indicate that “the moisture loss is not
corrected” AND report the container label and sealing condition.
6.3 Before weighing-taking the sample, it shall well mix (mixing time is not less than 1
min) the sample.
7 Procedures
7.1 Method A (two-stage method)
7.1.1 Free moisture (Methods A1 and A2, drying in air)
Use a pre-dried and weighed tray to quickly take-weigh 490g~510g (accurate to 0.1g)
two continuous inspections is not more than 0.01g or the mass increases. In the latter
case, the mass of the previous inspection shall be adopted as the reference for
calculation.
7.2.2 Method B2 (drying in air)
7.2.2.1 Total moisture in 13 mm coal sample
7.2.2.1.1 Use a pre-dried and weighed tray to quickly weigh-take 490g~510g
(accurate to 0.1g) of 13 mm coal sample; spread it evenly.
7.2.2.1.2 Put the tray in an air-drying oven which has been preheated to
(105~110)°C. Under the condition of air-blowing, for bitumite, dry for 2h; for blind coal,
dry for 3h.
7.2.2.1.3 Remove the tray and weigh it (accurate to 0.1g) while it is still hot.
7.2.2.1.4 Conduct drying inspection, 30min each time, until each mass reduction in
two continuous inspections is less than 0.5g or the mass increases. In the latter case,
the mass of the previous inspection shall be adopted as the reference for calculation.
7.2.2.2 Total moisture of 6mm coal sample
Except that the nitrogen-flushed oven is replaced by the air-drying oven, the
procedures are the same as that in 7.2.1.
7.2.3 Result calculation
Total moisture in coal shall be calculated in accordance with Formula (4);
Where,
Mt — the total moisture in coal sample, %;
m — the mass of weighed coal sample, unit is gram (g);
m1 — the mass loss after the coal sample is dried, unit is gram (g).
7.3 Moisture loss correction in the sample
If there is a need for moisture correction, the value of corrected total moisture shall be
calculated in accordance with Formula (5).
......
GB/T 211-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
D 21
Replacing GB/T 211-1996
Determination of Total Moisture in Coal
(ISO 589.2003, Hard Coal-Determination of Total Moisture, NEQ)
ISSUED ON. NOVEMBER 1, 2007
IMPLEMENTED ON. JUNE 1, 2008
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.
Table of Contents
1 Scope ... 5
2 Normative References ... 5
3 Method Summary ... 5
4. Reagent ... 6
5 Apparatus (Method A and Method B) ... 6
6 Sample ... 7
7 Procedures ... 8
8 Precision of the Methods ... 11
9 Test Report ... 11
Appendix A ... 13
Foreword
This Standard is corresponding to ISO 589.2003 "Hard Coal-Determination of Total
Moisture". The consistent degree between this Standard and ISO 589.2003 is not
equivalent. Their main differences are as follows.
— According to China's realities, the 11.2mm and 2.8mm particle sizes are
replaced by the similar 13mm and 3mm particle sizes;
— The determination of total moisture with coal sample of particle size smaller than
6mm, under certain conditions, is added;
— The determination of total moisture by microwave-drying is added;
— Lignite is added into the scope.
This Standard replaces GB/T 211-1996 "Determination of Total Moisture in Coal".
Compared with GB/T 211-1996, this Standard has the main changes as follows.
— The foreword is added;
— The structure is adjusted so that it is basically consistent with that of ISO
589.2003.
— The mass of coal sample with particle size smaller than 13mm is changed to
3kg, and that of coal sample with particle size smaller than 6mm is changed to
1.25kg (3.1 of the previous edition; 6.1 of this edition);
— The determination of inherent moisture under nitrogen is added in the two-stage
method (7.1.2 of this edition);
— The particle size of samples for the determination of inherent moisture by the
two-stage method is changed from smaller than 6mm to smaller than 3mm
(7.3.2.2 in the previous edition; 7.1.2.1 in this edition).
Appendix A of this Standard is normative.
This Standard was proposed by the China National Coal Association.
This Standard shall be under the jurisdiction of the National Technical Committee on
Coal Chemical Industry of Standardization Administration of China.
Drafting organization of this Standard. Coal Analysis and Test Laboratory of China
Coal Research Institute.
Chief drafting staffs of this Standard. Li Hongtu and Sun Gang.
Determination of Total Moisture in Coal
1 Scope
This Standard specifies the reagent, apparatus, procedures, result calculation and
precision for the determination of total moisture in coal.
The methods of drying under nitrogen (Method A1 and B1) are applicable to all types
of coals; the method of drying in air (Method A2 and B2) are applicable to bitumite and
blind coal; and the method of drying by microwave is applicable to bitumite and lignite.
Method A1 shall be the arbitration method.
2 Normative References
The following normative documents contain the provisions which, through reference in
this Standard, constitute the provisions of this Standard. For the dated references, the
subsequent amendments (excluding corrigendum) or revisions of these publications
do not apply. However, the parties who reach an agreement according to this
Standard are encouraged to study whether the latest editions of these documents are
applicable. For the undated references, the latest edition referred to applies.
GB 474 "Method for Preparation of Coal Sample"
GB/T 19494.2 "Mechanical Sampling of Coal Part 2. Method for Sample
Preparation" (GB/T 19494.2-2004, ISO 13909-4.2001 NEQ)
GB/T 212 "Proximate Analysis of Coal" (GB/T 212-2001, eqv ISO 11722.1999, eqv
ISO 1171.1997, eqv ISO 562.1998)
3 Method Summary
3.1 Method A (two-stage method)
3.1.1 Method A1. drying under nitrogen
Coal sample of certain amount with particle size smaller than 13mm is dried in the
environment where the temperatures do not exceed 40°C, until the constant mass is
reached. Crush the sample into particle size lower than 3mm; dry them under nitrogen
at (105~110)°C, until the constant mass is reached. Calculate the total moisture from
the loss in mass at each of the two stages.
3.1.2 Method A2. drying in air
5.3 Tray. made of heat-and-corrosion-resistant material such as galvanized iron and
aluminum, able to accommodate 500g of coal samples, with unit area loading not
exceeding 1g/cm2.
5.4 Glass weighing bottle. with diameter of 70mm, height of (35~40)mm, a tight
grinded lid.
5.5 Analytical balance. with a sensitivity of 0.001g.
5.6 Industrial balance. with a sensitivity of 0.1g.
5.7 Dryer. which contains allochroic silica gel or granular anhydrous calcium
chloride.
5.8 Flow meter. with a measuring range of (100~1000)mL/min.
5.9 Drying tower. with a volume of 250ml and contains allochroic silica gel or
granular anhydrous calcium chloride.
6 Sample
6.1 Coal sample
Coal sample for determining total moisture with particle size smaller than 13mm shall
not be less than 3kg; sample with particle size smaller than 6mm shall not be less
than 1.25kg.
6.2 Preparation of coal sample
6.2.1 Coal sample for determining total moisture with particle size smaller than
13mm shall be prepared according to GB 474 or GB/T 19494.2.
6.2.2 Coal sample for determining total moisture with particle size smaller than 6mm is
prepared through one time of crushing by the machine which causes no obvious
moisture loss1. Use a riffle immediately to divide the coal samples; and put a part not
less than 1.25kg in a sealed container.
6.3 Sealing condition of the container shall be checked before determining the total
moisture in coal sample. After that, clean the surface; weigh the sample with an
industrial balance to the nearest 0.1% of its total mass; check the result with the total
mass indicated on the label. If the result is less than the value on the label (not
exceeding 1%) and it can be ascertained that there is no sample loss during
transportation, then the mass reduced shall be regarded as that of the lost moisture.
1 "Causes no obvious moisture loss" means that the determination result of total moisture in
crushed coal samples, through examination, shows no significant difference from that
before crushing or shows difference but with very-small confidence range.
7.2 Method B (single-stage method)
7.2.1 Method B1 (drying under nitrogen)
7.2.1.1 Use a weighing bottle to weigh and take quickly (10~12)g of coal sample
with particle size smaller than 6mm (accurate to 0.001g), which has been pre-dried
and weighed; spread evenly.
7.2.1.2 Unlid the bottle; put it into an oven (5.2) which has been aerated with dry
nitrogen and preheated at (105~110)°C. Dry the bitumite for 2h, and lignite and blind
coal for 3h.
7.2.1.3 Remove the weighing bottle; put the lid on immediately; place it in air for
about 5min. Put it in a dryer; cool it to ambient temperature (for about 20min); reweigh
the bottle (accurate to 0.001g).
7.2.1.4 Conduct drying inspections, with 30min for every one, until each mass
reduction in two continuous inspections is less than 0.01g or the mass increases. In
the latter case, the mass of the previous inspection shall be adopted as the reference
for calculation.
7.2.2 Method B2 (drying in air)
7.2.2.1 Determination of total moisture in coal sample with particle size smaller than
13mm
7.2.2.1.1 Use a tray to weigh and take quickly (500 ± 10)g (accurate to 0.1g) of coal
sample with particle size smaller than 13mm, which has been pre-dried and weighed;
spread evenly.
7.2.2.1.2 Put the tray in an air drying oven which has been preheated to
(105~110)°C; dry the bitumite for 2h, and blind coal for 3h while blasting.
7.2.2.1.3 Remove the tray and weigh it (accurate to 0.1g) while hot.
7.2.2.1.4 Conduct drying inspection, with 30min for every time, until each mass
reduction in two continuous inspections is less than 0.5g or the mass increases. In the
latter case, the mass of the previous inspection shall be adopted as the reference for
calculation.
7.2.2.2 Determination of total moisture in coal sample with particle size smaller than
6mm
Except that the nitrogen-flushed oven is replaced by the air drying oven, the
procedures are the same as that in 7.2.1.
7.2.3 Result calculation
Total moisture in coal shall be calculated according to Formula (4);
The test report shall include the following information.
a) Sample No.;
b) Standard applied;
c) Result calculation;
d) Deviation to the standard;
e) Observed abnormal phenomena in testing;
f) Date of test.
Appendix A
(Normative)
Determination of Total Moisture in Coal by Method C
(Dryi...
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