GB/T 211-2017 PDF English
US$135.00 · In stock · Download in 9 secondsGB/T 211-2017: Determination of total moisture in coal Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 211: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 211-2017 | English | 135 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Determination of total moisture in coal
| Valid |
| GB/T 211-2007 | English | 70 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Determination of total moisture in coal
| Obsolete |
| GB/T 211-1996 | English | 239 |
Add to Cart
|
2 days
|
Determination of total moisture in coal
| Obsolete |
| GB 211-1984 | English | 199 |
Add to Cart
|
2 days
|
Determination of total moisture in coal
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 211-2017
GB/T 211-2017: Determination of total moisture in coal---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/GBT211-2017
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
the loss in mass at each of the two stages in accordance with the samples.
3.1.2 Method A2.drying in air
Weigh-take a certain amount of 13mm coal samples; dry them in the environment
where the temperatures are lower than 40°C, until the constant mass is reached.
Crush the samples into maximum particle size of 3mm;
3.2 Method B (single-stage method)
3.2.1 Method B1.drying under nitrogen
Weigh-take a certain amount of 6mm coal samples (or 13mm); dry them under
nitrogen at (105~110) °C, until the constant mass is reached. Calculate the total
moisture from the loss in mass in accordance with the samples.
4 Reagent and Materials
4.1 Anhydrous calcium chloride. chemically pure and granular.
4.2 Allochronic silica gel. industrial products.
4.3 Nitrogen. purity ≥ 99.9%, the oxygen content < 0.01%.
4.4 Tray. made from enamel, stainless steel, galvanized iron or aluminum plate, heat
resistant and corrosion resistant materials; the specification shall be able to
accommodate 500g sample, and the load per unit-area shall not exceed 1g/cm2.
4.6 Sampling instrument. applicable to 13mm or 6mm sample, and the opening size
shall be at least 3 times of the corresponding particle size.
5 Apparatus
5.1 Air-drying oven. with devices for automatic temperature control and air blow,
with inlet and outlet for air, capable of being controlled at (30~40)°C and (105~110)°C,
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.
5.6 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.
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)
of 13mm coal sample; spread it evenly; dry it in an air drying oven at ambient
temperature not exceeding 40°C, until the constant mass is reached (with continuous
drying for 1h and mass variation not exceeding 0.5g); record the mass (accurate to
0.1g). If an air drying oven is to be used, the coal sample shall be placed in laboratory
environment until it reaches moisture equilibrium again.
7.1.2 Inherent moisture (Method A1, drying under nitrogen)
7.1.2.1 After the determination of free moisture, immediately crush the sample into
maximum particle size of 3mm. Use a pre-dried and weighed weighing bottle to
weigh-take 9g~11g (accurate to 0.001g) of the sample; spread it evenly.
7.1.3 Inherent moisture (Method A2, drying in air)
Except that the nitrogen-flushed oven is replaced by the air-drying oven, the other
procedures are the same as that in 7.1.2.
7.1.4 Result calculation
The total moisture in coal shall be calculated in accordance with Formula (3);
7.2 Method B (single-stage method)
7.2.1 Method B1 (drying under nitrogen)
7.2.1.1 Use a pre-dried and weighed weighing bottle to quickly weigh-take (10~12)g
of 6mm coal sample (accurate to 0.001g); spread it evenly.
7.2.1.2 Open the lid of bottle; put it into an oven which has been aerated with dry
nitrogen and preheated to (105~110)°C. For bitumite, dry for 2h; for lignite and blind
coal, dry for 3h.
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.
7.2.3 Result calculation
Total moisture in coal shall be calculated in accordance with Formula (4);
7.4 Moisture loss correction during the preparation
If the coal sample is air dried before the preparation of the total moisture sample,
which leads to a mass loss of the coal sample, then, the value of corrected total
moisture shall be calculated in accordance with Formula (6).
8 Precision of the Methods
Repeatability limits of the determination of total moisture are specified in Table 1.
9 Test Report
The test report shall include at least the following information.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 211-2017 be delivered?Answer: The full copy PDF of English version of GB/T 211-2017 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 211-2017_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 211-2017_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 211-2017 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 211-2017?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 211-2017 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 211-2017?A step-by-step guide to download PDF of GB/T 211-2017_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 211-2017".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|