GB/T 35059-2018Determination on reabsorbed water of upgraded coal (English PDF)
提质煤复吸水分测定方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 14, 2018
Implementation date
September 1, 2018
Scope
GB/T 35059-2018 is the English-translated version of 提质煤复吸水分测定方法.
GB/T 35059-2018 gives a laboratory method for measuring how much moisture upgraded low-rank coal takes back up after it has been dried. A coal sample below 6 mm, of at least 1.25 kg, is prepared under GB/T 474 or GB/T 19494.2 and mixed in a sealed container.
A 10 g to 12 g portion is then weighed into an open weighing bottle and held at 30.0 °C, either in a constant-temperature cabinet over saturated potassium chloride solution or in a constant-temperature and constant-humidity cabinet set to 83% relative humidity, and its mass is recorded over time.
The standard also covers the reagents, the instruments, the expression of results, the method precision and the test report, with an example report in an annex. It was issued on 14 May 2018 and has applied since 1 September 2018.
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Document preview — GB/T 35059-2018
National Standard of the People's Republic of China
- ICS
- 73.040
- Classification
- D 21
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Terms and Definitions4
- 4 Method Summary5
- 5 Reagents5
- 6 Instruments and Equipment5
- 7 Coal Sample Preparation6
- 8 Test Procedure6
- 9 Result Expression7
- 10 Method Precision7
- 11 Test Report8
- Appendix A (Informative) An Example of Test Report on Reabsorbed Water of Upgraded Coal9
1 Scope
This Standard specifies the terms and definitions, method summary, reagents, instruments and equipment, coal sample preparation, test procedure, result expression, method precision and test report of determination on reabsorbed water of upgraded coal.
This Standard is applicable to the determination on reabsorbed water of upgraded low-rank coal.
2 Normative References
The following documents are indispensable to the application of this Standard. In terms of references with a specified date, only versions with a specified date are applicable to this Standard. The latest version (including all the modifications) of references without a specified date is also applicable to this Standard.
GB/T 211-2017 Determination of Total Moisture in Coal
GB/T 474 Method of Preparation of Coal Sample
GB/T 19494.2 Mechanical Sampling of Coal - Part 2. Method for Sample Preparation
GB/T 35062 Terms on Low Rank Coal Upgrading Technology
3 Terms and Definitions
Terms and definitions that are defined in GB/T 35062 are applicable to this document.
In order to make it convenient for usage, some terms and definitions in GB/T 35062 are listed out again as follows.
3.1 Upgraded Coal
Upgraded coal refers to coal products that are obtained through certain upgrading and processing technology. [GB/T 35062-2018, Definition 3.3]
3.2 Reabsorption
6 Instruments and Equipment
6.5 Analytical balance. division value. 0.001 g.
7 Coal Sample Preparation
In accordance with the stipulation in GB/T 474 or GB/T 19494.2, prepare coal sample whose granularity is less than 6 mm and mass not less than 1.25 kg. Before weighing-taking the coal sample, thoroughly mix up coal sample in the sealed container. The duration of mixing shall be not less than 1 min.
8 Test Procedure
8.1 Pre-test Preparation
8.1.1 Pre-test preparation of test using constant-temperature cabinet. prepare potassium chloride saturated solution. add 200 mL of distilled water or deionized water into 90 g of potassium chloride. After thoroughly mixing it up, transfer it into a 500 mL beaker; reserve for later usage.
8.1.2 Pre-test preparation of test using constant-temperature and constant-humidity cabinet. add sufficient distilled water or deionized water into the constant-temperature and constant-humidity water cabinet.
8.2 Stabilize Test Environment
Set the temperature of the constant-temperature cabinet or the constant-temperature and constant-humidity cabinet to 30.0 °C; set the relative humidity of the constant-temperature and constant-humidity cabinet to 83%. When test is conducted using the constant-temperature cabinet, place the previously prepared potassium chloride saturated solution into the constant-temperature zone of the constant-temperature cabinet. Before test, the duration of stabilization shall be not less than 1 h.
8.3 Weigh Coal Sample
Weigh-take 10 g ~ 12 g of test coal sample (accurate to 0.001 g) whose granularity is less than 6 mm. The mass of the coal sample shall be marked as m1. Promptly place it into the previously weighed weighing bottle; evenly lay the coal sample in the weighing bottle.
8.4 Place Coal Sample
Open the cap of the weighing bottle; place the weighing bottle into the constant-temperature cabinet or the constant-temperature and constant-humidity cabinet.
8.5 Coal Sample Mass Record
2 h after placing the weighing bottle into the constant-temperature cabinet or the […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 19494.2-2023 — Mechanical sampling of coal - Part 2: Method for sample preparation
GB/T 211-2017 — Determination of total moisture in coal
GB/T 35062-2018 — Terms on low rank coal upgrading technology
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