ASTM D7582-10e1
(Test Method)Standard Test Methods for Proximate Analysis of Coal and Coke by Macro Thermogravimetric Analysis
Standard Test Methods for Proximate Analysis of Coal and Coke by Macro Thermogravimetric Analysis
SIGNIFICANCE AND USE
Moisture, as determined by this instrumental test method, is used for calculating other analytical results to a dry basis using procedures in Practice D3180.
Moisture can be used in conjunction with the air-dry moisture loss determined by Test Method D3302 to determine total moisture in coal. Total moisture is used for calculating other analytical results to an as-received basis using Practice D3180.
Ash yield is the residue remaining after heating the coal and coke samples (see Note 1).
Note 1—The ash obtained differs in composition and amount from the mineral constituents present in the original coal. Combustion causes an expulsion of all water, the loss of carbon dioxide from carbonates, the conversion of iron pyrite into iron oxides and sulfur oxides, and other chemical reactions. Ash yield, as determined by this test method, can differ from the amount of ash produced in furnace operations or other combustion systems because combustion conditions influence the chemistry and amount of ash.
Ash yield is used, (1) as a parameter for evaluating sampling procedures and coal cleaning processes, (2) in the ultimate analysis calculation of oxygen by difference using Practice D3176, (3) in calculations including material balance, reactivity and yields of products relevant to coal conversion processes such as gasification and liquefaction, (4) in calculations to estimate the loading on electrostatic precipitators and on the fly ash and bottom ash disposal systems as well as erosion rates on boiler systems.
Volatile matter yield, when determined as herein described, may be used to (1) indicate coke yield on carbonization, (2) provide the basis for purchasing and selling, or (3) establish combustion characteristics.
Fixed carbon is a calculated value. It is the difference between 100 and the sum of the percent moisture, ash, and volatile matter. All percents shall be on the same moisture reference base.
Moisture, ash, and volatile matter are three of the...
SCOPE
1.1 These instrumental test methods cover the determination of moisture, volatile matter, and ash, and the calculation of fixed carbon in the analysis of coal and coke samples prepared in accordance with Practice D2013 and Practice D346.
1.2 These instrumental test methods are not applicable to thermogravimetric analyzers using microgram size samples.
1.3 Test Methods D3173, D3174, and D3175 shall be considered the referee test methods.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D7582 − 10
StandardTest Methods for
Proximate Analysis of Coal and Coke by Macro
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Thermogravimetric Analysis
This standard is issued under the fixed designation D7582; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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´ NOTE—13.2.3 was editorially corrected in December 2011.
1. Scope D3176 Practice for Ultimate Analysis of Coal and Coke
D3180 Practice for Calculating Coal and Coke Analyses
1.1 Theseinstrumentaltestmethodscoverthedetermination
from As-Determined to Different Bases
of moisture, volatile matter, and ash, and the calculation of
D3302 Test Method for Total Moisture in Coal
fixed carbon in the analysis of coal and coke samples prepared
D5016 Test Method for Total Sulfur in Coal and Coke
in accordance with Practice D2013 and Practice D346.
Combustion Residues Using a High-Temperature Tube
1.2 These instrumental test methods are not applicable to
Furnace Combustion Method with Infrared Absorption
thermogravimetric analyzers using microgram size samples.
E691 Practice for Conducting an Interlaboratory Study to
1.3 Test Methods D3173, D3174, and D3175 shall be Determine the Precision of a Test Method
considered the referee test methods.
3. Terminology
1.4 The values stated in SI units are to be regarded as
3.1 For definitions of terms used in this test method, refer to
standard. No other units of measurement are included in this
Terminology D121.
standard.
1.5 This standard does not purport to address all of the
4. Summary of Test Method
safety concerns, if any, associated with its use. It is the
4.1 In thermogravimetric analysis the mass of a sample in a
responsibility of the user of this standard to establish appro-
controlled atmosphere is recorded repeatedly as a function of
priate safety and health practices and determine the applica-
temperature or time, or both. In macro thermogravimetric
bility of regulatory limitations prior to use.
analysis a sample size of approximately 1 g is used. All mass
2. Referenced Documents
measurements are conducted by the system. In a typical
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analysis, the temperature is normally ramped from ambient to
2.1 ASTM Standards:
a specific temperature and held at that temperature for a
D121 Terminology of Coal and Coke
prescribed length of time. The mass change is recorded
D346 Practice for Collection and Preparation of Coke
repeatedly during the entire procedure. For the thermogravi-
Samples for Laboratory Analysis
metric analysis of coal and coke samples the moisture and ash
D2013 Practice for Preparing Coal Samples for Analysis
analyses are complete when the sample reaches a constant
D3173 Test Method for Moisture in the Analysis Sample of
mass as defined in the instrumental operating parameters.
Coal and Coke
Alternatively, the measurement of moisture and ash can be
D3174 Test Method forAsh in theAnalysis Sample of Coal
considered complete after heating the sample for a fixed period
and Coke from Coal
oftime.Inthevolatilematteranalysis,thesamplesareweighed
D3175 Test Method for Volatile Matter in the Analysis
after heating to 950°C and held at this temperature for 7 min.
Sample of Coal and Coke
4.2 Moisture is determined by measuring the loss in mass of
the analysis specimen of coal or coke when heated under
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This test method is under the jurisdiction of ASTM Committee D05 on Coal
specified conditions of temperature, time, atmosphere, speci-
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
Analysis.
men mass, and equipment specifications.
CurrenteditionapprovedJune1,2010.PublishedJuly2010.Originallyapproved
4.3 Volatile matter is determined by measuring the loss in
in 2009. Last previous edition approved in 2009 as D7582-09. DOI: 10.1520/
D7582–10E01.
mass of the analysis specimen of coal or coke when heated
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
under rigidly controlled conditions. The measured mass loss is
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
used to calculate the volatile matter after correcting for the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. moisture content.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7582 − 10
4.4 Ash is determined by measuring the mass of the residue 5.5 Volatile matter yield, when determined as herein
remaining after burning the coal or coke specimen under described, may be used to (1) indicate coke yield on
specified conditions o
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