ASTM D3173-03(2008)
(Test Method)Standard Test Method for Moisture in the Analysis Sample of Coal and Coke
Standard Test Method for Moisture in the Analysis Sample of Coal and Coke
SIGNIFICANCE AND USE
Moisture as determined by this test method is used for calculating other analytical results to a moisture free basis using procedures in Practice D 3180. Moisture percent determined by this test method may be used in conjunction with the air-dry moisture loss determined in Method D 2013 and Test Method D 3302 to determine total moisture in coal. Total moisture is used for calculating other analytical results to “as received” basis using Practice D 3180. Moisture, ash, volatile matter, and fixed carbon percents constitute the proximate analysis of coal and coke.
SCOPE
1.1 This test method covers the determination of moisture in the analysis sample of coal or coke. It is used for calculating other analytical results to a dry basis. When used in conjunction with the air drying loss as determined in accordance with Method D 2013 or Practice D 346, each analytical result can be calculated to an as-received basis:
1.2 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:D3173–03 (Reapproved 2008)
Standard Test Method for
Moisture in the Analysis Sample of Coal and Coke
This standard is issued under the fixed designation D3173; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope matter, and fixed carbon percents constitute the proximate
analysis of coal and coke.
1.1 Thistestmethodcoversthedeterminationofmoisturein
the analysis sample of coal or coke. It is used for calculating
5. Analysis Sample
other analytical results to a dry basis. When used in conjunc-
5.1 The analysis sample is that sample which has been
tion with the air drying loss as determined in accordance with
pulverized to pass 250-µm (No. 60) sieve as prepared in
Method D2013 or Practice D346, each analytical result can be
accordance with Practice D346 or Method D2013.
calculated to an as-received basis:
1.2 This standard does not purport to address all of the
6. Apparatus
safety concerns, if any, associated with its use. It is the
6.1 Drying Oven, for coal samples:
responsibility of the user of this standard to establish appro-
6.1.1 Fordeterminingthemoistureofcoal,theovenshallbe
priate safety and health practices and determine the applica-
so constructed as to have a uniform temperature in all parts,
bility of regulatory limitations prior to use.
have a minimum of air space, and be capable of temperature
regulation between the limits of 104 and 110°C. It may be of
2. Referenced Documents
theformshowninFig.1.Provisionshallbemadeforrenewing
2.1 ASTM Standards:
the preheated air in the oven at the rate of two to four times a
D346 Practice for Collection and Preparation of Coke
minute, with the air dried as defined in 7.1.
Samples for Laboratory Analysis
6.1.2 In the oven shown in Fig. 1, the door should contain a
D2013 Practice for Preparing Coal Samples for Analysis
hole of approximately 3.2 mm ( ⁄8 in.) in diameter near the
D3180 Practice for Calculating Coal and Coke Analyses
bottom to permit a free flow of air through the oven space.
from As-Determined to Different Bases
6.2 Drying Oven, for coke samples. For determining the
D3302 Test Method for Total Moisture in Coal
moisture of coke, an ordinary drying oven with openings for
3. Summary of Test Method natural air circulation and capable of temperature regulation
between limits of 104 and 110°C may be used.
3.1 Moisture is determined by establishing the loss in
6.3 Capsules,withcovers.Aconvenientform,whichallows
weight of the sample when heated under rigidly controlled
the ash determination to be made on the same sample, is a
conditions of temperature, time and atmosphere, sample
7 3
porcelain capsule, 22 mm ( ⁄8 in.) in depth and 44 mm (1 ⁄4 in.
weight, and equipment specifications.
) in diameter, or a fused silica capsule of similar shape. These
4. Significance and Use capsules shall be used with a well-fitting flat aluminum cover,
illustrated in Fig. 2. Platinum crucibles or glass capsules with
4.1 Moisture as determined by this test method is used for
ground-glasscapsmayalsobeused.Theyshouldbeasshallow
calculating other analytical results to a moisture free basis
as possible, consistent with convenient handling.
using procedures in Practice D3180. Moisture percent deter-
mined by this test method may be used in conjunction with the
7. Reagents
air-dry moisture loss determined in Method D2013 and Test
7.1 Dry Air—Air used to purge the drying oven should be
Method D3302 to determine total moisture in coal. Total
dried to a moisture content of 1.9 mg/L or less. (Dew
moisture is used for calculating other analytical results to “as
point−10°C or less.)Any desiccant or drying method capable
received” basis using Practice D3180. Moisture, ash, volatile
of achieving this degree of dryness is suitable.
7.2 Desiccants—Materials suitable for use in the desiccator
This test method is under the jurisdiction of ASTM Committee D05 on Coal
may be chosen from the following:
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
7.2.1 Anhydrous Calcium Sulfate (0.004 mg/L).
Analysis.
7.2.2 Silica Gel.
Current edition approved Feb. 1, 2008. Published February 2008. Originally
approved in 1973. Last previous edition approved 2003 as D3173–03. DOI: 7.2.3 Magnesium Perchlorate (0.0005 mg/L).
10.1520/D3173-03R08.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D3173–03 (2008)
8.3 Afterremovingthecovers,quicklyplacethecapsulesin
a preheated oven (at 104 to 110°C) through which passes a
current of dry air. (The current of dry air is not necessary for
coke.) Close the oven at once and heat for 1 h. Open the oven,
cover the capsules quickly, cool in a desiccator over desiccant,
andweighassoonasthecapsuleshavereachedroomtempera-
ture.
8.4 Use the percentage of moisture in the sample passing a
250-µm (No. 60) sieve to calculate the results of the other
analyses to a dry basis.
9. Calculations
9.1 Calculate the percent moisture in the analysis sample as
follows:
Moistureinanalysissample,% 5[~A 2 B!/A] 3100 (1)
where:
A = grams of sample used and
B = grams of sample after heating.
10. Precision and Bias
10.1 Precision—The precision of this method for the deter-
NOTE 1—Details in U.S. Bureau of Mines Bulletin No. 492, 1951, p 6.
minationofmoistureintheanalysissampleo
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D3173–02 Designation:D3173–03 (Reapproved 2008)
Standard Test Method for
Moisture in the Analysis Sample of Coal and Coke
This standard is issued under the fixed designation D3173; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the determination of moisture in the analysis sample of coal or coke. It is used for calculating other
analytical results to a dry basis. When used in conjunction with the air drying loss as determined in accordance with Method
D2013 or Practice D346, each analytical result can be calculated to an as-received basis:
1.2 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.
2. Referenced Documents
2.1 ASTM Standards:
D346 Practice for Collection and Preparation of Coke Samples for Laboratory Analysis
D2013Method of Practice for Preparing Coal Samples for Analysis
D3180 Practice for Calculating Coal and Coke Analyses from As-Determined to Different Bases
D3302 Test Method for Total Moisture in Coal
3. Summary of Test Method
3.1 Moisture is determined by establishing the loss in weight of the sample when heated under rigidly controlled conditions of
temperature, time and atmosphere, sample weight, and equipment specifications.
4. Significance and Use
4.1 Moisture as determined by this test method is used for calculating other analytical results to a moisture free basis using
procedures in Practice D3180. Moisture percent determined by this test method may be used in conjunction with the air-dry
moisture loss determined in Method D2013 and Test Method D3302 to determine total moisture in coal. Total moisture is used
forcalculatingotheranalyticalresultsto“asreceived”basisusingPracticeD3180.Moisture,ash,volatilematter,andfixedcarbon
percents constitute the proximate analysis of coal and coke.
5. Analysis Sample
5.1 Theanalysissampleisthatsamplewhichhasbeenpulverizedtopass250-µm(No.60)sieveaspreparedinaccordancewith
Practice D346 or Method D2013.
6. Apparatus
6.1 Drying Oven, for coal samples:
6.1.1 For determining the moisture of coal, the oven shall be so constructed as to have a uniform temperature in all parts, have
a minimum of air space, and be capable of temperature regulation between the limits of 104 and 110°C. It may be of the form
shown in Fig. 1. Provision shall be made for renewing the preheated air in the oven at the rate of two to four times a minute, with
the air dried as defined in 7.1.
6.1.2 IntheovenshowninFig.1,thedoorshouldcontainaholeofapproximatelyin.(3.2mm)3.2mm( ⁄8in.)indiameternear
the bottom to permit a free flow of air through the oven space.
6.2 Drying Oven, for coke samples. For determining the moisture of coke, an ordinary drying oven with openings for natural
air circulation and capable of temperature regulation between limits of 104 and 110°C may be used.
6.3 Capsules,withcovers.Aconvenientform,whichallowstheashdeterminationtobemadeonthesamesample,isaporcelain
7 3
capsule, in. (22 mm)22 mm ( ⁄8 in.) in depth and 44 mm (1 ⁄4 in. (44 mm)) in diameter, or a fused silica capsule of similar shape.
This test method is under the jurisdiction ofASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.21 on Methods ofAnalysis.
Current edition approved Oct. 10, 2002. Published January 2003. Originally approved in 1973. Last previous edition approved 2002 as D3173–02.
Current edition approved Feb. 1, 2008. Published February 2008. Originally approved in 1973. Last previous edition approved 2003 as D3173–03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D3173–03 (2008)
NOTE 1—Details in U.S. Bureau of Mines Bulletin No. 492, 1951, p 6.
FIG. 1 Moisture Oven
Thesecapsulesshallbeusedwithawell-fittingflataluminumcover,illustratedinFig.2.Platinumcruciblesorglasscapsuleswith
ground-glass caps may also be used. They should be as shallow as possible, consistent with convenient handling.
7. Reagents
7.1 Dry Air—Air used to purge the drying oven should be dried to a moisture content of 1.9 mg/L or less. (Dew point−10°C
or less.) Any desiccant or drying method capable of achieving this degree of dryness is suitable.
7.2 Desiccants—Materials suitable for use in the desiccator may be chosen from the following:
7.2.1 Anhydrous Calcium Sulfate (0.004 mg/L).
7.2.2 Silica Gel.
7.2.3 Magnesium Perchlorate (0.0005 mg/L).
7.2.4 Sulfuric Acid, Concentrated (0.003 mg/L).
7.2.5 The desiccant must be kept fresh enough to assure that the air in the desiccator is dry as defined in 7.1. Values in
parentheses ( ) are literature values for the residual amount of moisture in air at equilibrium with these desiccants. ( Warning:
Sulfuric acid is corrosive and can cause severe damage to eyes, skin, and clothing. Magnesium perchlorate is a strong oxidant and
can react violently with organic materials.)
8. Procedure for Sample Passing a 250-µm (No. 60) Sieve
8.1 Heat the empty capsules under the conditions at which the sample is to be dried, place the stopper or co
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