ASTM D4749-1987(2012) Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size《进行煤和特定煤粒度筛选分析的标准试验方法》.pdf
《ASTM D4749-1987(2012) Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size《进行煤和特定煤粒度筛选分析的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4749-1987(2012) Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size《进行煤和特定煤粒度筛选分析的标准试验方法》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D4749 87 (Reapproved 2012)Standard Test Method forPerforming the Sieve Analysis of Coal and Designating CoalSize1This standard is issued under the fixed designation D4749; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method covers
3、 procedures for determining thesieve analysis of coal and designating the size of coal fromsieve analysis data. Raw as well as prepared (crushed, cleanedor screened) coals can be tested by this test method.1.2 This test method explains how to designate coal sizesfrom the results of sieve analysis da
4、ta in order to represent thecondition of the coal as sold. In the case of special mixtures orcoals with noncontinuous ranges of sizes, a sufficiently com-plete sieve analysis must be made to properly describe the sizedistribution.1.3 This test method is not applicable for determining thesieve analys
5、is nor for designating the size of pulverized coal.(See Note 1.) Size fractions down to and including 38 m (No.400 U.S.A. Standard Series) can be treated by the methodsdiscussed in this test method. Methods for handling sizefractions below 38 m (No. 400) will be developed by thiscommittee.NOTE 1For
6、powdered or pulverized coal as is fired into steam boilers,refer to Test Method D197.1.4 The values stated in SI units are to be regarded asstandard. The values given in parentheses are for informationonly. The values stated in each system may not be exactequivalents; therefore, each system must be
7、used indepen-dently of the other, without combining values in any way.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the
8、 applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D197 Test Method for Sampling and Fineness Test ofPulverized CoalD346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisD388 Classification of Coals by RankD2013 Practice for
9、 Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalD3302 Test Method for Total Moisture in CoalD4371 Test Method for Determining the Washability Char-acteristics of CoalE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE323 Specification fo
10、r Perforated-Plate Sieves for TestingPurposes2.2 Other Document:Specification C-80 Commonwealth of Pennsylvania, Depart-ment of General Services, Bureau of Purchases, Specifi-cation for Coal:Anthracite33. Descriptions of Terms Specific to this Standard3.1 as-mined coalsame as ROM coal (3.8).3.2 as-s
11、hipped or produced coalraw or prepared coal inany state or condition at which it leaves the mine property orloading facility.3.3 bottomsize, nominalthe sieve designating the lowerlimit or bottomsize shall be that sieve of the series given inSection 6 with the largest openings through which passes at
12、otal of less than 15 % of the sample. This defined bottomsizeis not to be confused with the size of the smallest particles inthe lot. (WarningIn the case of a commercial, double-screened product, for example, 37.5 by 9.5 mm (112 by38 in.),1This test method is under the jurisdiction of ASTM Committee
13、 D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.07 on PhysicalCharacteristics of Coal.Current edition approved Sept. 1, 2012. Published November 2012. Originallyapproved in 1987. Last previous edition approved in 2007 as D474987 (2007).DOI: 10.1520/D4749-87R12.2For referenc
14、ed ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Commonwealth of Pennsylvania, Dept. of General Services,Bu
15、reau of Purchases, 414 N. Office Building, Harrisburg, PA 17125.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1this designation may not be valid. In such commercial orcontractual situations, the amount of allowable materialsmaller th
16、an the bottomsize (for example, 9.5 mm) must bespecified by the contract under which the coal is bought andsold.)3.4 dry sievingfor the purposes of this test method, the testmethod for the sieving of coal after the sample has beenair-dried under prescribed conditions; this is generally usedwhen test
17、ing with coal particles larger than 600 m. (No. 30U.S.A. Standard Sieve Series.)3.5 openingfor the purpose of this test method, openingsand apertures shall be regarded as synonomous terms. Dimen-sions for round and square openings shall be determined asfollows: for round holes, dimensions shall refe
18、r to the openingdiameter; for square holes, dimensions shall refer to thedistance between parallel wires.3.6 prepared coalany coal, regardless of its topsize, thathas been manually or mechanically cleaned. This includes coalthat has been processed over a picking table or air tables,through a breaker
19、, jig, or other device which segregatesaccording to size or density (specific gravity).3.7 raw coalany coal, regardless of its topsize, that hasnot been manually or mechanically cleaned. Crushed coal thathas not been mechanically cleaned (including coal that has notbeen through a breaker which norma
20、lly rejects oversize) isconsidered to be raw coal. Coal delivered to the surface froman underground mine is considered to be raw coal even whencrushing and grinding is done underground. Coal removedfrom the pit of a surface mine is considered to be raw coal evenwhen breaking and crushing facilities
21、are provided in the pit.3.8 run-of-mine (ROM) coalin the case of an undergroundmine, it is that coal delivered to the surface by a slope belt,hoist, etc. In the case of a surface mine, it is that coal as it existsafter it has been removed from the pit and placed into the initialmeans of transportati
22、on whether it be an on-the-road oroff-the-road haul truck, dump hopper which feeds a pit-to-plantconveyor, etc. For both underground and surface mines, ROMcoal is as-mined and has not been exposed to any treatmentsuch as breaking, crushing, or cleaning except for that done bythe normal operations us
23、ed to extract the coal from the ground,that is, blasting, ripping, loading, cutting, etc.3.9 topsize, nominalthe sieve designating the upper limitor topsize shall be that sieve of the series given in Section 6with the smallest openings upon which is cumulatively retaineda total of less than 5 % of t
24、he sample. This defined topsize isnot to be confused with the size of the largest particle in the lot.3.10 wet sievingfor the purposes of this test method, thetest method for the sieving of coal that uses water as a mediumfor facilitating the segregation of the sample into particle sizes;this is gen
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