1、Designation: C 737 08Standard Specification forLimestone for Dusting of Coal Mines1This standard is issued under the fixed designation C 737; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in pa
2、rentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers limestone suitable for use asdust in coal mines to prevent coal dust explosions.NOTE 1Limestone can serve as a source of
3、 incombustible material incoal mine operations. Limestone is dusted onto coal exposures insufficient amount so that not less than 65 % of all loose dust shall belimestone incombustible material. In return air courses the concentrationof incombustible materials should be not less than 80 % of the tot
4、al dust(MSHA 30 CFR 75.403). With such a concentration of limestoneincombustible material, dust explosions cannot initiate or be propagatedfrom nearby gas explosions. The limestone must be substantially dry inorder to dust satisfactorily.1.2 This standard does not purport to address all of thesafety
5、 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 applica-bility of regulatory limitations prior to use.1.3 The values stated in inch-pound units are to be regardedas standard. No o
6、ther units of measurement are included in thisstandard.2. Referenced Documents2.1 ASTM Standards:2C25 Test Methods for Chemical Analysis of Limestone,Quicklime, and Hydrated LimeC50 Practice for Sampling, Sample Preparation, Packag-ing, and Marking of Lime and Limestone ProductsC110 Test Methods for
7、 Physical Testing of Quicklime,Hydrated Lime, and Limestone3. Chemical Composition3.1 Limestone shall conform to the following as to chemicalcomposition:Moisture (at point of manufacture), max, % 0.5Silica, free and combined, max, % 4.04. Physical Properties4.1 Limestone for this application shall h
8、ave the followingparticle size:Passing a No. 20 (850-m) sieve, min, % 100Passing a No. 200 (75-m) sieve, min, % 705. Test Methods5.1 Chemical AnalysisThe chemical analysis of the lime-stone shall be conducted in accordance with Test MethodsC25.5.2 Particle SizeThe sieve analysis of limestone shall b
9、econducted in accordance with Test Methods C110.6. General Requirements6.1 Either high calcium or dolomitic limestone may befurnished for this application.7. Sampling, Inspection, etc.7.1 The sampling, inspection, rejection, retesting, packag-ing, and marking shall be conducted in accordance withMet
10、hods C50.8. Keywords8.1 coal mines; dolomitic limestone; high calcium lime-stone; limestone; limestone dust; mine explosions; moisturecontent; silica content1This specification is under the jurisdiction of ASTM Committee C07 on Limeand is the direct responsibility of Subcommittee C07.02 on Specifica
11、tions andGuidelines.Current edition approved Dec. 1, 2008. Published January 2009. Originallyapproved in 1973. Last previous edition approved in 2002 as C 737 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book
12、of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.SUMMARY OF CHANGES
13、Committee C07 has identified the location of selected changes to this specification since the last issue,C 737 02, that may impact the use of this specification. (Approved December 1, 2008)(1) Revised Note 1.ASTM International takes no position respecting the validity of any patent rights asserted i
14、n connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the r
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16、eful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Internation
17、al, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C737082
