1、Designation:C73713Standard Specification forLimestone for Dusting of Coal Mines1This standard is issued under the fixed designation C737;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 parenthese
2、s 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 reduce risk of coal dust explosions.NOTE1Limestone can serve as a source of incom
3、bustible 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 total dust(MSHA
4、 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 concerns,if an
5、y,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 other units of measu
6、rement 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,Packaging,and Marking of Lime and Limestone ProductsC110 Test Methods for Physical Testing of Quic
7、klime,Hydrated Lime,and LimestoneC1271 Test Method for X-ray Spectrometric Analysis ofLime and LimestoneC1301 Test Method for Major and Trace Elements in Lime-stone and Lime by Inductively Coupled Plasma-AtomicEmission Spectroscopy(ICP)and Atomic Absorption(AA)3.Chemical Composition3.1 Limestone sha
8、ll 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 have the followingparticle size:Passing 850 m(No.20)sieve,min,%100Passing 75 m(No.200)sieve,min,%705.Test Met
9、hods5.1 Chemical AnalysisThe chemical analysis of the lime-stone shall be conducted in accordance with Test Methods C25,C1271,or C1301.5.2 Particle SizeThe sieve analysis of limestone shall beconducted in accordance with Test Methods C110.6.General Requirements6.1 Either high calcium or dolomitic li
10、mestone may befurnished for this application.7.Sampling,Inspection,etc.7.1 Thesampling,inspection,rejection,retesting,packaging,and marking shall be conducted in accordance withMethods C50.8.Keywords8.1 coal mines;dolomitic limestone;high calcium lime-stone;limestone;limestone dust;mine explosions;m
11、oisturecontent;silica content1This specification is under the jurisdiction of ASTM Committee C07 on Limeand is the direct responsibility of Subcommittee C07.02 on Specifications andGuidelines.Current edition approved Dec.1,2013.Published January 2013.Originallyapproved in 1973.Last previous edition
12、approved in 2008 as C737 08.DOI:10.1520/C0737-13.2For referenced 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.*A Summary of Cha
13、nges section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 SUMMARY OF CHANGESCommittee C07 has identified the location of selected changes to this specification since the last issue,C737 08,that may im
14、pact the use of this specification.(Approved Dec.1,2013)(1)Revised 1.1.(2)Added Test Methods C1271 and C1301 to Section 2 and5.1.(3)Revised 4.1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of th
15、is 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 responsible technical committee and must be reviewed every five year
16、s andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your comments will receive careful 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 copy
