1、Designation: C 737 02Standard 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers limestone suitable for use asdust in coal mines to prevent coal dust explosions.NOTE 1In coal mine operations, limestone
3、 is dusted onto coalexposures in sufficient amount so that not less than 65 % of all loose dustshall be limestone. With such a concentration of limestone, explosionscannot initiate or be propagated from nearby gas explosions. Thelimestone must be substantially dry in order to dust satisfactorily.1.2
4、 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 applica-bility of regulatory limitations prior to use.2. Referenced Docu
5、ments2.1 ASTM Standards:C 25 Test Methods for Chemical Analysis of Limestone,Quicklime, and Hydrated Lime2C 50 Methods for Sampling, Inspection, Packaging, andMarking of Lime and Limestone Products2C 110 Test Methods for Physical Testing of Quicklime,Hydrated Lime, and Limestone23. Chemical Composit
6、ion3.1 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 have the followingparticle size:Passing a No. 20 (850-m) sieve, min, % 100Passin
7、g 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 MethodsC 25.5.2 Particle SizeThe sieve analysis of limestone shall beconducted in accordance with Test Methods C 110.6. General Requirements6.1 Ei
8、ther 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 withMethods C 50.8. Keywords8.1 coal mines; dolomitic limestone; high calcium lime-s
9、tone; 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 C07.03 on Industrial Uses.Current edition approved Dec. 10, 2002. Published January 2003. Origi
10、nallyapproved in 1973. Last previous edition approved in 1997 as C 73797.2Annual Book of ASTM Standards, Vol 04.01.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes no position respecting the validity of any pa
11、tent rights asserted in 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 revisio
12、n at any time by the responsible technical committee and must be reviewed every five years 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 com
13、ments 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 copyright
14、ed by ASTM International, 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).C737022
