1、Designation: C737 08C737 13Standard 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
2、in parentheses 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 as dust in coal mines to prevent reduce risk of coal dust explosions.NOTE 1Limestone can
3、 serve as a source of incombustible material in coal mine operations. Limestone is dusted onto coal exposures in sufficientamount so that not less than 65 % of all loose dust shall be limestone incombustible material. In return air courses the concentration of incombustiblematerials should be not le
4、ss than 80 % of the total dust (MSHA 30 CFR 75.403). With such a concentration of limestone incombustible material, dustexplosions cannot initiate or be propagated from nearby gas explosions. The limestone must be substantially dry in order to dust satisfactorily.1.2 This standard does not purport t
5、o address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.3 The values stated in inch-pound units are to be r
6、egarded as standard. No other 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, Packaging, and Marking of Lime and Limestone Prod
7、uctsC110 Test Methods for Physical Testing of Quicklime, Hydrated Lime, and LimestoneC1271 Test Method for X-ray Spectrometric Analysis of Lime and LimestoneC1301 Test Method for Major and Trace Elements in Limestone and Lime by Inductively Coupled Plasma-Atomic EmissionSpectroscopy (ICP) and Atomic
8、 Absorption (AA)3. Chemical Composition3.1 Limestone shall conform to the following as to chemical composition:COLSPEC/colnum=“1“Moisture (at point of manufacture), max, % 0.5Silica, free and combined, max, % 4.04. Physical Properties4.1 Limestone for this application shall have the following partic
9、le size:Passing a No. 20 (850-m) sieve, min, % 100Passing a No. 200 (75-m) sieve, min, % 70Passing 850 m (No. 20) sieve, min, % 100Passing 75 m (No. 200) sieve, min, % 705. Test Methods5.1 Chemical AnalysisThe chemical analysis of the limestone shall be conducted in accordance with Test Methods C25,
10、C1271, or C1301.5.2 Particle SizeThe sieve analysis of limestone shall be conducted in accordance with Test Methods C110.1 This specification is under the jurisdiction of ASTM Committee C07 on Lime and is the direct responsibility of Subcommittee C07.02 on Specifications and Guidelines.Current editi
11、on approved Dec. 1, 2008Dec. 1, 2013. Published January 2009January 2013. Originally approved in 1973. Last previous edition approved in 20022008 asC737 02.C737 08. DOI: 10.1520/C0737-08.10.1520/C0737-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Ser
12、vice at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previo
13、us version. Becauseit 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 versionof the standard as published by ASTM is to be considered the official document.*A Summary of Chang
14、es section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. General Requirements6.1 Either high calcium or dolomitic limestone may be furnished for this application.7. Sampling, Inspection, etc.7.1
15、 The sampling, inspection, rejection, retesting, packaging, and marking shall be conducted in accordance with Methods C50.8. Keywords8.1 coal mines; dolomitic limestone; high calcium limestone; limestone; limestone dust; mine explosions; moisture content;silica contentSUMMARY OF CHANGESCommittee C07
16、 has identified the location of selected changes to this specification since the last issue,C737 02C737 08, that may impact the use of this specification. (Approved Dec. 1, 2013December 1, 2008)(1) Revised Note 1.(1) Revised 1.1.(2) Added Test Methods C1271 and C1301 to Section 2 and 5.1.(3) Revised
17、 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 this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights
18、, 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 years andif not revised, either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional sta
19、ndardsand 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 Com
20、mittee on Standards, at the address shown below.This standard is copyrighted 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C737 132
