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Designation: C737 – 97 - Standard Specification for Limestone for Dusting of Coal Mines1

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This standard is issued under the fixed designation C 737; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. | Designation C 737 97 Standard Specification for Limestone for Dusting of Coal Mines1 This standard is issued under the fixed d ii r atic n c 737 the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. 1. Scope 1.1 This specification covers lilm l ti lXl suiiablc for use as dust in coal mines to prevent coal dust explosions. Note 1 In coal nine operations limestone is dusted onto coal exposures in sufficient amount so that not less than 65 of all loose dust shall be limestone. With such a concentration of limestone explosions cannot initiate or be propagated from nearby gas explosions. The limestone must be substantially dry in order to dust satisfactorily. 2. Referenced Documents 2.1 ASTM Standards C 25 Test Methods for Chemical Analysis of Limestone Quicklime and Hydrated Lime2 C 50 Methods for Sampling Inspection Packing and Marking of Lime and Limestone Products2 C 110 Test Methods for Physical Testing of Quicklime Hydrated Lime and Limestone2 3. Chemical Composition 3.1 Limestone shall conform to the following as to chemical composition 1 This specification is under the lur.sdictĩon. of ASTM CommitStete C-7 on Lime and is the direct responsibility of Subcommittee C07.03 on Industrial Uses. Current edition approved June 10 1997. Published June 1998. Originally published as C 737-73. Last previous edition C 131 -91. Annual Book of ASTM Standards Vol 04.01. Moisture at point of manufacture max 0.5 Silica free and combined max 4.0 4. Physical Properties 4.1 Limestone for this application shall have the following fineness Passing a No. 20 850-pm sieve min 100 Passing a No. 200 75-pm sieve min 70 5. Test Methods 5.1 Chemical Analysis The chemical malbi iti off the iimc-stone shall be made in accordance with Test Methods C 25. .