1、Designation:D241515Standard Test Method forAsh in Coal Tar and Pitch1This standard is issued under the fixed designation D2415;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 parentheses indicate
2、s the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the ashcontent of tar and pitch.1.2 The values stated in SI units are to be regarded asstandard.No other units of measureme
3、nt are included in thisstandard.1.3 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
4、 prior to use.2.Referenced Documents2.1 ASTM Standards:2D850 Test Method for Distillation of Industrial AromaticHydrocarbons and Related MaterialsD4296 Practice for Sampling PitchE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Method3.1 The sample is carefully volat
5、ilized and burned in amuffle furnace or by other suitable means,after which thecarbonaceous residue is completely oxidized and the remainingash stabilized at 900 C in the muffle furnace.4.Significance and Use4.1 This test method determines the amount of inorganicmatter in the sample.5.Apparatus5.1 M
6、uffle FurnaceA muffle furnace with good air circu-lation and capable of having its temperature regulated at900 C 6 10 C.5.2 Dish or Crucible,porcelain,silica,or platinum,havinga capacity of 35 mL to 45 mL and a diameter at the top of55 mm to 60 mm.5.3 Sieve,U.S.Standard 600 m(No.30),conforming toSpe
7、cification E11.6.Bulk Sampling6.1 Samples from shipments shall be taken in accordancewith Practice D4296 and shall be free of foreign substances.Thoroughly mix the sample immediately before removing arepresentative portion for the determination or for dehydration.7.Dehydration of Sample7.1 Hard Pitc
8、hIf the solid bulk sample contains freewater,air-dry a representative portion in a forced draft oven at50 C.7.2 Soft PitchIf the presence of water is indicated bysurface foam on heating,maintain a representative portion ofthe bulk sample at a temperature between 125 C and 150 C inan open container u
9、ntil the surface is free of foam.Take carenot to overheat,and remove heat source immediately whenfoam subsides.7.3 TarDehydrate a representative portion of the bulksample in accordance with Test Method D850,but stop thedistillation when the temperature reaches 170 C.Separate anyoil from the water wh
10、ich has distilled over(if crystals arepresent,warm sufficiently to ensure their solution),and thor-oughly mix the oil with the residual tar in the still after thelatter has cooled to a moderate temperature.8.Preparation of Working Sample8.1 Hard PitchIf the pitch can be crushed at roomtemperature,pr
11、epare a 20 g working sample by suitablecrushing,mixing,and quartering of a representative portion ofthe dry sample.The crushing can be done with a small jawcrusher and a mullite mortar and pestle.No particle in therepresentative sample shall be larger than 5 mm in any dimen-sion.Crush this sample so
12、 that all of it will pass the 600 m(No.30)sieve.8.2 Soft PitchIf the pitch is too soft to grind and too stickyto mix,heat a representative portion of the dry sample to thelowest temperature that will permit passage through the1This test method is under the jurisdiction of ASTM Committee D02 onPetrol
13、eum Products,Liquid Fuels,and Lubricantsand is the direct responsibility ofSubcommittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved Dec.1,2015.Published December 2015.Originallyapproved in 1965.Last previous edition approved in 2012 as D2415 98(2012).DOI
14、:10.1520/D2415-15.2For 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 Changes section appears at the end
15、 of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 600 m(No.30)sieve,taking care to avoid excessive loss ofvolatile matter.Do not exceed 10 min for this melting period.Pass the heated sample through the 600 m sieve to remove
16、foreign matter.8.3 TarHeat a representative portion of the dry tar to thelowest temperature that will permit passage through the600 m(No.30)sieve,then filter through this sieve to removeforeign matter.8.4 Preservation of SamplesStore samples as large lumpsor as solidified melts in closed containers.Do not save crushedsamples for future analyses since changes in compositionsometimes occur in pulverized pitch.9.Procedure9.1 Ignite a clean dish or crucible for 1 h in the mufflefurnace at 900 C 6 10
