1、Designation:D679111Standard Test Method forDetermination of Grain Stability of Calcined PetroleumCoke1This standard is issued under the fixed designation D6791;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision
2、.A number 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 test method covers a laboratory vibration millmethod for the determination of the grain stability of calcinedpetroleum coke for th
3、e manufacture of carbon products used inthe smelting of aluminum.Calcined petroleum coke with poormechanical strength may become degraded during mixing.Poor grain stability will affect the grain size and may result inpoor quality of baked blocks.1.2 The values stated in SI units are to be regarded a
4、sstandard.No other units of measurement 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 app
5、lica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisD2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalD6969 Pra
6、ctice for Preparation of Calcined Petroleum CokeSamples for AnalysisD6970 Practice for Collection of Calcined Petroleum CokeSamples for AnalysisE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 ISO Standard:3ISO 6375 Carbonaceous Materials for the Production ofAluminumCoke for Elec
7、trodesSampling3.Terminology3.1 Definitions:3.1.1 calcined petroleum coke,npetroleum coke that hasbeen thermally treated to drive off the volatile matter and todevelop crystalline structure.3.1.2 petroleum coke,nsolid,carbonaceous residue pro-duced by thermal decomposition of heavy petroleum fraction
8、s,or cracked stocks,or both.4.Summary of Test Method4.1 A representative sample of calcined petroleum coke isdried and screened to a 4 to 8 mm fraction.The resultantsample is weighed so that two separate portions of 100.0 6 0.5g mass are obtained.The samples are place into the laboratorymill and gro
9、und for a specified period of time.After grindingthe sample is screened and the mass of the+4 mm material isdetermined.The grain stability is the percent of the originalmaterial remaining on the+4 mm sieve.5.Significance and Use5.1 The grain stability of calcined petroleum coke deter-mines the resis
10、tance to breakdown of+4 mm particles used inthe manufacture of carbon anodes for use in the reductionprocess of aluminum.5.2 Calcined petroleum cokes have to be relatively easy togrind for fines production but strong enough to withstandforming pressures and thermal stresses occurring when theanodes
11、are used in the reduction process.6.Interferences6.1 No material normally applied to the calcined petroleumcoke is found to cause analytical interference with this proce-dure.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the
12、 direct responsibility ofSubcommittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved June 1,2011.Published July 2011.Originally approvedin 2002.Last previous edition approved in 2006 as D679106.DOI:10.1520/D6791-11.2For referenced ASTM standards,visit the A
13、STM 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/
14、www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Apparatus7.1 Analytical Balance,accurate to 60.1 g.7.2 Rifflers,with hoppers and closures.7.3 Wire Sieves,8 mm
15、(516in.)and 4 mm(5 mesh),meetingSpecification E11.7.4 Laboratory Vibration Mill4,having two grindingvessels,each filled with 1 kg of clean,hard steel balls,diameter10 6 0.4 mm.The main features of the mill are shown in Figs.1-5.7.4.1 The mill and drive motor are mounted on a commonbase plate.The gri
16、nding vessels are installed in the body of themill,which is supported by four soft,flat springs.The springsuspension system is designed to allow the machine to beoperated without any fastenings or anchorage.The grindingvessels are secured by adjustable straps which have a quick-release catch.The oscillator is supported on a bearing,fitted tothe body of the mill,and is driven by the motor by way of aspecial clutch and a hollow flexible shaft.7.4.2 The peak-to-peak amplitude of the vibration shall