1、Designation:D635498 (Reapproved 2008) Designation: D6354 12Standard Guide forSampling Plan and Core Sampling of Carbon CathodeBlocks Used in Aluminum Production1This standard is issued under the fixed designation D6354; the number immediately following the designation indicates the year oforiginal a
2、doption or, in the case of revision, the year of last revision. 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 guide covers sampling of carbon cathode blocks used in the prod
3、uction of aluminum, and details procedures for takingtest samples from single cathode blocks. It covers equipment and procedures for obtaining samples from cathode blocks in amanner that does not destroy the cathode block or prevent its subsequent use as originally intended. However, the user mustde
4、termine the subsequent use of the sampled cathode blocks. Preferred locations for taking samples from single units of cathodeblocks are covered in this guide.1.1.1 Information for sampling of shaped refractory products, in general, is given in ISO 5022. This standard details thestatistical basis for
5、 sampling plans for acceptance testing of a consignment or lot. Cathode blocks used in the production ofaluminum have specific requirements of sampling, and while the statistical basis for sampling given in ISO 5022 applies, furtheror modified requirements may also apply.1.2 The values stated in SI
6、units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to 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
7、 practices and determine the applicability of regulatorylimitations prior to use.NOTE 1The following ASTM standards are noted as sources of useful information: Test Methods C559, C611, C651, C747, C1025, C1039, andC1225.2. Referenced Documents2.1 ASTM Standards:2C559 Test Method for Bulk Density by
8、Physical Measurements of Manufactured Carbon and Graphite ArticlesC611 Test Method for Electrical Resistivity of Manufactured Carbon and Graphite Articles at Room TemperatureC651 Test Method for Flexural Strength of Manufactured Carbon and Graphite Articles Using Four-Point Loading at RoomTemperatur
9、eC747 Test Method for Moduli of Elasticity and Fundamental Frequencies of Carbon and Graphite Materials by SonicResonanceC1025 Test Method for Modulus of Rupture in Bending of Electrode GraphiteC1039 Test Methods for Apparent Porosity, Apparent Specific Gravity, and Bulk Density of Graphite Electrod
10、esC1225 Specification for Fiber-Cement Roofing Shingles, Shakes, and Slates2.2 ISO Standards:3ISO 8007-1 Carbonaceous materials used in the production of aluminum - Cathodic blocks - Sampling plan and sampling fromsingle cathodic blocksISO 5022 Shaped refractory products - Sampling and acceptance te
11、sting3. Terminology3.1Definitions: Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 blocka carbon cathode, a single unit. cathode block, none manufactured unit used as a negative carbon electrode.1This guide is under the jurisdiction of ASTM Committee D02 on Petroleum Products and
12、 Lubricants and is the direct responsibility of Subcommittee D02.05 onProperties of Fuels, Petroleum Coke and Carbon Material.Current edition approved Oct.April 15, 2008.2012. Published December 2008.May 2012. Originally approved in 1998. Last previous edition approved in 20032008 asD635498(20038).
13、DOI: 10.1520/D6354-98R08.10.1520/D6354-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3Available from A
14、merican National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.1This 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 previous version. Becauseit may not b
15、e 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 Changes section appears at the end o
16、f this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.2 samplethe portion of carbon obtained from a cathode. sample, na portion of carbon obtained from a cathode block.3.1.3 test specimenan article prepared from a sample
17、. test specimen, na representative piece of a sample.4. Significance and Use4.1 Core sampling is an acceptable way of obtaining a test specimen without destroying the usefulness of a cathode block.4.1.1 Test specimens obtained by this guide can be used by producers and users of cathode blocks for th
18、e purpose of conductingthe tests in Note 1 to obtain comparative physical properties.4.2 Sampling shall not weaken the cathode block or increase the likelihood of premature failure. Extreme care shall be exercisedwhen taking vertically drilled samples.5. Apparatus5.1 Core Drill Bit, similar to that
19、shown in Fig. 1, driven by suitable equipment. Use bits with cutting teeth coated with diamondor other extremely hard material.6. Procedure6.1 Sampling locations for cathode blocks that were vibrated, pressed, or extruded without a collector bar slot will differ fromthose cathode blocks that were fo
20、rmed with collector bar slots.6.1.1 For cathode blocks without collector bar slots, samples shall be drilled from the part of the cathode block that will bemachined out for the slot, as shown in Fig. 2. Care is to be taken to ensure that cores drilled vertical to the slot do not penetratebeyond the
21、depth of the slot.6.1.2 For cathode blocks with collector bar slots, samples shall be drilled from the cathode block, as shown in Fig. 3. If the userdetermines that cathode blocks with sample holes drilled in them cannot be used in the electrolysis process, then it will benecessary to obtain a numbe
22、r of cathode blocks with the extra length, as shown in Fig. 3. The extra length will then have to beremoved prior to cathode block use.6.2 Dimensions of a cored test sample will depend upon the test that is to be performed on the sample. The minimum dimension(usually the diameter) shall be at least
23、three times the maximum particle size of the dry aggregate used in the manufacture of thecathode block. Reference should be made to the standards relating to the tests to be performed to ensure that the samples takenare to suitable dimensions.FIG. 1 Typical Core Drill BitD6354 1226.2.1 The specific
24、dimensions of the test specimens to be tested are normally given in the appropriate ASTM standard. Wherea standard does not specify the dimensions of the test specimen, a diameter of 30 or 50 mm is recommended. The length of thetest specimens should be at least one and a half times the diameter.6.3
25、Place the core drill bit firmly against the cathode block. Take care to maintain the bit level and true. Do not stop until thebit is embedded its full length. Compressed air can be used to cool the drill bit and remove dust while drilling. Do not use wateror other liquids to cool the drill bit.6.3.1
26、 To remove the bit, pull and twist it by hand, or carefully withdraw the drill bit while it is rotating. To remove the coresample, insert a wedge between it and the cathode block until the core snaps.7. Report7.1 The sampling report shall include the following:7.1.1 Names of producer and customer,7.
27、1.2 Manufacturers identification of the lot or batch of cathode blocks being sampled,7.1.3 Reference to this guide,7.1.4 Date and place of sampling,7.1.5 If extra length cathode blocks were available for sampling, the proportion and number are to be noted,7.1.6 Sketches, similar to those in Fig. 2 a
28、nd Fig. 3, showing the location of the sampling locations and the direction of sampling(horizontally or vertically),7.1.7 The dimensions of the tests samples,7.1.8 Identification of the people doing the sampling, andFIG. 2 Sampling from Single Units Produced Without SlotFIG. 3 Sampling from Single U
29、nits Produced with SlotD6354 1237.1.9 Complete details of sampling plan being followed.8. Keywords8.1anthracite; carbon; cathodes; core; graphite; sample; sampling; test specimens8.1 anthracite; carbon; cathodes; core; graphite; sample; sampling; test specimensSUMMARY OF CHANGESSubcommittee D02.05 h
30、as identified the location of selected changes to this standard since the last issue(D635498(2008) that may impact the use of this standard.(1) Updated Section 3.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this st
31、andard. 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 revision at any time by the responsible technical committee and must be rev
32、iewed 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 comments will receive careful consideration at a meeting of theresponsi
33、ble 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 copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West C
34、onshohocken, 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/).D6354 124
