BS 6043-3 6-2000 Methods of sampling and test for carbonaceous materials used in aluminium manufacture - Electrodes - Determination of electrical resistivity of cathode blocks and .pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 6043-3.6:2000 ISO 1171

2、3:2000 ICS 71.100.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Methods of sampling and test for carbonaceous materials used in aluminium manufacture Part 3: Electrodes Section 3.6: Determination of electrical resistivity of cathode blocks and prebaked anodes at ambient t

3、emperatureThis British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 October 2000 BSI 10-2000 ISBN 0 580 36585 9 BS 6043-3.6:2000 Amendments issued since

4、 publication Amd. No. Date Comments National foreword This British Standard reproduces verbatim ISO 11713:2000 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee CII/24, Raw materials for the aluminium industry, which has the r

5、esponsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.

6、 A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Inter

7、national Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a

8、British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 4, an inside back cover and a back cover. The BSI copyright notice displayed in th

9、is document indicates when the document was last issued.INTERNATIONAL STANDARD ISO 11713 Firstedition 2000-05-15 Referencenumber ISO11713:2000(E) Carbonaceousmaterialsusedinthe productionofaluminiumCathodeblocks andbakedanodesDeterminationof electricalresistivityatambienttemperature Produits carbons

10、 utiliss pour la production de laluminium Blocs cathodiques et anodes cuites Dtermination de la rsistivit lectrique la temprature ambiante BS 6043-3.6:2000ii BS 6043-3.6:2000 iii Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISO memberbod

11、ies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcom- mittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhasthe righttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliai- sonwithISO,als

12、otakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission (IEC)onallmattersofelectrotechnicalstandardization. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3. DraftInternationalStandardsadoptedbythetechnicalcommitteesarecirculat

13、edtothememberbodiesforvoting. PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote. AttentionisdrawntothepossibilitythatsomeoftheelementsofthisInternationalStandardmaybethesubjectof patentrights.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrigh

14、ts. InternationalStandardISO11713waspreparedbyTechnicalCommitteeISO/TC47, Chemistry, Subcommittee SC7, Aluminium oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium in- dustry. BS 6043-3.6:2000BS 6043-3.6:2000 1 Carbonaceousmaterialsusedintheproductionofalum

15、inium CathodeblocksandbakedanodesDeterminationofelectrical resistivityatambienttemperature 1Scope ThisInternationalStandardspecifiesamethodforthedeterminationoftheelectricalresistivityofcathodeblocksand bakedanodesusedintheproductionofaluminium,usingsamplesatambienttemperature. 2Normativereferences

16、Thefollowingnormativedocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsof thisInternationalStandard.Fordatedreferences,subsequentamendmentsto,orrevisionsof,anyofthese publicationsdonotapply.However,partiestoagreementsbasedonthisInternationalStandardareencouragedto invest

17、igatethepossibilityofapplyingthemostrecenteditionsofthenormativedocumentsindicatedbelow.For undatedreferences,thelatesteditionofthenormativedocumentreferredtoapplies.MembersofISOandIEC maintainregistersofcurrentlyvalidInternationalStandards. ISO8007-1:1999, Carbonaceous materials used in the product

18、ion of aluminium Sampling plans and sampling from individual units Part 1: Cathode blocks. ISO8007-2:1999, Carbonaceous materials used in the production of aluminium Sampling plans and sampling from individual units Part 2: Prebaked anodes. 3Principle Afixed,constantdirectcurrentispassedthroughasamp

19、leofgivencross-section.Thevoltagedropbetweensen- sorsismeasuredandtheelectricalresistivityiscalculated. 4 Apparatus 4.1Drillingmachine,equippedwithadiamond-tippeddrill. 4.2Cutter,withadiamond-coateddisk. 4.3Slidecalliper,accurateto . 4.4Ammeter,accurateto . 4.5Potentiometer,ordigitalvoltmeter,classo

20、faccuracyIEC . 4.6Sampleclampingdevice,equippedwithacurrentsupplyandvoltagesensorswhichmaybepointsorblades witharadiusofcurvaturenotlessthan .Forbladesthesensorsshallbeperpendiculartotheaxisofthe sample. 4.7Oven,capableofbeingmaintainedat . 0,5% 0,5% 0,5% 200 m (110 5) C BS 6043-3.6:20002 4.8Apparat

21、usforthedeterminationofelectricalresistivity,(seeFigure1)inwhichthecontactsurfacebe- tweenthecurrentsupplyandthesamplehasaratioof where isthediameterofthecurrentsupplycontactor; isthediameterorwidthofthesample; and thedistanceofthevoltagesensorsfromtheedgeofthesampleisgreaterthan ,andatleast ; thedi

22、stancebetweenthevoltagesensorsisgreaterthan ,andatleast ; thecontactforceofthecontactorofthecurrentsupplyisnotlessthan ; thecontactforceofthevoltagesensorsonthespecimenisnotlessthan . 5Sampling SamplethecathodeblocksandbakedanodesinaccordancewithISO8007-1andISO8007-2. Key 1Testspecimen 2 Currentsupp

23、lycontactor 3 Voltagesensors Figure1Principleforresistivitymeasurements d D 2 3 d D 0,5D 30mm 0,8D 40mm 50N 0,5N F=Forceof50N BS 6043-3.6:2000 3 6Procedure 6.1Preparationofspecimens Notethedirectionofsampling(seeISO8007-2:1999)andtaketestsamplesofcylindricalorcuboidshapewiththe followingminimumdimen

24、sions.Alldimensionsshallbegreaterthanorequaltothreetimesthemaximumparticle sizeofthedryaggregate: diameterofacylindricalsample: minimum; or squarecross-section: minimum; lengthofthesample: minimum; variationofthecross-sectioninthemeasuringzone: max. Drythesampleintheoven(4.7)at foratleast ,thenleave

25、tocool. 6.2Determination Cleanthecurrentcontactorandthevoltagesensorstoensureoptimumelectricalcontact. Determinethemeandiameterormeansideofthespecimenwiththeslidecalliper(4.3)inthevicinityofthevoltage sensorsontwoperpendiculardiametersinthecaseofacylinderandonthefoursidesincaseofacuboid. Determineth

26、edistance,betweenthepointsofthevoltagesensorstowithin . Placethetestspecimenbetweenthecurrentcontactorsandapplyforceof soastoensureoptimumdistribution ofcurrent. Adjustthedirectcurrentsoastoobtainacurrentdensitywhichisnotgreaterthan . Putthevoltagesensorsintoplace. Measurethecurrentanddifferenceinvo

27、ltageonthefourradiiofthecylinderoronthefoursidesofthecuboidby rotatingthetestspecimen . Ensurethatthetimeduringwhichthecurrentpassesthroughthetestissufficientlyshorttopreventanydetectable changeinresistance. 7Calculation Theresistivityofthespecimen,expressedinmicro-ohmmetres,isgivenbytheequation whe

28、re isthedifferenceinvoltage,involts,overlength; istheareaofthecross-section,insquarecentimetres,ofthetestspecimen; isthecurrentintensity,inamperes; isthedistance,incentimetres,betweenthevoltagesensors. 30mm 30mm 30mm 100mm 0,5% (110 5) C2h l 0,5% 50N 1A=cm 2 90 = UA Il 10 4 Ul A I l BS 6043-3.6:2000

29、4 Calculatetheresulttothenearestintegerforvaluesgreaterthan andtoonedecimalplaceforvaluesless than . 8Precision 8.1Repeatability, 8.2Reproducibility, 9Testreport Thetestreportshallcontainthefollowinginformation: a)acompleteidentificationofthetestsample; b)areferencetothisInternationalStandard,i.e.IS

30、O11713; c)theresultsandtheunitsinwhichtheyareexpressed; d)anyunusualfeaturesnotedduringthedetermination; e)anyoperationsnotincludedinthisInternationalStandardorintheInternationalStandardstowhichreferenceis made,orregardedasoptional. 20 m 20 m r r=1,2 m R R=1,5 m BS 6043-3.6:2000BS 6043-3.6:2000 ISO

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