1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS ISO 923:2000 ICS 73.04
2、0 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Coal cleaning equipment Performance evaluationThis 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
3、 comes into effect on 15 September 2000 BSI 09-2000 ISBN 0 580 36474 7 BS ISO 923:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard reproduces verbatim ISO 923:2000 and implements it as the UK national standard. It supersedes BS 3620:1963 which i
4、s withdrawn. The UK participation in its preparation was entrusted to Technical Committee PTI/16, Solid mineral fuels, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals
5、for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement internation
6、al or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include al
7、l the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a 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 cov
8、er page, pages ii to iv, pages 1 to 32, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.Referencenumber ISO923:2000(E) INTERNATIONAL STANDARD ISO 923 Secondedition 2000-05-15 CoalcleaningequipmentPerformance evalu
9、ation quipement pour lpuration du charbon valuation des rsultatsISO923:2000(E) ii ISO923:2000(E)iii Contents Page Foreword.iv 1 Scope1 2 Normativereferences1 3 Termsanddefinitions.1 4 Performancecriteria2 5 Performanceparameters2 6 Performancetestprocedures.3 7 Analyticalprocedures.3 8 Expressionofp
10、erformance3 AnnexA(normative)Methodsofexpressingperformance4 AnnexB(normative)Recommendationsforstandardmethodsofpresentingcoalcleaningtestdata5 AnnexC(informative)Graphs29ISO923:2000(E) iv Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(IS
11、O memberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnical committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas therighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,in liaisonwi
12、thISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnical Commission(IEC)onallmattersofelectrotechnicalstandardization. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3. DraftInternationalStandardsadoptedbythetechnicalcommitteesar
13、ecirculatedtothememberbodiesforvoting. PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote. AttentionisdrawntothepossibilitythatsomeoftheelementsofthisInternationalStandardmaybethesubjectof patentrights.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchp
14、atentrights. InternationalStandardISO923waspreparedbyTechnicalCommitteeISO/TC27, Solid mineral fuels, SubcommitteeSC1, Coal preparation: Terminology and performance. Thissecondeditioncancelsandreplacesthefirstedition(ISO923:1975),whichhasbeentechnicallyrevised. AnnexesAandBformanormativepartofthisIn
15、ternationalStandard.AnnexCisforinformationonly.INTERNATIONALSTANDARD ISO923:2000(E)1 CoalcleaningequipmentPerformanceevaluation 1 Scope ThisInternationalStandarddescribestheprinciplesandmethodsforevaluatingtheperformanceofequipment usedforcleaningoperations.Testingandsamplingproceduresarespecifiedan
16、dmethodsofpresentingtest resultsaredetailed.Performanceparametersarerecommendedanddefinedandtheirdeterminationisformulated, therebyallowingtheiruseinevaluating,comparingandpredictingperformancelevelsofcleaningoperations. ThisInternationalStandardisapplicabletothefollowingtypesofcoalcleaningequipment
17、usingrelativedensityas themaincharacteristicforseparation: a) dense-mediumseparators; b) jigs; c) otherseparators. 2 Normativereferences Thefollowingnormativedocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsof thisInternationalStandard.Fordatedreferences,subsequentamend
18、mentsto,orrevisionsof,anyofthese publicationsdonotapply.However,partiestoagreementsbasedonthisInternationalStandardareencouragedto investigatethepossibilityofapplyingthemostrecenteditionsofthenormativedocumentsindicatedbelow.For undatedreferences,thelatesteditionofthenormativedocumentreferredtoappli
19、es.MembersofISOandIEC maintainregistersofcurrentlyvalidInternationalStandards. ISO1170, Coal and coke Calculation of analyses to different bases. ISO1213-1, Solid mineral fuels Vocabulary Part 1: Terms relating to coal preparation. ISO1953, Hard coal Size analysis by sieving. ISO1988, Hard coal Samp
20、ling. ISO5048, Continuous mechanical handling equipment Belt conveyors with carrying idlers Calculation of operating power and tensile forces. ISO7936, Hard coal Determination and presentation of float and sink characteristics General directions for apparatus and procedures. 3 Termsanddefinitions Fo
21、rthepurposesofthisInternationalStandard,thetermsanddefinitionsgiveninISO1213-1apply.ISO923:2000(E) 2 4 Performancecriteria Thefollowingcriteriaareused: a) thefeedrate,expressedonmassand/orvolumebasis; b) referencedensityofseparation; c) sharpnessofseparation; d) correctlyplacedandmisplacedmaterial;
22、e) asherrorandyielderror; f) thedegreeofdifficultyofseparation; g) materialcharacteristics. Theabovecriteriawillbeinfluencedbytestconditions,whichshouldthereforebefullyreported. Conditions,includingfeedrate,shouldbekeptuniform,monitoredandmaintainedwithinprescribedtolerancelimits duringatest. Wherep
23、erformancetestresultsareusedforprediction,processconditionsshouldbetakenintoaccount. 5 Performanceparameters Forthestandardexpressionofperformanceofacleaningoperation,determinethecriteriainclause4bythe followingparameters: a) thefeedrate,expressedonmassand/orvolumebasis; Keepthefeedrateasuniformaspo
24、ssiblethroughouttheperformancetestanddetermineitovertheduration ofthetestbythemostaccuratemethodavailable. Wherethefeedtotheequipmentisbybeltconveyor,determinethefeedrateinaccordancewithISO5048. b) thereferencedensityofseparation,preferablyexpressedasbothpartitiondensityandequal-errorscut-point (den
25、sity); c) thesharpnessofseparationexpressedintermsofprobableerrorandimperfection; d) thedistributionofcorrectlyplacedandincorrectlyplacedmaterialineachproduct,presentedgraphicallywith respecttorelativedensity,andtheparticularvalueofmisplacedmaterialineachproduct,determinedatthe referencedensityofsep
26、aration; e) theasherrorexpressedasthedifferencebetweentheactualashinthecleanedcoalandthetheoreticalashat theactualyieldvalue; f) theyielderrorexpressedasthedifferencebetweentheactualyieldandthetheoreticalyieldattheactual clean-coalashvalue; g) thedegreeofdifficultyofseparationexpressedintermsofnear-
27、densitymaterial(andbyotherrelevant characteristics).ISO923:2000(E)3 6 Performancetestprocedures Theequipmenttobetested,thefeedcomposition,andthemeansofhandlingthefeedandproducts,varywidely.A singleInternationalStandardtocoverallcasesisnotapplicable.Thefollowinggeneralproceduresshallbe followed. a) S
28、amplesshallbetakenfromthefeedandfromeachoftheproducts.Thesamplingtechniques,numberof incrementsandincrementmassshallensurethatallsamplestakenarerepresentativeandshallcomplywith existingInternationalStandardswhereavailable.SamplingofcoaliscoveredbyISO1988andsizeanalysisof coaliscoveredbyISO1953. Toen
29、ablecheckingofresultsandassessmentoftheeffectsofdegradation,representativesamplesshouldbe takenfromallrelevantstreamstoandfromtheequipmenttobetested. b) Itisessentialtodeterminethefeedrateandthepercentageyieldtoeachoftheproductsonadrybasisin accordancewithISO1170.Thisshouldbeachievedinaccordancewith
30、oneoftheproceduresgivenbelow. Determinethemassofeachproductbyoneormoreofthefollowingmethods,whicharelistedinorderofreliability. a) Bydirectweighingofthewholeofeachproductcollectedoverthedurationofthetestorthroughcontinuous weighingandintegrationoverthedurationofthetest. b) Bytakingregulartimedincrem
31、entsoverthedurationofthetest. c) Byweighingeachproductcollectedsimultaneouslyoveraselectedperiodofthetest. NOTE1 Ifitisfeasibletomeasureboththemassofthefeed(bybeltweigher,weighhopper,flowmeter,etc.)andthemass oftheproducts,thisprovidesacheck. NOTE2 Ifthemassofoneoftheproductscannotbeobtained,itmaybe
32、derivedfromamassbalancebetweenthefeedand otherproduct(s). NOTE3 Wherethesolidsareconveyedbyafluid,itmaybemoreconvenienttomakevolumetricmeasurements. Representativesamplesshouldbetakenfromstreamstodeterminemoisturecontentorconcentrationsofsolidsas appropriate,sothatresultscanbereportedonadrybasis. In
33、circumstancesthatpreventthedeterminationofyieldsbytheaboveprocedures,alternativeprocedures(e.g.ash balance)maybeused. 7 Analyticalprocedures ThemethodsandproceduresofsizeanalysisandfloatandsinkanalysisshallbeinaccordancewithISO1953and ISO7936,respectively. Thefeedsampleandeachoftheproductsamplesshou
34、ldbeseparatedintovariousparticlesizefractions dependingonthedegreeofdetailrequired.Becausetheperformanceofcoalcleaningequipmentisusually differentfordifferentsizeparticles,thesizerangesshouldbeasprescribedinISO7936. 8 Expressionofperformance Methodsfortheexpressionoftheresultsofcoalcleaningtestsandt
35、heperformanceoftheseparationprocesses aregiveninnormativeannexA. Forthepurposeofmeetingtherequirementsstatedinclause1,nosinglemethodsufficesbyitself. NormativeannexBdescribesrecommendedmethodsforthecalculationandtabulationoftestresults,andinformative annexCgivesgraphicalpresentations.ISO923:2000(E)
36、4 AnnexA (normative) Methodsofexpressingperformance Formula Derivedfrom Remarks A.1 Separationdensity a) Partitiondensity b) Equal-errorscut-point (density) Partitioncurves M-curves Washabilitycurves Describesonecharacteristicoftheseparation,butdoesnot indicateitsaccuracy A.2 Misplacedmaterial M-cur
37、ves Washabilitycurves Measureofquantityofmisplacedmaterial(withoutreference toitsquality)attheseparationdensity A.3 Totalofcorrectlyplaced material M-curves Washabilitycurves Measureofquantityofcorrectlyplacedmaterial(without referencetoitsquality)attheseparationdensity A.4 Asherror M-curves Washabi
38、litycurves Reflectsboththequantityandqualityofmisplacedmaterialin termsofthespecificpropertyofcoal(percentageofash)that theseparationisdesignedtocontrol;measuresqualitative efficiency A.5 Yielderror M-curves Washabilitycurves Reflectsboththequantityandqualityofmisplacedmaterial andmeasuresquantitati
39、veefficiency A.6 Organicefficiency M-curves Washabilitycurves Relatedtoyielderrorbutexpressedasapercentage A.7 Errorarea Partitioncurves Measureofquantityofmisplacedmaterialintermsofdensity A.8 Partitioncoefficients Partitioncurves Specialapplicationsonly A.9 cart probable (moyen) Partition curves G
40、ives an indication of the quantitative errors inherent in the separatingprocessatagivenseparationdensity A.10 Imperfection Partitioncurves Modificationof cart probable (moyen) to include effect of varyingseparationdensity.Notusedfordense-medium separators A.11 Yieldloss Productsamples Statesresultsw
41、ithoutreferencetoaccuracyofseparation NOTE1M-curvesandwashabilitycurvesdescribegraphicallythecharacteroftherawcoalandoftheproducts,intermsofmassandash. Partitioncurvesdescribeonlytheproductsintermsofmassanddensity;theycanbeconstructedwithoutthenecessitytodetermineash. NOTE2M-curveshavewiderdirectapp
42、licationsthanwashabilitycurves,especially,forexample,inthree-productseparations.The constructionofsuchcurvesisdescribedinISO7936. NOTE3The cart probable (moyen) and imperfection reflect the influence of changes in the separation process rather than in the raw coal, incontrasttotheformulaederivedfrom
43、M-curvesorwashabilitycurves,whichreflectchangesintherawcoalaswellasintheseparation process. NOTE4Theseparationdensity,althoughnotameasureofefficiency,isanimportantcharacteristicoftheseparationandisessentialtoany comprehensivestatementoftheresultsofagiventest. NOTE5Themisplacedmaterialandthetotalofco
44、rrectlyplacedmaterialattheseparationdensity,theasherror,theyielderror,theorganic efficiencyandtheerrorareacanallbeusedforguaranteetestsandoccasionalcontrolteststogiveanindicationoftheaccuracyofagiven separationonagivencoal,andhenceofeconomicefficiency;buttheyareoflittlevalueinthepredictionofprobable
45、resultsofcleaninga rangeofcoalsbyonespecificprocess. NOTE6Partitioncoefficients, cart probable (moyen) and imperfection are valuable for the purpose of prediction but do not give an adequateindicationoftheaccuracyofagivenseparatingoperationonaparticularcoal.ISO923:2000(E)5 AnnexB (normative) Recomme
46、ndationsforstandardmethodsofpresentingcoalcleaningtest data B.1Descriptionofthetables Twosetsoftablesarerequired(seeclausesB.4toB.7): a) forthree-productseparation(cleanedcoal,middlingsandreject); b) fortwo-productseparation(cleanedcoalandreject). Forconvenience,anidenticallayouthasbeenadoptedforbot
47、hsetsoftablesbut,inthoseintendedforusewith two-productseparations,thecolumnsthatrelateonlytothree-productseparationhavebeenleftblanktoavoid confusion. Eachsetoftablesispresentedintwoways. a) Blanktables,toshowthemethodofprinting(seeForm1andForm3inclausesB.4andB.6,respectively). b) Tablescompletedbyf
48、illinginthefiguresrelatingtotestresults.Forexample,Form2andForm4shownin clausesB.5andB.7givetheresultsofatestusingaBaumjigwasher. NOTE TheexampledescribedinthisannexwascarriedoutpriortothepublicationofISO7936.Theparticlesizesused thereforearenotinaccordancewiththosespecifiedinthatInternationalStanda
49、rd. Forthetestdescribedinthisexample,thewasherwassuppliedwithcoalsizedfrom152mmto0mm.Thefigures usedrefertothefractionsizedbetween12,7mmand0,5mm.Thefinematerialbelow0,5mmwasremovedfrom thesamplesbeforecarryingoutfloatandsinktests,becausethisfinematerialpresentsdifficultiesintesting. Moreover,thejigisnotexpectedtocleanmaterialsmallerthan0,5mm. Forafullanalysisofthetest,tablessimilartothosegivenforthe12,7mmto0,5mmsizewouldberequiredforthe othersizesoftherawcoal,inthisinstance152mmto51mm,51mmto25,4mm,and25,4mmto12,7mm.Such tableswouldenabletheperformanceon
