美卓_泡沫浮选系统fox5D

ProcessTechnologyACorrelationBetweenVisiofroth™MeasurementsandthePerformanceofaFlotationCellKymRunge,JaclynMcMasterMichaelWortley,DavidLaRosaOlivierGuyotCorrelationofVisiofrothParameterswithFlotationCellPerformance2ProcessTechnologyFrothVisionSystems-Operatoroftenmakesdecisionsbasedontheappearanceofthefrothandhowitflows-VisionsystemsenableustocapturethisinformationquantitativelyanduseinprocesscontrolstrategiesCorrelationofVisiofrothParameterswithFlotationCellPerformance3ProcessTechnologyVisioFrothTM•Algorithmscalculatefrothparameters-Quantifyhowfastthefrothismoving-Evaluatebubblesizedistributionandloading-Determineimagestabilityandfrothcollapserates-Quantifythefrothcolour-IndicateafrothtexturalchangeCorrelationofVisiofrothParameterswithFlotationCellPerformance4ProcessTechnologyVisioFrothTM:SoftwareDisplayCorrelationofVisiofrothParameterswithFlotationCellPerformance5ProcessTechnologyVisioFroth/OCSSystemVisioFroth/OCSSystemOCSOCS©©DCSDCSPLCPLCCorrelationofVisiofrothParameterswithFlotationCellPerformance6ProcessTechnologyVelocity•Modifiedfouriertransformtechniquecalculatesthedisplacementbetweentwoconsecutiveimages•Velocitymeasuredinboththexandydirections•Abilitytoprocess30frames/second•CommonlymeasuredtoassessandcontrolthemasspullratefromaflotationcellParametersMeasuredbyVisiofrothCorrelationofVisiofrothParameterswithFlotationCellPerformance7ProcessTechnologyBubbleSizeMeasurement•Watershedtechniquesusedtodelineatebubblecontoursandcalculatebubblesurfacearea•Measuredinrealtimeonallframes•Thesegmentedimageandbubblesizedistributionaredisplayedpictoriallywithinthesoftware•Abilitytotunewatershedalgorithmparameters•BubblesegmentationaffectedbycamerazoomsettingParametersMeasuredbyVisiofrothCorrelationofVisiofrothParameterswithFlotationCellPerformance8ProcessTechnologyColourandBrightnessDescriptors•Visiofrothanalysesasegmentoftheimageandcalculatestheparametersassociatedwiththreedifferentcolourmodels:-RGBColourCube-HSVColourModel-LabColourModel•Theaveragecolourdescriptorsoftheimagearereportedaswellastheproportionofpixelswithinasubsetofthecolourdescriptors.•LightingandreflectanceoffthebubblesaffectsvalueofcolourdescriptorsParametersMeasuredbyVisiofrothColourModelRepresentations(afterGonalezandWoods,2002andMoraretal,2005)CorrelationofVisiofrothParameterswithFlotationCellPerformance9ProcessTechnologyCollapseRate•Relativemeasureoftherateofbubblecoalescenceonthefrothsurface•Measuredasthepercentagechangeinbubblesurfaceareaperframepair•Relatedtothesizeandpresenceofbubbles•AffectedbyfrothvelocityParametersMeasuredbyVisiofrothCorrelationofVisiofrothParameterswithFlotationCellPerformance10ProcessTechnologyExperimentalTestwork(AMIRAP9Campaign)RougherFeedCleanerScavengerTailingRougherScavengerScavengerTailingRougherConcentrateScavengerConcentrateCollectorCollectorNASHFrother•1stRougher,3rdRougher,1stScavengerand3rdScavengercellsrunatthreedifferentairratesandfrothdepths•Feed,timedconcentrate,tailingandtopoffrothsamplescollectedateachcellcondition•Fiveto15minutesoffrothvisionrecordedusingaJVChandheldcameramountedaboveeachcellCorrelationofVisiofrothParameterswithFlotationCellPerformance11ProcessTechnologyMetallurgicalAssessmentofFlotationCellPerformance1stRougher01020304050602030405060CopperRecovery(%)CopperGrade(%)TopofFrothGradeConcentrateGrade(a)3rdScavenger0510152025303505101520CopperRecovery(%)CopperGrade(%)TopofFrothGradeConcentrateGrade(b)CorrelationofVisiofrothParameterswithFlotationCellPerformance12ProcessTechnologyMetallurgicalAssessmentofFlotationCellPerformance0.010.020.030.040.050.00.010.020.030.040.050.0WaterFlowtoConcentrate(%)ConcentrateGrade(%)Rougher1Rougher3Scavenger3Scavenger10.010.020.030.040.050.00.020.040.060.0TopofFrothGrade(%)ConcentrateGrade(%)Rougher1Rougher3Scavenger3Scavenger4CorrelationofVisiofrothParameterswithFlotationCellPerformance13ProcessTechnologyCorrelationsAssociatedwithFlow0.05.010.015.020.025.030.035.040.045.00.05.010.015.020.025.0FrothVelocity(cm/sec)Flow(TPH)SolidsWaterSolids+Water(a)0.05.010.015.020.025.030.035.040.00.02.04.06.08.010.0FrothVelocity(cm/sec)Flow(TPH)SolidsWaterSolids+Water(b)Rougher1Scavenger3•Flowbestcorrelatedwithfrothvelocity•RelationshipnotlinearCorrelationofVisiofrothParameterswithFlotationCellPerformance14ProcessTechnologyCorrelationsAssociatedwithFlow•Flowversusvelocityrelationshipchangesfromdaytoday0.05.010.015.020.025.030.035.00.02.04.06.08.010.012.0FrothVelocity(cm/sec)Flow(TPH)Solids8/8/2001Solids9/8/2001Water8/8/2001Water9/9/2001CorrelationofVisiofrothParameterswithFlotationCellPerformance15ProcessTechnologyProcessControlImplications•Appropriatetousefrothvelocitytocontrolmasspullrate•FrothvelocitycannotbeusedasameasureofmasspullrateCorrelationofVisiofrothParameterswithFlotationCellPerformance16ProcessTechnologyCorrelationsAssociatedwithGradeRougher1–40.9%Rougher3–25.5%Scavenger1–13.3%Scavenger3–2.7%CorrelationofVisiofrothParameterswithFlotationCellPerformance17ProcessTechnologyCorrelationBetweenGradeandColourParameters0.560.6325Labb0.420.4725Laba0.0680.05825LuminanceLab0.130.1025Value/Intensity0.190.3425Saturation0.640.6325HueHSV0.380.3925Blue0.0980.08025Red0.0240.01725GreenRGBColourCubeTopofFrothAssayConcentrateCopperAssayCorrelationCo-efficient(R2)NumberofObservationsParameterColourModelCorrelationofVisiofrothParameterswithFlotationCellPerformance18ProcessTechnologyCorrelationBetweenGradeandColourParameters0.020.040.060.080.0100.0120.0140.0160.00.010.020.030.040.050.060.0TopofFrothGrade(%)Hue(degrees)Rougher1Rougher3Scavenger1Scavenger3CorrelationofVisiofrothParameterswithFlotationCellPerformance19ProcessTechnologyCorrelationsBetweenGradeandBubbleSizeR2=0.7162R2=0.7951R2=0.47790.05.010.015.020.00.010.020.030.040.050.060.0CopperGrade(%)AverageBubbleSize(cm)ConGrade(Zoom1)(24observations)ConGrade(Zoom2)(30observations)TopofFrothGrade(Zoom2)(25observations)•Graderelatedtobubblesizemeasuredonsurface•Relationshipbettercorrelatedwithtopoffrothgrade•ZoomsettingaffectedbubblesizingmeasurementCorrelationofVisiofrothParameterswithFlotationCellPerformance20ProcessTechnologyCorrelationsBetweenGradeandCollapseRate•Gradebestcorrelatedwiththecollapserateparameter•Relationshipbettercorrelatedwithtopoffrothgrade•Zoomsettingdidn’taffectedcollapseratemeasurementR2=0.7931R2=0.90880.02.04.06.08.010.012.014.016.00.010.020.030.040.050.060.0CopperGrade(%)CollapseRate(%perframepair)ConGrade(Zoom1&2)(58observations)TopofFrothGrade(Zoom2)(25observations)CorrelationofVisiofrothParameterswithFlotationCellPerformance21ProcessTechnologyConcentrateGradePrediction0.010.020.030.040.050.00.010.020.030.040.050.0ActualConcentrateGrade(%)PredictedConcentrateGrade(%)Rougher1Rougher3Scavenger1Scavenger3cVelocitybRateCollapsea1aeconcentrat++=CorrelationofVisiofrothParameterswithFlotationCellPerformance22ProcessTechnologyProcessControlImplications•ConcentrategradeandtopoffrothgradewerewellcorrelatedwithparametersmeasurablebytheVisiofrothsystem•PotentialtousethesecorrelationswithinamodeltooptimisebankperformanceCorrelationofVisiofrothParameterswithFlotationCellPerformance23ProcessTechnologyConclusions•Visiofrothisasystemwhichmeasuresparametersthatarecorrelatedtoflotationcellperformance•Solidsandwaterflowfromaflotationcellarecorrelatedwithfrothvelocityandthuscanbeusedtoincreaseordecreasemasspullrateswithinaprocesscontrolstrategy•Topoffrothgradewascorrelatedwithbubblecollapserate•Concentrategradewasbestpredictedusingbothbubblecollapserateandavelocityterm•PotentialtouseVisiofrothtoestimateconcentratepurityforuseinaprocesscontrolstrategy•BubblecollapserateseemstobedependentsolelyonthegradeofattachedparticlesandnotmassloadingCorrelationofVisiofrothParameterswithFlotationCellPerformance24ProcessTechnologyFlotationProcessControlintheFuture•Predictionofconcentrategradeusingfrothproperties•Optimisethegradeversusrecoveryrelationshipinabankthroughcontroloffrothvelocityandstability•Modelbasedcontrol-Modeldevelopedutilisingprocessinstrumentation-Concentrategradeandrecoverytargetsestablishedforeachbankbyamodel-FrothvisionsystemsmaintainoperationattargetedconditionsCorrelationofVisiofrothParameterswithFlotationCellPerformance25ProcessTechnologyCorrelationBetweenCollapseRateandBubblesize•Inverserelationshipbetweenbubblesizeandcollapserateparameter•Consequenceofrapidsurfacedisintegration(Hatfield,2007)R2=0.8331R2=0.72090.02.04.06.08.010.012.014.016.00.05.010.015.020.025.030.0AverageBubbleSize(cm)CollapseRate(%perframepair)Zoom1(30observations)Zoom2(28observations)CorrelationofVisiofrothParameterswithFlotationCellPerformance26ProcessTechnologyAcknowledgements•NorthparkesMetallurgicalandtechnicianswhoassistedwiththetestprogramandreviewedthetestworkresults(RickDunn,AdamClark,HeatherGaut,TomRivet)•JKMRCandMcGillresearcherswhoassistedwiththetestwork(DavidSeaman,EddySanwani,CesarGomez,JorgeTorrealba,BrigitteSeaman,MarcoVera,EsterSodenandMichaelRosenfield)•AMIRAP9Sponsorsforfundingthetestworkcampaign 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