ASTM D5744-2007e1 使用湿度室测试固体材料老化标准试验方法

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【英文标准名称】:StandardTestMethodforLaboratoryWeatheringofSolidMaterialsUsingaHumidityCell
【原文标准名称】:使用湿度室测试固体材料老化标准试验方法
【标准号】:ASTMD5744-2007e1
【标准状态】:现行
【国别】:美国
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D34.01.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:chemicalweathering;humiditycell;laboratoryweathering;milltailings;ore;oxidation;solidmaterial;wasterock;Acceleratedweathering;Chemicalweathering;Humiditycells;Metal-minewaste-rockweathering;Milltailings;Oxidationtesting;Rockmat
【摘要】:Thelaboratoryweatheringprocedurewillgeneratedatathatcanbeusedto:(1)determinewhetherasolidmaterialwillproduceanacidic,alkaline,orneutraleffluent,(2)identifysolutesintheeffluentthatrepresentdissolvedweatheringproductsformedduringaspecifiedperiodoftime,(3)determinethemassofsoluterelease,and(4)determinetherateatwhichsolutesarereleased(fromthesolidsintotheeffluent)underthecloselycontrolledconditionsofthetest.Datageneratedbythelaboratoryweatheringprocedurecanbeusedtoaddressthefollowingobjectives:(1)determinethevariationofdrainagequalityasafunctionofcompositionalvariations(forexample,ironsulfideandcalcium+magnesiumcarbonatecontents)withinindividualmine-rocklithologies,(2)determinetheamountofNPaccessibleinamine-rocksampletoneutralizeacidandmaintaindrainagepHx2265;6.0undertheconditionsofthetest,(3)estimatemine-rockweatheringratestoaidinpredictingtheenvironmentalbehaviorofminerock,and(4)determinemine-rockweatheringratestoaidinexperimentaldesignofsite-specifickinetictests.Thelaboratory-weatheringprocedureprovidesconditionsconducivetooxidationofsolidmaterialconstituentsandenhancesthetransportofweatheringreactionproductscontainedintheresultingweeklyeffluent.Thisisaccomplishedbycontrollingtheexposureofthesolidmaterialsampletosuchenvironmentalparametersasreactionenvironmenttemperatureandapplicationrateofwaterandoxygen.Becauseefficientremovalofreactionproductsisvitaltotrackmineraldissolutionratesduringtheprocedure,laboratoryleachvolumesarelargeperunitmassofrocktopromotetherinsingofweathering-reactionproductsfromthemine-rocksample.Acomparisonoflaboratorykinetictestswithfieldtestshasshownthatmorereactionproductsfrommineraldissolutionareconsistentlyreleasedperunitweightandunittimeinlaboratoryweatheringtests(9).Forexample,sulfatereleaseratesobservedinlaboratorytestsofmetal-minerockhavebeenreportedtobe3to8timesthoseforsmall-scalefieldtestpilesofDuluthComplexrock(10),andfrom2to20timesthoseforsmall-scalefieldtestpilesofArcheangreenstonerock(11).Agreaterincreaseisanticipatedwhenlaboratoryratesarecomparedwithfieldratesmeasuredfromoperationalwaste-rockpiles.FundamentalassumptionsgoverningOptionsAandBoftheprocedure:1.1Thiskinetictestmethodcoversalaboratoryweatheringprocedurethat(1)enhancesreaction-producttransportintheaqueousleachofasolidmaterialsampleofspecifiedmass,and(2)measuresratesofweathering-productmassrelease.Solubleweatheringproductsaremobilizedbyafixed-volumeaqueousleachthatisperformedandcollectedweekly.LeachatesamplesareanalyzedforpH,alkalinity/acidity,specificconductance,sulfate,andotherselectedanalytes.1.1.1Thistestmethodisintendedforusetomeetkinetictestingregulatoryrequirementsforminingwasterockandoressizedtopassa6.3-mm(0.25-in.)Tylerscreen.1.1.2Interlaboratorytestingofthismethodhasbeenconfinedtominewasterock.Applicationofthistestmethodtometallurgical-processingwaste(forexample,milltailings)isoutsidethescopeofthetestmethod.1.2Thistestmethodisamodificationofalaboratoryweatheringproceduredevelopedori......
【中国标准分类号】:A21
【国际标准分类号】:19_040
【页数】:19P.;A4
【正文语种】:英语