简介:Theleachingbehaviorofmetalsfromapressure-leachingslagwasinvestigatedusingadesulphurization-leaching-hydrolysisprocessfortherecoveryofbismuthandantimony.Variousparameterswerestudied,includingtheamountofacidadded,temperature,time,additionofNaClandsolid-liquidratiointheleachingprocess.Theexperimentalresultsshowthatthecontentsofbismuthandantimonyaremostlyenrichedintheprocessofkerosenedesulphurization.Morethan98%Sband96%Biareextractedunderthedeterminedconditions.Intheprocessofhydrolysis,theprecipitationratesofbismuthandantimonyare97.80%and94.59%,respectively.Undertheoptimumexperimentalconditions,therecoveryrateofbismuthandantimonycanbeupto95.80%and90.80%,respeoively.
简介:Thedissolutionkineticsofvanadiumtrioxideinsulphuricacid-oxygenmediumwasexamined.Itwasdeterminedthattheconcentrationofsulphuricacidandstirringspeedabove800rmin1didnotsignificantlyaffectvanadiumextraction.Thedissolutionrateincreasedwithincreasingtemperatureandoxygenpartialpressure,butdecreasedwithincreasingparticlesize.Thedissolutionkineticswascontrolledbythechemicalreactionatthesurfacewiththeestimatedactivationenergyof43.46kJ·mol-1.Thel...
简介:Thethermaldiffusioncoefficient,thermalconductivity,andthermalexpansioncoefficientofCuCralloypreparedbyinfiltrationweremeasuredbythermalconstanttesteranddilatometerbeforeandafterhighpressureheattreatment,atthesametime,theeffectofhighpressuretreatmentonthethermalphysicalpropertiesofCuCralloywasdiscussedbytheanalysisofitsmicrostructure.TheexperimentalresultsshowthathighpressureheattreatmentcanincreasethethermaldiffusioncoefficientandthermalconductivityofCuCralloy,butitchangesslightlyinthepressurerangeof1–6GPa.Asforthermalexpansioncoefficient,whenthetemperatureishigherthan130°C,itisobviouslyhigherthanthatofthealloywithouthighpressuretreatmentafter1GPapressuretreatment,andthehigherthetemperatureis,thelargertheirdifferencesare.
简介:ThetreatmentoftheGacuncomplexCu-PbbulkconcentratewithhighZn,Ag,etc.,byoxygenpressureacidleachingwasstudied.Theprimarycopperandleadmineralsintheconcentratearetetrahedriteandgalena.Thetreatmentoftetrahedritewasrarelystudied,andmostofsilveroccurredinthemineraltoo.Theoptimumoperatingparametersofoxygenpressureacidleachingwereestablishedbyconditionaltests.Undertheseparameters,theresultofpilotscaletestshowedthattheleachingpercentagesofcopperandzincwereseparatelyashighas98.9wt.%and94.9wt.%,whileleadandsilverweretransformedintosulfateandsulfideprecipitations,respectively.Thecopperandzincinlixiviumwerereclaimedbyextraction-electrowinningandpurification-electrowinning,respectively,andtheleadandsilverintheresiduewerereclaimedseparatelybycarbonatetransformation-silicofluoricacidleachingandthiourealeaching.
简介:Aprocessoftheselectiveleachingofnickelfromlow-sulfurNi-Cumatteatatmosphericpressurewasdescribed.ThismattewasobtainedfromhighgradeNi-Cumattebymagneticseparation,whichmainlycontainedNi-Cualloyandasmallquantityofsulfides.Firstly,theacid-oxygen(CuSO4-H2SO4-O2)leachingofthemattewasconductedatatmosphericpressure.WhenthesolutionpHvaluereached1.0-2.0,theoxygenflowwasceased.Then,theaqueouscopperwasrejectedbycementationreactionwithNiinthealloy.ThemineralogicalcharacteristicsofthematteintheprocesswereanalyzedbyX-raydiffractometry,opticalmicroscopyandscanningelectronmicroscopy.Andtheeffectsofvariationsintemperature,particlesizedistribution,oxygenflowrate,pulpdensity,initialacidconcentrationandinitialconcentrationofcopperionwereinvestigated.