Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite-中国期刊网

摘要 ThepresentstudyinvestigatedtheinfluenceofhightemperatureoxidationandreductionpretreatmentsontheleachingrateofPanzhihuailmenite.Theas-pretreatedilmenitewasleachedwith20%HClat105℃.Theleachingprocesswascontrolledbythephasesandmicrostructuresthatevolvedduringthepretreatmentprocesses.Theleachingkineticsofpurehematite,ilmeniteandpseudobrookitewerecharacterizedtoclarifythephaseeffectontheiron-leachingrate;therateofironleachingoccursinthefollowingorderintheHClsolution:hematite（ferriciron）>ilmenite（ferrousiron）>>pseudobrookite（ferriciron）.Therefore,theoften-citednotionthatferrousirondissolvesfasterinHClsolutionsthanferricironwhenexplainingthepretreatmenteffectsisinaccurate.Moreover,theoxidationpretreatment（at600-1000℃for4h）cannotdestroythedensestructureofthePanzhihuailmenite.Therefore,theinfluenceexertedbytheoxidationontheleachingprocessisprimarilydeterminedbythephasechange;oxidationat600and700℃slightlyincreasedtherateofironleachingbecausetheilmenitewastransformedintohematite,whiletheoxidationat900-1000℃significantlyreducedtherateofironleachingbecauseapseudobrookitephaseformed.Thereductioneffectwassubsequentlyinvestigated;theas-oxidizedilmenitewasreducedunderH2at750℃for30min.Thereductionsignificantlyacceleratedtherateofsubsequentironleachingsuchthatnearlyalloftheironhaddissolvedafterleachingfor2hin20%HClat105℃.Thisenhancediron-leachingrateismainlyattributedtothecracksandholesthatformedduringthereductionprocess.

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Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite

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Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite

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