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1、RecoveryofRareEarthandCobaltfromCo-basedMagneticScrapsXuTao1,2,ZhangXiao-dong3(1BaotouResearchInstituteofRareEarth,Baotou014030,China2NationalEngineeringResearchCenterofRareEarthMetallurgyandFunctionalMaterials,Baotou014030,China3InnerMongoliaBaotouSteelRare
2、EarthHi-TechCO.,LTD.,Baotou014030,China)Abstract:ThereuseofREandcobaltinCo-basedmagneticscrapswasstudied.Makingsurefeatlixiviatedconditionisthat:200mesh,sulfuricaciddosageof1.4timestheoreticdosage,temperature90℃,leachingtime1h.Theresultindicatedthatlixiviate
3、rateofcobaltandrareearthattained97.8%,99.6%respectively.Theoptimumtechnologyconditionswas:Na2S2O8dosageof8timestheoreticdosage,oxidationtemperature80℃,oxidationtime2hour,pH=4.5.Rareearthwasprecipitatedbysaturated(NH4)2C2O4solution,afterroastingofrareearthoxa
4、late,receivedrareearthoxide.Thesamariumandgadoliniumsumrecoverywas96%,92%respectively.Cobalt-ironresiduewassoakedbyhydrochloricacid,theFe(OH)3waspreferentialsolution,pHwasadjustedto1.4byhydrochloricacid,Co(OH)3doesnotdissolved,Cobaltandironwereseparated,afte
5、rroastingofCo(OH)3,receivedcobaltoxide.Thetotalrecoveryofcobaltwasfoundtobe97%andrareearthswas96%.Keywords:cobalt-basedmagneticscrap;cobalt;rareearthCLCnumber:TE992.3Documentcode:ASmCoalloywas70yearsofthe20thcenturydevelopedanewtypeofpermanentmagneticmateria
6、ls,becauseofitshighCurietemperature,temperaturestability,corrosionresistanceandgoodoxidationresistance,theadvantagesofthepermanentmagnetmaterialhasanirreplaceablerole,sosincetheadventofSmCopermanentmagnetgetwideattention.Thematerialinmicrowavecommunicationte
7、chnology,audio-visualtechnology,electricalengineering,instrumentationtechnology,computingtechnology,automationtechnology,transportation,petrochemicals,magnetictechnology,magneticseparationtechnology,biologicalengineeringandmagneticfieldsofmedicalandfitnesseq
8、uipmentiswidelyusedThematerialshavealreadybecomeanimportantmaterialfoundationofnewtechnologies[1].Permanentmagnetmaterialinthemoldingprocess,20to30%ofscrapmaterialanddiscardedaswaste,extractiono
