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1、RecoveryofRareEarthandCobaltfromCo-basedMagneticScrapsXuTao1,2,ZhangXiao-dong3(1BaotouResearchInstituteofRareEarth,Baotou014030,China2NationalEngineeringResearchCenterofRareEarthMetallurgyandFunctionalMaterials,Baotou014030,China3InnerMongoliaBaotouSteelRareEarthHi-TechCO.,LTD.,Baot
2、ou014030,China)Abstract:ThereuseofREandcobaltinCo-basedmagneticscrapswasstudied.Makingsurefeatlixiviatedconditionisthat:200mesh,sulfuricaciddosageof1.4timestheoreticdosage,temperature90℃,leachingtime1h.Theresultindicatedthatlixiviaterateofcobaltandrareearthattained97.8%,99.6%respect
3、ively.Theoptimumtechnologyconditionswas:Na2S2O8dosageof8timestheoreticdosage,oxidationtemperature80℃,oxidationtime2hour,pH=4.5.Rareearthwasprecipitatedbysaturated(NH4)2C2O4solution,afterroastingofrareearthoxalate,receivedrareearthoxide.Thesamariumandgadoliniumsumrecoverywas96%,92%re
4、spectively.Cobalt-ironresiduewassoakedbyhydrochloricacid,theFe(OH)3waspreferentialsolution,pHwasadjustedto1.4byhydrochloricacid,Co(OH)3doesnotdissolved,Cobaltandironwereseparated,afterroastingofCo(OH)3,receivedcobaltoxide.Thetotalrecoveryofcobaltwasfoundtobe97%andrareearthswas96%.Ke
5、ywords:cobalt-basedmagneticscrap;cobalt;rareearthCLCnumber:TE992.3Documentcode:ASmCoalloywas70yearsofthe20thcenturydevelopedanewtypeofpermanentmagneticmaterials,becauseofitshighCurietemperature,temperaturestability,corrosionresistanceandgoodoxidationresistance,theadvantagesoftheperm
6、anentmagnetmaterialhasanirreplaceablerole,sosincetheadventofSmCopermanentmagnetgetwideattention.Thematerialinmicrowavecommunicationtechnology,audio-visualtechnology,electricalengineering,instrumentationtechnology,computingtechnology,automationtechnology,transportation,petrochemicals
7、,magnetictechnology,magneticseparationtechnology,biologicalengineeringandmagneticfieldsofmedicalandfitnessequipmentiswidelyusedThematerialshavealreadybecomeanimportantmaterialfoundationofnewtechnologies[1].Permanentmagnetmaterialinthemoldingprocess,20to30%ofscrapmaterialanddiscarded
8、aswaste,extractiono
