类球形草酸钴沉淀粉末的制备研究宋晨杰1黄凯1,2*（1.北京科技大学冶金与生态工程学院，北京100083；2.北京市稀贵金属绿色提取与回收重点实验室，北京100083）摘要草酸钴是制备钴粉的重要前驱体，其常见的沉淀产物呈长条棒状，而工业上急需球状或类球状的颗粒。本研究提出了一种新颖的方法，控制钴离子/草酸根的化学计量比远离1.0和温度在80℃以上时，能成功地将草酸钴沉淀形貌从晶须状改变成类球形。研究认为，在钴离子过量或草酸根离子过量的情况，会影响草酸钴成核基团及晶核表面的荷电状态，而80℃以上高温作用可能显著改变晶核表面液膜层内出现紊流传质现象，使得晶核各个晶面上生长速度差异变小，最终形成类球形颗粒草酸钴。本研究结果，将为草酸钴沉淀形貌调控及类球形草酸钴的生产提供重要指导。关键词类球形草酸钴；等轴晶；沉淀；温度；各向同性生长PreparationofQuasi-SphericalCobaltOxalatePowderSongChenjie1HuangKai1,2*（1.SchoolofMetallurgicalandEcologicalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China;2.BeijingKeyLaboratoryofGreenRecyclingandExtractionofMetals,UniversityofScienceandTechnologyBeijing,Beijing100083,China）ABSTRACTCobaltoxalateisanimportantrawmaterialforpreparingcobaltpowder.Itsconventionalprecipitatesaremainlywhiskers,whilesphericalorquasi-sphericalparticlesareurgentlyneededintheindustry.Inthisstudy,anovelmethodwasproposed,whichcouldchangethemorphologyofcobaltoxalateprecipitatesfromwhiskerstoquasi-sphericalbymakingthestoichiometricratioofcobaltions/oxalateawayfrom1.0andthetemperatureabove80℃.Theresearchshowsthatexcessivecobaltionsoroxalateionsaffectthestateofchargeofthecobalt-oxalatenucleatinggroupandthesurfaceofthecrystalnucleus.Atemperatureofover80℃maysignificantlyalterturbulentmasstransferwithintheliquidfilmonthenucleussurface,whichcanreducethedifferenceinthegrowthrateoneachsurfaceofthecrystalnucleustoformquasi-sphericalparticlesofcobaltoxalate.Theresultsofthisstudycanprovideimportantguidancefortheprecipitationmorphologycontrolofcobaltoxalateandtheproductionandpreparationofquasi-sphericalcobaltoxalateparticles.KEYWORDSquasi-sphericalcobaltoxalate;equiaxedcrystal;precipita...
