简介:TheextractionofCe(Ⅳ)inH2SO4/H3PO4systemwasinvestigatedsystematicallyusingbifunctionalionicliquidextractants(Bif-ILES)[A336][P507],[A336][P204]and[A336][C272]inn-heptane.TheeffectsofH2SO4concentration,extractantconcentrationandsalting-outagentconcentrationwereobservedindetail.TheextractionmechanismofCe(Ⅳ)inH2SO4/H3PO4systemwasobtained.ThecomparisonwithotherextractantssuchasCyanex923,TBPwasalsostudied.Thermodynamicfunctionsoftheextractionreactionwerecalculated,showingthattheextractionwasanexothermicprocess.TheseparationofCe(Ⅳ)fromRE(Ⅲ)andTh(Ⅳ)wasalsoinvestigated.TheresultindicatedthatCe(Ⅳ)couldbeselectivelyextractedinthissystem.CePO4nanoparticleswereobtainedintheprocessofstrippingusingH2O2inH2SO4/H3PO4system.X-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andspectroscopywereadoptedforthecharacterizationofthesample.
简介:本文通过对气体分析、扫描电镜及能谱分析等检测方法,分别对涟钢KR—BOF—RH—CSP(CSP生产线)和KR—BOF—RH—CC(常规板坯生产线)流程生产电工钢精炼及连铸过程中T[O]、[N]及显微夹杂物数量粒径分布情况进行了取样分析。检测结果表明,由于常规板坯在转炉上采用了先进的副枪技术和转炉自动控制技术,钢的T[O]、T[N]含量控制方面要优于CSP生产线;在显微夹杂物的数量与粒径分布方面,常规板坯生产线铸坯中显微夹杂物数量比CSP生产线少约1.8个/mm2,在10μm以下夹杂物占的比例比CSP生产线高约6%,并且铸坯中球状夹杂物比例明显比CSP生产线高,这说明常规板坯生产线的钙处理控制、中包覆盖剂及中包流场设计方面要优于CSP生产线。