Nb_%282%29O_%285%29-Al_%282%29O_%283%29-MgO-Na_%282%29O-CaO-SiO_%282%29体系相平衡研究.pdfVIP免费

doi:１０􀆰３９６９∕j􀆰issn􀆰１００７Ｇ７５４５􀆰２０２３􀆰１０􀆰００８收稿日期:２０２３Ｇ０４Ｇ２４基金项目:国家自然科学基金重大研究计划重点支持项目(９２０６２２２３)作者简介:陈昌(１９９５Ｇ),男,硕士;通信作者:陈雯(１９６５Ｇ),女,博士,正高级工程师Nb２O５ＧAl２O３ＧMgOＧNa２OＧCaOＧSiO２体系相平衡研究陈昌,任国兴,韩文生,冉孟杰,陈雯(长沙矿冶研究院有限责任公司,长沙４１００１２)摘要:为揭示Nb２O５ＧAl２O３ＧMgOＧNa２OＧCaOＧSiO２多元含铌炉渣体系中的铌矿物的定向结晶规律,采用高温相平衡—冷淬—SEMＧEDS∕XRD∕EMPA试验方法,考察了温度、钙硅比(CaO∕SiO２)、Nb２O５含量等因素对炉渣相平衡关系的影响,并构建了含铌矿物结晶析出的优势相图.结果表明:铌的结晶矿物主要有三种,分别为Ca２Nb２O７、Ca(１４－x)Nb(２＋x)Si８O(３５＋１􀆰５x)和３CaO􀅰MgO􀅰Nb２O５;铌先富集于液相,相较于脉石组分,含铌固相为后析出相;CaO∕SiO２增加会使含铌固相优势区间发生从Ca２Nb２O７相到Ca(１４－x)Nb(２＋x)Si８O(３５＋１􀆰５x)相、再到３CaO􀅰MgO􀅰Nb２O５相的转变.Ca２Nb２O７相的优势析晶区间为:温度１０５０~１２００℃,C∕S＝０􀆰８~１􀆰２.Nb２O５在Ca(１４Ｇx)Nb(２＋x)Si８O(３５＋１􀆰５x)相中的嵌布质量浓度在１８􀆰５％~１９􀆰５％.关键词:铌资源;相平衡;矿相转化;Nb２O５ＧAl２O３ＧMgOＧNa２OＧCaOＧSiO２中图分类号:TF８４１􀆰６文献标志码:A文章编号:１００７Ｇ７５４５(２０２３)１０Ｇ００５５Ｇ０９StudyonPhaseEquilibriumofNb２O５ＧAl２O３ＧMgOＧNa２OＧCaOＧSiO２SystemCHENChang,RENGuoxing,HANWensheng,RANMengjie,CHENWen(ChangshaResearchInstituteofMiningandMetallurgyCo􀆰,Ltd􀆰,Changsha４１００１２,China)Abstract:InordertorevealdirectionalcrystallizationrulesofniobiummineralsinNb２O５ＧAl２O３ＧMgOＧNa２OＧCaOＧSiO２multiＧcomponentslagsystem,theinfluenceofcalciumＧsiliconratio(CaO∕SiO２),Nb２O５contentandtemperatureonphasebalanceofslagwasinvestigatedbythehightemperatureequilibrium,coldquenching,SEMＧEDS∕XRD∕EMPAmethod􀆰AdominantphasediagramforthecrystallizationofniobiumＧcontainingmineralswasconstructed􀆰Theresultsshowthatthreeniobiumphasesarefoundinthesystem,itisCa２Nb２O７,Ca(１４－x)Nb(２＋x)Si８O(３５＋１􀆰５x)and３CaO􀅰MgO􀅰Nb２O...