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1、用季铵盐从模拟钨矿苏打浸出液中直接萃取钨第21卷第7期V1.2lNO7中国有色金属TheChineseJournalofNonferrousMetals2011年7JJu1.2O1文章编号:1004—0609(2011)07—1756—07用季铵盐从模拟钨矿苏打浸出液中直接萃取钨关文娟,张贵清(中南大学冶金科学与工程学院,长沙410083)摘要:针对从钨矿碱性浸出液中直接萃取钨制取仲钨酸铵(APT)~2艺萃取分相慢,反萃液中WO3浓度偏低的问题,采用季铵盐jl阜基甲基氯化铵(Tri.一octylmet
2、hyl—ammoniumchloride,TOMAC)为萃取剂,对从钨矿苏打浸m模拟料液中直接萃取钨进行研究,分别考察钨矿浸出液中Na2CO3浓度,反萃剂组成及浓度对萃取和反萃取过程的影响:分别绘制萃取等温线和反萃取等温线,并结合Kremser方程选择合适的反萃流比以及逆流反萃级数,用离心萃取器模拟逆流串级萃取与反萃取实验.结果表明:料液中Na2CO3浓度对WO3萃取率影响不入,但对萃取过程分相性能影响较大;当萃取剂浓度为5O%(体积分数)时,有机相饱和萃钨容量(以wo3计)为91.49g/L;向反萃
3、剂NHHCO中加入NHyH2O,不仅能提高反萃液(钨酸铵溶液)的稳定性,而且有利r提高反萃液中WO3的浓度.实验条件下分相良好,反萃液中WO浓度达到160g/L左右,杂质含量完全可以满足生产0级APT的需要.关键词:钨;溶剂萃取;季铵盐;Na2CO3体系中图分类号:TF841.1文献标志码:AExtractionoftungstenfromsimulatedautoclave—sodaleachingliquorofscheelitewithquaternaryammoniumsaltGUANWen-
4、juan,ZHANGGui—qing(SchoolofMetallurgicalScienceandEngineering,CentralSouthUniversity,Changsha410083,China)Abstract:Thedirectsolventextractionoftungstenfromautoclave—sodaleachsolutionofscheeliteusingquaternaryammoniumsalt(tri一,z—octylmethy—lammoniumchlor
5、ide,TOMAC)wasinvestigatedtosolvetheproblemsofslowphaseseparationandlowWO3concentrationinstripliquorwhicharemaindisadvantagesintheprocessofdirectsolventextractionoftungstenfromalkalinemedium.TheeffectsofNa2CO3concentrationinleachingsolution,compositionan
6、dconcentrationofstrippingreagentontheextractionandstrippingwereinvestigated.Theisothermsoftheextractionandstrippingwereplotted,andtheoptimumflowratioandstrippingstageweredeterminedthroughKremserformula.Basedonthese,thecentrifugalextractorwasusedtosimula
7、tethecountercurrentextraction,TheresultsindicatethattheconcentrationofNa2CO3infeedsolutionhaslittleinfluenceontheextractionofWO3butgreatinfluenceonthephaseseparationintheextraction,thesaturatedloadingcapacity(forWO3)oforganicreaches91.49g/Lwhentheconcen
8、trationofextractantis50%(volumefraction),theadditionofNH3'H20intoNH4HCO3asthemixedstrippingreagentnotonlyimprovesthestabilityofstrippingliquor,butalsoincreasestheWO3concentrationinstrippingliquor.Thephaseseparationisgoodduringthe
