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《氧化铝赤泥盐酸浸出稀土元素研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第36卷第4期稀有金属2012年7月V01.36No.4CHINESEJOURNALOFRAREMETALSJu1.2012氧化铝赤泥盐酸浸出稀土元素研究王克勤,宋嘉伟,高燕,姜武(太原理工大学材料科学与工程学院,山西太原030024)摘要:在用盐酸浸出氧化铝赤泥提取氧化钪的过程中,稀土元素镧,铈,钕也一同浸出,进入到浸出液中。研究了拜耳法赤泥盐酸浸出稀土元素镧,铈,钕的过程。研究了浸出温度、酸度、液固比和浸出时间对稀土元素浸出率的影响。研究结果表明,影响稀土浸出率的因素依次是浸出温度,盐酸浓度,配料液固比,和浸出时间。当接近沸点109℃浸出时,镧、铈、钕浸出率提高最快。盐酸
2、酸度在4—5tool·LI1时,浸出率升高较快,5~7mol·L时,缓慢提高,当超过7tool-L-1时,镧、铈、钕的浸出率基本不变化。当液固比为4.0时,镧、铈、钕元素的浸出率较低,仅为60%一75%之间,当液固比提高到5.0时,稀土元素的浸出率升高较快。随着浸出时间的延长,氧化稀土的浸出率从60~180rain时,缓慢提高,在180min时达到最大值,超过180min后,变化不大。在温度为沸点(109℃),液固比6.0,时间180min。盐酸浓度7mol·L.1的条件下浸出,赤泥中La,ce,Nd的浸出率能达到95%以上。关键词:拜耳法赤泥;浸出;液固比doi:10.39
3、69/j.issn.0258—7076.2012.04.028中图分类号:TF845文献标识码:A文章编号:0258—7076(2012)04—0676—05LeachingRareEarthElementsfromAluminaRedMudHydrochloricAcidWangKeqin,SongJiawei,GaoYan,JiangWu(CollegeofMaterialsScienceandEngineering,TaiyuanUnivemityofTechnology,Taiyuan030024,China)Abstract:Intheprocessofextrac
4、tingscandiumoxidefromaluminaoxideredmudusinghydrochloricacidleaching,itwasfoundthatrareearthelements,suchasLa,Ce,andNdalsoenteredtheleachingsolution.TheBayerprocessforredmudhydrochloricacidleac-hingrareearthelements,lanthanum,cerium,andneodymiumprocesswasstudied.Theleachingtemperature,acidi
5、ty,theliquid-solidratioandleachingtimeleachingrateofrareearthelementsofinfluencewerestudied.Theresultsshowedthat,theinfluencefactorsofrareearthleachingrateinturnwasleachingtemperature,hydrochloricacidconcentration,theliquid—solidratio,andleachingtime.Whenclosetoboilingpoint109oC,lanthanum,c
6、erium,andneod)miumleachingrateincreasedthefastest.Hydrochloricacidin4—5mol·L_。,leachingrateincreasedquickly,5~7mol·L_。,rosegradually,whenmorethan7mol·L_。,lanthanum,cerium,andne-odymiumleachingrateofbasicdidnotchange.Whentheliquid—solidratioof4.0,lanthanum,cerium,andneodymiumelementex—tracti
7、onrateWaslow,only60%~75%between,whentheliquid—solidratioincreasedto5.0,rareearthelementsextractionratein—creasedquickly.Astheextensionofleachingtime,from60to180min,therareearthoxideleachingrateslowlyincreased,in180mintOachievemaximum.AstOleachingtimeofmo
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