低品位風(fēng)化殼淋積型稀土礦浸出傳質(zhì)過程優(yōu)化研究.pdf

1、I分類號：密級：學(xué)號：20100239單位代碼：10407碩士學(xué)位論文論文題目:低品位風(fēng)化殼淋積型稀土礦浸出傳質(zhì)低品位風(fēng)化殼淋積型稀土礦浸出傳質(zhì)過程優(yōu)化研究過程優(yōu)化研究研究方向礦物分選理論與工藝礦物分選理論與工藝專業(yè)名稱礦物加工工程礦物加工工程研究生姓名唐學(xué)昆唐學(xué)昆導(dǎo)師姓名、職稱羅仙平教授羅仙平教授、田君研究員田君研究員2013年06月07日江西贛州IIAbstractWeatheredcrustelutiondepositedrare

2、earthewasunder40yearsofextensivelyoverloadminedtherichermeaccessibledepositsofthisrareearthresourcegraduallygetminedinpriity.WithprolongedproductionperiodthisrareearthresourcebecomingmemedilutionappearedalotoflowgradeWea

3、theredcrustelutiondepositedrareearthe(therareearthgradeislowerthan0.08%)whichisarefractyrareeartheshardtogetfullyusedinthepracticalproductionprocess.SoindertoslovethisproblemthispaperslovetheLongnanweatheredcrustelutiond

4、epositedrareeartheasresearchsubjectsmakestdutyoptimizingonitmasstransferprocesstoofferthytosupptitsfullyused.ThispaperwerefriststudythemasstransferoftheleachingprocessofWeatheredcrustelutiondepositedrareearthetheresultsh

5、owsthatwhentheleachingflowrateatthelowlevelthelongitudinaldiffusioncoefficientisthemainfactinfluencethemasstransfereffect.Whentheleachingflowrateatthehighlevelthemasstransferimpedanceisthemainfactinfluencethemasstransfer

6、effect.alsomakestudyontheinfluencefatssuchasleachingflowratelixiviantconcentrationtheratioofliquidtosolidpackedehigh.Theresultshowsthattheleachingwillgetaoptimalleachingmasstransferundertheconditionofleachingflowrate0.38

7、mLminlixiviantconcentration4%theratioofliquidtosolidis1:2.indertofurthermeoptimizingthemasstransferoftheleachingprocessthesesbaniagumanaturalmacromoleculecompoundweretakenasleachingaidaganttooptimizetheleachingmasstransf

8、er.Theresultshowsthatthesesbaniagumcaneffectlyenhancethemasstransferofleachingprocessofweatheredcrustelutiondepositedrareearthebyreducethemasstransferimpedancecoefficient.undertheeffectofthesesbaniagumthelixiviantconcent

9、rationcanbecutdown(from4%to3%)theleachingflowratecanberised(from0.38mLminto0.42mLmin)reducetheratioofliquidtosolid(from1:2to2:5).Bymeansoftakingchemicalmodificationonthesesbaniagumtofurthermeraiseitpoweronenhancingthelea

10、chingprocess.Bycomparisonthecarboxymethylsesbaniagumisbetterthanmonoesterphosphatesesbaniagum.undertheeffectofthecarboxymethylsesbaniagumthelixiviantconcentrationcanbecutdown(from3%to2.5%)theleachingflowratecanberised(fr

11、om0.42mLminto0.45mLmin)buthasinsignificanteffectoncutdowntheratioofliquidtosolid.BymeansofqualitativemeasuresthecontactangleIRspectrumthestudyonthemechanismofcarboxymethylsesbaniagumsesbaniagumonenhancetheleachingprocess

12、werecarriedout.TheresultsshowsthatthecarboxymethylsesbaniagumsesbaniagumwereviaabsbonthesurfaceofWeatheredcrustelutiondepositedrareearthetoimprovingthehyhiliaoftheesothattheleachingprocesswillgetabettermasstransfereffect