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Patent SORBENT FOR LITHIUM EXTRACTION

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Patent SORBENT FOR LITHIUM EXTRACTION ( patent-sorbent-for-lithium-extraction )

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US 8,753,594B1 78 tureand/orpressuresutilizingahydraulicpres,arolmil,an lithiumsaltswouldpassthroughtheshetorfilmfromthe extruder,orahighshearmixer.Forexample,incertain brinetothelowionicstrengthsolutionbyatunnelingorlike embodiments,thepowdermixturecanbesubjectedtopres suresofatleast3000psi,foratimeperiodofatleast3 minutes.Incertainotherembodiments,thepowdermixture canbesubjectedtoincreasingpresures,forexample,the powdermixturecanfirstbesubjectedtoincreasingpressures mechanism. Incertainembodiments,alithiumionpermeableshetor filmmaypreventcross-contaminationbyothersaltsasonly lithiumsaltscanpassthroughthesheetorfilm. Incertainembodiments,thelithiumionpermeableshetor filmcanfindotheruses,forexample,asamembranefor ofatleast3000psi,anduptoabout10,000psi.Inonespecific embodiment,thepowdermixtureissintered,whereinthe electrolysisorelectrodialysisandthereforeserveasameans powdermixturesubjectedtoapressureofabout3000psifor10 ofextractionandconcentration. 1minute,released,subjectedtoapressureofabout4000psi TheLAI-polymermatrixispreferablyformedofparticles foraminute,released,subjectedtoapressureofabout5000 havingadiameterofbetweenabout0.05and5mm,prefer psiforabout3minutes,released,Subjectedtoapressureof ablylesthanabout2.5mmindiameter,andevenmore about10,000psiforabout3minutes,andreleased.Incertain15 embodiments,duringsintering,thepresscanbeheatedtoa temperatureofgreaterthan100°C.,preferablygreaterthan about200°C.,morepreferablygreaterthanabout300°C.It ispreferedthatthetemperatureduringsinteringbemain tainedatbelowabout250°C.,which,incertainembodi betweenabout0.6and0.8mm. ments,isapproximatelythelimitofthethermalstabilityof Incertainembodiments,otheradditivescanbeaddedtothe theLAI.Theresultingsolidsinteredblockorshetcanthen matrix.Forexample,inoneembodiment,aporeforming bebrokenintolargegranulesutilizingahammerorlike materialcanbeaddedtothematrixmaterialandthen instrumenttoprovideavarietyofdiferentsizedparticles. removedaftermatrixformation.Preferredporeforming Theresultingparticlescanthenbesievedintovariousfrac25 materialscanincludewateroralcoholsolublesalts,suchas tions,suchas,afirstfractionhavingadiameterofbetween calciumcarbonate,lithiumchloride,sodiumchloride, about300and450um,asecondfractionhavingadiameter Sodiumsulfate,sodiumbenzoate,organicmaterialssuchas betweenabout180and300um,andathirdfractionhavinga polyvinylalcohol,Sugars,polyethyleneoxideandcopoly diameterofbetweenabout100and180um.Incertain mers,urea,calciumcarbonate,andtriacetin.Incertain embodiments,particleshavingadiameterofuptoabout100030 embodiments,acalcineddiatomaceousearthandsimilar umcanbeusedinaccordancewiththemethodsdescribed materialmaybeaddedtothematrixtopromotefluidflowand herein,alternativelyparticleshavingadiameterofbetween preventcompactionofthematrixandtheresultantlosof about200and800um,alternativelybetweenabout200and permeability.Theseaditivesaregenerallyaddedbefore,or duringthesinteringproces. Inoneembodiment,awaterbasedpolymerorpolymer 35 Generaly,duringuse,theLAImatrixpreparedaccording 500um,alternativelybetweenabout500and800um. precursorisaddedtoLAIpowderinahighshearagglomera totheabovedescribedprocessiswashedwithapredeter tor,SuchthatSmallparticlesareproduceddirectlythatmay minedamountofwatertoremoveaportionoftheLiClfrom thenbeusedasprepared,orcanbefurtherprocessedby thematrix,therebycreatingvacantsitesthatareavailableto dryingand/orcuringatelevatedtemperatures.Inanother receivelithiumhalidesorotherlithiumsaltsfromabrineor embodiment,LAIpowderismixedwithapolymerbinderthat40 Solution.Forexample,uponexposuretoasolutionorbrine includesoneormoreofanacrylicemulsion,awatersoluble thatincludeslithiumchloride,theLAImatrixcanthenaccept polymer,oranemulsionofaninterpolymerofpolyvinylidine lithiumchlorideions.Theinitialwashwaterpreferably fluorideandacrylic,optionalyincludingatleastonecross includesatleastasmallconcentrationofLiCl.Incertain linkingagent,toformaviscousfluidormass,whichcanthen embodiments,thewashwaterincludesatleast100ppmLiCl. beformedintoparticles,shets,strings,orotherdesired45 Inalternateembodiments,thewashwaterincludesatleast shapes,dried,cured,andoptionalysubjectedtoagranulating 150ppmLiCl.Inyetotherembodiments,thewashwater process. includesatleast200ppmLiCl.Incertainembodiments,the Incertainembodiments,theLAI-polymermatrixcanbe washwatermayincludeasalt,suchasNaCl,KCl,orany pressedinamoldtoformanydesiredshapeorsize.Incertain othersaltornon-ionicsolutethatmaybeadvantageousfora embodiments,theLAI-polymermatrixcanbecuredand50 particularlithiumsaltextractionproces.Typicaly,chlorides formedasashetorlikeshape,Suitableforuseas,for areselectedduetotheirrelativelylowcost,howeveritis example,acartridgefilterwhereinalithiumcontainingSolu understoodthatotherhalidescanalsobeused.Incertain tionispassedoverand/orthroughtheshetfortheextraction embodiments,divalentandtrivalentsaltsareavoided. ofthelithiumcontainingions. AfterthevacantsitesintheLAImatrixhavebeenexposed Inotherembodiments,theLAI-polymermatrixcanbe55 byrinsingwiththewashwater,thevacantsitescanthenbe pressedintoamoldandcuredtoformasheetorfilmthatis loadedwith“new”LiClorotherlithiumsaltsbyexposingthe ment,thelithiumsaltpermeableshetorfilmcanbeplaced60 lithium.AstheLiClinthebrineorsolutioncontactavacant betweentwofluids,whereinthefirstfluidisalithiumcon site,thelithiumionsarecapturedbytheLAImatrixandfil tainingsolutionorbrine,andthesecondfluidisalowionic theexposedvacancies.AftertheLAImatrixissaturatedwith strengthsolution.Thelithiumsaltsfromthelithiumcontain lithiumsalt,forexampleLiCl,theflowofthebrinecanbe ingsolutionorbrinewouldbeintercalatedintothepermeable stoped.ThecapturedLiClcanthenbeunloadedfromthe shetorfilmandwouldpassthroughtothelowionicstrength65 LAImatrixbyagainwashingtheLAImatrixwithwashwater. solutionontheothersideoftheshetorfilm.Withoutwishing Incertainembodiments,asnotedwithrespecttotheinitial tobeboundbyanyspecifictheory,itisbelievedthatthe washwaterabove,thewashwaterincludesasmallamountof permeabletolithiumsalts,butnotporoustothesolution. LAI matrixtothebrineorsolutionthatincludesLiClorother Suchashetorfilmcanbeemployedinavarietyofwaysto lithiumsalts.Incertainembodiments,thebrineorsolution removelithiumfromabrine.Forexample,inoneembodi doesnotincludesaltsthatwilcompetewiththeextractionof preferablybetweenabout0.1and2mmindiameter.Incertain embodiments,theparticleshaveadiameterofbetweenabout 0.1and0.5mm.Alternatively,theparticleshaveadiameterof betweenabout0.2and0.8mm,alternativelybetweenabout 0.2and0.4mm,alternativelybetweenabout0.2and0.6mm. alternativelybetweenabout0.4and0.6mm,oralternatively

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