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 34 bywashingthelithiumaluminateintercalatematrixwiththe washsolution.Incertainembodiments,thelithiumsaltis lithiumchloride. BRIEF DESCRIPTION OF THE DRAWINGS FIG.1isanilustrationofoneembodimentofthepresent invention. FIG.2isagraphicalrepresentationshowingtheloading andunloadingofacolumnaccordingtoanembodimentofthe10 presentinvention. DETAILED DESCRIPTION OF THE INVENTION mercury,molybdenum,nickel,silver,gold,thalium,radon, cesium,rubidium,Vanadium,Sulfur,chlorine,andfluorine, althoughitisunderstoodthatotherelementsandcompounds mayalsobepresent.Brinescanbeobtainedfromnatural Sources,suchas,Chileanbrines,Argentineanbrines,Bolivian brines,orSaltonSeabrines,geothermalbrines,seawater, oilfieldbrines,mineralbrines(e.g.,lithiumchlorideorpotas siumchloridebrines),alkalimetalsaltbrines,andindustrial brines,forexample,industrialbrinesrecoveredfromore leaching,mineraldresing,andthelike.Themethodis equallyapplicabletoartificialypreparedbrineorsaltsolu tions,aswellaswastewaterstreams,assumingthatthesalin ityofthesolutionishighenough(forexample,aminimum concentrationofabout14%byweightcommonsalt).Itis understoodthat,incertainembodiments,theexactconcen trationofsaltsuficienttodrivetosorptionoflithiumintothe lithiumaluminateisdependentontheexactspeciesandtheir concentrationspresentinthesolution. Incertainembodiments,thepresentinventioncanbeused inconjunctionwithmeansforfirstremovingsilicafromthe brine.Forexample,incertainembodiments,thepresent brinescontemplatedforusehereincanbetreatedbyknown means,typicalyknownassilicamanagement,tofirstremove silicaand/oriron,priortotherecoveryofanylithium.In certainembodiments,thebrineorlithiumcontainingSolution can be filtered or treated to remove solids or other elements presentpriortotheselectiverecoveryoflithium. Asusedherein,simulatedbrinereferstoasyntheticbrine preparedinanattempttosimulatethebrinecompositionof variousHudsonRanchorothertestwellgeothermalbrines foundintheSaltonSea(Calif.,U.S.).Generaly,thesimu latedbrinehasacompositionofabout260ppmlithium, 63,000 ppm sodium, 20,100 ppm potassium, 33,000 ppm calcium,130ppmstrontium,700ppmzinc,1700ppmiron, 450ppmboron,54ppmsulfate,3ppmfluoride,450ppm ammoniumion,180ppmbarium,160ppmsilicon(reported assilicondioxide),and181,000ppmchloride.Additional elements,suchasmanganese,aluminum,antimony,chro mium,cobalt,copper,lead,arsenic,mercury,molybdenum, nickel,silver,thalium,andVanadium,mayalsobepresentin thebrine. As noted previously, the lithium aluminate intercalate (“LAI)matrixispreparedbymixingalithiumaluminum intercalate(LiCl:Al(OH))withapolymerorplasticmate rial.Typicaly,theLAImatrixincludesamajorportionofa lithiumaluminateintercalate(LAI),preparedaccordingto knownmethods,andaminorportionthatincludespolymeric orplasticmaterialthatservesasabinder.Incertainembodi ments,thematrixincludesatleast75%byweightoftheLAI. Incertainembodiments,thematrixincludesatleast80%by weightoftheLAI,anduptoabout20%byweightofthe plasticmaterial.Inalternateembodiments,thematrix includesatleastabout85%byweightoftheLAIandupto about15%byweightoftheplasticmaterial.Alternatively,the matrixcanincludeatleastabout90%byweightoftheLAI anduptoabout10%byweightoftheplasticmaterial.In certainembodiments,thematrixincludesbetweenabout 85-95%byweightoftheLAI,andbetweenabout5-15%by weightoftheplasticmaterial.Inalternateembodiments,the matrixincludesbetweenabout88-94%byweightoftheLAI, andbetweenabout6-12%byweightoftheplasticmaterial.In anexemplaryembodiment,theLAImatrixincludesabout 90%byweightLAIandabout10%byweightofthepolymer orplasticmaterial. Incertainembodiments,thematrixincludesatleast75% byvolumeoftheLAI.Incertainembodiments,thematrix includesatleast80%byvolumeoftheLAI,anduptoabout Broadly,inoneaspect,methodsforthepreparationof15 novelcompositionsofhighlylithiatedintercalatesoflithium salts,includinglithiumchlorideinanaluminahydrateforthe extractionoflithiumsalts,particularlylithiumhalides,from Solutions and brines that include said lithium salts, are describedherein.Asusedherein,lithiumsaltsincludelithium nitrates,lithiumsulfates,lithiumbicarbonate,lithiumhalides (particularlychloridesandbromides),andacidsalts.Inaddi tion,inanotheraspect,novelmethodsfortheselectiveextrac tionoflithiumhalidesfromsolutionsandbrinesthatinclude saidlithiumhalidesaredescribedherein. Thepresentinvention,incertainembodiments,providesan improvedlithiumaluminateintercalate(LAI)matrixforthe removalandrecoveryoflithiumfromsolutions,particularly geothermalandotherbrines.ThepresentlydescribedLAI matrixadvantageouslyprovidesthemaximumlithiumtoalu30 minumratio,therebyprovidingincreasedcapacityfor removalandrecoveryoflithium.Incertainembodiments,the LAI matrix has a mole fraction of lithium to aluminum of greaterthanabout0.3,preferablyabout0.3.Thehigherratio oflithiumtoaluminummaximizesthenumberoflithium35 sitesavailableinthematrixfortheloadingandunloadingof lithiumfromabrinesolution.Byproducingamaterialthat hasthemaximumlithiumtoaluminumratio,thealuminum hydroxidesubstratecanthenbreakdowntofineparticles,and wilnotexistasasingleintegralmass.Thefineparticles,40 whichstilretainamaximumlithiumtoaluminumratio,can haveanaveragediameteroflesthanabout80um,alterna tivelylesthanabout50lum,alternativelylesthanabout25 um,alternativelylesthanabout10um,alternativelylesthan about5um.Incertainembodiments,theparticulatematter45 hasadiameterofbetweenabout0.1and10um,alternatively betweenabout0.5and8um,alternativelybetweenabout1 and5um.Incertainembodiments,atleastabout50%ofthe particulatematterhasadiameteroflesthanabout2um, alternativelyatleastabout75%oftheparticulatematterhasa50 diameteroflesthanabout2um,alternativelyatleastabout 90%oftheparticulatematterhasadiameteroflessthanabout 2um.Incertainembodiments,theparticulatematterhasa bimodalsizedistribution,whereinthematerialhasafirstpeak distributionofabout50umandasecondpeakdistributionof55 about10um. Asusedherein,brinesolutioncanrefertoasolutionof alkaliand/oralkalineearthmetalsalt(s)inwater,whereinthe concentrationofsaltscanvaryfromtraceamountsuptothe pointofsaturation.Generaly,brinessuitableforthemethods60 describedhereinareaqueoussolutionsthatmayinclude alkalimetaloralkalineearthchlorides,bromides,sulfates, hydroxides,nitrates,andthelike,aswellasnaturalbrines. Exemplaryelementspresentinthegeothermalbrinescan include Sodium, potassium, calcium, magnesium, lithium, 65 strontium,barium,iron,boron,silicon,manganese,Zinc,alu minum,antimony,chromium,cobalt,copper,lead,arsenic, 25

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