Patent LITHIUM CHLORIDE CONTAINING BRINE

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Patent LITHIUM CHLORIDE CONTAINING BRINE ( patent-lithium-chloride-containing-brine )

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US 2020/0399137A1 Dec.24,2020 8 embodiments,separatormeans72canbeabandfilteror tionofatleastabout15%byweight,morepreferablyatleast rotarydrum,andcanoptionalybefedthroughacounter about25%byweight,andevenmorepreferablyabout35% curentwashsystemfortheremovalofresidualsodium chloride.Separatormeans72canalsoincludewaterinlet72 byweight. [0082] Mixedstream82issupliedtocarbonationreactor/ andoutlet76forthewashingoftheseparatedsolidlithium absorber84,whichcanincludeaseriesoftrays,designedto carbonate.Separatormeans72canalsoincludemeansfor alowthemixedstream,whichincludeslithiumchlorideand dryingand/ortheremovalofwaterfromthesolidlithium sodiumhydroxide,tobesupliedtothetopofthereactor carbonate,includingforexample,centrifuge,heaters,blow ers,preses,andthelike.Separatormeans72canincludea vacuumfilterforremovalofwater.Incertainembodiments, itisdesirabletooptimizethewashingsteptobothmaximize andflowinadownwardfashionthroughthereactor,thereby alowingthemixedstreamtosuficientlycontactup-flowing carbondioxidegas4,whichcanbeintroducednearthe bottomofthereactorvialine2,toproducealithium purityofthelithiumcarbonatewhileminimizingtheamount carbonateslury90.Preferably,carbonationreactor/ab ofwaterusedforwashing.Sodiumchloridesolution76can berecycledtoelectrochemicalcel32forelectrolysis. 90°C.and100°C.Inalternateembodiments,reactor84can Lithiumcarbonateproduct74canhaveamoisturecontentof includevariousmixingmeansdesignedtofacilitatemixing lesthanabout5%byweight,preferablylesthanabout2% byweight,andevenmorepreferablylesthanabout0.5%by weight. ofliquidsandgases.Theconcentrationofthelithium carbonateispreferablyatleast15%byweight,morepref erablyatleast25%byweightlithiumcarbonate.Carbon [076]Thebrinesolution76fromseparatormeans72can dioxidecanberecycledtocarbonationreactor38vialine42. includesodiumchlorideandlithiumcarbonate.Generaly, dependingupontheamountofwaterutilizedintheproces andduringthewashproces,theratioofsodiumchlorideto vialine94.Asolutionthatincludessodiumchlorideand lithiumcarbonateisatleastabout20:1,morepreferablyat leastabout25:1,andevenmorepreferablyatleast30:1.In stream96. certainembodiments,theratioofsodiumchloridetolithium carbonateinthebrinesolutioncanbeabout35:1. solidlithiumcarbonateandaqueoussodiumchloride,is [07]Incertainembodiments,brinesolution76canbe supliedtoseparatormeans92,whichcanincludevarious acidifiedwithhydrochloricacid(notshown)toapHofles thanabout4,preferablyabout3,andrecycledtoelectro chemicalcel32.Thehydrochloricacidcanbesuplied fromelectrochemicalcel32. [0078] Thelithiumcarbonateproductionmethodproposed inFIG.4isadvantageousbecausetheproceseliminates,or nearlyeliminates,theproductionofwasteproducts.Spe cificaly,incertainembodiments,therecycleofunused metalsalts,forexamplesodiumchloride,andcarbondiox ide,theoveralyieldcanbequantitativeornearlyquanti tative. meansfortheseparationofsolidsfromliquidsincluding,for example,centrifuge,setlingtank,filters,screns,andthe like.Separatormeans92canalsoincludewaterinletsand outlets(notshown)forthewashingoftheseparatedsolid lithiumcarbonate.Separatormeans72canalsoinclude meansfordryingand/ortheremovalofwaterfromthesolid lithiumcarbonate,includingforexample,centrifuge,heat ers,blowers,preses,andthelike.Asolidsodiumcarbonate productiscolectedvialine94.Optionaly,aportionof sodiumchloridestream96canberecycledtoelectrochemi calcel32.Optionaly,thesodiumchloridesolutioncanbe [079]ReferingnowtoFIG.5,anotheralternateembodi recycledtothewashingstepofthelithiumextractionmedia. mentfortheproductionoflithiumcarbonateisprovided. Incertainembodiments,thesodiumchloriderequiredforthe Themethodisasinglestepproceswhereinsodiumcar procescanbegeneratedbytheselectivecrystalizationof bonateisproducedandreactedwithrecoveredlithium sodiumchloridefromthegeothermal,Smackover,orother chloride,howevermayrequireaditionalinputandpro brine. ducesawastelithiumchloridestreamthatmayincludesmal amountsoflithiumcarbonateentrainedtherein. [0085] ReferingtoFIG.10,inoneembodimentofthe presentmethod,lithiumchloridecontainingsolution10is [0080]Alithiumchloridestreamisprovidedasdescribed provided.Asnotedabove,lithiumchloridecontainingsolu aboveandasshowninFIG.3.Toelectrochemicalcel32 tion10canbeobtainedfromavarietyofsources,including sodiumchloridestream60isprovided.Sodiumchloride geothermalbrines.Thelithiumchloridecontainingsolution stream60issubjectedtoelectrolysistoproducesodium canbesupliedtosilicamanagementstep12,whichoper hydroxide62andchlorineandhydrogengases64,65, atestosignificantlyreducetheamountofsilicapresentin hydroxidestream62andlithiumchloridestream30canbe tion14islesthanabout150ppm,preferablytheconcen byknownmeans,suchasbyagitatorsormixers,with trationislesthanabout10ppm,morepreferablythe ultrasonicwaves,orbythelike.Mixer80producesmixed concentrationislesthanabout50ppm,andevenmore stream82,whichincludessodiumhydroxideandlithium preferablytheconcentrationislesthanabout25ppm.In chlorideinaqueoussolution.Incertainembodiments,itmay certainembodiments,theconcentrationofsiliconinsilica bepreferedthatlithiumchloridesteam30hasaconcen leanlithiumchloridecontainingsolution14islesthan trationofatleastabout20%byweight,morepreferablyat about20ppm,alternativelylesthanabout10ppm,alter leastabout28%byweight,andevenmorepreferablyabout nativelylesthanabout5ppm,alternativelylesthanabout 42%byweight.Similarly,incertainembodiments,itmaybe 3ppm,oralternativelylesthanabout1ppm.Incertain preferedthatsodiumhydroxidestream62hasaconcentra embodiments,itisunderstodthatthesilicaconcentrationis respectively. lithiumchloridecontainingsolution10,toproducesilicate [0081]Sodiumhydroxidestream62issupliedtomixer precipitate16andsilica-leanlithiumchloridecontaining 80,whereinthesodiumhydroxidestreamiscombinedand solution14.Aftersilicahasbeenremoved,thesilicon mixedwithlithiumchloridestream30.Mixingofsodium concentrationinsilica-leanlithiumchloridecontainingsolu sorber84ismaintainedatatemperatureofbetwenabout [083] Lithiumcarbonatesolution90issupliedtosepa rationvesel92whereinsolidlithiumcarbonateisproduced posiblyasmalamountoflithiumcarbonateisproducedas [084] Sodiumcarbonatesolution90,whichincludes

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