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locatedinQinghaiprovince requirementsofthefirsttime. TABLE 3 resultsoffourstagesolidliquidcros-flowextractionbytrihexylphosphatefrom anoldbrinewithamagnesium tolithiummassratioof52.6inasaltlakelocatedinQinghaiprovince E(Li+)/% E(Mg2+)/% m (Mg2+)/m (Lit) Stageof Single Acumulative Single Acumulative Single Accumulative m(Mg2+)/ extractionstage stages stage stages stage stages m(Lit) 47.21 47.21 16.26 16.26 18.11 18.11 83.41 49.26 73.22 15.90 29.58 26.92 21.24 138.26 56.17 88.26 15.29 40.34 37.62 24.04 267.24 AWNE 59.17 95.21 14.88 49.2 67.20 27.18 557.18 US 10,246,341B2 phasewasfinalyobtainedafterphaseseparation,witha decreasedmagnesiumtolithiumratio.Sampleswereana decreasedmagnesiumtolithiumratio.Sampleswereana- lyzedandresultsshowedthatreverseextractionrateofLi* lyzedandresultsshowedthatreverseextractionrateofLi* wasupto94.1%;reverseextractionrateofMg2+was wasupto81.5%;reverseextractionrateofMg2+was 93.1%;andamassratiomagnesiumtolithiumdeclinedto 55.1%;andamassratiomagnesium tolithium declinedto 5 26.8inthereserveextractedwaterphase.Condensationwas 4.2inthereserveextractedwaterphase.Intheconcentrated reverseextractedsolutionwithalowmagnesium tolithium majorityofMg2+,thensodiumhydroxidewasagainadded liquidseparation,reverseextractionandliquid-liquidsepa intothesolutionafterseparation,tocompletelyprecipitate 10 ration,untilthemagnesium tolithium ratiodeclinedbelow ratio,sodium carbonatesolutionwasaddedtoremove preparationofhalidesalts,solid-liquidextraction,solid magnesium.Solutionofsodiumcarbonatewasaddedinto 10.Sodiumcarbonatesolutionwasadedtoremovemajor thefilteredsolutiontoformprecipitation,andseparationand desiccationwerecariedouttoobtainalithiumcarbonate product. Embodiment3 350mLoftheoldbrineinembodiment1wastakeninto a1000mlbeakerandthemassratioofmagnesium to lithium inthemixturewasequalto52.58.Thebrinewas 20 heated forcondensation above atemperature adjustable ityofMg2+intheconcentratedreverseextractedsolution withalowmagnesiumtolithiumratio,thensodiumhydrox idewas again added into the solution afterseparation,to completelyprecipitatemagnesium.Solutionofsodium car bonatewasaddedintothefilteredsolutiontoform precipi tation,andseparationanddesicationwerecariedoutto obtain alithium carbonateproduct. Embodiment4 furnace.Waterwasevaporated,whichaccountedfor25%of totalmassofthebrine,andthesolutionwerechangedinto 350mLoftheoldbrineinembodiment1wastakeninto hydratedhalidesaltsaftercoling.Thesaltsweretransfered a1000mlbeaker,inwhich1.52gofLiCl.H,Owithits intoamechanicalmixingvesel,and354.7mLoftributyl25purityanalyzedof97% wasaded.Themassratioof phosphatewasaddedtoachieveamasstovolumeratio magnesiumtolithiuminthemixturewasequalto19.97.The equivalentto1:1(g/mL).Solid-liquidextractionwascaried solutionwasheatedforcondensationaboveatemperature outfor30minsunderroomtemperature.Thensolidliquid adjustablefurnace.Waterwasevaporated,whichaccounted mixtureswere transferred in asand core funneland vacuum for25 % oftotalmass ofthestartingbrine,and the solution filtrationwascariedout,andtheextractedorganic-phase 30werechangedintohydratedhalidesaltsaftercoling.The filtrate and remaining halide salts were obtained. The saltswere transferred into amechanicalmixing vessel,and remaininghalidesaltswereheatedandmeltedtocomple- 36.1mLoftributylphosphatewasaddedtoachieveamass tion.Thenthemeltedhalidesaltswerecoledandseparated tovolumeratioequivalentto1:1(g/mL).Solid-liquid out.Hydratedhalidesaltswereobtainedforthesecondtime. extractionwascariedoutfor30minsunderroomtempera Multiplestageextraction:2ndstage,3rdstageand4thstage35ture.Thensolidliquidmixturesweretransferedinasand extractionsweresucesivelycariedoutinacrosflow corefunnelandvacuumfiltrationwascariedout,andthe acordingtotheoperationrequirementsofthefirsttime. extractedorganic-phasefiltrateandremaininghalidesalts TheconcentrationsofLitandMg2+duringtheextraction were obtained.Theremaininghalidesaltswereheated and processweresampledandanalyzed.Theresultsareshown meltedtocompletion.Thenthemeltedhalidesaltswere intable.3. 40coledand separatedout.Hydratedhalidesaltswere Table.3resultsoffourstagesolidliquidcros-flow obtainedforthesecondtime.Multiplestageextraction:2nd extractionbytrihexylphosphatefromanoldbrinewitha stage,3rdstageand4thstageextractionsweresucesively magnesium tolithiummassratioof52.6inasaltlake cariedoutinacrosflowaccordingtotheoperation Theextractedphasesfrom fourstagesweremergedand TheconcentrationsofLitandMg2+duringtheextraction organicextractionphaseandwaterwererespectivelyadded 60 procesweresampledandanalyzed.Theresultsareshown in a separating funnel with a phase ratio of organic phase to waterV w equivalentto1:1andreverseextractionwas cariedout.Themixtureswerevibratedfor30minsrepeat Table.4resultsoffourstagesolidliquid cros-flow edlyinatemperature-constantcolingwaterbathSHA-2A extractionbytributylphosphatefromanoldbrinewitha at20°C.andataspedof200r/min.Thesolutionswere 65 thenplacedstilfor30minsandareverseextractedwater magnesiumtolithiummassratioof20.0inasaltlake phasewasfinalyobtainedafterphaseseparation,witha locatedinQinghaiprovince cariedoutinthereverseextractedwaterphase.Anew separationprocessforlithium andmagnesium wastakenby intable.4.PDF Image | PRODUCING LITHIUM CARBONATE FROM LOW LITHIUM BRINE
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