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TABLE 1 resultsoffourstagesolidliquidcros-flowextractionbytrihexylphosphatefrom anoldbrinewithamagnesium tolithiummassratioof52.6inasaltlakelocatedinQinghaiprovince E(Li+)/%a E(Mg2+)/% mM(g2+)/m(Lit) Stageof Single Single Acumulative Single Accumulative m(Mg2+)/ extraction stage Accumulative stage stages stage stages m (Lit)d 21.91 21.91 4.75 4.75 11.40 11.40 64.14 US 10,246,341B2 Table.1resultsoffourstagesolidliquidcros-flow magnesiumtolithiuminthemixturewasequalto20.00.The extractionbytrihexylphosphatefromanoldbrinewitha solutionwasheatedforcondensationaboveatemperature magnesiumtolithiummassratioof52.6inasaltlake adjustablefurnace.Waterwasevaporated,whichacounted locatedinQinghaiprovince for25%oftotalmassofthestartingbrine,andthesolution 27.03 67.59 4.86 17.87 18.36 13.90 133.28 Hnmt wherein, astandsforextractionrateofLit; bstandsforextractionrateofMg+; 'standsformassratioofmagnesium tolithium inorganicphase; astandsformassratioofmagnesium tolithiumintheremaininghalidesalts. Themeaningofsymbolisthesameinfollowingtables. Theextractedphasesfromfourstagesweremergedand werechangedintohydratedhalidesaltsaftercoling.The organicextractionphaseandwaterwererespectivelyadded 25 saltsweretransferedintoamechanicalmixingvesel,and 23.45 40.22 4.77 9.30 13.05 12.15 79.79 25.71 55.59 4.83 13.67 14.98 12.93 102.21 inaseparatingfunelwithaphaseratiooforganicphaseto waterV/Vw equivalentto1:1andreverseextractionwas 36.8mLoftrihexylphosphatewasaddedtoachieveamass volume ratio equivalentto 1:1(g/mL ).Solid-liquid extrac tionwascariedoutfor30minsunderroom temperature. cariedout.Themixtureswerevibratedfor30minsrepeat Thensolidliquidmixturesweretransferedinasandcore edlyinatemperature-constantcolingwaterbathSHA-2A30funelandvacum filtrationwascariedout,andthe at20°C.andataspedof200r/min.Thesolutionswere thenplacedstilfor30minsandareverseextractedwater phasewasfinalyobtainedafterphaseseparation,witha extracted organic-phase filtrate and remaining halide salts wereobtained.Theremaininghalidesaltswereheatedand melted to completion . Then the melted halide salts were coled and separated out.Hydrated halide saltswere decreasedmagnesium tolithiumratio.Sampleswereana35obtainedforthesecondtime.Multiplestageextraction:2nd lyzedandresultsshowedthatreverseextractionrateofLit stage,3rdstageand4thstageextractionsweresucesively isupto80.3%;reverseextractionrateofMg2+was56.0%; cariedoutinacrosflowacordingtotheoperation andamassratiomagnesiumtolithiumdeclinedto9.7inthe requirementsofthefirsttime. reserve extracted water phase.In the concentrated reverse extractedsolutionwithalowmagnesium tolithiumratio 40processweresampledandanalyzed.Theresultsareshown sodiumcarbonatesolutionwasaddedtoremovemajorityof Mg2+,thensodium hydroxidewasagainadedintothe solutionafterseparation,tocompletelyprecipitatemagne magnesiumtolithiummassratioof20.0inasaltlake sium.Solutionofsodiumcarbonatewasadedintothe locatedinQinghaiprovince TABLE2 resultsoffourstagesolidliquidcros-flow extractionbytributylphosphatefrom anoldbrinewithamagnesiumtolithiummassratioof20.0inasaltlakelocatedinQinghaiprovince E(Li+)/% _ E(Mg2+)/% m(Mg2+)/m,(Lit) Stageof Single Acumulative Single Acumulative Single Acumulative m(Mg2+)/ extraction stage stages stage stages stage stages m(Lit) 18.00 18.00 5.31 5.31 5.90 5.90 23.09 19.64 34.11 5.10 10.14 6.00 5.95 27.26 AWN 22.34 48.83 5.16 14.78 6.30 6.05 33.29 25.13 61.69 4.94 19.00 6.55 6.16 42.27 filteredsolutiontoformprecipitation,andseparationand60 Theextractedphasesfromfourstagesweremergedand desicationwerecariedouttoobtainalithiumcarbonate organicextractionphaseandwaterwererespectivelyadded product. in a separating funnelwith a phase ratio of organic phase to water V /V ,equivalent to 1:1and reverse extraction was Embodiment2 carriedout.Themixtureswere vibrated for30mins repeat 350mLoftheoldbrineinembodiment1wastakeninto65edlyinatemperature-constantcolingwaterbathSHA-2A a10mLbeaker,inwhich11.49gofLiC1.H20withits at20°C.andataspedof20r/min.Thesolutionswere purityanalyzedas97%wasadded.Themassratioof thenplacedstilfor30minsandareverseextractedwater TheconcentrationsofLitandMg2+duringtheextraction intable.2. Table. 2 results of four stage solid liquid cross-flow extraction by tributylphosphate from an old brinewith aPDF Image | PRODUCING LITHIUM CARBONATE FROM LOW LITHIUM BRINE
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