Patent EXTRACTING LITHIUM CARBONATE FROM SALINE LAKE WATER

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Patent EXTRACTING LITHIUM CARBONATE FROM SALINE LAKE WATER ( patent-extracting-lithium-carbonate-from-saline-lake-water )

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US9,932,241B2 Thefinsareconfiguredtohavecanelureswhichwould whichaceleratesthecrystalization.Therecycledsteam furtherincreasethenon-uniformnucleationareaofLi,CO2, entersintothebrinepreheatingaparatus,makingmore promotethenucleationandcrystalizationofLi2CO3,and eficientuseoftheenergy. increasethecrystalizationeficiencyofLi2CO3. Theheaterisequipedaroundtheoutsideoftheiner Afterthevacum-pumpingaparatusisconected,the 5 containerwhichmakesthesalinelakebrineself-circulate vaporpresureofthebrinesurfacecanbefurtherdecreased anddevelopacountercurrentflowafterbeingheated,caus whichaceleratesthecrystalization.Therecycledsteam ingmoreuniformheating,whilelithiumcarbonatefouling entersintothebrinepreheatingaparatus,eficientlymaking onthewaloftheinercontainer,whichadverselyafects useoftheenergy. heatingeficiency,canbeavoided. Theheaterisequipedaroundtheoutsideoftheiner10 Duringoperation,thesalinelakebrineiscoledinbrine containerwhichmakesthesalinelakebrineself-circulate colingapparatus7.Preferably,filtratedlithium-richbrineis anddevelopacountercurentflowafterbeingheated,caus- pre-coledasitpasesthroughtheheatexchanger,which ingmoreuniformheating,whileavoidinglithiumcarbonate increasesthetemperatureofthelithium-richbrineatthe foulingonthewaloftheinercontainertoadverselyafects sametime.Subsequently,thelithium-richbrineentersinto heatingeficiency. 15thebrinepreheatingaparatus6tobepre-heated,andthen Aheatexchangerusedforpre-colingthesalinelake entersintotheinercontainer2ofthereduced-presure brineisequipedbetwenthebrinepreheatingaparatus evaporationcrystalizerviathebrineinlet32.Thenvacuum andthebrinecolingaparatus,inwhichthesalinelake pumpingapparatus5isswitchedontoreducethevapor brineisefectivelypre-cooled,andthelithium-richbrineis presureoftheinercontainer2,soastoacelerateevapo heatedupatthesametime.Thereby,theenergyconsump-20rationandcrystalization.Pumped-outsteamentersintothe tionrequiredforcolingandpreheatingcanbereduced. brinepreheatingaparatus6,andiscolectedbytheviapipe DESCRIPTION OF THEDRAWINGS Embodiment1 FIG.1isastructuralschematicdiagramofthedeviceof25 thepresentinvention; 1)ThebrineofNorthlakeofZhabuyesalinelaketaken FIG.2isastructuralschematicdiagramofthefinsofthe insummer(theconcentrationoflithiumionis0.78g/L,and deviceofthepresentinvention. theinitialtemperatureofthebrineis5oC.iscoledto-40° C.byindustrialfrezingsystem.Aftertheprecipitationof DETAILEDDESCRIPTION 30sodium chloride,potasium chloride,andaphthitalite,a solid-liquidseparationiscariedouttoobtainthelithium Thepresentinventionwilbefurtherilustratedbelow richbrine: withreferencetotheaccompanyingdrawingsandembodi 2)Theobtainedlithium-richbrineistransferedintothe ments. reduced-pressureevaporationcrystalizersafterbeingpre ReferingtoFIGS.1–2,asystem forquicklyextracting35heatedbythepreheatingaparatus,whereineachcrystal lithiumcarbonatefromsalinelakewater,comprisinga lizercontains30Lbrine; reduced-presureevaporationcrystalizer,avacum-pump- 3)Thebrineisquicklyheatedto60°C.,evaporatedata ingaparatus5,abrinepreheatingaparatus6andabrine reduced-presurefor5min,andthepressureofthecrystal coolingapparatus7.Thereduced-pressureevaporationcrys- lizerisbalancedat26kPa.After2hours,alithium-richsalt talizerhasanouterwall1,aninnercontainer2andanupper 40mixturehavingathicknessofabout2mm hasbeendepos cover3.Heater4isequippedbetweentheouterwall1and itedonthebotomofthecrystalizer,andtheresidualbrine theinercontainer2.Thetopoftheupercover3is isdischarged. equipedwithasteamoutlet31andabrineinlet32,the Thegradeofobtainedlithiumcarbonateinthemixtureis bottomofwhichisequippedwithseveraldetachablefins33. 95.2%,andtheprecipitationrateofthelithiumsaltis99.0%. Thesteamoutlet31isconnectedwiththevacuum-pumping45 Theoperationisruncontinuouslyforsevendaysfollow apparatus5whichconnectedwiththebrinepreheating ingtheaboveprocedure.Thegradeoflithiumcarbonate aparatus6,andthebrinepreheatingaparatus6iscon- obtainedfromthesaltcrystalizedinthereduced-presure nectedwiththebrinecolingapparatus7viapipes. evaporationcrystalizeris95.2% andthemixtureisof3.55 Asafurtherimprovementofthepresentinvention,the tons.Thetimerequiredforproducinglithiumcarbonateis fins33areconfiguredtohavecannelures. 50 1.97dayspertononaverage. Asafurtherimprovementofthepresentinvention,the heater4isequipedaroundoutsidetheinercontainer2.In Embodiment2 particular,theheaterisanelectricheater. Asafurtherimprovementofthepresentinvention,aheat 1)ThebrineofNorthlakeofZhabuyesalinelaketaken exchangerusedforpre-coolingsalinelakebrineisequipped 5insummer(theconcentrationoflithiumionis0.54g/L,and betwenthebrinepreheatingaparatusandthebrinecoling theinitialtemperatureofthebrineis8°C.)iscoledto-30° apparatus. C.usinganindustrialfrezingsystem.Afterprecipitationof Theelectricenergyusedinthesystemofthepresent sodiumchloride,potasiumchloride,andaphthitalite,a inventioncomesfromsolarpowerstation.Intheremote solid-liquidseparationiscariedouttoobtainthelithium plateauarea,theabundantsolarenergyresourcecanbeused 60 richbrine; efectively,which isgrenandenvironment-friendly. Thefinsareconfiguredtohavecanelureswhichfurther reduced-presureevaporationcrystalizersafterbeingpre increasethenon-uniformlynucleationareaofLi,CO2,pro- heatedbythepreheatingapparatus,whereineachcrystal motethenucleationandcrystalizationofLi,CO2,thereby lizercontains30Lbrine; increasethecrystalizationeficiencyofLi2CO3. 65 3)Thebrineisquicklyheatedto70°C.,evaporatedata Afterthevacuum-pumpingapparatusisconnected,the reduced-presurefor5min,andthepressureofthecrystal vaporpresureofthebrinesurfacecanbefurtherdecreased lizerisbalancedat36kPa.After2hours,alithium-richsalt 2)Theobtainedlithium-richbrineistransferedintothe

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