Patent PRODUCTION OF LITHIUM CARBONATE FROM BRINES

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Patent PRODUCTION OF LITHIUM CARBONATE FROM BRINES ( patent-production-lithium-carbonate-from-brines )

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5,993,759 9 10 obvious to one skilled in the art are intended to be included withintheScopeofthefollowingclaims. Iclaim: 1.Aprocessforproducinglithiumcarbonatefromnatural orindustrialbrines,whichcomprises: 7.Theprocessaccordingtoclaim1,whereinSaidremov ingstep(f)comprisesaddingsaidcalciumhydroxideasan aqueouscalciumhydroxideSolutioncontaining5to50%by weight of calcium hydroxide and maintaining a Sodium carbonate:calciumhydroxidemoleratiooffrom0.3:1to2:1. (a)acidifyingabrine,whichcomprisesatleastlithium, 8.Theprocessaccordingtoclaim7,whereinSaidpre magnesium,boronandwater,bymixinganacidthere withsoastomaintainapHoffrom0to4andtoform boricacid,SaidpHbeingmeasuredbydilutingthe acidifiedbrinewithwaterinaratioof1:10; 1O (b)removingSaidboricacidbycrystalizationandsepa ratingboricacidcrystalsfromSaidbrinetoproducea boron-depletedbrine; (c)removingresidualboronfromsaidboron-depleted brinebytreatingSaidbrinewithanorganicextractant15 totherebyproduceaboron-freebrine; (d)dilutingsaidboron-frebrinewithatleastaportionof amotherliquorgeneratedinalithiumcarbonatepre cipitationStep; (e) removing magnesium from Said diluted brine by addingSodiumcarbonatetheretoandprecipitatingand Separatingmagnesiumcarbonatetherefromtoforma magnesium-depleted brine, said removing Step (e) resultsintheremovalof60to95%,byweight,ofthe25 magnesiumcontainedinSaiddilutedbrine; (f)removingresidualmagnesiumfromsaidmagnesium depletedbrinebyaddingcalciumhydroxidetheretoand precipitating and Separating magnesium hydroxide therefromtoformamagnesium-freebrine; (g)addingSodiumcarbonatetoSaidmagnesium-free brinetoformandprecipitatelithiumcarbonate; (h)separatingsaidlithiumcarbonatefromSaidbrineto therebyobtainalithiumcarbonatecakeandSaid35 motherliquorhavingalithiumcontentof0.1to0.3%, byweight. 2.Theprocessaccordingtoclaim1,whereinSaidboron frebrinehasalithiumcontentof4to6%,byweight. 3.Theprocessaccordingtoclaim1,whereinSaiddiluting40 step(d)resultsinalithiumcontentof0.9to1.5%,byweight. 4.Theprocessaccordingtoclaim1,whereinSaidremoval Step(e)comprisesreactingsaidSodiumcarbonatewithsaid magnesiumatapHof7to9,atatemperatureof15to95 C.,andforadurationof5to120minutes. 45 cipitationofmagnesiumhydroxideinsaidremovingstep(f) iscariedoutatatemperatureoffrom50to95C.,atapH offrom8to10,andforadurationof5to180minutes. 9.Theprocessaccordingtoclaim1,whichfurthercom prises thickening the magnesium hydroxide-containing brineproducedinStep(f)priortoseparatingsaidmagne siumhydroxidetherefrombyfiltration. 10. The process according to claim 9, wherein said thickeningStepproducesaclearbrinewhichisSubsequently combinedwiththemagnesium-freebrinegeneratedinSaid filteringStep. 1.Theprocessaccordingtoclaim1,whereinSaidlithium carbonateisprecipitatedinSaidstep(g)whilemaintaining apHof8to12,atatemperatureof50to98 C.fora retention time of 5 to 180 minutes. 12. The process according to claim 1, wherein Said precipitatingstep(g)resultsintheprecipitationof40to90% ofthelithiumcontainedinthemagnesium-freebrine. 13. The process according to claim 1, wherein Said precipitatingstep(g)resultsintheprecipitationof80to90% ofthelithiumcontainedinthemagnesium-freebrine. 14. The process according to claim 1, wherein Said SeparatingStep(h)comprisesSubjectingsaidlithiumcar bonateprecipitate-containingbrinetoaSolid/liquidSepara tortoobtainSaidmotherliquorandalithiumcarbonatecake andwashingSaidcakewithSoftwateratatemperatureof from60to98 C. 15. The process according to claim 1, wherein Said SeparatingStep(h)comprisesSubjectingsaidlithiumcar bonateprecipitate-containingbrinetoatleastonehydrocy clonetreatmenttoobtainadensepulpoflithiumcarbonate andaliquidwhichcontainslithiumcarbonate,andSubject ingSaiddensepulptoaliquid/solidSeparationtreatmentto thereby obtain lithium carbonate cake and Said mother liquor. 16. The process according to claim 15, which further comprisesthickeningSaidliquidwhichcontainslithium carbonateandreturningSaidthickenedliquidtoSaidhydro cyclonetreatment. 17. The process according to claim 15, which further compriseswashingSaidlithiumcarbonatecakewithSoft wateratatemperatureoffrom60to98C. 5.Theprocessaccordingtoclaim1,whichfurthercom prisesthickeningthemagnesiumcarbonate-containingbrine producedinStep(e)priortoseparatingsaidmagnesium 18.Theprocessaccordingtoclaim17,whereinfiltrate carbonate therefrom. 6.Theprocessaccordingtoclaim5,whereinSaidthick50 eningStepproducesaclearbrinewhichisSubsequently combined with the magnesium-depleted brine from Said filteringStep. resultingfromSaidwashingisusedforpreparingaSodium carbonateSolutionwhichisusedforprovidingSaidSodium carbonateofsteps(e)and(g). k k k k k

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Product and Development Focus for Infinity Turbine

ORC Waste Heat Turbine and ORC System Build Plans: All turbine plans are $10,000 each. This allows you to build a system and then consider licensing for production after you have completed and tested a unit.

Redox Flow Battery Technology: With the advent of the new USA tax credits for producing and selling batteries ($35/kW) we are focussing on a simple flow battery using shipping containers as the modular electrolyte storage units with tax credits up to $140,000 per system.

Our main focus is on the salt battery. This battery can be used for both thermal and electrical storage applications.

We call it the Cogeneration Battery or Cogen Battery.

One project is converting salt (brine) based water conditioners to simultaneously produce power.

In addition, there are many opportunities to extract Lithium from brine (salt lakes, groundwater, and producer water).

Salt water or brine are huge sources for lithium. Most of the worlds lithium is acquired from a brine source. It's even in seawater in a low concentration. Brine is also a byproduct of huge powerplants, which can now use that as an electrolyte and a huge flow battery (which allows storage at the source).

We welcome any business and equipment inquiries, as well as licensing our turbines for manufacturing.

CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)