Yuav ua li cas yog txoj kev rau dismantling thiab recycling lithium hlau phosphate roj teeb? Ntawm cov roj teeb lithium hlau phosphate decommissioned, cov roj teeb uas tsis muaj nqi rau kev siv cov ntaiv thiab cov roj teeb tom qab siv cov ntaiv nkag mus rau theem disassembly thiab rov ua dua. Cov roj teeb lithium hlau phosphate txawv ntawm cov khoom siv roj teeb uas tsis muaj hlau hnyav thiab feem ntau yog siv los ntawm Li, P, thiab Fe. Tus nqi ntxiv ntawm cov khoom siv rov ua dua tshiab yog qhov tsawg, thiab cov txheej txheem rov ua dua tus nqi qis yuav tsum tau tsim.

Yuav ua li cas yog txoj kev rau dismantling thiab recycling lithium hlau phosphate roj teeb?

Ntawm cov roj teeb lithium hlau phosphate decommissioned, cov roj teeb uas tsis muaj nqi siv rau cov ntaiv thiab cov roj teeb tom qab siv cov ntaiv nkag mus rau theem disassembly thiab rov ua dua. Cov roj teeb lithium hlau phosphate txawv ntawm cov khoom siv roj teeb uas tsis muaj hlau hnyav thiab feem ntau yog siv los ntawm Li, P, thiab Fe. Tus nqi ntxiv ntawm cov khoom siv rov ua dua tshiab yog qhov tsawg, thiab cov txheej txheem rov ua dua tus nqi qis yuav tsum tau tsim. Feem ntau muaj ob txoj hauv kev rov ua dua tshiab: txoj kev pleev xim thiab kev coj ua.

Lithium hlau phosphate roj teeb

Cov txheej txheem kos duab rov ua dua txheej txheem

Cov txheej txheem kev kos duab ntawm lithium hlau phosphate roj teeb d yog feem ntau los hlawv cov electrode ntawm qhov kub thiab txias. Cov pa roj carbon thiab cov organic teeb meem nyob rau hauv cov hluav taws xob tawg yog hlawv, thiab cov hmoov tshauv uas tsis tuaj yeem raug tshuaj xyuas yog cov hmoov zoo uas muaj cov hlau thiab hlau oxides. Cov txheej txheem muaj cov txheej txheem yooj yim, tab sis muaj cov txheej txheem ua haujlwm ntev thiab tsis tshua muaj kev rov qab los ntawm cov roj thiab roj.

Kev txhim kho daim duab rov qab thev naus laus zis yog tshem tawm cov organic nplaum los ntawm calcination, thiab cais cov lithium hlau phosphate hmoov los ntawm txhuas ntawv ci kom tau txais cov khoom siv lithium hlau phosphate, thiab tom qab ntawd ntxiv cov khoom tsim nyog kom tau txais cov molar ratio ntawm lithium, hlau, thiab phosphorus. Synthesis ntawm lithium hlau phosphate tshiab los ntawm kub kub khoom theem txheej txheem. Hais txog tus nqi, cov roj teeb lithium hlau phosphate pov tseg tuaj yeem rov qab los ntawm kev txhim kho kev kos duab qhuav kom tau txais txiaj ntsig, tab sis raws li cov txheej txheem rov ua dua tshiab, cov txheej txheem tshiab lithium hlau phosphate muaj ntau yam impurities thiab kev ua haujlwm tsis ruaj khov.

cov txheej txheem ntub dej rov ua dua tshiab

Kev ntub dej rov qab ntawm lithium hlau phosphate roj teeb feem ntau dissolves cov hlau ions hauv lithium hlau phosphate roj teeb los ntawm cov kua qaub-puag, thiab tshem tawm cov hlau yaj hauv oxides, ntsev, thiab lwm yam, siv txoj hauv kev xws li nag lossis daus adsorption, thiab siv H2SO4, NaOH nyob rau hauv cov txheej txheem tshuaj tiv thaiv, H2O2 thiab feem ntau ntawm cov reagents. Cov txheej txheem ntub dej rov ua dua yog qhov yooj yim, cov khoom siv yuav tsum tsis siab, thiab nws yog qhov tsim nyog rau kev tsim khoom lag luam. Cov kws tshawb fawb tau kawm txog cov dej khib nyiab lithium-ion roj teeb tseem ceeb hauv Suav teb.

Qhov ntub dej rov ua dua ntawm lithium hlau phosphate roj teeb yog qhov tseem ceeb kom rov zoo. Thaum siv cov txheej txheem ntub dej kom rov qab tau cov lithium hlau phosphate cathode, aluminium ntawv ci tam sim no yuav tsum tau muab cais ua ntej ntawm cov khoom siv anode. Ib txoj hauv kev yog kom yaj cov khoom siv tam sim no nrog lye, cov khoom siv tsis muaj tshuaj lom nrog cov lye, thiab cov khoom nquag tuaj yeem tau los ntawm kev pom. Qhov thib ob yog cov kuab tshuaj organic, uas tuaj yeem yaj cov nplaum PVDF, cais cov khoom siv lithium hlau phosphate cathode los ntawm cov ntawv ci txhuas, thiab tom qab ntawd siv cov ntawv ci txhuas los ua cov khoom siv tom ntej. Cov organic hnyav tuaj yeem rov ua dua tom qab distillation. Piv nrog rau ob txoj kev, ob qho tib si ib puag ncig zoo thiab nyab xeeb dua. Ib qho ntawm kev rov qab los ntawm lithium hlau phosphate hauv anode yog kev tsim cov lithium carbonate. Txoj kev rov ua dua no muaj tus nqi qis thiab tau txais los ntawm feem ntau cov tuam txhab lithium hlau phosphate rov ua dua tshiab, tab sis cov khoom tseem ceeb ntawm lithium hlau phosphate (cov ntsiab lus 95%) tsis rov ua dua, ua rau cov khoom siv pov tseg.

Txoj kev ntub dej zoo tshaj plaws yog hloov cov khoom pov tseg lithium hlau phosphate cathode rau hauv lithium ntsev thiab hlau phosphate kom paub txog kev rov qab los ntawm tag nrho cov ntsiab lus ntawm Li, Fe, thiab P. Lithium hlau phosphate yuav tsum tau hloov mus rau lithium ntsev thiab hlau phosphate, thiab ferrous hlau yuav tsum tau oxidized rau trivalent hlau, thiab lithium yuav tsum tau leached nrog acid koob los yog alkaline soaking dej. Qee cov kws tshawb fawb tau siv oxidative calcination los cais cov txhuas flakes thiab lithium hlau phosphate, thiab tom qab ntawd leached los ntawm sulfuric acid cais cov hlau phosphate, thiab siv cov tshuaj raws li sodium carbonate rau impurity tshem tawm kom precipitate lithium carbonate.

Cov filtrate yog evaporated thiab crystallized nrog anhydrous sodium sulfate raws li ib tug by-product. Crude hlau phosphate tuaj yeem ua kom huv ntxiv rau cov roj teeb qib hlau phosphate thiab siv rau hauv kev npaj cov ntaub ntawv lithium hlau phosphate. Tom qab xyoo ntawm kev tshawb fawb, cov txheej txheem no tau dhau los ua neeg paub tab.