Graphite: Lub Lag Luam Dub Kub Nrog Ib Tus Cwj Pwm Zoo

Ntuj graphite yog ib yam tsis yog -hlau ntxhia uas muaj cov ntsiab lus carbon. Nws yog qhov tshwm sim los ntawm kev sib xyaw ua ke ntawm sedimentation thiab metamorphism thaum lub sijhawm geological keeb kwm. Nws cov txheej txheem tsim feem ntau muaj ob theem: cov pa roj carbon- nplua nuj sediment tsub zuj zuj thiab theem metamorphic mineralization. Cov qub muab cov nplua nuj ntawm cov pa roj carbon monoxide rau kev tsim cov graphite, thaum tom kawg ua tiav qhov kev hloov pauv ntawm cov pa roj carbon monoxide mus rau graphite.

Ntuj graphite yog tsim los ntawm cov tshuaj carbon nyob rau hauv cov xwm. Cov peev txheej ntawm cov khoom siv carbon tuaj yeem muab faib ua cov organic carbon thiab inorganic carbon. Ntawm lawv, cov organic carbon dominates, feem ntau yog los ntawm cov nroj tsuag algae thiab microfossils nyob rau hauv thawj dej hiav txwv, nrog rau lwm cov pa roj carbon - muaj cov residues. Cov pa roj carbon inorganic suav rau qhov feem me me, feem ntau yog los ntawm cov pa roj carbon - muaj cov khoom tsis muaj zog xws li cov pob zeb carbonate tsim nyob rau hauv ib puag ncig marine. Thawj cov organic carbon thiab inorganic carbon sib sau ua ke thiab muab faus rau ntawm ntug hiav txwv, tsim cov khaubncaws sab nraud povtseg uas nplua nuj nyob hauv cov khoom carbon.

Tom qab muaj cov sedimentary txaus, cov ntaub ntawv carbonaceous xav tau qee qhov kub thiab txias kom hloov mus rau graphite. Txoj kev hloov pauv no tseem hu ua graphitization txheej txheem. Thaum lub sij hawm txav ntawm lub ntiaj teb tectonic daim hlau, cov pa roj carbon- nplua nuj sedimentary txheej hauv dej hiav txwv maj mam txav mus rau qhov tob ntawm lub pob zeb. Qhov chaw kaw nrog qhov kub thiab txias ua rau cov ntaub ntawv carbonaceous tawg mus rau hauv cov ntaub ntawv graphite nuclei sai sai, thiab tom qab ntawd maj mam sib sau ua ke thiab loj hlob mus rau graphite crystals. Ntawm lawv, qhov kub thiab txias yog qhov tseem ceeb rau kev hloov pauv ntawm cov ntaub ntawv carbonaceous rau hauv graphite, thiab lub sij hawm loj hlob siv lead ua yog qhov tseem ceeb hauv qib ntawm graphitization.

Ntuj graphite yog dav faib thoob ntiaj teb thiab muaj ntau reserves. Lub "2024 Mineral Commodity Summary" tso tawm los ntawm Tebchaws Meskas Geological Survey qhia tau hais tias txij li thaum kawg ntawm 2022, lub ntiaj teb pov thawj reserves ntawm ntuj graphite yog kwv yees li 280 lab tons. Tuam Tshoj cov nyiaj khaws cia yog kwv yees li 810 lab tons, suav txog kwv yees li ib feem peb ntawm tag nrho lub ntiaj teb. Lub ntiaj teb graphite ntau lawm hauv 2023 yog kwv yees li 1.6 lab tons, thiab Tuam Tshoj cov khoom lag luam yog kwv yees li 1.23 lab tons, suav txog kwv yees li 77% ntawm tag nrho lub ntiaj teb cov khoom tsim tawm, ua rau Tuam Tshoj yog lub ntiaj teb ua lag luam graphite.

Ntuj graphite yog dav hlau dub nyob rau hauv cov xim thiab nplua nyob rau hauv kev ntxhib los mos. Raws li qhov sib txawv ntawm nws daim ntawv crystalline, nws tuaj yeem muab faib ua crystalline graphite thiab amorphous graphite.

Cov crystalline graphite muaj cov khoom siv lead ua zoo thiab cov muaju tuaj yeem pom ntawm qhov muag liab qab. Nws tuaj yeem raug cais ntxiv rau hauv flake graphite thiab block graphite. Thaum ib txheej ntawm graphite tau sib xyaw ua ke, lawv tsim ntses - nplai- zoo li flake graphite. Yog tias qhov kev npaj tsis raug cai, qhov ntom ntom graphite yuav raug tsim.

Lub cryptocrystalline graphite crystals yog me me heev thiab zoo li av -zoo li cov khoom. Lawv cov duab siv lead ua tsuas tuaj yeem pom meej meej nrog kev pab ntawm lub tshuab ntsuas hluav taws xob, yog li lawv tseem hu ua av -zoo li graphite.

Daim ntawv siv lead ua ntawm ntuj graphite yog ze ze rau nws cov nqi lag luam. Feem ntau hais lus, qhov zoo dua qhov crystallization degree, siab dua cov yam ntxwv zoo. Yog li ntawd, flake graphite feem ntau muaj superior zog thiab daim ntawv thov nqi piv rau lwm hom graphite.

Raws li kev faib tawm ntawm cov zaub mov raws li lawv daim ntawv crystalline, graphite deposits tuaj yeem muab faib ua peb hom: hom metamorphic hauv cheeb tsam, hu rau hom metamorphic, thiab magmatic hydrothermal hom, raws li keeb kwm ntawm geological thiab tej yam kev mob thaum lub sij hawm tsim ntawm graphite.

Regional metamorphic graphite deposits feem ntau yog tsim los ntawm lub regional metamorphism ntawm ancient carbon-muaj sedimentary strata vim tectonic txav. Lawv feem ntau tsim loj - qhov loj thiab siab - zoo flake graphite. Txawm hais tias cov ore qib qis, cov deposits no muaj cov nplai loj thiab cov nqi lag luam yog qhov siab tshaj plaws.

Kev sib cuag metamorphic graphite deposit yog tsim thaum magma intrudes rau hauv cov thee-cov kabmob strata thiab cov pa roj carbon nyob rau hauv cov thee txheej dhau mus metamorphism. Nws tseem hu ua thee - bearing graphite. Lub graphite crystallization℃yog qhov tsawg, nthuav tawm li microcrystalline lossis cryptocrystalline. Cov qib ore yog qhov siab, ncav cuag 60% mus rau 90%.

Magma hydrothermal graphite deposits yog tsim los ntawm kev ua kom txias thiab crystallization ntawm carbon -muaj magma kua. Lawv feem ntau ntawm cov nplai me me, nrog cov pob zeb tsis sib xws, qhov hloov pauv tseem ceeb hauv qib ntawm graphite crystallization, thiab feem ntau yog nruab nrab mus rau nplua graphite. Qib ore yog qhov tsawg.

Cov qauv tshwj xeeb ntawm ntuj graphite endows nws nrog ntau yam khoom zoo heev, thiab tseem nthuav dav nws daim ntawv thov kev lag luam hauv kev lag luam.

Kev ntxhib los mos:Graphite muaj qhov zoo heev -kub tsis kam. Nws cov ntsiab lus melting yog ze rau 4,000℃thiab nws qhov kub ntawm qhov kub nce mus txog 4,250 degree. Graphite yog ib qho atomic siv lead ua, thiab covalent ib daim ntawv cog lus ntawm carbon atoms yog cov tshuaj muaj zog heev uas yuav tsum tau muaj zog heev kom tawg. Yog li ntawd, cov ntsiab lus melting ntawm graphite yog siab heev, thiab nws muaj kev poob qis txawm tias nyob rau hauv qhov kub siab heev. Yog li, hauv kev lag luam xws li metallurgy thiab casting, graphite tuaj yeem siv los tsim magnesium-carbon refractory cib thiab siab- kub- resistant graphite crucibles.

Tshuaj tiv thaiv: Graphite muaj cov khoom tiv thaiv zoo heev - corrosion. Nws tuaj yeem tiv taus qhov yaig ntawm ntau yam muaj zog acids, muaj zog hauv paus thiab cov organic daws teeb meem. Ntxiv mus, graphite muaj qhov tsis tshua muaj "affinity" rau feem ntau cov tshuaj daws teeb meem, thiab nws qhov chaw tsis yooj yim rau scaling. Nws tuaj yeem siv rau hauv kev lag luam chemical los tsim cov khoom siv siab -purity corrosion- cov khoom siv tiv thaiv, xws li cov kav dej tshuaj, cov tshuaj tiv thaiv tank, combustion towers, thiab lwm yam.

Lubricity zoo:Graphite yog cov roj nplua nyeem uas muaj keeb kwm ntev ntawm kev siv. Nws cov txheej txheej txheej uas yooj yim rau swb muab nws zoo heev lubrication zog. Tom qab adsorbing gases thiab dej vapor nyob rau hauv cov huab cua, qhov kev ncua deb ntawm graphite khaubncaws sab nraud povtseg nce, ua rau nws yooj yim rau swb thiab ntxiv txhim khu nws cov lubrication kev ua tau zoo. Yog li ntawd, hauv kev lag luam xws li kev tsim khoom siv tshuab, graphite tuaj yeem siv los ua cov roj nplua nyeem los pab tshem tawm cov pwm los ntawm cov hlau, los yog nws tuaj yeem ua ke nrog lwm cov hlau los ua cov roj- dawb lubricating bearings thiab lwm yam khoom sib txhuam. Nws kuj yog ib qho uas feem ntau siv cov roj nplua nyeem hauv lub neej txhua hnub los daws qhov teeb meem xeb ntawm lub xauv cores.

Hluav taws xob conductivity:Graphite yog ib qho khoom siv uas tsis yog -nws yog xim hlau conductive, uas muaj feem xyuam rau cov txheej txheem electron ntawm carbon atoms hauv graphite. Txhua carbon atom muaj 4 electrons nyob rau hauv nws txheej txheej. Hauv honeycomb-zoo li txheej txheej txheej ntawm graphite, txhua cov pa roj carbon atom siv 3 electrons los txuas nrog lwm 3 carbon atoms nyob ib ncig ntawm nws los tsim cov ntawv cog lus. Yog li ntawd, txhua cov pa roj carbon atom yuav muaj ib qho hluav taws xob dawb ntxiv los ua hluav taws xob, uas ua rau graphite muaj kev ua tau zoo heev. Yog li, graphite yog siv dav hauv kev lag luam hluav taws xob thiab feem ntau yog siv los ua cov filament ntawm siab - siv lub teeb qij, carbon rods, txhuam, thiab lwm yam, los yog siv raws li electrodes nyob rau hauv me me electrode carbon raj, zoo electrodes ntawm mercury rectifiers, vuam carbon, xov tooj accessories thiab lwm yam khoom.

Tsis tas li ntawd, qhov ruaj khov lub cev thiab cov khoom siv tshuaj lom neeg ntawm graphite txiav txim siab nws qhov tsim nyog raws li cov tshuaj tiv thaiv retardant thiab zoo insulator. Qhov no tau ua rau nws tau siv dav hauv kev txiav - ntug kev lag luam xws li cov khoom siv hauv kev lag luam nuclear thiab cov khoom siv dav hlau. Nyob rau hauv plaub - tiam siab -kub roj- txias reactors tam sim no nyob rau hauv kev lag luam lag luam nyob rau hauv Tuam Tshoj, ruaj khov graphite yog siv los ua retardant rau lub reactors.

Qhov sib txawv ntawm ob hom "kev lag luam dub kub" hom

Ntuj graphite thiab thee yog ob yam khoom uas muaj cov ntsiab lus carbon, thiab ob qho tib si hu ua "kev lag luam dub kub". Txawm li cas los xij, lawv txawv ntau yam hauv cov khoom siv thiab tsim ua, thiab lawv kuj muaj lawv tus kheej qhov zoo ntawm cov ntawv thov kev lag luam.

Los ntawm cov qauv kev xav, ntuj graphite thiab thee sib txawv heev. Ntuj graphite yog cov ntxhia ntshiab uas muaj cov ntsiab lus carbon, nrog cov pa roj carbon atoms txheej txheem txheej txheem thiab cov qauv siv lead ua zoo ib yam. Coal, ntawm qhov tod tes, yog sib xyaw ntawm ntau yam xws li carbon, hydrogen, thiab oxygen. Cov pa roj carbon atoms ua ke nrog lwm cov atoms los tsim cov organic molecules sib txawv, uas yog randomly ua ke nrog inorganic tebchaw, ua rau ib tug complex thiab tsis meej pem. Yog li ntawd, lub cev thiab tshuaj lom neeg cov khoom ntawm graphite muaj ntau ruaj khov dua li cov thee. Nws qhov ignition point, melting point, thiab thermal conductivity yog tag nrho ntau dua li cov thee. Qhov no yog vim li cas txawm hais tias ob qho tib si muaj cov pa roj carbon ntau, cov thee tuaj yeem siv los ua roj thaum graphite tsis tuaj yeem.

Los ntawm qhov kev xav ntawm qhov ua rau, txawm hais tias ob qho tib si ntuj graphite thiab thee yog cov khoom ntawm sedimentation thiab metamorphism ntawm cov nroj tsuag thaum ub, qhov tsim ntawm graphite yuav tsum muaj siab - kub thiab siab - siab metamorphism nyob rau hauv qhov tob ntawm lub ntiaj teb crust, qhov twg carbon tuaj yeem tsim graphite crystals. Thee tsuas yog yuav tsum tau mus rau hauv qhov chaw ntiav ntawm lub ntiaj teb crust los tsim lignite, thiab undergo ib tug tsawg℃ntawm metamorphism los ua bituminous thee thiab anthracite. Yog tias qhov kub thiab txias tseem nce ntxiv, kev hloov pauv ntawm cov thee mus rau graphite kuj tuaj yeem tshwm sim. Piv txwv li, hu rau metamorphic thee- hom graphite yog tsim thaum txheej anthracite yog intruded los ntawm magma thiab undergoes siab - kub metamorphism.

Hauv cov ntawv thov kev lag luam, ntuj graphite txawv ntawm cov thee. Ntuj graphite feem ntau yog siv los ua cov khoom siv raw los tsim cov khoom siv tshuab thiab cov pa roj carbon-raws li cov ntaub ntawv. Coal, ntawm qhov tod tes, tsuas yog siv rau kev sib txuas rau kev siv hluav taws xob thiab kev rho tawm cov organic sib txuas, xws li hauv kev tsim hluav taws xob, kev tsim hluav taws xob, thiab kev tsim cov methanol, ammonia crude, thiab lwm yam.

Lub advent ntawm lub tshiab puag ncig ntawm lub ntiaj teb no kev lag luam kiv puag ncig tau coj tshiab lub sij hawm thiab kev cov nyom rau kev tshawb fawb thiab kev siv ntawm graphite. Nrog rau kev txhim kho thev naus laus zis thiab kev txhim kho kev lag luam, kev ua haujlwm siab ntawm graphite tau ua tiav kev ua tiav tas li, cov khoom ntawm graphite tau tsim thiab siv tau zoo, thiab kev lag luam graphite tau pib txhim kho mus rau qib siab - thev naus laus zis. Cov khoom siv graphite tshiab tau tshwm sim, xws li hloov tau graphite, kheej kheej graphite, graphene, thiab lwm yam.

Saj zawg zog graphite yog tsim los ntawm cua sov sai thiab nthuav dav ntuj flake graphite los ntawm kev ua tshuaj tshwj xeeb. Vim nws cov txheej txheem nthuav dav, nws tseem hu ua nthuav graphite. Flexible graphite tsis tsuas yog txais cov khoom zoo ntawm cov graphite ntuj tab sis kuj nthuav nws cov softness, resilience, thiab adsorption zog. Nws tuaj yeem ua haujlwm nyob rau hauv qhov kub thiab txias, kev kub ntxhov, lossis hluav taws xob thiab tuaj yeem siv los ua cov nplaim hluav taws thiab cov khoom sib khi. Siv nws cov yam ntxwv hydrophobic thiab oleophilic, nws tuaj yeem siv los ua ib qho adsorbent los kho cov roj- cov khoom siv, feem ntau siv los tuav cov roj av tawm thiab cov dej khib nyiab; Nws tseem tuaj yeem tshem tawm cov khoom uas muaj cov roj soluble hauv cov roj, xws li tshuaj tua kab thiab qee cov organic lossis inorganic teeb meem, los yog siv los tshem tawm cov teeb meem hauv cov pa hluav taws xob thiab tsheb tso pa tawm.

Spherical graphite yog tau los ntawm kev siv txhua yam thiab lub cev txoj hauv kev los sphericalize lub ntuj flake graphite. Cov duab kheej kheej endows nws nrog cov khoom siv hluav taws xob zoo heev, kev them nqi thiab kev tso tawm, thiab lub voj voog lub neej, ua rau nws yog ib qho zoo tagnrho cov khoom siv hluav taws xob tsis zoo rau lithium - ion roj teeb. Nyob rau hauv xyoo tas los no, kev siv lithium{3}} roj teeb ion hauv cov khoom siv hluav taws xob xws li khoos phis tawj, kev sib txuas lus, thiab kev lom zem tau loj hlob sai. Nrog rau kev nthuav dav sai ntawm kev lag luam tsheb hluav taws xob huv thiab ib puag ncig zoo, qhov kev thov rau siab -kev ua tau zoo lithium- ion roj teeb tau nce ntxiv, uas nyob rau hauv lem tau tsav qhov kev thov thiab kev loj hlob ntawm kheej kheej graphite.

Ntawm tag nrho cov hom tshiab ntawm graphite cov ntaub ntawv tam sim no, graphene yog undoubtedly "dub nees" ntawm cov ntaub ntawv, ua rau ib tug tshiab nthwv dej ntawm daim ntawv thov rau graphite thiab tiag tiag sawv cev rau ib tug tshiab hom ntawm tsim muaj zog.

Graphene yog ib daim ntawv -txheej txheej- zoo li cov khoom tsim los ntawm carbon atoms, tseem hu ua monolayer graphite. Txawm hais tias nws cov tuab tuab heev, nws muaj lub zog siab heev, nrog rau cov khoom siv hluav taws xob zoo heev, thermal conductivity, thiab malleability, ua rau nws muaj nuj nqis heev hauv ntau yam xws li physics, chemistry, biology, thiab lub zog. Los ntawm kev siv cov khoom zoo tshaj plaws ntawm graphene, cov khoom lag luam siab heev thiab cov khoom siv hluav taws xob xws li graphene composite anti-corrosion coatings, heat dissipation film material, flexible display devices, and sensing sensors can be made. Nyob rau yav tom ntej, graphene yuav muaj kev cia siab dav hauv thaj chaw xws li biomedicine, optics, electronics, thiab ib puag ncig, thiab xav tias yuav ua rau muaj kev cuam tshuam kev cuam tshuam hauv cheeb tsam semiconductor, dhau los ua cov khoom siv tseem ceeb rau tom ntej - tiam circuits thiab supercomputers.

Nyob rau hauv cov ntsiab lus ntawm kev nruam hauv - kev tshawb fawb tob ntawm graphite cov ntaub ntawv, ntau dua tshiab thiab siab -kev ua tau zoo graphite- cov ntaub ntawv yuav tsum tshwm sim yav tom ntej, ua lub luag haujlwm tseem ceeb hauv kev txhawb nqa kev lag luam, txhim kho lub zog ua haujlwm, thiab tiv thaiv ib puag ncig. Kev tshawb fawb tam sim no qhia tau hais tias qhov zoo ntawm ntuj graphite ncaj qha cuam tshuam rau kev ua haujlwm thiab kev siv cov ntaub ntawv tshiab npaj los ntawm nws. Qhov zoo dua qhov zoo thiab purity ntawm ntuj graphite, qhov zoo dua ntawm kev npaj cov ntaub ntawv tshiab. Nyob rau hauv lub neej yav tom ntej, lub teb ntawm lub zog tshiab, cov ntaub ntawv tshiab, kev lag luam tiv thaiv lub teb chaws, thiab aerospace, uas siv cov kev txiav -ntug graphite cov ntaub ntawv, yuav muaj kev xav tau ntau dua rau siab - cov khoom siv graphite zoo. Raws li qhov loj tshaj plaws thiab cov tsim khoom ntawm ntuj graphite nyob rau hauv lub ntiaj teb no, Tuam Tshoj yuav tsum txuas ntxiv mus ntxiv dag zog rau graphite kev tshawb fawb, siv ntau txoj kev los ua kom tiav kev tshawb fawb tob -seed minerals thiab txhim kho siab - cov peev txheej zoo, thiab tso siab rau qhov no, ntxiv dag zog rau kev txhim kho thiab kev siv graphite cov peev txheej, txhim kho kev tshawb fawb thiab kev loj hlob ntawm cov peev txheej hauv kev tsim kho tshiab. zoo nyob rau hauv cov teb tshiab, tsis tu ncua empowering txoj kev loj hlob ntawm tshiab tsim muaj zog.