Aluminium yog cov khoom siv dav tshaj plaws uas tsis yog{0}}ferrous hlau. Nws yog lub teeb, corrosion resistant, high conductive thiab infinitely recyclable. Tsis muaj ib qho ntawm cov khoom no tuaj yeem dawb: cov hlau taug kev los ntawm bauxite ore mus rau cov coil tiav muaj qee lub zog tshaj plaws - siv tshuaj lom neeg hauv kev lag luam. Cov kab lus no taug kev los ntawm txhua theem - mining, refining, smelting thiab dov - nrog cov txheej txheem tsis raug, thiab kaw nrog cov qauv zoo cov neeg yuav khoom yuav tsum tau kuaj ua ntej muab xaj.
Ntsiab Cai
- Aluminium ntau lawm sau los ntawm plaub theem: bauxite mining, alumina refining (Bayer txheej txheem), thawj smelting (Hall-Héroult electrolysis) thiab downstream dov thiab tsim.
- Electrolysis yog lub zog tsis muaj zog: kwv yees li 13,000-15,000 kWh ib tonne ntawm txhuas (kev lag luam ntau), thiab hluav taws xob feem ntau sawv cev rau 30-40% ntawm cov nqi tsim khoom (kev lag luam kwv yees).
- Tuam Tshoj tsim tawm kwv yees li 57% ntawm lub ntiaj teb thawj cov khoom siv txhuas hauv xyoo 2022 (kev lag luam kwv yees); kev thov yog coj los ntawm kev tsim kho, thauj thiab hluav taws xob.
- Recycled (secondary) txhuas siv li 5% ntawm lub zog ntawm thawj cov khoom lag luam (kev kwv yees kev lag luam), uas yog vim li cas cov khoom seem tau nce kev lag luam.
- Cov neeg yuav khoom yuav tsum txheeb xyuas cov alloy thiab temper, ntsuas qhov siab, qhov chaw thiab cov qauv siv tau - piv txwv li GB / T 1196 rau cov khoom siv, ASTM B209 rau daim ntawv thiab phaj, thiab GB / T 3198 rau ntawv ci.
1. Aluminium Value Chain
Cov saw hlau los ntawm ore mus rau cov khoom tiav khiav zoo li no:
Bauxite mining- qhib-qhov rho tawm ntawm cov txhuas-cov kabmob ore.
Alumina refining- txheej txheem Bayer hloov bauxite rau hauv alumina (aluminium oxide).
Primary aluminium smelting- Hall–Héroult electrolysis txo cov alumina rau kua txhuas hlau.
Casting thiab dov- hlau yog alloyed, cam khwb cia rau hauv ingots los yog slabs, ces dov los yog extruded rau hauv ntawv ci, coil, ntawv, pas nrig thiab profile.
Xaus kev siv thiab rov ua dua tshiab- ntim, tsheb, kev tsim kho thiab hluav taws xob; cov khoom seem rov qab mus rau lub voj raws li cov khoom siv aluminium.
Bauxite mining
Bauxite yog lub ntsiab ore ntawm txhuas. Nws feem ntau yog muab rho tawm los ntawm qhib- qhov mines, ces ntxuav thiab crushed ua ntej thauj. Qhov loj tshaj plaws deposits zaum nyob rau hauv Australia, Guinea, Nyab Laj thiab Tuam Tshoj. Nyob ntawm qib ore, kwv yees li 2-3 tonnes ntawm bauxite yog xav tau los tsim ib tonne ntawm alumina (tus piv piv).
Alumina refining - txheej txheem Bayer
Refining cais aluminium oxide los ntawm lwm cov ntxhia hauv bauxite. Nyob rau hauv cov txheej txheem Bayer, crushed ore yog zom nrog kub caustic soda (sodium hydroxide) ntawm qhov kub thiab txias thiab siab - roughly 150-250℃nyob ntawm seb ore qib (ntau npaum li cas). Cov txhuas yaj ua sodium aluminate, thaum hlau oxide thiab silica impurities nyob rau hauv lub residue hu ua av nkos liab, uas yuav tsum tau tswj nyob rau hauv lined cia chaw. Cov kev daws teeb meem yog ces precipitated li aluminium hydroxide thiab calcined ntawm qhov kub thiab txias kom tsav tawm dej, tawm hauv cov hmoov dawb alumina npaj rau smelting.
Thawj aluminium smelting - txheej txheem Hall–Héroult
Alumina raug txo kom txhuas hlau los ntawm electrolysis hauv Hall-Héroult cell. Lub alumina yog yaj nyob rau hauv molten cryolite ntawm roughly 950-970℃(ib txwm da dej kub), thiab ib tug ncaj tam sim no kis ntawm carbon anodes thiab lub cathode hauv ob sab phlu. Molten aluminium sau nyob rau hauv qab ntawm lub xov tooj ntawm tes thiab yog tapped raws sij hawm. Cell voltages feem ntau yog 4–5 V, thiab tam sim no efficiency ntawm zoo-khiav potlines feem ntau yog 90–95% (cov duab ib txwm).
Cov kauj ruam no qhia txog kev lag luam lub zog profile: tsim ib tonne ntawm txhuas feem ntau siv 13,000-15,000 kWh ntawm hluav taws xob (kev lag luam ntau yam). Vim li no, cov smelters nyob ze ntawm tus nqi qis - cov nqi hluav taws xob hluav taws xob tuav tus nqi tsim nyog kom zoo dua, thaum cov nroj tsuag tso siab rau cov thee- raws li daim phiaj muaj cov pa roj carbon ntau dua thiab raug ntau dua rau roj - nqi hloov pauv.
2. Txheej txheem Parameters
| Theem | Txoj kev tseem ceeb | Tej yam tsis zoo (kev lag luam- raug) |
|---|---|---|
| Bauxite mining | Qhib -qhov tshem tawm, ntxuav, crushing | ≈2–3 t bauxite ib tonne ntawm alumina, qib-nyob ntawm |
| Alumina refining | Cov txheej txheem Bayer: caustic digestion → nag lossis daus → calcination | Kev zom zaub mov ≈150-250 degree; calcination hauv chav kawm 1,000 degree |
| Electrolysis | Hall-Héroult, molten cryolite da dej, carbon anodes | Da dej ≈950-970 degree; cell 4-5 V; tam sim no efficiency 90-95%; hluav taws xob 13,000-15,000 kWh/t |
| Casting + dov | Alloying, DC casting, kub thiab txias dov | Cov ntawv ci dov mus rau kwv yees li 6-20 µm; coil/daim ntawv rau alloy-temper spec |
| Rov ua dua | Scrap sorting, remelting, alloying | Zog ≈5% ntawm txoj kev tseem ceeb (xws li kwv yees) |
Tag nrho cov duab saum toj no yog cov kev lag luam raug siv rau kev npaj thiab sib piv; lawv tsis guarantees rau tej yam nroj tsuag.
3. Zog, Nqi thiab Cov Lus Nug Carbon
Hluav taws xob yog tus nqi loj tshaj plaws hauv thawj txhuas, feem ntau kwv yees li ntawm 30-40% ntawm cov nqi tsim khoom (kev lag luam kwv yees). Ob qhov kev tshwm sim tom qab. Ua ntej, cov nqi hluav taws xob thiab hluav taws xob- qhov kev txiav txim siab txiav txim siab seb thaj chaw twg tuaj yeem tsim tau txiaj ntsig: thaj chaw uas muaj ntau lub zog siv hluav taws xob - piv txwv li Iceland, Norway lossis thaj chaw ntawm Canada - nyiam smelting muaj peev xwm meej vim pheej yig, ruaj khov, qis - hluav taws xob carbon. Qhov thib ob, cov hlau cov pa roj carbon hneev taw yog ib zaj dab neeg ntawm cov hluav taws xob ntau: feem ntau smelting emissions yog indirect, los ntawm lub hwj chim daim phiaj, nrog ntxiv ncaj qha CO₂ tso tawm raws li carbon anodes tau noj thaum lub sij hawm electrolysis.
Kev lag luam tau teb rau ntau qhov chaw. Inert (tsis yog-consumable) anode technology yog nyob rau theem sim: yog tias ua lag luam, nws yuav tshem tawm cov CO₂ ncaj qha tso tawm los ntawm cov pa roj carbon anodes thiab tuaj yeem txo qis kev xav tau ntawm tes. Fais fab- yuav daim ntawv cog lus rau hnub ci thiab cua, nrog rau cov ntawv pov thawj xws li Aluminium Stewardship Initiative (ASI), tau dhau los ua ntau txoj hauv kev rau cov neeg tsim khoom los sau cov ntawv qis dua - carbon hlau. Tsis muaj qhov no yog kev kho sai - daim phiaj decarbonization tseem yog qhov txiav txim siab.
4. Ntau lawm muaj peev xwm thiab kev ua lag luam qauv
Tuam Tshoj yog lub ntiaj teb loj tshaj plaws tsim ntawm thawj txhuas. Kev lag luam kwv yees muab nws cov khoom lag luam tawm thoob ntiaj teb kwv yees li 57% hauv 2022. Cov tsav tsheb yog cov qauv: ntev- txoj cai tswjfwm kev txhawb nqa rau kev lag luam, kev xav tau loj hauv tsev los ntawm kev tsim kho, thauj thiab hluav taws xob, thiab kev lag luam loj uas xa tawm ib nrab- cov khoom lag luam aluminium tiav.
Nyob rau tib lub sij hawm, lub sector yog consolidating. Lub peev xwm qab nthab, kev cai ib puag ncig thiab cov pa roj carbon- cov lus cog tseg tsis tu ncua tau thawb cov neeg tsim khoom kom so tawm me me, tsis muaj peev xwm potlines thiab nrhiav lub peev xwm tshiab nyob ze lub zog huv. Hauv lwm thaj chaw tsim khoom, kev loj hlob yog khi rau kev nkag mus rau hluav taws xob txuas ntxiv mus thiab mus rau ntev - daim ntawv cog lus alumina khoom. Qhov cuam tshuam rau cov neeg yuav khoom: cov khoom siv thoob ntiaj teb yog qhov txaus, tab sis tus nqi nkhaus yog ntxhab - thiab cov hlau pheej yig tshaj plaws tsis yog ib txwm huv.
5. Recycling thiab Sustainability
Recycling yog qhov chaw lag luam txhuas ua feem ntau ntawm nws ib puag ncig hnyav nqa. Melting seem kom ua rau cov aluminium theem nrab siv li ntawm 5% ntawm lub zog xav tau rau kev tsim khoom thawj zaug (kev lag luam kwv yees), thiab cov hlau siv rov ua tau zoo ib yam ntawm lub cev thaum alloying thiab melting tswj yog qhov tseeb - uas yog vim li cas txhuas tau piav raws li infinitely recyclable. Ntim ntawv ci, automotive castings thiab lub tsev profiles yog qhov loj tshaj plaws recycling kwj hnub no.
Tsim cov kev xaiv tseem ceeb: cov alloys uas yooj yim rau kev txheeb xyuas thiab tshem tawm, cov txheej txheem uas tsis muaj kab mob ntawm cov yaj, thiab cov kev coj ua dov uas ua kom cov txheej txheem seem qis tag nrho txhim kho kev ncig. Cov pa roj carbon-kev tshawb nrhiav thiab hydrogen- raws li cov ntsiab lus smelting tshwm nyob rau hauv cov ntaub ntawv kev txawj ntse, tab sis lawv cov kev lag luam nplai tseem txwv. Rau feem ntau cov neeg yuav khoom, lub zog ua kom ruaj khov tshaj plaws yog qhia txog kev rov ua dua tshiab -cov ntsiab lus lossis ASI- cov ntaub ntawv pov thawj uas daim ntawv thov tso cai.
6. Cov khoom zoo thiab cov qauv yuav tsum paub
Aluminium zoo yog txhais los ntawm kev muaj pes tsawg leeg, txheej txheem thiab kev tswj qhov ntev. Lub hauv paus ingots feem ntau muab tawm tsam Suav teb chaws tus qauv GB / T 1196, uas faib cov txhuas ingots los ntawm qib purity. Cov khoom dov - daim ntawv thiab phaj - tau dav dav rau ASTM B209, uas teev cov alloy muaj pes tsawg leeg, npau taws, txhua yam khoom thiab kam rau ua; cov ntawv ci muaj nyob hauv Suav teb los ntawm GB / T 3198. Ib tus neeg muag khoom daim ntawv pov thawj zeb xeem yuav tsum hais txog cov alloy, temper, gauge, width, deg class and the standard application.
Peb cov ntsiab lus tsim nyog tau txais kev saib xyuas hauv cov khoom siv dov: ntsuas qhov siab ntev (yuav ua li cas tuab tuab yog tuav - tseem ceeb rau cov ntawv ci thiab lamination), qhov chaw saum npoo (pinholes, roj stains, khawb), thiab cov hlau alloy-kev sib xyaw ua ke (piv txwv li 3003-H24 rau kev sib sau, lossis 5052 rau kev siv dej hiav txwv). Cov no tau txiav txim siab nyob rau theem dov - cov kauj ruam kawg ntawm cov saw hlau - uas yog vim li cas ua haujlwm nrog cov neeg tsim khoom uas tswj kev dov thiab ua tiav ncaj qha, raws li peb lub tuam txhab ua rau cov ntawv ci, coil thiab daim ntawv, txo cov kev pheej hmoo ntawm kev ua haujlwm.
Kev nkag siab ntawm cov saw tseem pab cov neeg yuav khoom nyeem cov lag luam: cov nqi hluav taws xob zoo ib yam -cov nqi hlau, cov khoom seem muaj cov khoom siv ntxiv, thiab lub hwj chim- qhov kev txiav txim siab nce ntxiv cov ntaub ntawv pov thawj ntawm cov hlau uas lawv yuav.
Cov lus nug nquag
Puas yog aluminium ntau lawm zog- hnyav?
Yog, feem ntau nyob rau theem smelting. Electrolysis feem ntau siv 13,000-15,000 kWh ntawm hluav taws xob ib tonne ntawm txhuas (kev lag luam ntau yam), thiab hluav taws xob feem ntau sawv cev rau 30-40% ntawm cov nqi tsim khoom (kev lag luam kwv yees). Kev rov ua dua tshiab yog qhov tsawg dua lub zog- tshaib plab - txog 5% ntawm txoj kev tseem ceeb (kev kwv yees ib txwm).
Dab tsi yog qhov txawv ntawm alumina refining thiab aluminium smelting?
Refining (tus txheej txheem Bayer) hloov bauxite ore rau hauv alumina hmoov siv caustic -soda chemistry. Smelting (tus txheej txheem Hall-Héroult) ces siv electrolysis los txo cov alumina rau hauv cov kua txhuas hlau. Lawv yog ob theem sib cais; ua rau lawv tsis meej pem yog ib qho yuam kev nyob rau hauv dav dav - cov neeg tuaj saib cov ntawv.
Vim li cas qhov chaw hluav taws xob tseem ceeb rau txhuas?
Vim smelting yog hluav taws xob-dominated. Cov neeg tsim khoom nyob ze cov nroj tsuag hydroelectric nyiam qis dua, cov nqi hluav taws xob ruaj khov dua thiab cov pa roj carbon tsawg dua; cov neeg tsim khoom ntawm cov thee- cov phiaj xwm hnyav them ntau dua nyob rau hauv ob qho tib si emissions thiab raug rau cov nqi roj.
Cov qauv twg npog aluminium ingots, ntawv thiab ntawv ci?
Hauv Suav teb, GB / T 1196 npog aluminium ingots thiab GB / T 3198 npog cov ntawv ci. ASTM B209 yog tus qauv ntsuas thoob ntiaj teb rau daim ntawv thiab phaj, txhais tau tias alloy, temper, khoom thiab kam rau ua. Nco ntsoov nug rau daim ntawv pov thawj zeb xeem tawm tsam tus qauv siv tau.
Puas yog cov khoom siv aluminium puas ua tau zoo ib yam li cov hlau thawj?
Rau ntau daim ntawv thov, yog. Secondary aluminium khaws tib lub cev lub cev thaum alloying thiab yaj tswj tau raug, uas yog vim li cas cov khoom seem -raws li cov khoom lag luam loj hlob hauv ntim thiab siv tsheb.
