1. Cov Pa Cov Khaub Ncaws Pa Roj Pa Cov Khoom Siv Hauv Txhuas Ntawv Caws Ntau Lawm
Key Emists hotspots:
Bauxite Mining: 1 {{.} 2-1.8 kg CO₂ / kg al ntawm av clearance thiab diesel-powered cov khoom siv.
Elololsissis: 8-12 kg CO₂ / kg al (thoob ntiaj teb) siv cov thee-powered smelters.
Rolling Mills: 0 {{.}}}}}}}}} 5 kg CO₂ / KG NTAWV NYIAJ LOS NTAWM NATURES CUA KUB.
Me quav: Hydro hloov dua tshiab-powered smelters kev txiav elecsisty emissions rau 4 kg al (2024 cov ntaub ntawv).
2. Yuav ua li cas Cov Ntawv Siv Dej Ntau Lawm?
Bauxite residue (av liab): 1-1 {{{. tons ntawm alkaline slurry ib tuj ntawm al, pheej hmoo hauv av muaj paug.
Dej txias: 15-20 m³ / Tuj Ntawv Nyiaj Siv Hauv Rolling Mills .
Cov kev daws teeb meem:
Qhuav stacking liab av nkos (txo kev pheej hmoo los ntawm 90%) .
Kaw cov tshuab voj voog (rov qab siv 95% dej txias) .
3. Qhov kev sib tw sib tw ua ke muaj nyob rau tom ntej
Tsis huv: Cov Khoom Noj Khoom Noj Tsis Txaus Siab Tshaj Ntawv Ua Kom Tau Zoo (Tsis lees txais 30% ntawm cov ntawv ci).
Alloy Sib xyaw: Sib xyaw alloys (e {{{0} g .} {2}.
Ua kom muaj tswv yim:
Laser sorting cais alloys nrog 98% tseeb (Tomra, 2025) .
Enzyme-based tu tshem tawm cov ovrosion .
4. Txoj cai tswj hwm cov qauv ntawv yog li cas cov khoom siv hluav taws xob?
ISO 14001: Ua raws li kev ntsuam xyuas lub neej (LCA) rau cov ntawv ci mills .
EU Bal ntxias: Kev txwv kom tau cov tshuaj pleev kom ntev rau 50 mg / nm thiab nawb}
Epr kev cai: 75% recycling tus nqi yuav tsum rau cov ntawv ntim ntim hauv lub teb chaws Yelemees .
Kev Kawm Txog: Kev npaj them nyiaj tshiab tau them $ 2m them nyiaj rau 2023 rau kev pleev tshuaj fluoride hauv Brazil hauv Brazil.
5. Cov lus cog tseg yog kev cog lus Greenher cog ntau lawm?
Inert anode smelting: Tshem tawm PFC emissions (Alcoa lub phiaj xwm Elysis, 2026 rollout) .
Lubricav tsis siv roj ntsha: Roj ntxhia roj hauv qhov txias txias (cargill cov soy-roj sim qhia 40% qis toxicity).
Ai-tsav lub zog ua kom zoo: Txo cov dov zeb zog siv los ntawm 25% (Siemens, 2024).
Yav tom ntej saib xyuas: Carbon-nruab nrab ntawv ci ntau lawm ua tau los ntawm hydrogen-powered smelters.
