Cov khoom siv raw

Kev siv cov khoom siv ntau tshaj plaws pab txo qis CO2 emissions

Hlau Recycling Scarp

Niaj hnub no, nws tau kwv yees tias kev lag luam hlau thoob ntiaj teb siv li 2 billion tonnes ntawm hlau ore, 1 billion tonnes ntawm metallurgical thee thiab 575 lab tonnes ntawm steel seem los tsim txog 1.7 billion tonnes ntawm cov hlau tsis huv.

Recycled steel (tseem hu ua scrap steel) yog ib qho ntawm cov khoom siv tseem ceeb tshaj plaws hauv kev lag luam. Nws los ntawm kev rhuav tshem cov qauv thiab qhov kawg ntawm lub neej tsheb thiab cov tshuab thiab los ntawm kev poob tawm hauv cov txheej txheem steelmaking.

Txhua cov nroj tsuag steel kuj yog cov khoom siv rov ua dua tshiab, thiab tag nrho cov khoom siv hlau siv cov khoom seem, txog li 100 feem pua ​​​​ntawm cov hluav taws xob arc rauv (EAF) thiab txog li 30 feem pua ​​​​hauv qhov cub tawg (BF).

Tag nrho cov seem uas tau sau yog rov siv dua, thiab tag nrho cov khoom siv rov ua dua hnub no yog kwv yees li 85 feem pua. Cov qib siab ntawm kev rov ua dua tshiab no txhais tau hais tias tsis muaj chaw rau kev txhim kho.

Cov khib nyiab ua lub luag haujlwm tseem ceeb hauv kev txo qis kev lag luam emissions thiab kev siv peev txheej. Txhua tonnes ntawm seem siv rau steel ntau lawm zam lub emission ntawm 1.5 tonnes ntawm carbon dioxide, thiab noj 1.4 tonnes ntawm hlau ore, 740 kg ntawm thee thiab 120 kg ntawm limestone.

Kev nthuav dav yav tom ntej ntawm cov khoom seem steel yuav nyob ntawm qhov muaj cov khoom siv qib siab.

Thaum cov khoom siv hlau hlau tuaj yeem hloov kho nrog kev xav tau, cov khoom seem thoob ntiaj teb yog qhov ua haujlwm ntawm kev thov steel thiab qhov tshwm sim ntawm seem ntawm lub neej kawg ntawm cov khoom siv hlau.

Ntiaj teb no steelmaking muaj peev xwm tau ntsib ib theem ntawm kev loj hlob tawg los ntawm thaum ntxov 2000s loj hlob los ntawm kev nqis peev hauv lub peev xwm tshiab hauv Suav teb.

Nrog rau cov khoom siv hlau uas muaj qhov nruab nrab ntawm 40 xyoo, cov hlau no yuav pib nkag mus rau hauv cov khoom seem hauv lub xyoo caum tom ntej, ua rau muaj kev txo qis ntawm kev lag luam steel emissions.

Hlau ore thiab metallurgical thee yog siv tsuas yog nyob rau hauv cov txheej txheem blast furnace ntawm ironmaking. Rau cov txheej txheem no, coking thee tau hloov mus rau hauv coke, yuav luag daim ntawv ntshiab ntawm carbon, uas yog siv los ua cov roj tseem ceeb thiab txo qis hauv qhov cub tawg.

Feem ntau, nws yuav siv li 1.6 tonnes ntawm hlau ore thiab ib ncig ntawm 450 kg ntawm coke los tsim ib tonne ntawm npua hlau, cov hlau nyoos uas tawm ntawm lub cub tawg. Qee cov coke tuaj yeem hloov tau los ntawm kev txhaj tshuaj pulverized thee rau hauv qhov cub tawg.

Hlau yog ib qho ntxhia hauv ntiaj teb. Feem ntau cov hlau ore raug rho tawm hauv cov mines opencast hauv Australia thiab Brazil, nqa mus rau cov chaw nres nkoj ntawm kev tsheb ciav hlau, thiab tom qab ntawd xa mus rau cov nroj tsuag steel hauv Asia thiab Europe.

Raws li United Nation's COMTRADE Statistics Database, thoob ntiaj teb kev xa tawm ntawm cov hlau ore hauv 2017 muaj kwv yees li ntawm 1.5 billion tonnes, sawv cev rau qhov thib ob loj tshaj plaws cov khoom lag luam ntim thoob ntiaj teb, tom qab lub ntiaj teb cov roj av xa tawm.

Kev siv cov peev txheej ntuj tau zoo yog qhov tseem ceeb rau kev ruaj khov

Kev lag luam steel siv cov thev naus laus zis thiab cov txheej txheem los ua kom cov nqi tsim khoom, txo nws cov kev xav tau ntawm lub zog, thiab pab txhawb kev siv cov khoom sib koom ua ke.

Qhov nruab nrab, 20 GJ ntawm lub zog yog siv rau ib tonne ntawm crude steel tsim thoob ntiaj teb. Cov tuam txhab hlau ua tau zoo tshaj plaws tau txo lawv lub zog siv ib tonne ntawm cov hlau los ntawm ib ncig ntawm 60 feem pua ​​txij li xyoo 1960.

Yog xav paub ntxiv txog steel kev lag luam raw cov ntaub ntawv, mus saib peb cov ntaub ntawv tseeb muaj nyob rau download mus rau sab xis ntawm cov ntawv no.