### Cov Txheej Txheem Ua Hlau Los Ntawm Cov Hlau Ore
Hlau yog ib qho ntawm cov ntaub ntawv siv tau ntau yam thiab siv dav tshaj plaws hauv ntiaj teb, nrog rau kev siv ntau yam los ntawm kev tsim kho thiab kev tsim tsheb mus rau cov khoom siv hauv tsev thiab cov khoom siv hluav taws xob. Txoj kev taug kev los ntawm cov hlau tsis tau ua tiav mus rau cov hlau tiav yog ib qho txheej txheem nyuaj thiab txaus nyiam uas cuam tshuam nrog ntau theem tseem ceeb thiab thev naus laus zis zoo heev. Tsab xov xwm no yuav coj koj mus rau hauv cov txheej txheem ib kauj ruam zuj zus ntawm kev hloov cov hlau mus ua hlau.
#### 1. Kev khawb av thiab kev thauj mus los
Cov txheej txheem ua hlau pib nrog kev rho tawm cov hlau ore, uas yog cov khoom muaj ntau nyob hauv lub ntiaj teb lub plhaub. Hlau ore raug khawb los ntawm cov qhov av qhib lossis cov qhov av hauv av, nyob ntawm qhov chaw thiab qhov tob ntawm cov deposits. Cov cheeb tsam khawb hlau ore loj suav nrog Australia, Brazil, Canada, thiab Tuam Tshoj. Cov hlau nyoos ces raug thauj mus rau qhov chaw ua haujlwm qhov twg nws raug ntxuav, tsoo, thiab tshuaj ntsuam kom cais cov hlau muaj nqis ntawm cov khoom pov tseg.
#### 2. Kev Sib Sau Ua Ke thiab Kev Ua Pelletizing
Tom qab theem pib ntawm kev khawb av, cov hlau ore raug nplua los ntawm cov txheej txheem hu ua beneficiation, uas cuam tshuam nrog kev sib tsoo cov hlau ua hmoov zoo thiab siv kev sib cais sib nqus lossis kev ntab kom nce cov hlau. Cov hlau nplua no tom qab ntawd raug tsim ua cov pellets me me, ib daim ntawv zoo rau kev xa khoom thiab kev sib xyaw.
#### 3. Kev sib xyaw ua ke hauv lub cub tawg
Cov kauj ruam tom ntej yog hloov cov hlau ore pellets mus ua hlau molten, ib qho txheej txheem uas tshwm sim hauv lub cub tawg. Nov yog cov kauj ruam koom nrog:
- Them lub cub tawg: Lub cub tawg yog them nrog cov khoom sib xyaw ntawm cov hlau ore pellets, coke (ib hom carbon uas tau los ntawm thee), thiab limestone.
– Kev Kub Hnyiab: Cua kub (ntawm 900-1300°C) raug tshuab mus rau hauv lub cub tawg los ntawm cov nozzles hu ua tuyeres. Cov coke kub hnyiab thiab tsim cov cua sov heev (txog li 2000°C), ua rau muaj kev tshuaj lom neeg uas txo cov hlau ore rau hauv cov hlau yaj.
- Kev Txo: Cov kev teb tseem ceeb suav nrog:
\[
\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2
\]
\[
\text{C} + \text{O}_2 \rightarrow \text{CO}_2
\]
\[
\text{CO}_2 + \text{C} \rightarrow 2\text{CO}
\]
Cov tshuaj tiv thaiv no tsim cov hlau npua uas muaj li ntawm 4-5% carbon, nrog rau ntau yam tsis huv.
#### 4. Kev Ua Kom Zoo thiab Kev Hloov Pauv Hauv Lub Cub Hluav Taws Xob Pa oxygen Yooj Yim
Cov hlau npua uas yaj hauv lub cub tawg muaj cov pa roj carbon thiab lwm yam tsis huv, ua rau nws tawg yooj yim thiab tsis haum rau feem ntau ntawm cov ntawv thov. Kauj ruam tom ntej yog kev ua kom cov hlau npua no los tsim cov hlau hauv Lub Cub Pa oxygen Basic (BOF):
- Them BOF: Lub cub tawg raug them nrog cov hlau npua uas yaj, cov hlau seem, thiab qee zaum cov hlau txo qis ncaj qha (DRI).
– Tshuab Pa oxygen: Ib rab hmuv uas txias nrog dej yuav tshuab pa oxygen ntshiab ntawm qhov siab siab rau hauv cov hlau uas yaj. Qhov no ua rau muaj ntau yam kev hloov pauv exothermic uas cov pa oxygen cuam tshuam nrog cov pa roj carbon thiab cov khoom tsis huv los ua cov pa roj carbon dioxide thiab slag (cov khoom seem uas muaj cov khoom tsis huv).
- Kev Tsim Hlau: Cov tshuaj tiv thaiv suav nrog:
\[
\text{C} + \text{O}_2 \rightarrow \text{CO}_2
\]
\[
2\text{FeO} + \text{C} \rightarrow 2\text{Fe} + \text{CO}_2
\]
Thaum cov khoom tsis xav tau xws li sulfur, phosphorus, thiab silicon tsim cov oxides, lawv raug ntes hauv cov slag, thiab cov pa roj carbon raug txo kom txog qib uas haum rau hlau.
#### 5. Kev Ua Kom Zoo Dua Thib Ob
Tom qab thawj zaug hloov pauv hauv BOF, cov txheej txheem refining thib ob ntxiv purify cov hlau thiab kho nws cov tshuaj lom neeg kom ua tau raws li cov kev cai tshwj xeeb. Cov txheej txheem suav nrog:
– Ladle Metallurgy: Cov khoom sib xyaw ntxiv raug ntxiv rau hauv lub cub tawg ladle kom kho cov tshuaj lom neeg kom zoo.
– Kev Siv Lub Tshuab Nqus Pa: Cov hlau uas yaj lawm raug siv lub tshuab nqus pa kom tshem tawm cov pa roj uas yaj lawm xws li hydrogen thiab nitrogen.
– Electroslag Remelting (ESR): Cov hlau raug rov yaj dua kom tshem tawm cov khoom tsis sib xyaw thiab ua kom cov qauv nplej zoo dua.
#### 6. Kev Casting thiab Kev Kho Kom Ruaj Khoov
Thaum cov tshuaj lom neeg xav tau tiav lawm, cov hlau molten raug pov rau hauv cov khoom khov kho los ntawm ib qho ntawm ntau txoj kev:
– Kev Txhaj Txhuam Tsis Tu Ncua: Cov hlau uas yaj lawm raug nchuav rau hauv lub pwm uas txias nrog dej thiab rho tawm tas li, tsim ib txoj hlua khov uas tuaj yeem txiav ua tej daim, tej daim me me, lossis tej paj.
– Ingot Casting: Cov hlau uas yaj lawm raug nchuav rau hauv cov pwm loj kom ua cov ingots, uas tom qab ntawd rov ua kom sov thiab dov rau hauv cov duab zoo.
#### 7. Kev dov kub thiab kev dov txias
Cov hlau khov kho tau dhau los ntawm ntau txoj kev dov kom ua tiav cov duab thiab cov yam ntxwv tshwj xeeb:
– Kev Dov Kub: Cov hlau raug cua sov kom kub heev thiab dhau los ntawm ntau lub rollers kom txo qhov tuab thiab ua kom nws sib npaug zoo dua. Cov hlau kub dov yog siv rau cov nqaj hlau tsim kho, txoj kev tsheb ciav hlau, thiab cov hlau ntawv.
– Kev Dov Txias: Cov hlau dov kub raug ua tiav ntxiv ntawm qhov kub thiab txias hauv chav tsev kom txhim kho nws lub zog thiab qhov chaw tiav. Cov hlau dov txias yog siv rau hauv cov vaj huam sib luag tsheb, cov khoom siv hluav taws xob, thiab lwm yam kev siv precision.
#### 8. Cov Txheej Txheem Ua tiav
Cov theem kawg muaj ntau yam txheej txheem tiav los txhim kho cov khoom thiab tsos ntawm cov hlau:
- Kev Kho Mob Kub: Cov txheej txheem xws li annealing, quenching, thiab tempering txhim kho cov khoom siv kho tshuab ntawm cov hlau.
- Txheej Txheem Nto: Cov khoom siv hlau feem ntau yog coated nrog cov ntaub ntawv xws li zinc (galvanizing) los tiv thaiv kev xeb.
– Kev Siv Tshuab thiab Kev Tsim: Kev txiav, kev khawb, thiab kev ua duab ntxiv raug ua los tsim cov khoom kawg uas tsim rau cov kev siv tshwj xeeb.
#### Xaus lus
Kev hloov pauv ntawm cov hlau ore mus ua hlau yog ib txoj kev taug kev zoo heev uas tau hloov zuj zus ntau pua xyoo, txuas ntxiv txhim kho hauv kev ua haujlwm zoo thiab zoo. Kev tsim hlau niaj hnub no sib xyaw cov thev naus laus zis siab heev nrog cov txheej txheem tshuaj lom neeg nyuaj, ua rau muaj peev xwm tsim cov khoom siv tau ntau yam thiab tsis tuaj yeem hloov pauv tau. Txij li thaum rho cov hlau ore nyoos mus rau cov khoom tiav lawm, txhua kauj ruam ntawm txoj kev yog qhov tseem ceeb rau kev tsim cov hlau zoo uas txhawb nqa ntau yam kev lag luam thiab kev tsim kho tshiab thoob ntiaj teb.
