Daim Ntawv Thov thiab Kev Tshawb Fawb Txog Qhov Zoo ntawm Graphitized Petroleum Coke hauv Kev Lag Luam Aluminium Electrolysis
I. Daim ntawv thov ntawm Graphitized Petroleum Coke hauv Cathode Blocks thiab Anode Paste
1. Kev Tsim Khoom Cathode Block
Cov roj av coke uas muaj graphitized yog cov khoom siv tseem ceeb rau kev tsim cov cathode carbon blocks. Tom qab kev kho graphitization kub siab ntawm kwv yees li 3000 ° C, nws cov pa roj carbon purity tshaj 98%, thiab qhov ceev tiag tiag nce ntxiv ntau heev, tsim cov qauv siv lead ua graphite uas tau txiav txim siab zoo. Cov qauv no muab cov cathode blocks nrog cov yam ntxwv hauv qab no:
- Kev tiv thaiv kev yaig sodium zoo dua: Cov qauv graphitized uas muaj cov khoom ntshiab siab zoo tiv taus kev nkag mus ntawm sodium thaum lub sijhawm electrolysis txhuas, ua rau lub neej cathode ntev dua.
- Kev ua hluav taws xob zoo dua: Graphitization txo qhov resistivity ntau heev, txo qhov poob qis ntawm lub cell hauv qab thiab txo cov kev siv hluav taws xob ntawm txhuas los ntawm kwv yees li 5% -10%.
- Kev ruaj khov thermal zoo tshaj plaws: Kev nthuav dav tsawg ntawm qhov kub siab txo qis kev pheej hmoo ntawm kev tawg los ntawm kev ntxhov siab thermal.
2. Kev Npaj Anode Paste
Hauv cov tshuaj nplaum anode, graphitized roj av coke feem ntau ua haujlwm ua cov khoom siv carbon thiab cov khoom siv conductive, nrog rau cov teebmeem hauv qab no:
- Kev ua hluav taws xob zoo dua: Cov qauv graphitized txhawb kev faib tawm tam sim no, txo cov anode overvoltage.
- Txhim kho kev tiv thaiv oxidation: Cov ntsiab lus sulfur tsawg (feem ntau <0.06%) txo qis qhov tawg ntawm cov roj thaum lub sijhawm tshuaj tiv thaiv nrog CO₂, txo cov kev siv anode ib tuj ntawm cov hlau (piv txwv li, txo 12% hauv kev siv tshwj xeeb ntawm ib lub tuam txhab).
- Cov qauv pore zoo tshaj plaws: Graphitization txo qhov porosity ntawm pitch coke, ua rau anode ceev thiab lub zog kho tshuab nce ntxiv.
II. Cov txiaj ntsig tseem ceeb ntawm Graphitized Petroleum Coke dua li Calcined Petroleum Coke
| Kev Ntsuas Kev Ua Tau Zoo | Cov roj av graphitized Coke | Calcined Petroleum Coke |
|---|---|---|
| Cov ntsiab lus ntawm sulfur | 0.03%–0.06% (hom uas muaj sulfur tsawg) | ~ 0.5% (hom txheem) |
| Tus nqi nqus | 90%–95% | 80%–90% |
| Qib kawm txog kev ua duab | Muaj cov duab graphite ntau heev (qhov ceev tiag tiag ≥2.18 g/cm³) | Muaj ib feem graphitized (qhov ceev tiag tiag 1.8–2.0 g/cm³) |
| Cov ntsiab lus tsis huv | Tshauv ≤0.15%, cov khoom tsis ruaj khov <0.5% | Tshauv 0.3%–0.8%, cov khoom tsis haum 0.7%–1.5% |
| Cov coefficient ntawm kev nthuav dav thermal | Qis (hom koob coke) | Siab (hom tshuaj txhuam coke) |
| Cov xwm txheej ntawm daim ntawv thov | Cov electrodes graphite muaj zog heev, cov khoom siv carbon tshwj xeeb | Cov anodes ua ntej ci, cov electrodes silicon hauv kev lag luam |
Cov Kev Zoo Tshwj Xeeb:
1. Kev Ua Haujlwm Zoo Tshaj Plaws ntawm Electrochemical
- Qhov resistivity ntawm graphitized roj av coke yog 30% -50% qis dua li ntawm calcined coke, txo qhov kev siv hluav taws xob ntawm electrolysis cell. Piv txwv li, hauv 750 hli koob coke electrodes, conductivity ntau dua li ntawm tus qauv coke los ntawm peb npaug, txhim kho kev ua haujlwm steelmaking mus rau 25 feeb ib lub cub tawg.
- Cov tshuaj sulfur tsawg txo cov kev sib xyaw ntawm cov anodes thiab cov electrolytes uas muaj fluoride, txo qhov o ntawm cov roj thiab ua rau lub neej ntawm anode ntev dua.
2. Kev Txhim Kho Khoom Siv Kho Tshuab
- Kev ua graphitization ua rau cov khoom siv tawv thiab tiv taus kev poob siab thermal. Hauv cov chaw electrolysis aluminium kub siab, qhov coefficient thermal expansion ntawm cov cathode blocks graphitized yog 30% qis dua li ntawm calcined coke, txo cov kev puas tsuaj ntawm cov qauv los ntawm kev hloov pauv kub.
- Qhov ceev tiag tiag siab dua (≥2.18 g/cm³) ua rau cov khoom me dua, txo qhov nkag mus ntawm cov kua txhuas thiab kev puas tsuaj ntawm sodium.
3. Cov txiaj ntsig ntawm ib puag ncig thiab kev lag luam
- Cov tshuaj sulfur txo qis cov pa phem SO₂, ua raws li cov cai ib puag ncig. Piv txwv li, lub Hoobkas ua txhuas siv cov coke graphitized uas muaj cov tshuaj sulfur tsawg tau txo cov pa phem SO₂ rau ib tuj ntawm txhuas los ntawm 15%.
- Txawm hais tias tus nqi siab dua (kwv yees li 1.5–2 npaug ntawm cov coke calcined), lub neej ntev dua thiab kev siv hluav taws xob tsawg dua pab them rau kev nqis peev thawj zaug. Piv txwv li, lub neej ntawm cathode block tau nce ntxiv los ntawm 5 mus rau 8 xyoo, txo cov nqi tag nrho los ntawm 20%.
III. Cov Ntaub Ntawv Thov thiab Kev Txhawb Nqa Cov Ntaub Ntawv
- Kev Lag Luam Electrolysis Aluminium: Thoob ntiaj teb, 70% ntawm cov calcined coke yog siv rau cov anodes electrolysis aluminium, tab sis cov lag luam siab (piv txwv li, graphitized cathodes) tab tom siv graphitized coke ntau zuj zus. Ib lub tuam txhab tau txo qis kev siv anode los ntawm 420 kg / t-Al mus rau 370 kg / t-Al tom qab siv graphitized cathodes, txuag RMB 200 lab txhua xyoo.
- Kev Lag Luam Hlau: Cov electrodes coke koob 750 mm uas nqa cov hluav taws xob 100,000 A ua tiav kev ua hlau zoo ntawm 25 feeb rau ib lub cub tawg, nrog rau kev coj hluav taws xob siab dua peb zaug dua li cov coke txheem.
- Kev Khaws Cia Zog: Asphalt-modified calcined coke tau txhim kho lub neej voj voog ntawm cov pa roj carbon anode los ntawm 400 lub voj voog, tau txais kev rub tawm hauv kev lag luam roj teeb sodium-ion.
IV. Xaus Lus
Cov roj av coke uas muaj graphitized, los ntawm kev ua graphitization kub siab, qhia tau tias nws muaj kev ntshiab zoo dua, kev ua hluav taws xob zoo dua, thiab kev ruaj khov thermal piv rau cov roj av coke calcined, ua rau nws zoo tagnrho rau cov khoom siv cathode electrolysis zoo tshaj plaws thiab cov khoom siv anode tshwj xeeb. Txawm hais tias nws cov nqi siab dua, nws lub neej ntev dua, kev siv hluav taws xob zoo, thiab cov txiaj ntsig ib puag ncig ua rau nws yog cov khoom siv tseem ceeb rau kev txhim kho kev lag luam txhuas. Kev nce qib yav tom ntej hauv kev siv tshuab graphitization (piv txwv li, kev kho mob kub heev ntawm 3000 ° C) yuav nthuav dav nws cov ntawv thov mus rau hauv graphite qib nuclear, lithium-ion roj teeb anodes, thiab lwm yam teb tshiab.
Lub sijhawm tshaj tawm: Cuaj hlis-22-2025