Cryolite ua haujlwm li cas hauv electrolytic aluminium?

Nyob rau hauv cov txheej txheem aluminium smelting, cryolite yog siv los ua cov khoom tseem ceeb rau txhuas smelting vim:

1. Ntshiab cryolite tsis muaj cov hlau impurities uas muaj peev xwm los nag ntau dua aluminium, thiab cov ntshiab txhuas tuaj yeem tau txais yog tias tsis muaj impurities ntxiv los ntawm sab nraud thaum lub sijhawm ua haujlwm.

2 cryolite tuaj yeem yaj alumina zoo, thaum qhov kub ntawm electrolytic yog 950 degree -970 degree, solubility ntawm alumina hauv cryolite yog li 10%.

3. Ntawm qhov kub ntawm electrolytic, qhov ceev ntawm cryolite-alumina tov yog qis dua li ntawm molten aluminium ntawm tib qhov kub, uas tuaj yeem ntab ntawm molten aluminium los tiv thaiv aluminium oxidation, thiab cov electrolyte thiab aluminium tuaj yeem sib cais zoo dua.

4. Cryolite muaj qee yam conductivity, yog li lub siab poob ntawm cov electrolyte txheej tsis siab dhau.

5. Cryolite yaj muaj qee yam fluidity ntawm qhov ntsuas kub ntawm electrolytic, thiab cov roj anode tuaj yeem tawm ntawm cov electrolyte, uas yog qhov tsim nyog rau cyclization ntawm electrolyte.

6. Nyob rau hauv lub xeev molten, cryolite yog ib qho yooj yim uas tsis yog-absorbent thiab tsis-volatile, txo cov khoom noj thiab ua kom ruaj ntseg ntawm cov electrolyte.

Cryolite, tseem hu ua sodium hexafluoroaluminate los yog sodium txhuas fluoride, cov mis mos molecular yog Na3AlF6, yog ib qho me me dawb siv lead ua, tsis muaj ntxhiab, soluble ntau dua li ntuj cryolite. Loj dua, hardness 2 ~ 3, melting point yog ib qho yooj yim nqus dej thiab noo noo, crystolite yog tsuas yog siv raws li txhuas electrolytic flux, roj hmab thiab sib tsoo log hnav muab tub lim, enamel muab tshuaj txhuam, iav sunscreen thiab hlau flux, qoob loo tshuaj tua kab, nyob rau hauv ib txwm muaj xwm txheej, nws tsis decompose, tsis-volatile los yog tsis-delixing, nws melting point yog siab tshaj txhuas, nws conductivity yog zoo, thiab nws txuag zog. Nws tuaj yeem hais tau tias tsis muaj cryolite, lub ntiaj teb yuav tsis muaj xws li kev lag luam aluminium loj.