1. Kev siv silicon oxide hauv calcium alumina
Calcium oxide nyob rau hauv alumina yog qhov nyuaj kom txo tau los ntawm carbon, thiab yuav luag tag nrho nws nkag mus rau hauv yaj. Yog hais tias tsuas muaj calcium oxide thiab txhuas oxide nyob rau hauv lub yaj, lub impurity calcium oxide yuav tag nrho crystallized li calcium hexaaluminate thaum lub sij hawm txias txheej txheem. Txhua calcium oxide molecule siv 6 txhuas oxide molecules, uas yog, txhua pawg ntawm calcium oxide siv 10.91 feem ntawm txhuas oxide, thiab 11.91 feem ntawm calcium hexaaluminate yog generated. Yog tias qee qhov nyiaj ntawm silicon dioxide impurities tseem muaj nyob rau hauv cov yaj, cov crystals yuav raug precipitated li calcium plagioclase, thiab txhua calcium oxide molecule siv tsuas yog 1 molecule ntawm txhuas oxide, uas yog, txhua pawg ntawm calcium oxide siv tsuas yog 1.818 feem ntawm aluminium oxide, thiab 4.96 qhov chaw ntawm calcium plagioclase yog tsim.
2. Kev siv silicon oxide hauv magnesium alumina
Magnesium oxide nyob rau hauv yaj muaj ib tug nruj limiting nyhuv ntawm crystallization ntawmxim av aluminium oxide. Hauv thaj tsam crystallization ntawm xim av aluminium oxide, txoj kev crystallization ntawm xim av aluminium oxide shortens nrog qhov nce ntawm magnesium oxide cov ntsiab lus. Yog tias MgO cov ntsiab lus ntau dua 3%, thawj qhov chaw crystallization tsis yog lawmxim av fused aluminatab sis magnesium-aluminium spinel. Thaum muaj qee qhov nyiaj ntawm silicon dioxide nyob rau hauv lub yaj tib lub sij hawm, thawj crystallization cheeb tsam yuav rov qab mus rau xim av aluminium oxide crystallization cheeb tsam, los yog crystallization txoj kev ntawm xim av aluminium oxide tuaj yeem nce ntxiv, kom ntau aluminium oxide tuaj yeem ua rau nag lossis daus. nyob rau hauv lub xim av fused alumina theem.
3. Silicon oxide thiab sodium oxide
Nyob rau hauv smelting ntawm dawb corundum, sodium oxide nyob rau hauv alumina hmoov yuav tsim sodium aluminate (Na2O·11Al2O3) nrog txhuas oxide tom qab melting. Txhua molecule ntawm sodium oxide siv 11 molecules ntawm txhuas oxide, uas yog, txhua pawg ntawm sodium oxide siv 18.10 feem ntawm txhuas oxide thiab tsim 19.10 qhov chaw ntawm sodium aluminate. Yog hais tias ib tug npaum li cas ntawm silicon oxide ntxiv rau yaj kom sodium oxide crystallized li triclinic pyroxene (Na2O·Al2O3·2SiO2), txhua molecule ntawm sodium oxide tsuas siv ib molecule ntawm txhuas oxide, uas yog, txhua pawg ntawm sodium oxide. tsuas yog siv 1.645 feem ntawm txhuas oxide los tsim 4.584 qhov chaw ntawm triclinic pyroxene.
