Kev cuam tshuam ntawm Impurity Cov ntsiab lus ntawm Brown Fused Alumina Ntawm Nws Zoo

Hom thiab ntau npaum li cas ntawm impurities muaj qhov sib txawv rauxim av fused aluminacrystals, saib cov lus hauv qab no:

1. Kev Siv Silica muaj Calcium Bauxite

Calcium oxide tam sim no nyob rau hauv bauxite tsis yog txo los ntawm carbon thiab yuav luag tag nrho nkag mus rau hauv yaj. Yog hais tias tsuas muaj calcium oxide thiab alumina nyob rau hauv yaj, ces cov impurity calcium oxide yuav tag nrho crystallize li calcium hexaaluminate thaum lub sij hawm txias, thiab txhua calcium oxide molecule yuav noj 6 alumina molecules, uas yog, txhua pawg ntawm calcium oxide yuav noj. 10.91 qhov chaw los ntawm huab hwm coj ntawm alumina tsim 11.91 qhov chaw los ntawm huab hwm coj ntawm calcium hexaaluminate. Yog hais tias muaj qee yam ntawm silica impurities nyob rau hauv lub yaj tib lub sij hawm, cov crystals tej zaum yuav precipitated li calcium plagioclase, thiab txhua calcium oxide molecule tsuas noj 1 molecule ntawm alumina, uas yog, txhua pawg ntawm calcium oxide noj xwb 1.818 qhov chaw. los ntawm huab hwm coj alumina, tsim 4.96 qhov chaw ntawm calcium plagioclase.

2. Kev siv ntawm silicon oxide nyob rau hauv magnesium-muaj

Magnesium oxide nyob rau hauv yaj muaj kev txwv nruj rau crystallization ntawm xim av aluminium oxide. Hauv thaj tsam crystallization ntawm xim av fused alumina, txoj kev crystallization ntawm xim av aluminium oxide shortens nrog qhov nce ntawm MgO cov ntsiab lus. Yog tias MgO cov ntsiab lus ntau dua 3 feem pua, thawj qhov chaw crystallization tsis yog xim av fused alumina tab sis magnesium aluminium spinel. Thaum muaj qee qhov nyiaj ntawm silicon dioxide hauv cov yaj, thawj thaj tsam crystallization tuaj yeem rov qab mus rau thaj tsam xim av aluminium oxide crystallization, lossis cov crystallization ntawm cov xim av fused alumina tuaj yeem nce ntxiv, thiab ntau alumina tuaj yeem ua rau hauv cov xim av xim av. oxide theem.

3. Silica thiab Sodium Oxide

Nyob rau hauv smelting ntawm dawb fused alumina, sodium oxide nyob rau hauv alumina hmoov yuav tsim sodium peraluminate (Na₂O·11 Al₂O₃) nrog alumina tom qab melting, thiab txhua molecule ntawm sodium oxide yuav noj 11 molecules ntawm alumina, uas yog, txhua qhov loj ntawm sodium oxide siv 18.10 loj qhov chaw ntawm alumina thiab tsim 19.10 pawg ntawm sodium peraluminate. Yog hais tias ib qho nyiaj ntawm silicon oxide ntxiv rau cov yaj kom crystallize sodium oxide li Sanclineline (Na₂O·Al₂O₃· 2 TSI₂), txhua lub molecule ntawm sodium oxide tsuas yog siv 1 molecule ntawm alumina, uas yog, txhua pawg Sodium oxide tsuas yog siv 1.645 feem ntawm alumina los ntawm qhov zoo, thiab tsim 4.584 qhov chaw ntawm sanclinite.