Taw qhia rau cov Alumina

Alumina, feem ntau yog hu ua bauxite, muaj tshuaj lom neeg al₂o₃. Nws yog cov hmoov dawb nrog lub ntom ntawm 3.9-4.0 g / cm₃, lub ntsiab lus melting ntawm 2050 degree, thiab lub qhov cub npau npau ntawm 2980 degree. Nws yog insoluble hauv dej tab sis maj mam yaj nyob rau hauv concentrated sulfuric acid. Nws tuaj yeem raug siv los ua kom ua kom tshuab cov hlau txhuas thiab tseem yog cov khoom siv raw rau cov crucibles, plooj (venal), recractories, thiab mancessial gemstones. Alumina siv ua adsorbent, catalyst, thiab catalyst cov cab kuj yog hu ua "alumina." Nws cov porosity, siab dispersion, thiab thaj chaw loj tshwj xeeb ua rau nws dav siv nyob rau hauv Petrochemical, Tshuaj lom neeg zoo, thiab tshuaj biotechnology, thiab tshuaj biotepectical.
Ua kom Alumina feem ntau yog tsim los ntawm cua sov thiab lub cev qhuav dej txhuas hydroxide. Aluminium hydroxide, tseem muaj lub npe hu ua hydrated aluminium oxide, muaj cov tshuaj lom neeg muaj pes tsawg leeg, muaj feem ntau cais raws li alumina trihydrate raws li cov dej ntawm crystallization nws muaj. Cua sov thiab lub cev qhuav dej txhuas hydroxide ua rau - al₂o₃, feem ntau paub li ua alumina.