{"id":6620,"date":"2021-04-04T12:32:53","date_gmt":"2021-04-04T12:32:53","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6620"},"modified":"2021-04-12T06:48:56","modified_gmt":"2021-04-12T06:48:56","slug":"explication-detaillee-des-parametres-de-la-poudre-dalumine","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/fr\/explication-detaillee-des-parametres-de-la-poudre-dalumine\/","title":{"rendered":"Explication d\u00e9taill\u00e9e des param\u00e8tres de la poudre d'alumine"},"content":{"rendered":"

\u00c0 l'heure actuelle, les poudre d'alumine<\/a> produit par le proc\u00e9d\u00e9 Bayer repr\u00e9sente plus de 90% de la production totale, dont la plupart sont utilis\u00e9es pour fabriquer de l'aluminium m\u00e9tallique, et moins de 10% sont utilis\u00e9es \u00e0 d'autres fins.<\/p>\n

Poudre d'alumine<\/a> est l'alumine, symbole chimique : Al2O3, poids mol\u00e9culaire 102, l'alumine pure est une poudre amorphe blanche, commun\u00e9ment appel\u00e9e bauxite, densit\u00e9 3,9-4.0g\/cm3, point de fusion 2050\u2103, point d'\u00e9bullition 2980\u2103, insoluble dans l'eau, oxyde amphot\u00e8re, soluble dans l'acide inorganique et solution alcaline, il y a quatre allotropes \u03b2-alumine \u03b4-alumine v-alumine a-alumine, et il y a principalement deux variantes de type \u03b1 et \u03b3 type , Industriellement peut \u00eatre extrait de la bauxite.<\/p>\n

Dans le r\u00e9seau cristallin de l'alumine de type \u03b1, les ions oxyg\u00e8ne sont dens\u00e9ment r\u00e9partis dans les hexagones, et Al3+ est sym\u00e9triquement distribu\u00e9 dans le centre de coordination octa\u00e9drique entour\u00e9 d'ions oxyg\u00e8ne. L'\u00e9nergie du r\u00e9seau est importante, de sorte que le point de fusion et le point d'\u00e9bullition sont \u00e9lev\u00e9s. L'alumine de type \u03b1 est insoluble dans l'eau et dans l'acide. Elle est \u00e9galement appel\u00e9e oxyde d'aluminium dans l'industrie. C'est la mati\u00e8re premi\u00e8re de base pour la fabrication du m\u00e9tal aluminium. Elle est \u00e9galement utilis\u00e9e pour fabriquer diverses briques r\u00e9fractaires, des creusets r\u00e9fractaires, des tubes r\u00e9fractaires et des instruments de test \u00e0 haute temp\u00e9rature ; elle peut \u00e9galement \u00eatre utilis\u00e9e comme abrasif, retardateur de flamme, charge, etc. L'alumine de type \u03b1 de haute puret\u00e9 est \u00e9galement la mati\u00e8re premi\u00e8re pour la production de corindon artificiel, de rubis artificiel et de saphir artificiel ; elle est \u00e9galement utilis\u00e9e pour la production de circuits int\u00e9gr\u00e9s modernes \u00e0 grande \u00e9chelle.<\/p>\n

L'alumine de type \u03b3 est produite par d\u00e9shydratation de l'hydroxyde d'aluminium \u00e0 une temp\u00e9rature basse de 140-150\u00b0C. Elle est \u00e9galement appel\u00e9e alumine activ\u00e9e et colle d'aluminium dans l'industrie. Dans sa structure, les ions oxyg\u00e8ne sont \u00e0 peu pr\u00e8s dens\u00e9ment emball\u00e9s dans des plans verticaux, et Al3+ est irr\u00e9guli\u00e8rement distribu\u00e9 dans les vides octa\u00e9driques et t\u00e9tra\u00e9driques entour\u00e9s d'ions oxyg\u00e8ne. L'alumine de type \u03b3 est insoluble dans l'eau, mais peut \u00eatre dissoute dans un acide fort ou une solution alcaline forte. Lorsqu'elle est chauff\u00e9e \u00e0 1200\u2103, elle est compl\u00e8tement convertie en alumine de type \u03b1. L'alumine de type \u03b3 est un mat\u00e9riau poreux, dont la surface interne peut atteindre plusieurs centaines de m\u00e8tres carr\u00e9s par gramme, avec une activit\u00e9 \u00e9lev\u00e9e et une forte capacit\u00e9 d'adsorption. Les produits industriels sont souvent des particules cylindriques incolores ou l\u00e9g\u00e8rement roses pr\u00e9sentant une bonne r\u00e9sistance \u00e0 la pression. Il est couramment utilis\u00e9 comme adsorbant, catalyseur et support de catalyseur dans le raffinage du p\u00e9trole et l'industrie p\u00e9trochimique ; il est utilis\u00e9 comme agent de d\u00e9sacidification pour l'huile de transformateur et l'huile de turbine dans l'industrie ; il est \u00e9galement utilis\u00e9 pour l'analyse chromatographique ; en laboratoire, c'est un d\u00e9shydratant neutre et puissant Sa capacit\u00e9 de s\u00e9chage n'est pas inf\u00e9rieure \u00e0 celle du pentoxyde de phosphore. Apr\u00e8s utilisation, il peut \u00eatre r\u00e9g\u00e9n\u00e9r\u00e9 et r\u00e9utilis\u00e9 apr\u00e8s avoir \u00e9t\u00e9 chauff\u00e9 \u00e0 175\u00b0C pendant 6 \u00e0 8 heures.<\/p>","protected":false},"excerpt":{"rendered":"

At present, the world’s alumina powder produced by Bayer process accounts for more than 90% of the total output, most of which are used to make metal aluminum, and less than 10% are used for other purposes. Alumina powder is alumina, chemical symbol: Al2O3, molecular weight 102, pure alumina is white amorphous powder, commonly known 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