flux de raffinage<\/a>\u00a0En absorbant les inclusions oxyd\u00e9es pr\u00e9sentes dans la masse fondue, il peut r\u00e9duire l'\u00e9nergie libre de surface du syst\u00e8me. Le flux poss\u00e8de donc la capacit\u00e9 d'adsorber automatiquement les inclusions d'oxydation, ce qui constitue ses propri\u00e9t\u00e9s d'affinage. Cette adsorption est la principale raison de l'\u00e9limination des scories par le flux.<\/p>\nDe toute \u00e9vidence, plus la tension interfaciale entre le fondant et les inclusions non m\u00e9talliques est faible, et plus la tension interfaciale entre le fondant et l'aluminium fondu ainsi que celle entre l'aluminium fondu et les inclusions non m\u00e9talliques sont \u00e9lev\u00e9es, meilleure est l'adsorption du fondant. Plus l'effet d'\u00e9limination des scories est important, plus l'effet de dissolution du flux sur les oxydes est d\u00e9termin\u00e9 par la nature du flux.<\/p>\n
En r\u00e8gle g\u00e9n\u00e9rale, lorsque la structure mol\u00e9culaire des fondants est similaire \u00e0 celle de certains oxydes ou \u00e0 leurs propri\u00e9t\u00e9s chimiques, une dissolution r\u00e9ciproque peut se produire \u00e0 une certaine temp\u00e9rature. Par exemple, l'Al\u2082O\u2083 et le Na\u2083AlF\u2086, ainsi que le MgO et le MgCl\u2082 qui contiennent le m\u00eame cation, pr\u00e9sentent une certaine solubilit\u00e9 mutuelle. Cependant, dans la plage de temp\u00e9ratures normale d'affinage de l'aluminium fondu, la quantit\u00e9 d'oxydes dissous dans le fondant est tr\u00e8s faible.<\/p>\n
L'effet de d\u00e9gazage du fondant utilis\u00e9 dans la fonderie d'aluminium se manifeste principalement sous trois aspects :<\/p>\n
Tout d'abord, lorsque le complexe est \u00e9limin\u00e9, une partie de l'hydrog\u00e8ne complexe absorb\u00e9 par les impuret\u00e9s oxyd\u00e9es est \u00e9galement \u00e9limin\u00e9e. D'autre part, lorsque le fondant se d\u00e9compose ou interagit avec la masse fondue, il forme un produit gazeux qui permet la diffusion et l'\u00e9limination de l'hydrog\u00e8ne. De plus, le film d'oxyde \u00e0 la surface de la masse fondue \u00e9tant dissous, l'hydrog\u00e8ne atomique dissous peut alors facilement se diffuser dans l'atmosph\u00e8re. Cependant, l'effet de d\u00e9gazage du fondant est limit\u00e9. Dans les conditions de production, la teneur en hydrog\u00e8ne ne peut descendre qu\u2019\u00e0 un niveau de 0,2 \u00e0 0,25 ml\/100 g d\u2019Al. L\u2019utilisation du syst\u00e8me en ligne AdTech \u00e9quipement de purification par d\u00e9gazage<\/a> peut r\u00e9duire encore davantage la teneur en hydrog\u00e8ne de l'aluminium fondu.<\/p>","protected":false},"excerpt":{"rendered":"The main function of aluminum smelter flux is to remove slag and gas, and is widely used in aluminum furnaces and foundries. The slag removal…<\/p>","protected":false},"author":1,"featured_media":10340,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10339","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\n
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