{"id":4608,"date":"2020-09-09T06:58:31","date_gmt":"2020-09-09T06:58:31","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4608"},"modified":"2020-09-09T06:58:31","modified_gmt":"2020-09-09T06:58:31","slug":"rotating-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/rotating-degassing\/","title":{"rendered":"D\u00e9gazage par rotation"},"content":{"rendered":"<p>La m\u00e9thode de d\u00e9gazage par rotation est actuellement la plus r\u00e9pandue pour le d\u00e9gazage et la purification de l'aluminium fondu. Le principe du d\u00e9gazage par rotation consiste \u00e0 faire passer un gaz inerte ou un gaz actif insoluble dans l'aluminium fondu, ou \u00e0 ajouter un sel de chlore (chlorure) qui r\u00e9agit avec l'aluminium fondu pour g\u00e9n\u00e9rer un gaz, ce qui provoque la formation d'un grand nombre de bulles qui s'\u00e9chappent de l'aluminium fondu.<\/p>\n<p>Les atomes d'hydrog\u00e8ne dissous dans l'aluminium fondu migrent vers la surface des bulles de purification, sont adsorb\u00e9s \u00e0 la surface de ces bulles, forment des hydrures au sein des bulles d'hydrog\u00e8ne, puis s'\u00e9chappent finalement de l'aluminium fondu par le biais d'un processus cin\u00e9tique \u00e0 mesure que les bulles remontent \u00e0 la surface, achevant ainsi le d\u00e9gazage et la purification de l'aluminium fondu. Il s'agit d'un processus dans lequel l'hydrog\u00e8ne se diffuse en phase liquide et est adsorb\u00e9 par les bulles.<\/p>\n<p>La m\u00e9thode traditionnelle de flottation \u00e0 bulles de <a href=\"http:\/\/www.alalloycasting.com\/fr\/aluminum-purification-technology\/\">technologie de purification par d\u00e9gazage<\/a>, telles que la m\u00e9thode de soufflage \u00e0 tube unique et celle \u00e0 t\u00eate de soufflage \u00e0 plusieurs orifices, ne permettent de r\u00e9pondre qu\u2019\u00e0 certaines conditions, et il est difficile de satisfaire simultan\u00e9ment aux exigences susmentionn\u00e9es. Bien que la m\u00e9thode \u00e0 t\u00eate de soufflage \u00e0 plusieurs orifices permette de produire des bulles plus petites que la m\u00e9thode \u00e0 tube unique, l\u2019am\u00e9lioration est minime. En effet, comme les bulles remontent verticalement pendant le d\u00e9gazage dans ces deux m\u00e9thodes, si l\u2019apport d\u2019air est augment\u00e9, la surface du liquide situ\u00e9e directement au-dessus de la buse sera nettement soulev\u00e9e par l\u2019effet de la remont\u00e9e des bulles, provoquant un brassage et des projections d\u2019aluminium fondu. Par cons\u00e9quent, elles ne peuvent pas jouer le r\u00f4le de facteur principal du flux d\u2019air.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4611\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotating-Degassing-2.jpg\" alt=\"D\u00e9gazage par rotation\" width=\"400\" height=\"500\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotating-Degassing-2.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotating-Degassing-2-240x300.jpg 240w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>\u00c0 l'heure actuelle, le principe de la buse rotative, qui suscite un int\u00e9r\u00eat croissant, r\u00e9pond aux conditions dynamiques de d\u00e9gazage requises par le proc\u00e9d\u00e9 de flottation \u00e0 bulles. La diff\u00e9rence par rapport aux proc\u00e9d\u00e9s de purification ant\u00e9rieurs r\u00e9side dans le fait que le gaz de purification est introduit par l\u2019orifice de l\u2019arbre ou par l\u2019interstice entre l\u2019arbre et le manchon ; il est fragment\u00e9 lorsqu\u2019il traverse l\u2019aube inf\u00e9rieure de la buse rotative, puis projet\u00e9 \u00e0 grande vitesse. L\u2019aluminium fondu en rotation remonte alors jusqu\u2019au niveau du liquide.<\/p>\n<p>La m\u00e9thode de la buse rotative permet de tirer pleinement parti des avantages de la flottation par bulles pour l'\u00e9limination de l'hydrog\u00e8ne. Le principe repose sur le fait que le liquide forme un jet sous l'action puissante de la buse, et que les bulles sont dispers\u00e9es de mani\u00e8re homog\u00e8ne dans le puits fragment\u00e9 sous l'effet combin\u00e9 de la buse et du jet.<\/p>\n<p>Lorsque la vitesse de rotation est faible, la contrainte de cisaillement exerc\u00e9e sur les bulles est moindre et celles-ci sont plus volumineuses, prenant la forme d\u2019un chapeau de paille. Lorsque la vitesse de rotation est \u00e9lev\u00e9e, la contrainte de cisaillement exerc\u00e9e sur les bulles augmente, leur volume diminue sensiblement et elles se r\u00e9partissent sous une forme sph\u00e9rique. Le nombre de bulles augmente, ce qui accro\u00eet la surface de contact des bulles avec l'aluminium fondu, ce qui am\u00e9liore consid\u00e9rablement la dynamique de d\u00e9gazage.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4610\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotating-Degassing.jpg\" alt=\"D\u00e9gazage par rotation\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotating-Degassing.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotating-Degassing-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>La bulle est bris\u00e9e par l'action du liquide \u00e9ject\u00e9 par la pale et s'\u00e9loigne simultan\u00e9ment de la buse. Son d\u00e9placement est li\u00e9 \u00e0 la vitesse et \u00e0 la forme de la pale. Lorsque la vitesse est \u00e9lev\u00e9e, la t\u00eate s'agrandit en cons\u00e9quence. Plus le mouvement radial de la bulle s'allonge, plus la r\u00e9partition des bulles devient diffuse. Lorsque la vitesse de rotation est faible, les bulles s'accumulent pr\u00e8s de la buse, ce qui accentue leur tendance \u00e0 se regrouper. Lorsque la vitesse de rotation est \u00e9lev\u00e9e, les bulles se dispersent. La r\u00e9partition est alors plus uniforme. \u00c0 mesure que la vitesse augmente, la zone d'action du liquide \u00e9ject\u00e9 par les pales s'\u00e9tend, ce qui permet de poursuivre le processus de rupture des bulles.<\/p>\n<p>La structure de la buse rotative est le facteur le plus important dans le processus de purification de l'aluminium liquide. Selon sa structure et ses param\u00e8tres de conception, le degr\u00e9 d'agitation du liquide varie, tout comme la taille et le nombre de bulles g\u00e9n\u00e9r\u00e9es, ce qui influe directement sur l'efficacit\u00e9 de l'\u00e9limination de l'hydrog\u00e8ne. \u00c0 vitesse et d\u00e9bit de gaz identiques, les diff\u00e9rentes buses rotatives pr\u00e9sentent des coefficients de transfert de masse apparents diff\u00e9rents.<\/p>","protected":false},"excerpt":{"rendered":"<p>Rotating Degassing method is currently the most widely used method of degassing and purifying molten aluminum. The principle of rotating degassing is to pass an&hellip;<\/p>","protected":false},"author":1,"featured_media":4609,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4669,4670],"class_list":["post-4608","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-rotating-degassing","tag-rotating-degassing-purification-technology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rotating Degassing Purification Technology for Molten Aluminum<\/title>\n<meta name=\"description\" content=\"Rotating Degassing method is widely used method of purifying molten aluminum. 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