{"id":2561,"date":"2020-07-02T10:27:20","date_gmt":"2020-07-02T10:27:20","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2561"},"modified":"2020-09-28T05:42:03","modified_gmt":"2020-09-28T05:42:03","slug":"casting-purification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/casting-purification\/","title":{"rendered":"Purification par coul\u00e9e"},"content":{"rendered":"<p>Le bain d'aluminium que la tige en aluminium 6061 aspire hors de la cellule \u00e9lectrolytique contient diverses impuret\u00e9s ; il doit donc \u00eatre purifi\u00e9 avant la coul\u00e9e. Dans l'industrie, on utilise principalement des m\u00e9thodes de purification de la coul\u00e9e telles que la clarification, le flux et le gaz, mais on recourt \u00e9galement \u00e0 la solidification dirig\u00e9e et \u00e0 la filtration.<\/p>\n<p><strong>Technologie de purification des barres d'aluminium moul\u00e9es<\/strong><\/p>\n<p>La purification du flux consiste \u00e0 utiliser le\u00a0<a href=\"http:\/\/www.alalloycasting.com\/fr\/fluxes\/\">flux<\/a>\u00a0ajout\u00e9 \u00e0 l'aluminium en fusion pour former un grand nombre de fines gouttelettes, de sorte que les oxydes pr\u00e9sents dans l'aluminium en fusion soient mouill\u00e9s, adsorb\u00e9s et dissous par ces gouttelettes, formant ainsi de nouvelles gouttelettes \u00e0 la surface ; apr\u00e8s refroidissement, l'\u00e9cume est \u00e9limin\u00e9e. Le fondant utilis\u00e9 pour la purification est compos\u00e9 de sels pr\u00e9sentant un faible point de fusion, une faible densit\u00e9, une faible tension superficielle, une activit\u00e9 \u00e9lev\u00e9e et une forte capacit\u00e9 d\u2019adsorption des scories oxyd\u00e9es. Lors de son utilisation, placez d\u2019abord un petit morceau de fondant dans la cage en fer, puis ins\u00e9rez-la au fond du four de m\u00e9lange pour agiter d\u2019avant en arri\u00e8re. Une fois le flux \u00e9puis\u00e9, retirez la cage en fer et laissez reposer pendant 5 \u00e0 10 minutes. Retirez l'\u00e9cume de surface avant de proc\u00e9der \u00e0 la coul\u00e9e. Le flux peut \u00e9galement \u00eatre pr\u00e9lev\u00e9 \u00e0 la surface selon les besoins pour recouvrir le bain.<\/p>\n<p><strong>M\u00e9thode de purification des barres d'aluminium moul\u00e9es<\/strong><\/p>\n<p>La purification au gaz est l'une des principales m\u00e9thodes de purification des barres d'aluminium 6061. Le gaz utilis\u00e9 est le chlore, l'azote ou un m\u00e9lange de chlore et d'azote.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5190\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Casting-Purification.jpg\" alt=\"Purification par coul\u00e9e\" width=\"400\" height=\"320\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Casting-Purification.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Casting-Purification-300x240.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>(1) Purification du chlore gazeux. Auparavant, le chlore gazeux actif \u00e9tait utilis\u00e9 comme agent de nettoyage (m\u00e9thode de chloration). Dans cette m\u00e9thode, lorsque le chlore gazeux est introduit dans l'aluminium liquide, il se forme une grande quantit\u00e9 de fines bulles d'AlCl\u2083, qui se m\u00e9langent suffisamment \u00e0 l'aluminium liquide. L\u2019hydrog\u00e8ne dissous dans l\u2019aluminium liquide et certaines inclusions m\u00e9caniques sont adsorb\u00e9s sur les bulles d\u2019AlCl\u2083, puis \u00e9vacu\u00e9s lorsque celles-ci remontent \u00e0 la surface de l\u2019aluminium liquide. Le chlore gazeux permet \u00e9galement de chlorer certains \u00e9l\u00e9ments dont la valence est plus n\u00e9gative que celle des barres d\u2019aluminium 6061. Par exemple, le calcium, le sodium, le magn\u00e9sium, etc. peuvent \u00eatre s\u00e9par\u00e9s gr\u00e2ce \u00e0 la formation de chlorures correspondants sous l\u2019action du chlore gazeux. Par cons\u00e9quent, la m\u00e9thode de chloration est une m\u00e9thode tr\u00e8s efficace de purification de l\u2019aluminium primaire. La quantit\u00e9 de chlore gazeux n\u00e9cessaire est de 500 \u00e0 700 g par tonne d\u2019aluminium. Cependant, l\u2019oxyg\u00e8ne \u00e9tant toxique et relativement co\u00fbteux, et afin d\u2019\u00e9viter la pollution atmosph\u00e9rique et de r\u00e9duire le co\u00fbt de production des lingots d\u2019aluminium, la m\u00e9thode de chloration a \u00e9t\u00e9 progressivement abandonn\u00e9e dans l\u2019industrie moderne de l\u2019aluminium au profit d\u2019une m\u00e9thode de purification \u00e0 l\u2019aide d\u2019un gaz inerte : l\u2019azote.<\/p>\n<p>(2) Proc\u00e9d\u00e9 de purification \u00e0 l'azote. \u00c9galement appel\u00e9 \u00ab proc\u00e9d\u00e9 de purification continue sans fum\u00e9e \u00bb, il utilise des billes d'alumine (418 mm) comme milieu filtrant. L'azote (N\u2082) est inject\u00e9 directement dans l'aluminium fondu. L'aluminium fondu est introduit en continu dans le four de purification, traverse la couche filtrante de billes d'alumine et est balay\u00e9 par de l'azote, ce qui permet d'\u00e9liminer les inclusions non m\u00e9talliques et l'hydrog\u00e8ne dissous pr\u00e9sents dans l'aluminium fondu, avant d'\u00eatre \u00e9vacu\u00e9 en continu. Les fines bulles d'azote sont ainsi r\u00e9parties uniform\u00e9ment et jouent un r\u00f4le de purification dans l'aluminium fondu trait\u00e9. L\u2019azote ne pollue pas l\u2019atmosph\u00e8re et pr\u00e9sente une grande capacit\u00e9 de traitement de purification. Il permet de traiter 200 \u00e0 600 kg d\u2019aluminium liquide par minute. La perte d\u2019aluminium caus\u00e9e par le processus de purification est relativement faible, ce qui explique son utilisation d\u00e9sormais tr\u00e8s r\u00e9pandue. Cependant, contrairement au chlore gazeux, il ne permet pas d\u2019\u00e9liminer le calcium, le sodium et le magn\u00e9sium de l\u2019aluminium liquide.<\/p>\n<p>(3) Proc\u00e9d\u00e9 de purification par m\u00e9lange de gaz. Un m\u00e9lange de chlore et d\u2019azote est utilis\u00e9 pour purifier l\u2019aluminium liquide. La tige d\u2019aluminium 6061 sert, d\u2019une part, \u00e0 \u00e9liminer l\u2019hydrog\u00e8ne et les oxydes, et, d\u2019autre part, \u00e0 \u00e9liminer certaines impuret\u00e9s m\u00e9talliques (telles que le magn\u00e9sium) pr\u00e9sentes dans l\u2019aluminium. La composition courante est de 90% d'azote + 10 % de chlore. Il existe \u00e9galement une composition de 10% de chlore + 10% de dioxyde de carbone + 80% d\u2019azote. Cette composition offre de meilleurs r\u00e9sultats : le dioxyde de carbone favorise la diffusion du chlore et de l\u2019azote et permet de r\u00e9duire la dur\u00e9e de l\u2019op\u00e9ration.<\/p>","protected":false},"excerpt":{"rendered":"<p>The aluminum liquid that 6061 aluminum rod sucks out from the electrolytic cell contains various impurities, so it needs to be purified before casting. In&hellip;<\/p>","protected":false},"author":1,"featured_media":5191,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[741,740,734,724,738,712,720,735,725,737,736,728,727,726,733,739,713,701,704,692,708,707,710,719,711,729,731,693,730,716,714,723,722,721,700,696,702,703,715,695,694,697,698,706,699,732,705,717,718,709],"class_list":["post-2561","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminium-casting-company-flux-purification","tag-aluminium-die-casting-companies-flux-purification","tag-aluminium-gravity-die-casting-flux-purification","tag-aluminium-hot-top-flux-purification","tag-aluminium-investment-casting-flux-purification","tag-aluminium-strip-flux-purification","tag-aluminum-billet-casting-flux-purification","tag-aluminum-can-foundry-flux-purification","tag-aluminum-casting-companies-flux-purification","tag-aluminum-casting-equipment-flux-purification","tag-aluminum-casting-grain-flux-purification","tag-aluminum-casting-near-me-flux-purification","tag-aluminum-die-casting-companies-flux-purification","tag-aluminum-foundry-near-me-flux-purification","tag-aluminum-gravity-casting-flux-purification","tag-aluminum-gravity-die-casting-flux-purification","tag-aluminum-ingot-flux-purification","tag-aluminum-metallurgy-flux-purification","tag-aluminum-or-aluminium-flux-purification","tag-aluminum-rod-casting-purification-technology","tag-cast-aluminum-flux-purification","tag-castable-refractory-flux-purification","tag-ceramic-insulation-flux-purification","tag-ceramic-shell-casting-flux-purification","tag-continuous-casting-flux-purification","tag-die-casting-companies-near-me-flux-purification","tag-electric-aluminum-foundry-flux-purification","tag-flux-purification","tag-foundry-aluminum-casting-flux-purification","tag-foundry-factory-flux-purification","tag-foundry-flux-purification","tag-hot-top-aluminium-flux-purification","tag-hot-top-cast-flux-purification","tag-hot-top-casting-flux-purification","tag-liquid-aluminum-flux-purification","tag-materials-and-metallurgy-flux-purification","tag-melting-aluminum-flux-purification","tag-melting-point-of-aluminum-flux-purification","tag-metal-foundry-flux-purification","tag-metal-metallurgy-flux-purification","tag-metallurgical-engineering-flux-purification","tag-metallurgical-industry-flux-purification","tag-metallurgical-products-flux-purification","tag-metallurgy-company-flux-purification","tag-metallurgy-of-aluminium-flux-purification","tag-molten-aluminum-casting-flux-purification","tag-molten-aluminum-flux-purification","tag-shell-casting-flux-purification","tag-shell-mould-casting-flux-purification","tag-what-is-flux-purification"],"yoast_head":"<!-- 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