{"id":6443,"date":"2020-11-13T08:56:36","date_gmt":"2020-11-13T08:56:36","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6443"},"modified":"2020-11-13T08:56:36","modified_gmt":"2020-11-13T08:56:36","slug":"control-of-alkali-metal","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/control-of-alkali-metal\/","title":{"rendered":"Contr\u00f4le des m\u00e9taux alcalins"},"content":{"rendered":"<p>R\u00e9duire efficacement la teneur en m\u00e9taux alcalins de la masse d'aluminium fondue avant la coul\u00e9e constitue la garantie fondamentale pour la production de lingots d'alliage d'aluminium de haute qualit\u00e9, permettant ainsi de r\u00e9pondre aux exigences de performance de transformation des alliages d'aluminium de haute pr\u00e9cision, d'accro\u00eetre la valeur ajout\u00e9e des produits transform\u00e9s \u00e0 base d'aluminium de notre pays et de parvenir \u00e0 l'optimisation et \u00e0 la modernisation de la structure des produits. Par cons\u00e9quent, le contr\u00f4le de la teneur en m\u00e9taux alcalins et alcalino-terreux de la masse fondue d\u2019alliage d\u2019aluminium constitue l\u2019un des indicateurs fondamentaux du contr\u00f4le qualit\u00e9.<\/p>\n<p>Les principales mati\u00e8res premi\u00e8res utilis\u00e9es pour la production d'aluminium par \u00e9lectrolyse comprennent l'alumine, les \u00e9lectrolytes, les sels fluor\u00e9s, la cryolite, etc. De ce fait, la solution d'aluminium \u00e9lectrolytique contient in\u00e9vitablement une grande quantit\u00e9 de m\u00e9taux alcalins et alcalino-terreux tels que le sodium, le magn\u00e9sium, le lithium et le calcium, ainsi que des inclusions non m\u00e9talliques (principalement du chlorure d\u2019aluminium, de l\u2019\u00e9lectrolyte, des sels fluor\u00e9s, etc.). \u00c0 l\u2019heure actuelle, la teneur en m\u00e9taux alcalins dans l\u2019aluminium liquide \u00e9lectrolytique produit par la plupart des entreprises d\u2019\u00e9lectrolyse de l\u2019aluminium atteint 40 \u00e0 80 ppm, et la teneur en m\u00e9taux alcalins apr\u00e8s traitement avec les technologies existantes reste sup\u00e9rieure \u00e0 20 ppm ; quant \u00e0 la teneur en sodium des lingots d\u2019aluminium destin\u00e9s \u00e0 la fusion, elle se situe g\u00e9n\u00e9ralement entre 8 et 15 ppm, pouvant atteindre 23 ppm dans certains cas. Les exigences de performance des alliages d\u2019aluminium stipulent \u00e9galement la teneur en m\u00e9taux alcalins et alcalino-terreux. Par exemple, la teneur en m\u00e9taux alcalins, en particulier en Na, doit \u00eatre contr\u00f4l\u00e9e dans les alliages d\u2019aluminium \u00e0 haute teneur en magn\u00e9sium. La teneur en m\u00e9taux alcalins est g\u00e9n\u00e9ralement maintenue en dessous de 5 ppm, et strictement contr\u00f4l\u00e9e en dessous de 2 ppm. AdTech propose <a href=\"http:\/\/www.alalloycasting.com\/fr\/refining-flux\/\">flux de raffinage<\/a> pour le contr\u00f4le des m\u00e9taux alcalins.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6474\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/11\/Control-of-Alkali-Metal-2.jpg\" alt=\"Contr\u00f4le des m\u00e9taux alcalins\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Control-of-Alkali-Metal-2.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Control-of-Alkali-Metal-2-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Utilisations du flux de raffinage<\/strong><\/p>\n<p>Retirez l'emballage, puis pulv\u00e9risez l'agent d'affinage dans le bain fondu \u00e0 l'aide du r\u00e9servoir de pulv\u00e9risation de poudre, sous l'action du gaz vecteur. Placez la sortie de la buse aussi pr\u00e8s que possible du fond du bain fondu et effectuez des mouvements de va-et-vient afin que l'agent d'affinage entre pleinement en contact avec l'aluminium fondu, ce qui permet d'obtenir l'affinage souhait\u00e9. Une fois la pulv\u00e9risation termin\u00e9e, les scories flottant \u00e0 la surface de l'aluminium fondu sont \u00e9limin\u00e9es.<\/p>","protected":false},"excerpt":{"rendered":"<p>Effectively reducing the alkali metal content of the aluminum melt before casting is the basic guarantee for the production of high-quality aluminum alloy ingots to&hellip;<\/p>","protected":false},"author":1,"featured_media":6473,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6443","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Control of Alkali Metal by Aluminum Alloy Casting Flux<\/title>\n<meta name=\"description\" content=\"The control of alkali metal\/alkaline earth metal content of 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