{"id":3474,"date":"2020-08-07T06:50:38","date_gmt":"2020-08-07T06:50:38","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3474"},"modified":"2020-08-07T06:50:38","modified_gmt":"2020-08-07T06:50:38","slug":"degassing-with-nitrogen","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-with-nitrogen\/","title":{"rendered":"D\u00e9gazage \u00e0 l'azote"},"content":{"rendered":"<p>Le d\u00e9gazage \u00e0 l'azote est l'une des m\u00e9thodes de purification par adsorption. La purification par adsorption d\u00e9signe le contact direct entre l'aluminium fondu et un adsorbant (tel que divers gaz, liquides, agents d'affinage solides et m\u00e9dias filtrants), de sorte que l'adsorbant et le gaz pr\u00e9sent dans le bain fondu ainsi que les inclusions d'oxyde solide subissent une action physique, chimique ou m\u00e9canique permettant d'atteindre l'objectif de d\u00e9gazage et d'\u00e9limination des impuret\u00e9s. Les \u00e9quipements de purification par adsorption comprennent un dispositif de d\u00e9gazage en ligne et un caisson de filtration CFF.<\/p>\n<p><a href=\"http:\/\/www.alalloycasting.com\/fr\/online-degassing-device\/\">Dispositif de d\u00e9gazage en ligne<\/a> Cette m\u00e9thode de d\u00e9gazage par flottation de bulles consiste \u00e0 injecter un gaz inerte (tel que l'azote, l'argon, etc.) dans le bain d'aluminium fondu afin de former des bulles. Sous l'effet de la diff\u00e9rence de pression partielle, l'hydrog\u00e8ne pr\u00e9sent dans le bain fondu se diffuse dans ces bulles et est \u00e9limin\u00e9 lors de la remont\u00e9e de celles-ci, ce qui permet d'atteindre l'objectif de d\u00e9gazage. Au cours du processus de flottation, les bulles peuvent \u00e9galement absorber certaines inclusions oxyd\u00e9es, ce qui permet d'\u00e9liminer les impuret\u00e9s.<\/p>\n<figure id=\"attachment_3476\" aria-describedby=\"caption-attachment-3476\" style=\"width: 500px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3476\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/08\/Degassing-With-Nitrogen-1.jpg\" alt=\"D\u00e9gazage \u00e0 l&#039;azote\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Degassing-With-Nitrogen-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Degassing-With-Nitrogen-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-3476\" class=\"wp-caption-text\">D\u00e9gazage \u00e0 l'azote<\/figcaption><\/figure>\n<p>L'efficacit\u00e9 de la m\u00e9thode de d\u00e9gazage de l'aluminium d\u00e9pend, d'une part, de la nature et de la puret\u00e9 du gaz inerte, et, d'autre part, de la taille et du degr\u00e9 de dispersion des bulles dans la masse fondue. Plus le diam\u00e8tre des bulles inject\u00e9es est petit, plus leur r\u00e9partition est homog\u00e8ne ; plus la surface sp\u00e9cifique des bulles est grande, plus la distance de diffusion de l'hydrog\u00e8ne vers les bulles est courte, plus la remont\u00e9e des bulles est lente et plus le taux de d\u00e9gazage est \u00e9lev\u00e9. De plus, cela d\u00e9pend \u00e9galement de la dur\u00e9e d'injection, ainsi que de param\u00e8tres de proc\u00e9d\u00e9 tels que la pression et la temp\u00e9rature d'injection, etc.<\/p>\n<p>La m\u00e9thode de d\u00e9gazage \u00e0 l'azote est la plus performante parmi les techniques de soufflage. Elle repose principalement sur la forme de la t\u00eate rotative et sur la rupture des bulles par celle-ci \u00e0 une vitesse de rotation suffisamment \u00e9lev\u00e9e pour contr\u00f4ler la taille et la r\u00e9partition des bulles. La t\u00eate rotative constitue le c\u0153ur technique de ces m\u00e9thodes. Des t\u00eates rotatives diff\u00e9rentes produisent des bulles de tailles diff\u00e9rentes. Quelle que soit la m\u00e9thode utilis\u00e9e, les bulles g\u00e9n\u00e9r\u00e9es sont g\u00e9n\u00e9ralement de l'ordre du millim\u00e8tre. La vitesse de rotation de la t\u00eate rotative est comprise entre 300 et 500 tr\/min, et la pression de soufflage est constante, comprise entre 2 et 3 atmosph\u00e8res.<\/p>\n<p>Les inconv\u00e9nients de la m\u00e9thode d'injection rotative se traduisent principalement par un faible taux de d\u00e9gazage, g\u00e9n\u00e9ralement inf\u00e9rieur \u00e0 70% ; la taille des bulles n\u2019est pas suffisamment petite pour atteindre le niveau du \u03bcm, ce qui est d\u00e9termin\u00e9 par la forme de la t\u00eate rotative ; si la vitesse de rotation de la t\u00eate rotative est trop \u00e9lev\u00e9e, cela peut facilement provoquer un tourbillonnement de la masse fondue, cr\u00e9er un ph\u00e9nom\u00e8ne d\u2019aspiration et r\u00e9duire la pression dans la zone centrale de la masse fondue, entra\u00eenant ainsi un ph\u00e9nom\u00e8ne de moussage. Par cons\u00e9quent, apr\u00e8s le d\u00e9gazage par rotation de l\u2019aluminium, une filtration CFF est n\u00e9cessaire.<\/p>","protected":false},"excerpt":{"rendered":"<p>Degassing With Nitrogen is one method of adsorption purification. Adsorption purification refers to the direct contact between aluminum melt and adsorbent (such as various gases,&hellip;<\/p>","protected":false},"author":1,"featured_media":3475,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[2150,2146,2149,2148,2147,2142,2145,2155,2132,2144,2152,2143,2134,2154,2133,2156,2158,2157,2159,2161,2160,2153,2151,2136,2137,2141,2138,2139,2140,2135],"class_list":["post-3474","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-degassing-with-nitrogen-alpha-aluminium-singapore","tag-degassing-with-nitrogen-aluminium-singapore","tag-degassing-with-nitrogen-aluminium-singapore-buy","tag-degassing-with-nitrogen-aluminium-singapore-price","tag-degassing-with-nitrogen-aluminium-singapore-supplier","tag-degassing-with-nitrogen-aluminum-singapore","tag-degassing-with-nitrogen-anodized-aluminum-singapore","tag-degassing-with-nitrogen-apex-aluminium-singapore","tag-degassing-with-nitrogen-hal-aluminum-thailand","tag-degassing-with-nitrogen-lhl-aluminum-singapore","tag-degassing-with-nitrogen-nanshan-aluminium-singapore","tag-degassing-with-nitrogen-nanshan-aluminum-singapore","tag-degassing-with-nitrogen-nikkei-mc-aluminium","tag-degassing-with-nitrogen-pacific-aluminium-singapore","tag-degassing-with-nitrogen-rec-aluminum-thailand","tag-degassing-with-nitrogen-singapore-aluminium","tag-degassing-with-nitrogen-singapore-aluminium-group-pte-ltd","tag-degassing-with-nitrogen-singapore-aluminium-suppier","tag-degassing-with-nitrogen-singapore-aluminum","tag-degassing-with-nitrogen-singapore-aluminum-company","tag-degassing-with-nitrogen-singapore-aluminum-supplier","tag-degassing-with-nitrogen-sunjet-aluminium-singapore","tag-degassing-with-nitrogen-tc-aluminium-singapore","tag-degassing-with-nitrogen-thailand-aluminum","tag-degassing-with-nitrogen-thailand-aluminum-factory","tag-degassing-with-nitrogen-thailand-aluminum-foil","tag-degassing-with-nitrogen-thailand-aluminum-industry","tag-degassing-with-nitrogen-thailand-aluminum-scrap","tag-degassing-with-nitrogen-thailand-aluminum-smelter","tag-degassing-with-nitrogen-united-aluminum-thailand"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Degassing With Nitrogen,Rotary Degassing Aluminum<\/title>\n<meta name=\"description\" content=\"Degassing With Nitrogen is one method of adsorption purification. 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