{"id":6183,"date":"2020-11-04T09:03:43","date_gmt":"2020-11-04T09:03:43","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6183"},"modified":"2020-11-04T09:03:43","modified_gmt":"2020-11-04T09:03:43","slug":"granular-refining-agent","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/granular-refining-agent\/","title":{"rendered":"Agent d'affinage granulaire"},"content":{"rendered":"<p>L'agent d'affinage granulaire permet une bonne \u00e9limination des scories (oxydes, borures et carbures) et des impuret\u00e9s (\u00e9l\u00e9ments alcalins : Na, Ca et Li) dans le bain d'aluminium fondu. Le principe d'\u00e9limination des scories est le suivant : lorsque l'agent d'affinage \u00e0 particules solides est pulv\u00e9ris\u00e9 dans le bain d'aluminium fondu \u00e0 l'aide d'un gaz inerte, les particules solides fondent rapidement pour former des gouttelettes. La densit\u00e9 de ces gouttelettes \u00e9tant inf\u00e9rieure \u00e0 celle du bain d'aluminium fondu, la tension superficielle des inclusions de scories est r\u00e9duite. Il poss\u00e8de une forte capacit\u00e9 \u00e0 mouiller et \u00e0 adsorber les inclusions de scories ; lorsque celles-ci sont adsorb\u00e9es par les gouttelettes de fondant, elles remontent \u00e0 la surface et sont expuls\u00e9es du bain fondu. Parall\u00e8lement, une fois que les gouttelettes de fondant remontent \u00e0 la surface, une couche liquide se forme et recouvre la surface du bain d\u2019aluminium en fusion, r\u00e9duisant ainsi les pertes par combustion oxydative du bain d\u2019aluminium en fusion. Le principe d\u2019\u00e9limination des impuret\u00e9s de l\u2019agent d\u2019affinage granulaire est le suivant : une fois que le compos\u00e9 contenant des ions magn\u00e9sium pr\u00e9sent dans l\u2019agent d\u2019affinage p\u00e9n\u00e8tre dans le bain d\u2019aluminium fondu, il r\u00e9agit avec les m\u00e9taux alcalins Na, Ca et Li pour lib\u00e9rer des atomes de magn\u00e9sium dans le bain d\u2019alliage d\u2019aluminium, tout en absorbant les m\u00e9taux alcalins Na, Ca et Li sont amen\u00e9s \u00e0 la surface du bain d\u2019aluminium fondu, jouant ainsi le r\u00f4le d\u2019\u00e9limination des m\u00e9taux alcalins.<\/p>\n<p>Lors de la fusion des alliages d\u2019aluminium, des inclusions et des gaz se forment souvent, ce qui affecte consid\u00e9rablement la qualit\u00e9 des lingots et des produits en aluminium. Les inclusions courantes comprennent les oxydes, les carbures, les nitrures, les borures, etc. Parmi celles-ci, ce sont les oxydes (tels que l\u2019Al\u2082O\u2083 et le MgO) qui polluent le plus la masse fondue d\u2019alliage d\u2019aluminium. Ces inclusions servent non seulement de support aux gaz, mais entra\u00eenent \u00e9galement une augmentation de la teneur en gaz dans la masse fondue, ce qui provoque des d\u00e9fauts, tels que des inclusions de scories et un manque de densit\u00e9 dans le lingot. De plus, les mati\u00e8res premi\u00e8res et auxiliaires impures utilis\u00e9es dans la fusion des alliages d\u2019aluminium apportent \u00e9galement des impuret\u00e9s nocives au bain de fusion, telles que des m\u00e9taux alcalins comme le Na, le Ca, le Li, etc., qui r\u00e9duisent les propri\u00e9t\u00e9s physiques et chimiques des alliages d\u2019aluminium. Le sodium (Na) pr\u00e9sente une teneur \u00e9lev\u00e9e en magn\u00e9sium (Mg). L\u2019alliage d\u2019aluminium est alors susceptible de subir une \u201c fragilisation sodique \u201d et voit \u00e9galement sa fluidit\u00e9 r\u00e9duite. Par cons\u00e9quent, dans la production de mat\u00e9riaux en alliage d\u2019aluminium, des r\u00e9glementations strictes s\u2019appliquent concernant la teneur en scories, la teneur en gaz et la teneur en \u00e9l\u00e9ments d\u2019impuret\u00e9 dans la masse fondue d\u2019alliage d\u2019aluminium.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6184\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/11\/Granular-Refining-Agent-1.jpg\" alt=\"Agent d&#039;affinage granulaire\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Granular-Refining-Agent-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Granular-Refining-Agent-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Afin d'\u00e9liminer les gaz et les inclusions pr\u00e9sents dans la masse fondue d'alliage d'aluminium, l'industrie de la fusion et de la coul\u00e9e de l'aluminium utilise g\u00e9n\u00e9ralement un m\u00e9lange <a href=\"http:\/\/www.alalloycasting.com\/fr\/refining-agents\/\">agent de raffinage<\/a> de gaz inerte (N\u2082, Ar, etc.) et de flux en poudre (NaCl, KCl, Na\u2082SiF\u2086, etc.), qui est pulv\u00e9ris\u00e9 dans le four de fusion. M\u00e9thode de traitement de purification par affinage. Afin d\u2019\u00e9liminer les impuret\u00e9s nocives (Na, Li, Ca), on recourt \u00e0 un affinage par gaz chlor\u00e9. Cependant, ce proc\u00e9d\u00e9 d\u2019affinage traditionnel pr\u00e9sente de nombreux inconv\u00e9nients, notamment : la production d\u2019une grande quantit\u00e9 de gaz nocifs et de fum\u00e9es contenant du chlore et du fluor, ce qui pollue l\u2019environnement ; la pr\u00e9sence sous forme solide dans la masse fondue de l\u2019agent d\u2019affinage en poudre m\u00e9lang\u00e9, ce qui favorise les inclusions de scories. Les effets d\u2019adsorption et de dissolution ne sont pas \u00e9vidents, et les effets de d\u00e9gazage et d\u2019\u00e9limination des scories sont limit\u00e9s. En cas de mauvaise manipulation, des inclusions de fondant peuvent facilement se former et polluer la masse fondue d\u2019alliage d\u2019aluminium ; les r\u00e9actions chimiques locales \u00e0 haute temp\u00e9rature survenant pendant le processus d\u2019affinage provoquent une grave oxydation de l\u2019aluminium, etc.<\/p>","protected":false},"excerpt":{"rendered":"<p>The granular refining agent has a good slag removal (oxide, boride, and carbide) and impurity removal (alkali metal elements Na, Ca, and Li) in the&hellip;<\/p>","protected":false},"author":1,"featured_media":6185,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120,138],"tags":[6091,6106,6116,6095,6115,6103,6104,6111,6114,6099,6107,6105,6097,6113,6094,6110,6100,6101,6102,6108,6093,6092,6112,6098,6109,6096],"class_list":["post-6183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes","category-seo","tag-granular-refining-agent-for-rusal","tag-granular-refining-agent-for-rusal-alumina","tag-granular-refining-agent-for-rusal-aluminium","tag-granular-refining-agent-for-rusal-aluminum","tag-granular-refining-agent-for-rusal-america","tag-granular-refining-agent-for-rusal-company","tag-granular-refining-agent-for-rusal-group","tag-granular-refining-agent-for-rusal-guyana","tag-granular-refining-agent-for-rusal-hong-kong","tag-granular-refining-agent-for-rusal-marketing","tag-granular-refining-agent-for-rusal-marketing-gmbh","tag-granular-refining-agent-for-rusal-news","tag-granular-refining-agent-for-rusal-plc","tag-granular-refining-agent-for-rusal-russia","tag-granular-refining-agent-for-rusal-stock-price","tag-granular-refining-agent-for-rusal-zug","tag-granular-refining-agent-for-russian-aluminium","tag-granular-refining-agent-for-russian-aluminium-company","tag-granular-refining-agent-for-russian-aluminum","tag-granular-refining-agent-for-russian-companies-in-ireland","tag-granular-refining-agent-for-russian-metal","tag-granular-refining-agent-for-uc-rusal","tag-granular-refining-agent-for-uc-rusal-latest-news","tag-granular-refining-agent-for-united-co-rusal","tag-granular-refining-agent-for-united-company-rusal","tag-granular-refining-agent-for-united-company-rusal-plc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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