{"id":5839,"date":"2020-10-20T09:08:46","date_gmt":"2020-10-20T09:08:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5839"},"modified":"2020-10-26T03:42:31","modified_gmt":"2020-10-26T03:42:31","slug":"porous-filter-medium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/porous-filter-medium\/","title":{"rendered":"M\u00e9dia filtrant poreux"},"content":{"rendered":"<p>La filtration est un proc\u00e9d\u00e9 de s\u00e9paration solide-liquide qui utilise un milieu filtrant poreux pour retenir les particules solides pr\u00e9sentes dans la suspension et laisser passer le liquide. Par rapport \u00e0 la m\u00e9thode de s\u00e9dimentation par gravit\u00e9, le processus de filtration offre non seulement une vitesse de s\u00e9paration solide-liquide plus rapide, mais aussi une s\u00e9paration plus compl\u00e8te, permettant d'obtenir un g\u00e2teau de filtration et un liquide clair pr\u00e9sentant une teneur en liquide plus faible. La filtration constitue donc une m\u00e9thode universelle et efficace de s\u00e9paration solide-liquide. En g\u00e9n\u00e9ral, la suspension soumise \u00e0 la filtration est appel\u00e9e \u00ab boue de filtration \u00bb, le milieu poreux qui retient les particules solides est appel\u00e9 \u00ab milieu filtrant \u00bb, et la couche de s\u00e9diments retenue sur le milieu filtrant est appel\u00e9e \u00ab g\u00e2teau de filtration \u00bb ou \u00ab r\u00e9sidu de filtration \u00bb. La solution limpide est appel\u00e9e \u00ab filtrat \u00bb.<\/p>\n<p>Diff\u00e9rent <a href=\"http:\/\/www.alalloycasting.com\/fr\/ceramic-filter-media\/\">mat\u00e9riau filtrant<\/a> peut \u00eatre utilis\u00e9 en fonction de la nature de la suspension \u00e0 filtrer et de la taille des particules solides. Lorsque la suspension traverse le milieu filtrant, les particules solides sont retenues et forment une couche de s\u00e9diments. Le filtrat est souvent trouble au d\u00e9but de la filtration et doit \u00eatre r\u00e9introduit dans le filtre. Une fois la couche de s\u00e9diments form\u00e9e, la filtration peut s\u2019effectuer efficacement. Au cours du processus de filtration, l\u2019\u00e9paisseur du g\u00e2teau de filtration ne cesse d\u2019augmenter, la r\u00e9sistance oppos\u00e9e par celui-ci au fluide augmente \u00e9galement, et le d\u00e9bit de filtration diminue progressivement. Par cons\u00e9quent, la r\u00e9sistance du milieu filtrant au fluide est souvent inf\u00e9rieure \u00e0 celle du g\u00e2teau de filtration, et le d\u00e9bit de filtration est principalement d\u00e9termin\u00e9 par l\u2019\u00e9paisseur du g\u00e2teau de filtration et ses caract\u00e9ristiques (principalement sa porosit\u00e9). La porosit\u00e9 du g\u00e2teau de filtration est li\u00e9e \u00e0 la forme des particules solides, \u00e0 la distribution granulom\u00e9trique, \u00e0 la rugosit\u00e9 de surface des particules et aux m\u00e9thodes de remplissage des particules.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5842\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Porous-Filter-Medium.jpg\" alt=\"M\u00e9dia filtrant poreux\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Porous-Filter-Medium.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Porous-Filter-Medium-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>En fonction de ses caract\u00e9ristiques, le g\u00e2teau de filtration peut \u00eatre class\u00e9 en deux cat\u00e9gories : le g\u00e2teau de filtration compressible et le g\u00e2teau de filtration incompressible. Le g\u00e2teau de filtration incompressible est principalement compos\u00e9 de particules min\u00e9rales et de pr\u00e9cipit\u00e9s cristallins ; sa r\u00e9sistance \u00e0 l'\u00e9coulement est moins influenc\u00e9e par la diff\u00e9rence de pression entre les deux faces du g\u00e2teau et par le taux de d\u00e9p\u00f4t des particules. Le g\u00e2teau de filtration compressible est compos\u00e9 de s\u00e9diments amorphes, et sa r\u00e9sistance \u00e0 l'\u00e9coulement augmente avec l'augmentation de la diff\u00e9rence de pression entre les deux faces du g\u00e2teau de filtration et du taux de d\u00e9p\u00f4t de mati\u00e8re.<\/p>\n<p>Le milieu filtrant sert souvent de support au g\u00e2teau de filtration, et c'est la couche de g\u00e2teau de filtration qui assure la fonction de filtration proprement dite. Le milieu filtrant doit pr\u00e9senter une r\u00e9sistance m\u00e9canique suffisante, une bonne r\u00e9sistance \u00e0 la corrosion, de bonnes performances et une faible r\u00e9sistance \u00e0 l'\u00e9coulement du fluide.<\/p>\n<p>Il existe trois types de mat\u00e9riaux filtrants couramment utilis\u00e9s :<\/p>\n<p>(1) Les m\u00e9dias granulaires comprennent notamment le gravier, le sable, les scories de verre, le charbon de bois et la terre de diatom\u00e9es. Ces m\u00e9dias sont constitu\u00e9s de particules dures et peuvent \u00eatre empil\u00e9s en couches pour traiter des suspensions contenant de petites particules solides.<br \/>\n(2) Tissus filtrants : les tissus filtrants peuvent \u00eatre tiss\u00e9s \u00e0 partir de fils m\u00e9talliques ou non m\u00e9talliques. Les mat\u00e9riaux m\u00e9talliques couramment utilis\u00e9s comprennent l\u2019acier inoxydable, le laiton, l\u2019alliage Montessori, etc., tandis que les mat\u00e9riaux non m\u00e9talliques comprennent la laine, le coton, le lin, le nylon, le plastique, le verre, etc. Le choix du mat\u00e9riau de la toile filtrante doit principalement tenir compte de facteurs tels que la corrosivit\u00e9 du liquide, la temp\u00e9rature de fonctionnement des particules solides et la r\u00e9sistance \u00e0 l\u2019usure.<br \/>\n(3) Milieux solides poreux : on utilise couramment des c\u00e9ramiques poreuses, du verre poreux, des m\u00e9taux poreux, des plastiques poreux, etc., souvent sous forme de plaques ou de tubes. Ce type de milieu pr\u00e9sente une petite taille de pores, une r\u00e9sistance m\u00e9canique \u00e9lev\u00e9e, ainsi qu\u2019une r\u00e9sistance \u00e0 la corrosion par les acides, les alcalis, les sels et les solvants organiques. Il convient \u00e0 la filtration de mati\u00e8res contenant des particules fines. L'inconv\u00e9nient est que les micropores s'obstruent facilement et doivent \u00eatre r\u00e9g\u00e9n\u00e9r\u00e9s r\u00e9guli\u00e8rement (par lavage \u00e0 contre-courant ou par traitement chimique) afin de conserver leur capacit\u00e9 de filtration.<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtration is a solid-liquid separation process that uses a porous filter medium to intercept solid particles in the suspension and let the liquid pass through.&hellip;<\/p>","protected":false},"author":1,"featured_media":5841,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[5849,5836,5848,5834,5831,5832,5835,5833,5837,5838,5840,5839,5841,5846,5842,5845,5843,5847,5844],"class_list":["post-5839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-porous-filter-medium-for-alcom-aluminum-malaysia","tag-porous-filter-medium-for-aluminium-batangan-jakarta","tag-porous-filter-medium-for-aluminum-malaysia","tag-porous-filter-medium-for-asahan-aluminium","tag-porous-filter-medium-for-inalum","tag-porous-filter-medium-for-inalum-adalah","tag-porous-filter-medium-for-inalum-indonesia","tag-porous-filter-medium-for-indonesia-asahan-aluminium","tag-porous-filter-medium-for-malaysia-aluminium","tag-porous-filter-medium-for-malaysia-aluminium-alloy","tag-porous-filter-medium-for-malaysia-aluminium-scrap","tag-porous-filter-medium-for-malaysia-aluminium-smelter","tag-porous-filter-medium-for-malaysia-aluminum","tag-porous-filter-medium-for-malaysia-aluminum-alloy","tag-porous-filter-medium-for-malaysia-aluminum-company","tag-porous-filter-medium-for-malaysia-aluminum-foil","tag-porous-filter-medium-for-malaysia-aluminum-ingot","tag-porous-filter-medium-for-malaysia-aluminum-manufacturer","tag-porous-filter-medium-for-malaysia-aluminum-smelter"],"yoast_head":"<!-- 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