{"id":2469,"date":"2024-12-26T11:31:30","date_gmt":"2024-12-26T03:31:30","guid":{"rendered":"https:\/\/www.powdergrindingmill.com\/?p=2469"},"modified":"2025-12-05T09:26:40","modified_gmt":"2025-12-05T01:26:40","slug":"ball-mill-loading-ratio-and-steel-ball-size-distribution","status":"publish","type":"post","link":"https:\/\/www.powdergrindingmill.com\/fr\/ball-mill-loading-ratio-and-steel-ball-size-distribution\/","title":{"rendered":"Taux de chargement du broyeur \u00e0 boulets et distribution de la taille des billes en acier"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"2469\" class=\"elementor elementor-2469\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0529221 e-flex e-con-boxed e-con e-parent\" data-id=\"0529221\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8722214 elementor-widget elementor-widget-text-editor\" data-id=\"8722214\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><\/p><p>Lors de l'utilisation de broyeurs \u00e0 boulets, les praticiens sans beaucoup d'exp\u00e9rience rencontrent souvent un probl\u00e8me : comment ajouter des billes d'acier au broyeur \u00e0 boulets en fonction de la proportion de la taille des billes d'acier ? Cela d\u00e9pend principalement des diff\u00e9rentes propri\u00e9t\u00e9s du broyeur \u00e0 boulets, telles que : la taille du diam\u00e8tre, la duret\u00e9 du minerai, la taille des particules du minerai dans le broyeur \u00e0 boulets, la duret\u00e9 des billes d'acier (qualit\u00e9), la vitesse du broyeur \u00e0 boulets et d'autres facteurs.<\/p><p><\/p><figure class=\"wp-block-image size-large\"><img decoding=\"async\" class=\"wp-image-7495\" src=\"https:\/\/www.epic-powder.com\/wp-content\/uploads\/2024\/12\/Steel-balls-of-ball-mill-1024x768.webp\" alt=\"\" \/><\/figure><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">I. Principes cl\u00e9s pour le dimensionnement des billes d'acier<\/h2><p><\/p><p><strong>Duret\u00e9 du mat\u00e9riau<\/strong>: Plus le mat\u00e9riau \u00e0 broyer est dur, plus les billes d'acier doivent \u00eatre grosses.<\/p><p><\/p><p><strong>Diam\u00e8tre du broyeur<\/strong>: Pour les broyeurs plus grands, la force d'impact plus importante n\u00e9cessite l'utilisation de billes d'acier plus petites.<\/p><p><\/p><p><strong>Type de partition<\/strong>: Lors de l'utilisation de partitions \u00e0 double compartiment, les billes d'acier doivent \u00eatre plus petites que celles utilis\u00e9es dans une partition \u00e0 compartiment unique avec la m\u00eame section de d\u00e9charge.<\/p><p><\/p><p><strong>R\u00e9partition des billes<\/strong>: En g\u00e9n\u00e9ral, une r\u00e9partition en quatre niveaux est utilis\u00e9e. Cela signifie que des billes plus grosses et plus petites sont utilis\u00e9es en quantit\u00e9s moindres, tandis que les billes de taille moyenne sont plus r\u00e9pandues. En d'autres termes, \u00ab moins aux deux extr\u00e9mit\u00e9s et plus au centre \u00bb.<\/p><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">II. Ratio des billes d'acier pour une haute efficacit\u00e9 de broyage<\/h2><p><\/p><p>Pour une efficacit\u00e9 de broyage optimale, le ratio suivant des billes d'acier est consid\u00e9r\u00e9 comme id\u00e9al. Cet \u00e9quilibre garantit le fonctionnement le plus \u00e9conomique du broyeur \u00e0 boulets :<\/p><p><\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Diam\u00e8tre des billes d'acier (mm)<\/strong><\/td><td><strong>\u03a6100<\/strong><\/td><td><strong>\u03a680<\/strong><\/td><td><strong>\u03a660<\/strong><\/td><td><strong>\u03a640<\/strong><\/td><td><strong>\u03a620<\/strong><\/td><\/tr><tr><td>Masse\/Charge totale (%)<\/td><td>7.50%<\/td><td>6.90%<\/td><td>33.50%<\/td><td>30.10%<\/td><td>22%<\/td><\/tr><\/tbody><\/table><\/figure><p><\/p><p class=\"has-large-font-size\">III. Comment ajouter des billes d'acier en fonction des proportions de taille<\/p><p><\/p><p>Lorsqu'un nouveau broyeur \u00e0 boulets est install\u00e9 pour la premi\u00e8re fois, il passe par une p\u00e9riode de rodage. Pendant cette p\u00e9riode, la charge initiale de billes d'acier doit repr\u00e9senter environ 80 % de la capacit\u00e9 maximale du broyeur. Les billes d'acier peuvent \u00eatre ajout\u00e9es proportionnellement \u00e0 leur taille (par exemple, \u03a6120mm, \u03a6100mm, \u03a680mm, \u03a660mm, \u03a640mm), en ajustant en fonction des besoins op\u00e9rationnels du broyeur.<\/p><p><\/p><p>Chargement et dimensionnement des billes d'acier dans les broyeurs \u00e0 boulets<\/p><p><\/p><p><strong>Quantit\u00e9 de chargement des billes d'acier<\/strong>: La charge totale de billes varie en fonction du mod\u00e8le de broyeur \u00e0 boulets. Par exemple, le broyeur \u00e0 boulets MQG1500\u00d73000 (avec une capacit\u00e9 de traitement de 100 \u00e0 150 tonnes) a une charge maximale de billes de 9,5 \u00e0 10 tonnes. Lors de l'ajout de billes d'acier pour la premi\u00e8re fois, la r\u00e9partition est g\u00e9n\u00e9ralement la suivante :<\/p><p><\/p><ul class=\"wp-block-list\"><li>Grosses billes (\u03a6120mm et \u03a6100mm) : 30 %-40 %<\/li><li>Billes moyennes (\u03a680mm) : 30 %-40 %<\/li><li>Petites billes (\u03a660mm et \u03a640mm) : 30 %<\/li><\/ul><p><\/p><p>Le poids des billes d'acier ajout\u00e9es doit \u00eatre bas\u00e9 sur leur qualit\u00e9. Les billes d'acier de qualit\u00e9 sup\u00e9rieure et r\u00e9sistantes \u00e0 l'usure sont pr\u00e9f\u00e9rables. La quantit\u00e9 id\u00e9ale de billes d'acier est de 0,8 kg par tonne de minerai pour les billes de bonne qualit\u00e9, tandis que les billes d'acier g\u00e9n\u00e9rales peuvent n\u00e9cessiter 1 \u00e0 1,2 kg par tonne de minerai.<\/p><p><\/p><p><strong>Rapport de taille des billes d'acier<\/strong>: La taille des billes d'acier ajout\u00e9es d\u00e9pend du diam\u00e8tre du broyeur \u00e0 boulets :<\/p><p><\/p><ul class=\"wp-block-list\"><li>Pour les broyeurs d'un diam\u00e8tre inf\u00e9rieur \u00e0 2500 mm, utilisez des billes de \u03a6100 mm, \u03a680 mm et \u03a660 mm.<\/li><li>Pour les broyeurs d'un diam\u00e8tre sup\u00e9rieur \u00e0 2500 mm, utilisez des billes de \u03a6120 mm, \u03a6100 mm et \u03a680 mm.<\/li><\/ul><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">IV. S\u00e9lection des milieux de broyage r\u00e9sistants \u00e0 l'usure (billes de broyage)<\/h2><p><\/p><p>En 1994, l'industrie des mat\u00e9riaux de construction en France a \u00e9tabli la norme JC\/T535-94 \u00ab Billes de broyage en fonte d'alliage de chrome pour l'industrie des mat\u00e9riaux de construction \u00bb. Celle-ci a ensuite \u00e9t\u00e9 affin\u00e9e avec la norme nationale GB\/T17445-1998 \u00ab Billes de broyage en fonte \u00bb, qui d\u00e9crit la composition chimique, les propri\u00e9t\u00e9s m\u00e9caniques, les sp\u00e9cifications et les m\u00e9thodes d'inspection des billes \u00e0 haute teneur en chrome, des billes \u00e0 teneur moyenne en chrome, des billes \u00e0 faible teneur en chrome et des billes en fonte ductile bainitique.<\/p><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">V. Propri\u00e9t\u00e9s des billes de broyage de haute qualit\u00e9<\/h2><p><\/p><p>Les billes de broyage de bonne qualit\u00e9 doivent pr\u00e9senter les propri\u00e9t\u00e9s cl\u00e9s suivantes :<\/p><p><\/p><p><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Wear\">Usure<\/a> R\u00e9sistance<\/strong>: Les billes de broyage doivent \u00eatre r\u00e9sistantes \u00e0 diverses formes d'usure, notamment la coupe, la d\u00e9formation et le pelage par fatigue. Pour l'usure par coupe, une duret\u00e9 \u00e9lev\u00e9e est essentielle. Pour la d\u00e9formation et l'usure par fatigue, les billes doivent avoir une r\u00e9sistance \u00e9lev\u00e9e \u00e0 la fatigue de d\u00e9formation, \u00e0 la fatigue de contact et \u00e0 la fatigue d'impact.<\/p><p><\/p><p><strong>T\u00e9nacit\u00e9 aux chocs<\/strong>: Les billes de broyage doivent avoir une excellente r\u00e9sistance \u00e0 l'impact, sans rupture lors de conditions d'impact r\u00e9p\u00e9t\u00e9.<\/p><p><\/p><p><strong>Ductilit\u00e9 \u00e0 la trempe<\/strong>: Les billes, en particulier les grandes (\u03a6100mm), doivent avoir une duret\u00e9 uniforme sur toute la surface pour \u00e9viter la perte de rondeur et garantir des performances constantes.<\/p><p><\/p><p><strong>Qualit\u00e9 m\u00e9tallurgique<\/strong>: Les billes de broyage de haute qualit\u00e9 doivent \u00eatre produites selon des normes sp\u00e9cifi\u00e9es, sans d\u00e9fauts de coul\u00e9e tels que l'inclusion de scories ou d'inclusion de sable.<\/p><p><\/p><p>Pour les chambres de broyage grossier, il est recommand\u00e9 d'utiliser des billes en chrome \u00e9lev\u00e9, tandis que pour le broyage fin, des billes en chrome faible peuvent \u00eatre utilis\u00e9es. En broyage humide, les billes en chrome faible ou en acier forg\u00e9 sont pr\u00e9f\u00e9r\u00e9es, car la r\u00e9sistance \u00e0 l'usure des billes en chrome \u00e9lev\u00e9 est moins efficace dans des conditions corrosives. Pour une r\u00e9sistance accrue \u00e0 l'usure, les billes moul\u00e9es en m\u00e9tal sont consid\u00e9r\u00e9es comme le meilleur choix.<\/p><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">VI. Optimisation du syst\u00e8me de chargement des billes<\/h2><p><\/p><p>Un syst\u00e8me de chargement des billes bien con\u00e7u est essentiel pour une op\u00e9ration efficace du broyeur. Il comprend plusieurs facteurs :<\/p><p><\/p><ul class=\"wp-block-list\"><li><strong>Qualit\u00e9 des billes en acier<\/strong>: Cela fait r\u00e9f\u00e9rence \u00e0 la densit\u00e9, \u00e0 la duret\u00e9 et \u00e0 la r\u00e9sistance \u00e0 l'usure des billes en acier.<\/li><li><strong>Taille des billes en acier<\/strong>: Les billes de diam\u00e8tre plus grand g\u00e9n\u00e8rent des forces d'impact plus importantes, tandis que les plus petites aident \u00e0 broyer des particules de minerai plus fines en augmentant le nombre d'impacts par unit\u00e9 de temps.<\/li><li><strong>Taux de remplissage des billes<\/strong>: Plus le diam\u00e8tre des billes est petit (lorsque le taux de remplissage est constant), plus le nombre de billes est \u00e9lev\u00e9 et donc plus les impacts sont fr\u00e9quents.<\/li><\/ul><p><\/p><p>Pour les minerais durs et grossiers, des billes de diam\u00e8tre plus grand et de haute densit\u00e9 sont n\u00e9cessaires pour un meilleur broyage. Cependant, pour les particules de minerai fines, des billes plus petites sont requises pour am\u00e9liorer l'efficacit\u00e9 du broyage. Actuellement, certains concentrateurs en France ajoutent des billes en acier de 100mm de diam\u00e8tre ind\u00e9pendamment de la taille du minerai, ce qui est inefficace et entra\u00eene un sur-broyage excessif ainsi qu'une augmentation de la consommation de billes en acier. Les billes plus grosses s'usent plus rapidement, ce qui entra\u00eene des co\u00fbts plus \u00e9lev\u00e9s.<\/p><p><\/p><h3 class=\"wp-block-heading\">Suggestions pour remplacer les billes en chrome faible et en acier forg\u00e9 par des billes en chrome \u00e9lev\u00e9<\/h3><p><\/p><p>: Alors que les industries poursuivent des avanc\u00e9es technologiques pour augmenter la productivit\u00e9 et r\u00e9duire les co\u00fbts, le remplacement des billes en chrome faible et en acier forg\u00e9 par des billes en chrome \u00e9lev\u00e9 devient une innovation essentielle.<\/p><p><\/p><p>Bien que les billes en chrome faible et en acier forg\u00e9 aient \u00e9t\u00e9 largement utilis\u00e9es dans des industries telles que la fabrication de ciment, les centrales thermiques et l'exploitation mini\u00e8re de minerai de fer, leur r\u00e9sistance \u00e0 l'usure est souvent insuffisante. Certains fabricants domestiques ont tent\u00e9 de remplacer ces billes par des billes moul\u00e9es en chrome \u00e9lev\u00e9. Cependant, ces efforts ont \u00e9t\u00e9 entrav\u00e9s par une mauvaise qualit\u00e9 du produit, un manque de r\u00e9sistance \u00e0 l'usure et des ruptures occasionnelles, ce qui les rend \u00e9conomiquement non viables.<\/p><p><\/p><p>Malgr\u00e9 ces d\u00e9fis, le remplacement des billes en chrome faible et en acier forg\u00e9 par des billes en chrome \u00e9lev\u00e9 repr\u00e9sente un saut majeur en avant, notamment dans les industries aux conditions de broyage exigeantes. Pour les entreprises visant la croissance, des am\u00e9liorations continues de la qualit\u00e9 du produit et une r\u00e9duction des co\u00fbts sont n\u00e9cessaires pour en r\u00e9colter tous les b\u00e9n\u00e9fices.<\/p><p><\/p><p>Sur de nombreux march\u00e9s \u00e9trangers, les billes moul\u00e9es en alliage de chrome \u00e9lev\u00e9 sont d\u00e9j\u00e0 la norme. Nos chercheurs ont d\u00e9velopp\u00e9 des billes en chrome \u00e0 haute duret\u00e9 et \u00e0 haute r\u00e9sistance \u00e0 l'usure, \u00e0 l'impact et \u00e0 la corrosion. En optimisant la composition chimique et les processus de traitement thermique, ces billes atteignent :<\/p><p><\/p><ul class=\"wp-block-list\"><li>Duret\u00e9 (HRC) sup\u00e9rieure \u00e0 56<\/li><li>Valeur d'impact \u22654J\/cm\u00b2<\/li><li>Durabilit\u00e9 \u00e0 la chute de plus de 10 000 fois<\/li><li>R\u00e9sistance \u00e0 l'usure plus de deux fois sup\u00e9rieure \u00e0 celle des billes en chrome faible standard<\/li><\/ul><p><\/p><p>Cette innovation met en \u00e9vidence la r\u00e9sistance \u00e0 l'usure sup\u00e9rieure des billes en chrome \u00e9lev\u00e9, les positionnant comme l'avenir du m\u00e9dia de broyage dans l'industrie.<\/p><p><\/p><h2 class=\"wp-block-heading has-large-font-size\">VII. Param\u00e8tres cl\u00e9s dans la m\u00e9thode de distribution en deux \u00e9tapes des billes<\/h2><p><\/p><p>Lors de l'utilisation de la m\u00e9thode de distribution en deux \u00e9tapes des billes dans les broyeurs, plusieurs param\u00e8tres importants doivent \u00eatre pris en compte :<\/p><p><\/p><p><strong>Grand diam\u00e8tre de bille<\/strong>: Semblable \u00e0 la distribution multi-\u00e9tapes, le choix du diam\u00e8tre de la grande bille d\u00e9pend de la taille des particules du mat\u00e9riau aliment\u00e9 dans le broyeur. Cependant, dans la m\u00e9thode en deux \u00e9tapes, le diam\u00e8tre est bas\u00e9 sur la taille repr\u00e9sentative des particules, c'est-\u00e0-dire la taille de particule constituant la plus grande proportion du mat\u00e9riau. En pratique, le diam\u00e8tre de la bille secondaire de la distribution multi-\u00e9tapes peut servir de r\u00e9f\u00e9rence. Par exemple, si le diam\u00e8tre maximal de la bille dans une distribution multi-\u00e9tapes est de 100 mm, une bille en acier de \u03a690 mm serait s\u00e9lectionn\u00e9e pour la distribution secondaire des billes.<\/p><p><\/p><p><strong>Ratio de billes<\/strong>: Le ratio entre les grandes et petites billes doit \u00eatre \u00e9quilibr\u00e9 pour garantir que l'ajout de petites billes ne compromet pas le taux de remplissage des plus grosses. En g\u00e9n\u00e9ral, les petites billes doivent repr\u00e9senter entre 31 % et 51 % du poids des grandes billes. En pratique, il est recommand\u00e9 de commencer par la limite inf\u00e9rieure (31 %) et d'ajuster en fonction des conditions de production sp\u00e9cifiques.<\/p><p><\/p><p><strong>Diam\u00e8tre des petites billes<\/strong>: La taille des petites billes d\u00e9pend de l'\u00e9cart entre les billes plus grosses, ce qui signifie qu'elle est li\u00e9e au diam\u00e8tre des grandes billes. Selon les directives de l'industrie, le diam\u00e8tre des petites billes doit \u00eatre compris entre 13 % et 33 % du diam\u00e8tre des grandes billes.<\/p><p><\/p><figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">https:\/\/www.youtube.com\/watch?v=SVjfmdFpEOc<\/div><\/figure><p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-53d817eb e-con-full e-flex e-con e-child\" data-id=\"53d817eb\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b271121 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"b271121\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span 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