{"id":14860,"date":"2024-12-13T09:19:54","date_gmt":"2024-12-13T09:19:54","guid":{"rendered":"https:\/\/www.epicmicron.com\/?p=14860"},"modified":"2024-12-17T07:11:10","modified_gmt":"2024-12-17T07:11:10","slug":"analysis-of-the-heavy-calcium-powder-and-changes-in-d100","status":"publish","type":"post","link":"https:\/\/www.epicmicron.com\/fr\/analysis-of-the-heavy-calcium-powder-and-changes-in-d100\/","title":{"rendered":"Analyse de la poudre de calcium lourd et \u00e9volution du D100"},"content":{"rendered":"<p>Les chercheurs testent la taille des particules \u00e0 l&#039;aide d&#039;un analyseur de taille de particules laser apr\u00e8s une seule classification de poudre de calcium lourde. \u00c9tonnamment, la taille des particules fines a chang\u00e9 et la valeur D100 a augment\u00e9. Apr\u00e8s une deuxi\u00e8me classification, la valeur D100 a de nouveau augment\u00e9, ce qui a entra\u00een\u00e9 une confusion suppl\u00e9mentaire.<\/p>\n\n\n\n<p>Au d\u00e9part, on soup\u00e7onnait que d&#039;autres poudres avaient pu se m\u00e9langer \u00e0 la poudre de calcium. Cependant, apr\u00e8s avoir \u00e9cart\u00e9 cette possibilit\u00e9, le probl\u00e8me a persist\u00e9. Concentrons-nous donc sur le processus de classification et les m\u00e9thodes de d\u00e9tection pour comprendre pourquoi cela se produit.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"900\" height=\"392\" src=\"https:\/\/www.epicmicron.com\/wp-content\/uploads\/2024\/12\/Calcium-carbonate-powder-of-different-particle-sizes.webp\" alt=\"Poudre de carbonate de calcium de diff\u00e9rentes tailles de particules\" class=\"wp-image-14861\" srcset=\"https:\/\/www.epicmicron.com\/wp-content\/uploads\/2024\/12\/Calcium-carbonate-powder-of-different-particle-sizes.webp 900w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2024\/12\/Calcium-carbonate-powder-of-different-particle-sizes-300x131.webp 300w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2024\/12\/Calcium-carbonate-powder-of-different-particle-sizes-768x335.webp 768w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2024\/12\/Calcium-carbonate-powder-of-different-particle-sizes-18x8.webp 18w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2024\/12\/Calcium-carbonate-powder-of-different-particle-sizes-600x261.webp 600w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><figcaption class=\"wp-element-caption\">Poudre de carbonate de calcium de diff\u00e9rentes tailles de particules<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Sauf <a href=\"https:\/\/en.wikipedia.org\/wiki\/Contamination\">Contamination<\/a>: Focus sur la classification et la d\u00e9tection<\/h2>\n\n\n\n<p>Il est peu probable qu&#039;il se m\u00e9lange avec d&#039;autres poudres, examinons donc le processus de classification et les m\u00e9thodes de d\u00e9tection. Voici une analyse simple pour plus de clart\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c9quipement de broyage et fonction de classificateur<\/h2>\n\n\n\n<p>Le <a href=\"https:\/\/www.epicmicron.com\/fr\">\u00e9quipement de broyage<\/a> Le classificateur souffle des particules de poudre dans le classificateur par un flux d&#039;air ascendant. Ce classificateur, ou classificateur \u00e0 flux d&#039;air, utilise la force centrifuge m\u00e9canique pour acc\u00e9l\u00e9rer les particules de poudre dans le flux d&#039;air. Les particules plus grosses sont projet\u00e9es vers l&#039;ext\u00e9rieur, heurtent la paroi en fer et perdent de l&#039;\u00e9nergie cin\u00e9tique, ce qui les fait retomber. Pendant ce temps, les particules plus petites restent au centre du flux d&#039;air et sont transport\u00e9es vers le d\u00e9poussi\u00e9reur ou d&#039;autres \u00e9tapes de traitement ult\u00e9rieures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Analyseur de taille de particules au laser<\/h3>\n\n\n\n<p>L&#039;analyseur de taille de particules laser teste la taille des particules en pla\u00e7ant des particules de poudre en phase dilu\u00e9e dans une solution aqueuse. L&#039;analyseur utilise des sources lumineuses simples ou doubles de longueurs d&#039;onde sp\u00e9cifiques pour induire des interf\u00e9rences ou une diffraction. Il s&#039;appuie sur des mod\u00e8les tels que <strong>MIE<\/strong> ou <strong>Fraunhofer<\/strong> pour simuler l&#039;interaction de la lumi\u00e8re avec les particules. Ensuite, il calcule des donn\u00e9es statistiques sur le diam\u00e8tre volumique.<\/p>\n\n\n\n<p><strong>Mod\u00e8le MIE<\/strong>: Principalement utilis\u00e9 pour les particules de taille nanom\u00e9trique.<\/p>\n\n\n\n<p><strong>Mod\u00e8le de Fraunhofer (mod\u00e8le F)<\/strong>:Mieux adapt\u00e9 aux particules de plus grande taille.<\/p>\n\n\n\n<p>Le principe derri\u00e8re ces mod\u00e8les est complexe, mais chaque mod\u00e8le est adapt\u00e9 \u00e0 diff\u00e9rentes gammes de tailles de particules pour notre analyse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi le D100 continue d\u2019augmenter ?<\/h2>\n\n\n\n<p>Lorsqu&#039;une poudre subit plusieurs classifications, il peut en r\u00e9sulter une augmentation de la valeur D100 (la taille des particules \u00e0 laquelle 100% du mat\u00e9riau est plus petite) \u00e0 chaque classification. Cela est souvent d\u00fb aux raisons suivantes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Redistribution des particules<\/strong>:Apr\u00e8s chaque classification, des particules plus fines peuvent \u00eatre \u00e9limin\u00e9es, laissant derri\u00e8re elles une plus grande proportion de particules plus grossi\u00e8res. Le r\u00e9sultat est un changement global dans la distribution granulom\u00e9trique, conduisant \u00e0 une augmentation de la valeur D100.<\/li>\n\n\n\n<li><strong>Efficacit\u00e9 du classificateur<\/strong>:L&#039;efficacit\u00e9 du classificateur peut varier, notamment lors de la manipulation de poudres pr\u00e9sentant une large distribution granulom\u00e9trique. Une classification incoh\u00e9rente peut permettre \u00e0 des particules plus fines de r\u00e9int\u00e9grer le syst\u00e8me, provoquant des modifications dans les r\u00e9sultats de granulom\u00e9trie.<\/li>\n\n\n\n<li><strong>Variabilit\u00e9 de la m\u00e9thode de mesure<\/strong>:Les m\u00e9thodes d&#039;analyse de la taille des particules par laser, notamment les mod\u00e8les MIE et Fraunhofer, peuvent introduire des \u00e9carts de mesure en fonction de la nature des particules et de la longueur d&#039;onde utilis\u00e9e pour la d\u00e9tection.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Le r\u00f4le des D97, D98 et D100 dans l&#039;analyse granulom\u00e9trique au laser<\/h3>\n\n\n\n<p>Dans le domaine de l\u2019analyse de la taille des particules, l\u2019accent est mis en grande partie sur <strong>D97<\/strong>\u00a0ou <strong>D98<\/strong>\u00a0valeurs, qui repr\u00e9sentent les tailles de particules coup\u00e9es sup\u00e9rieures. Bien que les chercheurs discutent rarement <strong>D100<\/strong>. Cependant, si vous examinez attentivement les r\u00e9sultats des tests des analyseurs de taille de particules laser, qu&#039;ils proviennent de Malvern, de Bexter ou d&#039;autres instruments, vous remarquerez que <strong>D97<\/strong>\u00a0et <strong>D100<\/strong>\u00a0les valeurs peuvent diff\u00e9rer consid\u00e9rablement. Cette diff\u00e9rence, souvent comprise entre 0,02% et 0,04%, met en \u00e9vidence la complexit\u00e9 de la mesure de la taille des particules.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comprendre la valeur<\/h3>\n\n\n\n<p>Le <strong>D100<\/strong>&nbsp;La valeur repr\u00e9sente la taille des particules \u00e0 laquelle 100% de l&#039;\u00e9chantillon est plus petite. Bien que cette valeur puisse sembler cruciale, elle est souvent \u00e9clips\u00e9e par la <strong>D97<\/strong>&nbsp;et <strong>D98<\/strong>&nbsp;mesures, qui se concentrent sur le point de coupure sup\u00e9rieur. L&#039;\u00e9cart entre les valeurs D97 et D100 n&#039;est pas n\u00e9cessairement d\u00fb \u00e0 des erreurs dans le processus de mesure, mais plut\u00f4t \u00e0 la <strong>nature indirecte<\/strong>&nbsp;de l&#039;analyse granulom\u00e9trique par laser.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Analyseur de taille de particules au laser : m\u00e9thode de d\u00e9tection indirecte<\/h3>\n\n\n\n<p>Les analyseurs de taille de particules laser, tels que ceux de Malvern ou de Bexter, utilisent <strong>ing\u00e9rence<\/strong>&nbsp;ou <strong>diffraction<\/strong>&nbsp;mod\u00e8les pour estimer la taille des particules de poudre. Ces analyseurs appliquent des mod\u00e8les math\u00e9matiques sp\u00e9cifiques, tels que <strong>MIE<\/strong>&nbsp;ou <strong>Fraunhofer<\/strong>&nbsp;mod\u00e8le, pour calculer le diam\u00e8tre volumique en fonction des ondes d&#039;interf\u00e9rence cr\u00e9\u00e9es lorsque la lumi\u00e8re interagit avec les particules de poudre.<\/p>\n\n\n\n<p>Cependant, ce processus est <strong>indirect<\/strong>\u2014les mod\u00e8les reposent sur des calculs statistiques plut\u00f4t que sur des mesures directes. Par cons\u00e9quent, des inexactitudes peuvent survenir, en particulier dans les <strong>extr\u00eames<\/strong>\u00a0de la gamme de tailles de particules, telles que les plus petites (0%) et les plus grandes (100%). Cette nature statistique signifie que l&#039;analyse peut exclure statistiquement certaines grosses particules, qui pourraient \u00eatre trop rares ou trop grandes par rapport \u00e0 la longueur d&#039;onde de la lumi\u00e8re.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Inexactitudes statistiques dans les grosses et petites particules<\/h3>\n\n\n\n<p>La pr\u00e9cision des analyseurs de taille de particules laser est souvent limit\u00e9e par la <strong>seuils statistiques<\/strong>&nbsp;fix\u00e9 par les mod\u00e8les. Lorsqu&#039;il y a un <strong>petit nombre<\/strong>&nbsp;de particules tr\u00e8s fines, elles peuvent \u00eatre n\u00e9glig\u00e9es en raison de limitations d&#039;\u00e9chantillonnage statistique. Inversement, \u00e0 mesure que le nombre de particules plus grossi\u00e8res augmente, elles p\u00e9n\u00e8trent dans le pool d&#039;\u00e9chantillons et contribuent \u00e0 la distribution granulom\u00e9trique observ\u00e9e. Cela conduit \u00e0 <strong>D100<\/strong>&nbsp;les valeurs \u00e9tant influenc\u00e9es par ces seuils statistiques, qui sont intrins\u00e8quement li\u00e9s \u00e0 la reproductibilit\u00e9 et aux limites de d\u00e9tection de l&#039;analyseur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Les analyseurs de taille de particules laser fournissent des donn\u00e9es statistiques pr\u00e9cieuses gr\u00e2ce \u00e0 une m\u00e9thode de mesure indirecte. Ils offrent une reproductibilit\u00e9 dans certaines plages de tailles de particules et sont tr\u00e8s utiles pour guider les processus de production et d&#039;application. La poudre est compos\u00e9e d&#039;une large gamme de tailles de particules, et l&#039;analyse de ces particules n\u00e9cessite de comprendre \u00e0 la fois les extr\u00eames fins et grossiers. Les m\u00e9thodes de mesure directe, telles que la microscopie \u00e9lectronique, offrent une approche visuelle plus pr\u00e9cise de l&#039;observation de la taille des particules, mais n\u00e9cessitent souvent plus de ressources.<\/p>\n\n\n\n<p>Pour comprendre les raisons des multiples classifications de la poudre de calcium lourde et les variations de D100, il faut prendre en compte \u00e0 la fois le processus de classification et les limites des m\u00e9thodes de d\u00e9tection. Les multiples cycles de classification et le comportement du classificateur, ainsi que les mod\u00e8les utilis\u00e9s par l&#039;analyseur de taille de particules laser, jouent tous un r\u00f4le dans les variations observ\u00e9es de la distribution granulom\u00e9trique. En optimisant le processus de classification et en garantissant des m\u00e9thodes de d\u00e9tection coh\u00e9rentes, le probl\u00e8me de l&#039;augmentation des valeurs de D100 peut diminuer.<\/p>\n\n\n\n<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\">\n<iframe title=\"Syst\u00e8me de broyeur \u00e0 boulets et de classificateur pour carbonate de calcium-EPIC\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/SVjfmdFpEOc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Les chercheurs testent la taille des particules \u00e0 l&#039;aide d&#039;un analyseur de taille de particules laser apr\u00e8s une seule classification de poudre de calcium lourde. \u00c9tonnamment, la taille des particules fines a chang\u00e9 et le D100 [\u2026]<\/p>","protected":false},"author":2,"featured_media":14861,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[42],"tags":[],"class_list":["post-14860","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Analysis of the Heavy Calcium Powder and Changes in D100 - Jet Mill Equipment Manufacturer<\/title>\n<meta name=\"description\" content=\"The fine particle size was found to change, and the D100 value increased. 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