{"id":3830,"date":"2026-07-01T17:00:57","date_gmt":"2026-07-01T09:00:57","guid":{"rendered":"https:\/\/www.nonmetallic-ore.com\/?p=3830"},"modified":"2026-07-01T17:01:35","modified_gmt":"2026-07-01T09:01:35","slug":"2-proven-methods-to-precisely-control-particle-size-in-light-calcium-carbonate","status":"publish","type":"post","link":"https:\/\/www.nonmetallic-ore.com\/fr\/2-proven-methods-to-precisely-control-particle-size-in-light-calcium-carbonate\/","title":{"rendered":"2 m\u00e9thodes \u00e9prouv\u00e9es pour contr\u00f4ler pr\u00e9cis\u00e9ment la taille des particules dans le carbonate de calcium l\u00e9ger"},"content":{"rendered":"<p>Lors de la carbonatation du carbonate de calcium l\u00e9ger (PCC), la nucl\u00e9ation des cristaux et l&#039;agr\u00e9gation des particules par collision sont limit\u00e9es par la cin\u00e9tique de r\u00e9action et les conditions du milieu, ce qui entra\u00eene souvent la formation de particules surdimensionn\u00e9es, une large distribution granulom\u00e9trique et une forte agglom\u00e9ration \u2013 des probl\u00e8mes qui limitent consid\u00e9rablement l&#039;application du PCC dans les industries \u00e0 haute valeur ajout\u00e9e. Cet article pr\u00e9sente deux m\u00e9thodes efficaces\u00a0:<strong>technologie de dispersion ultrasonique<\/strong> et <strong>modification des tensioactifs<\/strong>Il a \u00e9t\u00e9 prouv\u00e9 qu&#039;elles optimisent la distribution granulom\u00e9trique, r\u00e9duisent l&#039;agglom\u00e9ration et apportent des avantages \u00e9conomiques mesurables dans la production industrielle.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"471\" height=\"313\" src=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/02\/Calcium-Carbonate.webp\" alt=\"Carbonate de calcium\" class=\"wp-image-3710\" style=\"aspect-ratio:1.5048277506258194;width:835px;height:auto\" srcset=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/02\/Calcium-Carbonate.webp 471w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/02\/Calcium-Carbonate-300x199.webp 300w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/02\/Calcium-Carbonate-18x12.webp 18w\" sizes=\"(max-width: 471px) 100vw, 471px\" \/><figcaption class=\"wp-element-caption\">Carbonate de calcium<\/figcaption><\/figure>\n\n\n\n<p><a id=\"challenge\"><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0693e3\" class=\"has-inline-color\">1. Le d\u00e9fi du contr\u00f4le de la taille des particules dans le PCC<\/mark><\/h2>\n\n\n\n<p>Le carbonate de calcium pr\u00e9cipit\u00e9 (carbonate de calcium l\u00e9ger) est produit en calcinant le calcaire pour g\u00e9n\u00e9rer de la chaux (oxyde de calcium) et du dioxyde de carbone, en \u00e9teignant la chaux avec de l&#039;eau pour produire du lait d&#039;hydroxyde de calcium, puis en introduisant du dioxyde de carbone pour pr\u00e9cipiter le carbonate de calcium, suivi d&#039;une d\u00e9shydratation, d&#039;un s\u00e9chage et d&#039;un broyage.<\/p>\n\n\n\n<p>Au cours du processus de carbonatation, la nucl\u00e9ation des cristaux et l&#039;agr\u00e9gation des particules par collision sont limit\u00e9es par le contr\u00f4le de la r\u00e9action et les conditions du milieu, ce qui entra\u00eene fr\u00e9quemment\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>particules surdimensionn\u00e9es<\/strong> qui ne r\u00e9pondent pas aux sp\u00e9cifications en aval<\/li>\n\n\n\n<li><strong>distribution granulom\u00e9trique large<\/strong> avec une forte variabilit\u00e9<\/li>\n\n\n\n<li><strong>Agglom\u00e9ration s\u00e9v\u00e8re<\/strong> ce qui compromet les performances de dispersion<\/li>\n<\/ul>\n\n\n\n<p>Ces probl\u00e8mes ont limit\u00e9 l&#039;adoption g\u00e9n\u00e9ralis\u00e9e du PCC dans des applications exigeantes telles que l&#039;injection m\u00e9tallurgique, le compoundage du caoutchouc et les rev\u00eatements haute performance.<\/p>\n\n\n\n<p><a id=\"method1\"><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0693e3\" class=\"has-inline-color\">2. M\u00e9thode 1 : Technologie de dispersion ultrasonique<\/mark><\/h2>\n\n\n\n<p>Lors de la pr\u00e9paration du PCC, l&#039;\u00e9tape de carbonatation est cruciale pour le contr\u00f4le de la taille et de la morphologie des particules. Afin de limiter l&#039;agglom\u00e9ration durant les phases de nucl\u00e9ation et de croissance des particules de CaCO\u2083 lors de la r\u00e9action entre Ca(OH)\u2082 et CO\u2082, <strong>technologie de dispersion ultrasonique<\/strong> est introduit pour am\u00e9liorer l&#039;efficacit\u00e9 du m\u00e9lange microscopique du liquide r\u00e9actionnel.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"816\" height=\"403\" src=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Ultrasonic-transducer.webp\" alt=\"transducteur ultrasonique\" class=\"wp-image-3832\" style=\"aspect-ratio:2.024838051608747;width:848px;height:auto\" srcset=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Ultrasonic-transducer.webp 816w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Ultrasonic-transducer-300x148.webp 300w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Ultrasonic-transducer-768x379.webp 768w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Ultrasonic-transducer-18x9.webp 18w\" sizes=\"(max-width: 816px) 100vw, 816px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\">Param\u00e8tres d&#039;impl\u00e9mentation<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tre<\/th><th>Sp\u00e9cification<\/th><\/tr><\/thead><tbody><tr><td>Type de transducteur<\/td><td>Transducteur ultrasonique haute fr\u00e9quence r\u00e9sistant \u00e0 la corrosion (entra\u00eenement en c\u00e9ramique pi\u00e9zo\u00e9lectrique)<\/td><\/tr><tr><td>Fr\u00e9quence<\/td><td>25 kHz<\/td><\/tr><tr><td>Gamme de puissance<\/td><td>800 \u2013 1\u00a0200 W<\/td><\/tr><tr><td>densit\u00e9 d&#039;\u00e9nergie acoustique<\/td><td>Ajust\u00e9 dynamiquement en fonction du volume de liquide<\/td><\/tr><tr><td>D\u00e9lai de candidature<\/td><td>Les 10 \u00e0 15 premi\u00e8res minutes de r\u00e9action (d\u00e9clench\u00e9es lorsque la suspension de Ca(OH)\u2082 entre en contact avec le CO\u2082)<\/td><\/tr><tr><td>temp\u00e9rature du r\u00e9acteur<\/td><td>40 \u2013 45\u00b0C<\/td><\/tr><tr><td>Pression<\/td><td>\u2264 0,2 MPa<\/td><\/tr><tr><td>Refroidissement<\/td><td>Chemise d&#039;eau pour la r\u00e9gulation de la temp\u00e9rature des parois<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Source : Adapt\u00e9 de la documentation relative aux pratiques de l&#039;industrie.<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comment \u00e7a marche<\/h3>\n\n\n\n<p>Les ultrasons g\u00e9n\u00e8rent <strong>effets de cavitation<\/strong> en phase liquide, lequel :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Perturber les agr\u00e9gats naissants de CaCO\u2083 \u00e0 l&#039;\u00e9chelle microscopique<\/li>\n\n\n\n<li>Supprimer l&#039;agglom\u00e9ration par cristallisation secondaire<\/li>\n\n\n\n<li>Inhiber la croissance des particules<\/li>\n\n\n\n<li>Stabiliser la structure des particules<\/li>\n<\/ul>\n\n\n\n<p>Le champ ultrasonique est appliqu\u00e9 uniquement pendant la <strong>10 \u00e0 15 minutes initiales<\/strong> de la r\u00e9action \u2014 qui commence lorsque la suspension d\u2019hydroxyde de calcium entre en contact avec le CO\u2082 \u2014 afin d\u2019\u00e9viter une augmentation de la consommation d\u2019\u00e9nergie et de l\u2019usure des \u00e9quipements caus\u00e9e par le durcissement des particules dans les \u00e9tapes ult\u00e9rieures.<\/p>\n\n\n\n<p>La temp\u00e9rature du r\u00e9acteur est maintenue \u00e0 <strong>40\u201345\u00b0C<\/strong> et contr\u00f4l\u00e9 par pression <strong>inf\u00e9rieur \u00e0 0,2 MPa<\/strong> Pour assurer l&#039;activit\u00e9 de cavitation, une enveloppe d&#039;eau de refroidissement r\u00e9gule la temp\u00e9rature de la paroi afin d&#039;\u00e9viter les d\u00e9fauts cristallins dus \u00e0 une surchauffe localis\u00e9e.<\/p>\n\n\n\n<p>Les transducteurs pi\u00e9zo\u00e9lectriques en c\u00e9ramique offrent une stabilit\u00e9 \u00e0 haute fr\u00e9quence et une r\u00e9sistance \u00e0 la corrosion, ce qui les rend adapt\u00e9s aux conditions de r\u00e9action de carbonatation continue.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"800\" height=\"523\" src=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/09\/powder-coating-machine.webp\" alt=\"\" class=\"wp-image-3554\" style=\"aspect-ratio:1.5296731884450707;width:868px;height:auto\" srcset=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/09\/powder-coating-machine.webp 800w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/09\/powder-coating-machine-300x196.webp 300w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/09\/powder-coating-machine-768x502.webp 768w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/09\/powder-coating-machine-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p><a id=\"method2\"><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0693e3\" class=\"has-inline-color\">3. M\u00e9thode 2 : Modification du tensioactif<\/mark><\/h2>\n\n\n\n<p>Lors des phases de nucl\u00e9ation et de croissance des particules de PCC, <strong>modification des tensioactifs<\/strong> est introduit pour contr\u00f4ler l&#039;agr\u00e9gation des particules au niveau de l&#039;interface.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Formulation et mise en \u0153uvre<\/h3>\n\n\n\n<p><strong>Modificateur principal\u00a0:<\/strong> \u00e9ther alkylique de polyoxy\u00e9thyl\u00e8ne non ionique (OP-10)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pr\u00e9par\u00e9 comme un <strong>0.3%<\/strong> solution<\/li>\n\n\n\n<li>Pr\u00e9m\u00e9lang\u00e9 \u00e0 <strong>0.6%<\/strong> du volume total de liquide r\u00e9actionnel avant injection dans le r\u00e9acteur de carbonatation<\/li>\n<\/ul>\n\n\n\n<p><strong>Modificateur secondaire\u00a0:<\/strong> dod\u00e9cylbenz\u00e8nesulfonate de sodium anionique (SDBS)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ajout\u00e9 pour am\u00e9liorer l&#039;adsorption structurale<\/li>\n\n\n\n<li>Dosage total de tensioactif contr\u00f4l\u00e9 <strong>dans 1%<\/strong> du volume de liquide<\/li>\n<\/ul>\n\n\n\n<p><strong>Protocole d&#039;injection :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00e9clencher l&#039;\u00e9gouttement lorsque la fraction volumique de CO\u2082 d\u00e9passe <strong>50%<\/strong><\/li>\n\n\n\n<li>Utiliser une pompe p\u00e9ristaltique \u00e0 <strong>3 \u00e0 5 mL\/min<\/strong> pour pr\u00e9venir les pics de concentration localis\u00e9s<\/li>\n<\/ul>\n\n\n\n<p><strong>Conditions de m\u00e9lange :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Temps de m\u00e9lange prolong\u00e9\u00a0: <strong>10 minutes<\/strong><\/li>\n\n\n\n<li>Mode de faible cisaillement\u00a0: <strong>\u2264 80 tr\/min<\/strong><\/li>\n\n\n\n<li>Conception d&#039;h\u00e9lice \u00e0 pales repli\u00e9es multicouches pour un m\u00e9lange efficace sous faible charge de cisaillement<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">M\u00e9canisme d&#039;action<\/h3>\n\n\n\n<p>Les mol\u00e9cules OP-10 poss\u00e8dent une structure hydrophile-hydrophobe qui s&#039;adsorbe sur les surfaces cristallines de CaCO\u2083, formant une <strong>couche d&#039;encombrement st\u00e9rique<\/strong> qui emp\u00eache toute agr\u00e9gation suppl\u00e9mentaire.<\/p>\n\n\n\n<p>Le processus de modification repose sur <strong>adsorption physique et r\u00e9pulsion \u00e9lectrostatique<\/strong> L\u2019objectif est d\u2019obtenir un contr\u00f4le interfacial sans recourir \u00e0 des r\u00e9actions chimiques importantes. Ceci garantit une bonne compatibilit\u00e9 des proc\u00e9d\u00e9s et des mati\u00e8res premi\u00e8res.<\/p>\n\n\n\n<p>UN <strong>\u00e9tape de lavage \u00e0 l&#039;eau adoucie<\/strong> est appliqu\u00e9 en phase de post-traitement pour \u00e9liminer les r\u00e9sidus non absorb\u00e9s, \u00e9vitant ainsi tout impact sur les performances du produit.<\/p>\n\n\n\n<p><a id=\"results\"><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0693e3\" class=\"has-inline-color\">4. R\u00e9sultats : Am\u00e9lioration de la distribution granulom\u00e9trique et de la dispersion<\/mark><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 Modifications de la taille et de la distribution des particules<\/h3>\n\n\n\n<p>Apr\u00e8s la mise en \u0153uvre du proc\u00e9d\u00e9 am\u00e9lior\u00e9, la distribution granulom\u00e9trique du produit a montr\u00e9 une optimisation significative. Des tests ont \u00e9t\u00e9 r\u00e9alis\u00e9s \u00e0 l&#039;aide d&#039;un <strong>analyseur de taille de particules laser<\/strong> sur des \u00e9chantillons provenant de lots de production stables en fonctionnement continu.<\/p>\n\n\n\n<p><strong>Indicateurs cl\u00e9s\u00a0:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>D50<\/strong> (diam\u00e8tre m\u00e9dian) : taille des particules \u00e0 laquelle 50% de la distribution cumulative est atteint<\/li>\n\n\n\n<li><strong>D90<\/strong>: taille des particules \u00e0 laquelle 90% de la distribution cumulative est atteint<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>M\u00e9trique<\/th><th>Avant l&#039;am\u00e9lioration<\/th><th>Apr\u00e8s am\u00e9lioration<\/th><th>Changement<\/th><\/tr><\/thead><tbody><tr><td><strong>D50<\/strong><\/td><td>4,72 \u03bcm<\/td><td><strong>4,02 \u03bcm<\/strong><\/td><td>\u2193 14.8%<\/td><\/tr><tr><td><strong>D90<\/strong><\/td><td>8,97 \u03bcm<\/td><td><strong>6,20 \u03bcm<\/strong><\/td><td>\u2193 30,9%<\/td><\/tr><tr><td><strong>\u00c9cart type<\/strong><\/td><td>1,73 \u03bcm<\/td><td><strong>1,08 \u03bcm<\/strong><\/td><td>\u2193 37,6%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Source : Donn\u00e9es d&#039;essais issues de cycles de production en continu, telles que rapport\u00e9es dans la litt\u00e9rature industrielle.<\/em><\/p>\n\n\n\n<p>La courbe de distribution est pass\u00e9e d&#039;un profil large et plat avec une queue importante \u00e0 un <strong>structure concentr\u00e9e \u00e0 pic unique<\/strong> avec un maximum net, indiquant que les \u00e9tapes de nucl\u00e9ation et de croissance des particules sont devenues plus uniformes.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"896\" height=\"581\" src=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Particle-size-distribution-curve.webp\" alt=\"\" class=\"wp-image-3833\" style=\"width:866px;height:auto\" srcset=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Particle-size-distribution-curve.webp 896w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Particle-size-distribution-curve-300x195.webp 300w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Particle-size-distribution-curve-768x498.webp 768w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/Particle-size-distribution-curve-18x12.webp 18w\" sizes=\"(max-width: 896px) 100vw, 896px\" \/><\/figure>\n\n\n\n<p><strong>Principaux enseignements\u00a0:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La dispersion ultrasonique a am\u00e9lior\u00e9 l&#039;uniformit\u00e9 microscopique des noyaux primaires, limitant ainsi la formation de grosses particules.<\/li>\n\n\n\n<li>L&#039;adsorption du tensioactif a emp\u00each\u00e9 les tendances \u00e0 l&#039;agr\u00e9gation secondaire.<\/li>\n\n\n\n<li>La structure granulom\u00e9trique obtenue est plus stable et mieux adapt\u00e9e aux proc\u00e9d\u00e9s m\u00e9tallurgiques et autres proc\u00e9d\u00e9s en aval.<\/li>\n<\/ul>\n\n\n\n<p>La r\u00e9duction de l&#039;\u00e9cart type de 1,73 \u03bcm \u00e0 1,08 \u03bcm\u2014a <strong>diminution d&#039;environ 38%<\/strong> \u2014 refl\u00e8te une stabilit\u00e9 accrue dans le contr\u00f4le de la taille des particules, offrant une meilleure base particulaire pour les \u00e9tapes de traitement ult\u00e9rieures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.2 Am\u00e9lioration de l&#039;agglom\u00e9ration<\/h3>\n\n\n\n<p>Dans la production traditionnelle de PCC, une dispersion de nucl\u00e9ation insuffisante et une adsorption interfaciale incontr\u00f4l\u00e9e pendant la croissance cristalline entra\u00eenent une agglom\u00e9ration des particules, ce qui se traduit par une mauvaise dispersion, une faible surface sp\u00e9cifique et des performances en aval compromises.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"775\" height=\"444\" src=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/SEM-morphology-comparison.webp\" alt=\"\" class=\"wp-image-3834\" style=\"width:869px;height:auto\" srcset=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/SEM-morphology-comparison.webp 775w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/SEM-morphology-comparison-300x172.webp 300w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/SEM-morphology-comparison-768x440.webp 768w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/07\/SEM-morphology-comparison-18x10.webp 18w\" sizes=\"(max-width: 775px) 100vw, 775px\" \/><\/figure>\n\n\n\n<p><strong>Observation au MEB (microscopie \u00e9lectronique \u00e0 balayage) :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Avant l&#039;am\u00e9lioration :<\/strong> Les particules pr\u00e9sentaient des liaisons fortes, des surfaces rugueuses, de grandes masses agglom\u00e9r\u00e9es et des structures en amas irr\u00e9guli\u00e8res dans des zones localis\u00e9es.<\/li>\n\n\n\n<li><strong>Apr\u00e8s am\u00e9lioration :<\/strong> Les particules pr\u00e9sentaient des contours nets, des limites distinctes, des dimensions r\u00e9guli\u00e8res pour chaque particule et une morphologie bien dispers\u00e9e.<\/li>\n<\/ul>\n\n\n\n<p><strong>Test de vitesse de s\u00e9dimentation<\/strong> (comportement de stabilisation statique) :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tre<\/th><th>Avant l&#039;am\u00e9lioration<\/th><th>Apr\u00e8s am\u00e9lioration<\/th><\/tr><\/thead><tbody><tr><td>Vitesse de s\u00e9dimentation<\/td><td>0,56 cm\/min<\/td><td><strong>0,22 cm\/min<\/strong><\/td><\/tr><tr><td>Surface sp\u00e9cifique<\/td><td>4,2 m\u00b2\/g<\/td><td><strong>6,8 m\u00b2\/g<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Source : Mesures du taux de s\u00e9dimentation et de la surface sp\u00e9cifique BET \u00e0 partir d&#039;\u00e9chantillons de production.<\/em><\/p>\n\n\n\n<p>Le <strong>R\u00e9duction de 60,7%<\/strong> Une augmentation du taux de s\u00e9dimentation indique une stabilit\u00e9 nettement accrue des particules dans le milieu. <strong>Augmentation de 62%<\/strong> une surface sp\u00e9cifique plus \u00e9lev\u00e9e (de 4,2 \u00e0 6,8 m\u00b2\/g) d\u00e9montre une activit\u00e9 de surface plus \u00e9lev\u00e9e par unit\u00e9 de masse, confirmant indirectement un degr\u00e9 plus \u00e9lev\u00e9 d&#039;individualisation des particules.<\/p>\n\n\n\n<p><a id=\"economics\"><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0693e3\" class=\"has-inline-color\">5. Avantages \u00e9conomiques et applications industrielles<\/mark><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">5.1 Validation industrielle<\/h3>\n\n\n\n<p>Une usine de production de PCC a int\u00e9gr\u00e9 les technologies de dispersion ultrasonique et de modification de surface \u00e0 sa section de carbonatation existante. <strong>trois cycles de production cons\u00e9cutifs<\/strong>, toute la cha\u00eene de production a connu <strong>aucune fluctuation structurelle<\/strong>et la plage de variation des principaux indicateurs de qualit\u00e9 s&#039;est consid\u00e9rablement r\u00e9duite, d\u00e9montrant ainsi l&#039;aptitude au d\u00e9ploiement \u00e0 l&#039;\u00e9chelle du lot.<\/p>\n\n\n\n<p>Les produits finis en poudre expos\u00e9s <strong>Taille des particules uniforme et bonne dispersibilit\u00e9<\/strong> sur diff\u00e9rents lots, r\u00e9pondant aux normes de l&#039;industrie m\u00e9tallurgique en mati\u00e8re de contr\u00f4le de la taille des particules et de morphologie des particules.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Indicateur \u00e9conomique<\/td><td>Avant l&#039;am\u00e9lioration<\/td><td>Apr\u00e8s am\u00e9lioration<\/td><\/tr><tr><td>Indicateur \u00e9conomique<br>Avant l&#039;am\u00e9lioration<br>Apr\u00e8s am\u00e9lioration<br>Co\u00fbt de fabrication du produit \/ (RMB\/t)<\/td><td>486<\/td><td>438<\/td><\/tr><tr><td>Consommation \u00e9nerg\u00e9tique unitaire \/ (kWh\/t)<\/td><td>123<\/td><td>108<\/td><\/tr><tr><td>Nombre moyen de retouches par lot \/ (fois\/mois)<\/td><td>6<\/td><td>2<\/td><\/tr><tr><td>B\u00e9n\u00e9fice net mensuel \/ (10 000 RMB)<\/td><td>21.4<\/td><td>29.9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">5.2 Commentaires des utilisateurs<\/h3>\n\n\n\n<p>Les utilisateurs finaux ont indiqu\u00e9 que le nouveau produit a d\u00e9montr\u00e9\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>R\u00e9sistance au transport r\u00e9duite<\/strong> lors des proc\u00e9d\u00e9s d&#039;injection de fusion<\/li>\n\n\n\n<li><strong>Am\u00e9lioration de la constance d&#039;un lot \u00e0 l&#039;autre<\/strong> en composition<\/li>\n<\/ul>\n\n\n\n<p>Ces am\u00e9liorations de la qualit\u00e9 ont directement contribu\u00e9 \u00e0 une meilleure performance du processus.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5.3 \u00c9conomies de co\u00fbts<\/h3>\n\n\n\n<p>Avec une distribution granulom\u00e9trique am\u00e9lior\u00e9e et une agglom\u00e9ration r\u00e9duite\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>lots de retouche<\/strong> a diminu\u00e9 de mani\u00e8re significative<\/li>\n\n\n\n<li><strong>Erreurs de d\u00e9pistage<\/strong> ont \u00e9t\u00e9 r\u00e9duits<\/li>\n\n\n\n<li>Le fonctionnement de la cha\u00eene de production est devenu plus <strong>continu et stable<\/strong><\/li>\n\n\n\n<li>L&#039;am\u00e9lioration de la fluidit\u00e9 de la poudre a \u00e9t\u00e9 constat\u00e9e. <strong>remplissage d&#039;emballage<\/strong> efficacit\u00e9<\/li>\n\n\n\n<li>R\u00e9partition plus uniforme des forces mat\u00e9rielles <strong>r\u00e9duction des bris de sacs<\/strong> de la concentration des contraintes, r\u00e9duction des pertes de mat\u00e9riaux d&#039;emballage<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Indicateur de co\u00fbt<\/th><th>Avant l&#039;am\u00e9lioration<\/th><th>Apr\u00e8s am\u00e9lioration<\/th><th>\u00c9conomies<\/th><\/tr><\/thead><tbody><tr><td><strong>co\u00fbt de production par tonne<\/strong><\/td><td>486 RMB\/t<\/td><td><strong>438 RMB\/t<\/strong><\/td><td>48 RMB\/t (\u2193 9,9%)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Source\u00a0: Donn\u00e9es relatives aux co\u00fbts de production issues de la comptabilit\u00e9 interne de l\u2019\u00e9tablissement. Remarque\u00a0: Ces chiffres sont sp\u00e9cifiques au site et peuvent varier en fonction du co\u00fbt des mati\u00e8res premi\u00e8res, du prix de l\u2019\u00e9nergie et des conditions d\u2019exploitation locales.<\/em><\/p>\n\n\n\n<p>Les deux <strong>consommation d&#039;\u00e9nergie unitaire<\/strong> et <strong>d\u00e9chets mat\u00e9riels<\/strong> ont \u00e9t\u00e9 consid\u00e9rablement optimis\u00e9es.<\/p>\n\n\n\n<p><a id=\"conclusion\"><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0693e3\" class=\"has-inline-color\">6. Conclusion<\/mark><\/h2>\n\n\n\n<p>La combinaison de <strong>technologie de dispersion ultrasonique<\/strong> et <strong>modification des tensioactifs<\/strong> offre aux fabricants de PCC une approche pratique et \u00e9prouv\u00e9e pour\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Affiner la distribution granulom\u00e9trique<\/strong> (D90 r\u00e9duit de 8,97 \u03bcm \u00e0 6,20 \u03bcm)<\/li>\n\n\n\n<li><strong>R\u00e9duire l&#039;agglom\u00e9ration<\/strong> (taux de s\u00e9dimentation diminu\u00e9 de 60,7%)<\/li>\n\n\n\n<li><strong>Augmenter la surface sp\u00e9cifique<\/strong> (de 4,2 \u00e0 6,8 m\u00b2\/g)<\/li>\n\n\n\n<li><strong>co\u00fbts de production r\u00e9duits<\/strong> (\u00e9conomie d&#039;environ 48 RMB par tonne)<\/li>\n<\/ul>\n\n\n\n<p>Ces am\u00e9liorations se traduisent directement par de meilleures performances des produits, une satisfaction client accrue et une rentabilit\u00e9 op\u00e9rationnelle am\u00e9lior\u00e9e.<\/p>\n\n\n\n<p><em>Pour les fabricants de PCC qui cherchent \u00e0 mettre en \u0153uvre ces techniques avanc\u00e9es de contr\u00f4le de la taille des particules, <strong>Machines \u00e0 poudre EPIC<\/strong> EPIC propose des syst\u00e8mes de broyage, de classification et de modification de surface personnalis\u00e9s, con\u00e7us pour r\u00e9pondre \u00e0 des exigences de production sp\u00e9cifiques. Forte de plus de 20 ans d&#039;exp\u00e9rience dans l&#039;industrie des poudres ultrafines et pr\u00e9sente dans 160 pays, EPIC fournit des solutions compl\u00e8tes pour la transformation du carbonate de calcium \u00e0 haute valeur ajout\u00e9e.<\/em><\/p>\n\n\n\n<p><em><a href=\"https:\/\/www.nonmetallic-ore.com\/fr\/contact\/\">Contact<\/a> Nos experts vous expliqueront comment nous pouvons vous aider \u00e0 optimiser votre processus de production de PCC.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"562\" src=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/01\/Epic-Powder-Company-1024x562.webp\" alt=\"Epic Powder Company\" class=\"wp-image-3681\" style=\"width:872px;height:auto\" srcset=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/01\/Epic-Powder-Company-1024x562.webp 1024w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/01\/Epic-Powder-Company-300x165.webp 300w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/01\/Epic-Powder-Company-768x421.webp 768w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/01\/Epic-Powder-Company-1536x843.webp 1536w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/01\/Epic-Powder-Company-18x10.webp 18w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2026\/01\/Epic-Powder-Company.webp 1697w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Epic Powder Company<\/figcaption><\/figure>\n\n\n\n<p><strong>Note concernant la source des donn\u00e9es\u00a0:<\/strong> Les donn\u00e9es techniques, les r\u00e9sultats d&#039;essais et les indicateurs de production pr\u00e9sent\u00e9s dans cet article proviennent de la documentation industrielle publi\u00e9e par \u00ab\u00a0Powder Technology Network\u00a0\u00bb. Les donn\u00e9es num\u00e9riques sp\u00e9cifiques, notamment le D50, le D90, l&#039;\u00e9cart type, la vitesse de s\u00e9dimentation, la surface sp\u00e9cifique et les co\u00fbts de production, sont issues de l&#039;\u00e9tude de cas d&#039;une installation de production de PCC pr\u00e9sent\u00e9e dans l&#039;article source. Les donn\u00e9es relatives aux co\u00fbts de production (486 RMB\/t et 438 RMB\/t) sont sp\u00e9cifiques \u00e0 l&#039;installation \u00e9tudi\u00e9e et peuvent varier en fonction du co\u00fbt des mati\u00e8res premi\u00e8res, du prix de l&#039;\u00e9nergie et des conditions d&#039;exploitation locales.<\/p>\n\n\n\n<figure class=\"wp-block-embed aligncenter 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=\"Broyeur \u00e0 trois rouleaux pour la modification de la surface de la poudre de carbonate de calcium\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/cNzgynoeNI8?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<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#cf2e2e\" class=\"has-inline-color\">Poudre \u00e9pique<\/mark><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.nonmetallic-ore.com\/fr\/machines\/\">Poudre \u00e9pique<\/a>Forts de plus de 20 ans d&#039;exp\u00e9rience dans l&#039;industrie des poudres ultrafines, nous contribuons activement \u00e0 son d\u00e9veloppement futur, en nous concentrant sur les proc\u00e9d\u00e9s de concassage, de broyage, de classification et de modification. Contactez-nous pour une consultation gratuite et des solutions personnalis\u00e9es\u00a0! Notre \u00e9quipe d&#039;experts s&#039;engage \u00e0 vous fournir des produits et services de haute qualit\u00e9 afin d&#039;optimiser la valeur de votre transformation des poudres.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" width=\"602\" height=\"602\" src=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/11\/Mr-Wang.webp\" alt=\"Monsieur Wang\" class=\"wp-image-3612\" style=\"width:150px;height:150px\" srcset=\"https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/11\/Mr-Wang.webp 602w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/11\/Mr-Wang-300x300.webp 300w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/11\/Mr-Wang-150x150.webp 150w, https:\/\/www.nonmetallic-ore.com\/wp-content\/uploads\/2025\/11\/Mr-Wang-12x12.webp 12w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote has-text-align-center is-style-large is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size\">Merci de votre lecture. J&#039;esp\u00e8re que cet article vous sera utile. N&#039;h\u00e9sitez pas \u00e0 laisser un commentaire ci-dessous. Vous pouvez \u00e9galement contacter le service client en ligne d&#039;EPIC Powder. <strong>Zelda<\/strong> pour toute autre question.<\/p>\n<cite>                                                                                                                                           \u2014 <strong><a href=\"https:\/\/www.linkedin.com\/showcase\/107512344\">Jason Wang<\/a><\/strong>, Ing\u00e9nieur<\/cite><\/blockquote>\n\n\n\n<div class=\"wp-block-contact-form-7-contact-form-selector\">\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f16-o1\" lang=\"zh-CN\" dir=\"ltr\" data-wpcf7-id=\"16\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/fr\/wp-json\/wp\/v2\/posts\/3830#wpcf7-f16-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"\u7559\u8a00\u8868\u5355\" novalidate=\"novalidate\" data-status=\"init\" data-trp-original-action=\"\/fr\/wp-json\/wp\/v2\/posts\/3830#wpcf7-f16-o1\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"16\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.1.4\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"zh_CN\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f16-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<\/fieldset>\n<div class=\"keen-form\">\n\t<div class=\"one-half\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre nom*\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half last\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre email*\" value=\"\" type=\"email\" name=\"your-email\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"pnone\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-tel\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre Pnone ou Whatsapp*\" value=\"\" type=\"tel\" name=\"pnone\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half last\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-subject\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"Votre entreprise\" value=\"\" type=\"text\" name=\"your-subject\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-message\"><textarea cols=\"40\" rows=\"3\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea\" aria-invalid=\"false\" placeholder=\"Votre message\" name=\"your-message\"><\/textarea><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><span class=\"wpcf7-form-control-wrap kc_captcha\" data-name=\"kc_captcha\"><span class=\"wpcf7-form-control wpcf7-radio\"><span class=\"captcha-image\" ><span class=\"cf7ic_instructions\">Veuillez prouver que vous \u00eates humain en s\u00e9lectionnant<span> cl\u00e9<\/span>\u3002<\/span><label><input aria-label=\"1\" type=\"radio\" name=\"kc_captcha\" value=\"bot\" \/><svg aria-hidden=\"true\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 576 512\"><path fill=\"currentColor\" d=\"M415 24c-53 0-103 42-127 65-24-23-74-65-127-65C70 24 16 77 16 166c0 72 67 133 69 135l187 181c9 8 23 8 32 0l187-180c2-3 69-64 69-136 0-89-54-142-145-142z\"\/><\/svg><\/label><label><input aria-label=\"2\" type=\"radio\" name=\"kc_captcha\" value=\"bot\" \/><svg aria-hidden=\"true\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\"><path fill=\"currentColor\" d=\"M192 384h192c53 0 96-43 96-96h32a128 128 0 000-256H120c-13 0-24 11-24 24v232c0 53 43 96 96 96zM512 96a64 64 0 010 128h-32V96h32zm48 384H48c-47 0-61-64-36-64h584c25 0 11 64-36 64z\"\/><\/svg><\/label><label><input aria-label=\"3\" type=\"radio\" name=\"kc_captcha\" value=\"kc_human\" \/><svg aria-hidden=\"true\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\"><path fill=\"currentColor\" d=\"M512 176a176 176 0 01-209 173l-24 27a24 24 0 01-18 8h-37v40c0 13-11 24-24 24h-40v40c0 13-11 24-24 24H24c-13 0-24-11-24-24v-78c0-6 3-13 7-17l162-162a176 176 0 11343-55zm-176-48a48 48 0 1096 0 48 48 0 00-96 0z\"\/><\/svg><\/label>\r\n    <\/span>\r\n    <span style=\"display:none\">\r\n        <input type=\"text\" name=\"kc_honeypot\">\r\n    <\/span><\/span><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><input class=\"wpcf7-form-control wpcf7-submit has-spinner\" type=\"submit\" value=\"Soumettre\" \/>\n\t\t<\/p>\n\t<\/div>\n<\/div>\n<style>\n.keen-form div{margin-bottom:5px;}\n.keen-form div p{margin-bottom:0px !important;}\n.one-half,.one-third {\n position: relative;\n margin-right: 4%;\n float: left;\n z-index: 99;\n}\n.one-half { width: 48%; }\n.one-third { width: 30.66%; }\n.last {\n margin-right: 0 !important;\n clear: right;\n}\n@media only screen and (max-width: 767px) {\n .one-half, .one-third {\n width: 100%;\n margin-right: 0;\n }\n}\n<\/style><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<input type=\"hidden\" name=\"trp-form-language\" value=\"fr\"\/><\/form>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Lors de la carbonatation du carbonate de calcium l\u00e9ger (PCC), la nucl\u00e9ation des cristaux et l&#039;agr\u00e9gation des particules par collision sont limit\u00e9es par la cin\u00e9tique de r\u00e9action et les conditions du milieu, ce qui entra\u00eene souvent la formation de particules surdimensionn\u00e9es, une large distribution granulom\u00e9trique et une forte agglom\u00e9ration \u2013 des probl\u00e8mes qui limitent consid\u00e9rablement l&#039;application du PCC dans les industries \u00e0 haute valeur ajout\u00e9e. Cet article pr\u00e9sente deux m\u00e9thodes efficaces\u00a0: la dispersion ultrasonique et la modification par tensioactifs. [\u2026]<\/p>","protected":false},"author":1,"featured_media":3710,"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":"disabled","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":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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