{"id":318,"date":"2026-10-11T21:58:33","date_gmt":"2026-10-11T13:58:33","guid":{"rendered":"https:\/\/zirconia-ceramics.com\/?p=318"},"modified":"2026-10-11T22:01:23","modified_gmt":"2026-10-11T14:01:23","slug":"proc-se-vam-neustale-lamou-zirkonove-kulicky-a-ucpavaji-sito-v-jemnych-mlynech","status":"publish","type":"post","link":"https:\/\/zirconia-ceramics.com\/cs\/why-your-zirconia-balls-keep-breaking-and-plugging-the-screen-in-fine-grinding-mills\/","title":{"rendered":"Pro\u010d se v\u00e1m v jemn\u00fdch ml\u00fdnech neust\u00e1le l\u00e1mou zirkonov\u00e9 kuli\u010dky a ucp\u00e1vaj\u00ed s\u00edto"},"content":{"rendered":"<div>\n<div>\n<div>\n<div>\n<h1 dir=\"auto\"><strong>Pro\u010d se v\u00e1m v jemn\u00fdch ml\u00fdnech neust\u00e1le l\u00e1mou zirkonov\u00e9 kuli\u010dky a ucp\u00e1vaj\u00ed s\u00edto<\/strong><\/h1>\n<p dir=\"auto\">Str\u00e1vil jsem dvan\u00e1ct let v mokr\u00fdch ml\u00fdnech v okol\u00ed \u0160anghaje \u2013 v tov\u00e1rn\u00e1ch na pigmenty v Songjiangu, v z\u00e1vodech na elektronickou keramiku a na n\u011bkolika v\u00fdrobn\u00edch link\u00e1ch na materi\u00e1ly pro baterie v pr\u016fmyslov\u00fdch z\u00f3n\u00e1ch na okraji m\u011bsta. Nej\u010dast\u011bj\u0161\u00ed st\u00ed\u017enost ohledn\u011b zirkonov\u00fdch kuli\u010dek nen\u00ed to, \u017ee by se opot\u0159ebov\u00e1valy p\u0159\u00edli\u0161 rychle. Jde o to, \u017ee se kuli\u010dky l\u00e1mou, ucp\u00e1v\u00e1 se v\u00fdstupn\u00ed s\u00edto, ml\u00fdn se vyp\u00edn\u00e1 nebo se do produktu dost\u00e1vaj\u00ed hrub\u00e9 \u00falomky. V dev\u00edti p\u0159\u00edpadech z deseti se jedn\u00e1 o mlec\u00ed kuli\u010dky ze zirkonu stabilizovan\u00e9ho yttriem s velk\u00fdm rozptylem velikost\u00ed nebo s nespr\u00e1vn\u00fdm pr\u016fm\u011brem vzhledem k obvodov\u00e9 rychlosti a viskozit\u011b.<\/p>\n<p dir=\"auto\">Kuli\u010dky z Y-TZP jsou hust\u00e9, maj\u00ed hustotu p\u0159ibli\u017en\u011b 6,0 g\/cm\u00b3, a d\u00edky transformaci jsou velmi hou\u017eevnat\u00e9. Ve spr\u00e1vn\u011b napln\u011bn\u00e9m kuli\u010dkov\u00e9m ml\u00fdnu p\u0159en\u00e1\u0161ej\u00ed p\u0159i ka\u017ed\u00e9m n\u00e1razu v\u00edce energie ne\u017e oxid hlinit\u00fd a uvol\u0148uj\u00ed jen velmi m\u00e1lo materi\u00e1lu. M\u00edra opot\u0159eben\u00ed v laborato\u0159i u kvalitn\u00edch kuli\u010dek Y-TZP o velikosti 0,8\u20131,2 mm se p\u0159i standardn\u00edch testech s ka\u0161\u00ed \u010dasto pohybuje hluboko pod 0,01% za hodinu a kontaminace \u017eelezem nebo oxidem hlinit\u00fdm z\u016fst\u00e1v\u00e1 n\u00edzk\u00e1. Probl\u00e9m se objev\u00ed, kdy\u017e je rozlo\u017een\u00ed velikosti \u0161irok\u00e9 nebo jsou kuli\u010dky pro ml\u00fdn p\u0159\u00edli\u0161 velk\u00e9. V\u011bt\u0161\u00ed kuli\u010dky nesou v\u00edce kinetick\u00e9 energie. Pokud je viskozita suspenze vysok\u00e1 nebo nen\u00ed spr\u00e1vn\u011b napln\u011bno, nar\u00e1\u017eej\u00ed do s\u00edta nebo do sebe navz\u00e1jem tak siln\u011b, \u017ee se od\u0161t\u00edpnou. Jakmile se vytvo\u0159\u00ed od\u0161t\u00edpky, p\u016fsob\u00ed jako dal\u0161\u00ed abrazivn\u00ed l\u00e1tka, opot\u0159eben\u00ed se zrychluje a separ\u00e1tor se ucp\u00e1v\u00e1. Otev\u0159el jsem ml\u00fdny, kde polovina n\u00e1pln\u011b byla st\u00e1le kulat\u00e1 a druh\u00e1 polovina tvo\u0159ila zlomen\u00e9 kousky, kter\u00e9 tam nikdy nem\u011bly b\u00fdt.<\/p>\n<p dir=\"auto\">V lo\u0148sk\u00e9m roce jsem provedl zku\u0161ebn\u00ed provoz v tov\u00e1rn\u011b na pigmenty v Songjiangu. Tam se v horizont\u00e1ln\u00edm perlov\u00e9m ml\u00fdnu s m\u00e9dii o jmenovit\u00e9 velikosti 0,8 mm mlela suspenze organick\u00e9ho pigmentu s vysok\u00fdm obsahem pevn\u00fdch l\u00e1tek (p\u0159ibli\u017en\u011b 55\u201360%), p\u0159i\u010dem\u017e c\u00edlem bylo dos\u00e1hnout hodnoty D90 pod 5 \u00b5m. Zirkoniov\u00e9 kuli\u010dky, kter\u00e9 dosud pou\u017e\u00edvali, byly ozna\u010deny jako 0,6\u20131,0 mm Y-TZP, ale kdy\u017e jsme vzorek pros\u00e9vali, skute\u010dn\u00e9 rozmez\u00ed se pohybovalo od asi 0,4 mm do 1,4 mm, p\u0159i\u010dem\u017e byl patrn\u00fd pod\u00edl v\u011bt\u0161\u00edch zirkoniov\u00fdch kuli\u010dek. Po 40 hodin\u00e1ch stoupl diferen\u010dn\u00ed tlak na s\u00edto a ve v\u00fdstupu jsme na\u0161li rozbit\u00e9 kuli\u010dky a \u00falomky. Nam\u011b\u0159en\u00e9 opot\u0159eben\u00ed u cel\u00fdch kuli\u010dek, kter\u00e9 z\u016fstaly neporu\u0161en\u00e9, bylo st\u00e1le n\u00edzk\u00e9 \u2013 kolem 0,008% podle hmotnosti \u2013, ale m\u00edra l\u00e1mavosti zp\u016fsobila, \u017ee ml\u00fdn byl nepou\u017eiteln\u00fd. Laboratorn\u00ed zkou\u0161ky lomov\u00e9 pevnosti na v\u011bt\u0161\u00edch kuli\u010dk\u00e1ch z t\u00e9to \u0161ar\u017ee uk\u00e1zaly, \u017ee selhaly p\u0159i ni\u017e\u0161\u00edch zat\u00ed\u017een\u00edch ne\u017e referen\u010dn\u00ed t\u0159\u00edda s u\u017e\u0161\u00edm rozmez\u00edm 0,8 mm, kterou jsme m\u011bli k dispozici.<\/p>\n<p dir=\"auto\">P\u0159e\u0161li jsme na n\u00e1pl\u0148 Y-TZP s \u00fazk\u00fdm rozlo\u017een\u00edm velikosti \u010d\u00e1stic 0,8 mm, se stejnou hustotou a stejn\u00fdm nomin\u00e1ln\u00edm chemick\u00fdm slo\u017een\u00edm. Rychlost pln\u011bn\u00ed byla udr\u017eov\u00e1na podle doporu\u010den\u00ed v\u00fdrobce ml\u00fdna a sledovali jsme viskozitu tak, aby kuli\u010dky zirkonu z\u016fstaly v suspenzi bez shlukov\u00e1n\u00ed. Po dal\u0161\u00edch 40 hodin\u00e1ch z\u016fstalo s\u00edto \u010dist\u00e9, v produktu nebyly \u017e\u00e1dn\u00e9 m\u011b\u0159iteln\u00e9 \u00falomky a opot\u0159eben\u00ed kuli\u010dek \u010dinilo 0,006\u20130,0071 TP3T. Pr\u016fchodnost se zv\u00fd\u0161ila, proto\u017ee jsme mohli prodlou\u017eit intervaly mezi \u010di\u0161t\u011bn\u00edm. Kontroly kontaminace (ICP v suspenzi) se u zirkonia pohybovaly v n\u00edzk\u00e9m rozsahu ppm, co\u017e bylo pro tento pigment p\u0159ijateln\u00e9. Z\u00e1vod pot\u00e9 dodr\u017eoval p\u0159\u00edsn\u011bj\u0161\u00ed specifikaci velikosti \u010d\u00e1stic.<\/p>\n<p dir=\"auto\">Hustota a hou\u017eevnatost kvalitn\u00edch brusn\u00fdch kuli\u010dek ze zirkonu stabilizovan\u00e9ho yttriem p\u0159edstavuj\u00ed skute\u010dn\u00e9 v\u00fdhody pro jemn\u00e9 mlet\u00ed. Umo\u017e\u0148uj\u00ed pou\u017e\u00edvat men\u0161\u00ed brusn\u00e9 kuli\u010dky a p\u0159esto dod\u00e1vat energii do \u010d\u00e1stic, p\u0159i\u010dem\u017e m\u00edra opot\u0159eben\u00ed z\u016fst\u00e1v\u00e1 n\u00edzk\u00e1, tak\u017ee nen\u00ed nutn\u00e9 neust\u00e1le dopl\u0148ovat kovov\u00fd nebo keramick\u00fd prach. Tyto v\u00fdhody v\u0161ak miz\u00ed, pokud se kuli\u010dky rozbij\u00ed. \u0160irok\u00e9 rozlo\u017een\u00ed velikost\u00ed nebo kuli\u010dky, kter\u00e9 jsou p\u0159\u00edli\u0161 velk\u00e9 pro obvodovou rychlost, prom\u011bn\u00ed n\u00e1pl\u0148 v zdroj t\u0159\u00edsek nam\u00edsto brusn\u00e9ho n\u00e1stroje. Porovn\u00e1n\u00ed opot\u0159eben\u00ed zirkonov\u00fdch kuli\u010dek s hlin\u00edkov\u00fdmi vypad\u00e1 v technick\u00e9m listu skv\u011ble; v ml\u00fdnu v\u0161ak toto srovn\u00e1n\u00ed plat\u00ed pouze tehdy, kdy\u017e zirkon z\u016fstane neporu\u0161en\u00fd.<\/p>\n<p dir=\"auto\">N\u011bkolik v\u011bc\u00ed, kter\u00e9 kontroluji p\u0159\u00edmo na m\u00edst\u011b. Proosejte vzorek z ka\u017ed\u00e9 nov\u00e9 \u0161ar\u017ee \u2013 nespol\u00e9hejte se pouze na \u0161t\u00edtek na pytli. P\u0159izp\u016fsobte pr\u016fm\u011br zirkonov\u00fdch kuli\u010dek meze\u0159e separ\u00e1toru a po\u017eadovan\u00e9 jemnosti; v\u011bt\u0161\u00ed kuli\u010dky m\u00e1lokdy pomohou a \u010dasto zvy\u0161uj\u00ed jejich l\u00e1mavost. Udr\u017eujte obsah pevn\u00fdch l\u00e1tek a viskozitu v rozmez\u00ed, pro kter\u00e9 byl ml\u00fdn navr\u017een, aby se kuli\u010dky nehromadily ani nenar\u00e1\u017eely do s\u00edta. A pokud va\u0161e zirkoniov\u00e9 m\u00e9dium pro jemn\u00e9 mlet\u00ed ucp\u00e1v\u00e1 v\u00fdstup nebo se v produktu objevuj\u00ed \u00falomky, zm\u011b\u0159te velikostn\u00ed rozlo\u017een\u00ed a zkontrolujte, zda nejsou kuli\u010dky zlomen\u00e9, ne\u017e za\u010dnete vinit ka\u0161i nebo rychlost ml\u00fdna. Na lince na v\u00fdrobu pigment\u016f v Songjiangu p\u0159echod na \u00fazk\u00e9 kuli\u010dky o pr\u016fm\u011bru 0,8 mm zastavil l\u00e1m\u00e1n\u00ed a umo\u017enil, aby se n\u00edzk\u00e1 m\u00edra opot\u0159eben\u00ed materi\u00e1lu Y-TZP skute\u010dn\u011b projevila p\u0159i del\u0161\u00edch provozn\u00edch cyklech. V\u011bt\u0161ina ml\u00fdn\u016f, kter\u00e9 zde vid\u00edm, dosahuje stejn\u00e9ho v\u00fdsledku, jakmile p\u0159estanou pova\u017eovat v\u0161echny zirkonov\u00e9 kuli\u010dky za identick\u00e9 a za\u010dnou kontrolovat, jak\u00e1 velikost se ve skute\u010dnosti nach\u00e1z\u00ed v komo\u0159e.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div>&nbsp;<\/div>\n<\/div>\n<section><\/section>\n<div>&nbsp;<\/div>","protected":false},"excerpt":{"rendered":"<p>Why Your Zirconia Balls Keep Breaking and Plugging the Screen in Fine Grinding Mills I\u2019ve spent twelve years in wet mills around Shanghai\u2014pigment plants in Songjiang, electronic ceramic shops, and a couple of battery-material lines in the outer parks. The complaint that shows up most with zirconia balls is not that it wears too fast. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[21],"tags":[],"class_list":{"0":"post-318","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-knowledge","7":"czr-hentry"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/posts\/318"}],"collection":[{"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/comments?post=318"}],"version-history":[{"count":2,"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/posts\/318\/revisions"}],"predecessor-version":[{"id":320,"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/posts\/318\/revisions\/320"}],"wp:attachment":[{"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/media?parent=318"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/categories?post=318"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zirconia-ceramics.com\/cs\/wp-json\/wp\/v2\/tags?post=318"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}