Po v\u00edce ne\u017e dvaceti letech, kdy jsem specifikoval mlec\u00ed m\u00e9dia pro keramick\u00e9 provozy, zpracovatele miner\u00e1l\u016f a speci\u00e1ln\u00ed chemick\u00e9 provozy, jsem se nau\u010dil, \u017ee nejlevn\u011bj\u0161\u00ed m\u00e9dia se m\u00e1lokdy uk\u00e1\u017e\u00ed jako nejhospod\u00e1rn\u011bj\u0161\u00ed. Hlin\u00edkov\u00e9 mlec\u00ed kuli\u010dky se nach\u00e1zej\u00ed v u\u017eite\u010dn\u00e9m st\u0159edn\u00edm p\u00e1smu, kde se v\u00fdkon, kontrola zne\u010di\u0161t\u011bn\u00ed a celkov\u00e9 n\u00e1klady na vlastnictv\u00ed skute\u010dn\u011b shoduj\u00ed. Nejsou nejtvrd\u0161\u00ed ani nejleh\u010d\u00ed variantou na trhu, ale ve v\u011bt\u0161in\u011b p\u0159\u00edpad\u016f mokr\u00e9ho i such\u00e9ho mlet\u00ed, na kter\u00fdch jsem se pod\u00edlel, poskytuj\u00ed nejp\u0159edv\u00eddateln\u011bj\u0161\u00ed v\u00fdsledky v pr\u016fb\u011bhu dlouh\u00fdch kampan\u00ed.<\/p>\n
Tyto kuli\u010dky jsou vyrobeny z oxidu hlinit\u00e9ho, obvykle v rozsahu 92 % a\u017e 99 % Al\u2082O\u2083. \u010c\u00edm vy\u0161\u0161\u00ed je obsah oxidu hlinit\u00e9ho, t\u00edm vy\u0161\u0161\u00ed je odolnost proti opot\u0159eben\u00ed a t\u00edm ni\u017e\u0161\u00ed je riziko vn\u00e1\u0161en\u00ed ne\u010distot. V\u00fdroba za\u010d\u00edn\u00e1 pe\u010dliv\u011b rozemlet\u00fdm pr\u00e1\u0161kem oxidu hlinit\u00e9ho, kter\u00fd se m\u00eds\u00ed s mal\u00fdm mno\u017estv\u00edm sp\u00e9kac\u00edch p\u0159\u00edsad. Pr\u00e1\u0161ek se pak v\u00e1lcov\u00e1n\u00edm nebo izostatick\u00fdm lisov\u00e1n\u00edm formuje do koul\u00ed, su\u0161\u00ed se a vypaluje p\u0159i teplot\u00e1ch v\u00fdrazn\u011b vy\u0161\u0161\u00edch ne\u017e 1500 \u00b0C. B\u011bhem sp\u00e9k\u00e1n\u00ed se \u010d\u00e1stice spoj\u00ed do hust\u00e9, jemnozrnn\u00e9 struktury s velmi n\u00edzkou p\u00f3rovitost\u00ed. Hotov\u00e9 kuli\u010dky se vyr\u00e1b\u011bj\u00ed ve velikostech od p\u0159ibli\u017en\u011b 3 mm do 80 mm nebo v\u011bt\u0161\u00edch, v z\u00e1vislosti na pr\u016fm\u011bru ml\u00fdna a c\u00edlov\u00e9 velikosti \u010d\u00e1stic.<\/p>\n
V provozu je nejd\u016fle\u017eit\u011bj\u0161\u00ed, jak se tyto vlastnosti projev\u00ed v ka\u017edodenn\u00edm provozu. Hlin\u00edkov\u00e9 kuli\u010dky maj\u00ed tvrdost kolem 9 stup\u0148\u016f podle Mohse, co\u017e je dostate\u010dn\u011b vysok\u00e1 hodnota pro \u00fa\u010dinn\u00e9 mlet\u00ed k\u0159emene, \u017eivce, zirkonu a mnoha rud. Jejich objemov\u00e1 hmotnost se pohybuje mezi 3,6 a 3,9 g\/cm\u00b3, tak\u017ee ka\u017ed\u00e1 kuli\u010dka nese dobrou energii \u00faderu, ani\u017e by byla p\u0159\u00edli\u0161 t\u011b\u017ek\u00e1. M\u00edra opot\u0159eben\u00ed p\u0159i mokr\u00e9m mlet\u00ed je obvykle velmi n\u00edzk\u00e1 - za norm\u00e1ln\u00edch podm\u00ednek \u010dasto ni\u017e\u0161\u00ed ne\u017e 0,02 % za hodinu - co\u017e znamen\u00e1, \u017ee n\u00e1pl\u0148 m\u00e9dia vydr\u017e\u00ed d\u00e9le a oblo\u017een\u00ed ml\u00fdna se m\u00e9n\u011b agresivn\u011b ot\u00edr\u00e1. Proto\u017ee je materi\u00e1l chemicky inertn\u00ed, nereaguje s v\u011bt\u0161inou kyselin, louh\u016f ani organick\u00fdch slou\u010denin a prakticky nevn\u00e1\u0161\u00ed \u017eelezo ani jin\u00e9 kovov\u00e9 ne\u010distoty. Tento posledn\u00ed bod je velmi d\u016fle\u017eit\u00fd p\u0159i brou\u0161en\u00ed keramick\u00fdch t\u011bles nebo glazur, kdy i mal\u00e9 mno\u017estv\u00ed \u017eeleza m\u016f\u017ee zm\u011bnit barvu nebo zp\u016fsobit vady vyp\u00e1len\u00e9ho v\u00fdrobku.<\/p>\n
Praktick\u00fd rozd\u00edl jsem vid\u011bl mnohokr\u00e1t. V jedn\u00e9 glazovn\u011b se p\u0159echodem z k\u0159emenn\u00fdch obl\u00e1zk\u016f na kuli\u010dky oxidu hlinit\u00e9ho 95 % zkr\u00e1tila doba mlet\u00ed zhruba o 25 % a z\u00e1rove\u0148 se zlep\u0161ila konzistence d\u00e1vky. Obl\u00e1zky se opot\u0159ebov\u00e1valy nerovnom\u011brn\u011b a ob\u010das se od\u0161t\u00edply, tak\u017ee z\u016fstaly hrub\u00e9 \u010d\u00e1stice, kter\u00e9 se musely pros\u00e9vat. Korundov\u00e9 kuli\u010dky z\u016fstaly d\u00e9le kulat\u00e9 a vytv\u00e1\u0159ely p\u0159esn\u011bj\u0161\u00ed distribuci velikosti \u010d\u00e1stic. V okruhu mlet\u00ed miner\u00e1l\u016f zpracov\u00e1vaj\u00edc\u00edch k\u0159emi\u010dit\u00fd p\u00edsek stejn\u00e1 m\u00e9dia sn\u00ed\u017eila odb\u011br \u017eeleza pod detekovatelnou mez, co\u017e eliminovalo dal\u0161\u00ed krok magnetick\u00e9 separace za n\u00edm. Takov\u00e9to zisky se rychle s\u010d\u00edtaj\u00ed, pokud je v nep\u0159etr\u017eit\u00e9m provozu v\u00edce ml\u00fdn\u016f.<\/p>\n
Kuli\u010dky oxidu hlinit\u00e9ho samoz\u0159ejm\u011b nejsou spr\u00e1vnou volbou pro ka\u017edou aplikaci. Jejich cena za kilogram je vy\u0161\u0161\u00ed ne\u017e cena ocelov\u00fdch kuli\u010dek nebo z\u00e1kladn\u00edch keramick\u00fdch m\u00e9di\u00ed, tak\u017ee ospravedln\u011bn\u00ed obvykle vych\u00e1z\u00ed ze sn\u00ed\u017een\u00ed kontaminace, del\u0161\u00ed \u017eivotnosti m\u00e9di\u00ed nebo ni\u017e\u0161\u00ed spot\u0159eby energie na tunu produktu. P\u0159i velmi siln\u00e9m such\u00e9m mlet\u00ed extr\u00e9mn\u011b tvrd\u00fdch rud mohou b\u00fdt zirkonov\u00e1 nebo ocelov\u00e1 m\u00e9dia st\u00e1le up\u0159ednost\u0148ov\u00e1na kv\u016fli vy\u0161\u0161\u00ed hustot\u011b a hou\u017eevnatosti. Hlin\u00edkov\u00e1 koule se tak\u00e9 m\u016f\u017ee od\u0161t\u00edpnout nebo zlomit, pokud ml\u00fdn b\u011b\u017e\u00ed del\u0161\u00ed dobu napr\u00e1zdno nebo pokud se do n\u00e1pln\u011b dostanou ciz\u00ed kovov\u00e9 p\u0159edm\u011bty, tak\u017ee z\u00e1le\u017e\u00ed na dobr\u00e9m hospoda\u0159en\u00ed a spr\u00e1vn\u00fdch postupech nakl\u00e1d\u00e1n\u00ed ml\u00fdna.<\/p>\n
V\u00fdb\u011br a detaily obsluhy maj\u00ed znateln\u00fd v\u00fdznam. \u010castou chybou je pou\u017eit\u00ed jedn\u00e9 velikosti kuli\u010dky pro celou n\u00e1pl\u0148. Nej\u00fa\u010dinn\u011bj\u0161\u00ed nastaven\u00ed pou\u017e\u00edvaj\u00ed odstup\u0148ovanou n\u00e1pl\u0148 - v\u011bt\u0161\u00ed kuli\u010dky pro po\u010d\u00e1te\u010dn\u00ed rozm\u011bln\u011bn\u00ed a postupn\u011b men\u0161\u00ed pro jemn\u00e9 mlet\u00ed. U mokr\u00fdch ml\u00fdn\u016f je t\u0159eba sledovat tak\u00e9 pom\u011br kuli\u010dek k materi\u00e1lu a viskozitu kalu; p\u0159\u00edli\u0161 visk\u00f3zn\u00ed kaly mohou kuli\u010dky tlumit a sni\u017eovat \u00fa\u010dinnost mlet\u00ed. Pravideln\u00e9 kontroly opot\u0159eben\u00ed kuli\u010dek a ob\u010dasn\u00e9 dopl\u0148ov\u00e1n\u00ed n\u00e1pln\u011b udr\u017euj\u00ed n\u00e1pl\u0148 v co nejlep\u0161\u00edm stavu. Obvykle doporu\u010duji m\u00edt na m\u00edst\u011b malou z\u00e1sobu nejpou\u017e\u00edvan\u011bj\u0161\u00edch velikost\u00ed, aby ml\u00fdny nemusely pracovat s vy\u010derpanou nebo \u0161patn\u011b odstup\u0148ovanou n\u00e1pln\u00ed p\u0159i \u010dek\u00e1n\u00ed na dod\u00e1vku.<\/p>\n
Manipulace je jednoduch\u00e1, ale stoj\u00ed za to ji prov\u00e1d\u011bt pe\u010dliv\u011b. Nov\u00e9 m\u00ed\u010dky je t\u0159eba p\u0159ed nalo\u017een\u00edm zkontrolovat, zda nejsou praskl\u00e9 nebo na\u0161t\u00edpnut\u00e9. P\u0159i nab\u00edjen\u00ed ml\u00fdnku je nejlep\u0161\u00ed p\u0159id\u00e1vat je postupn\u011b, zat\u00edmco se ml\u00fdnek pomalu ot\u00e1\u010d\u00ed, ne\u017e vysypat celou n\u00e1pl\u0148 najednou. Opot\u0159ebovan\u00e9 kuli\u010dky lze po kampani \u010dasto pros\u00edt a znovu pou\u017e\u00edt v jin\u00e9m ml\u00fdn\u011b, kter\u00fd snese o n\u011bco men\u0161\u00ed m\u00e9dia.<\/p>\n
Z \u0161ir\u0161\u00edho pohledu se korundov\u00e9 mlec\u00ed koule dob\u0159e hod\u00ed k sou\u010dasn\u00fdm tlak\u016fm na sn\u00ed\u017een\u00ed spot\u0159eby energie a odpadu. Proto\u017ee se opot\u0159ebov\u00e1vaj\u00ed pomalu, je objem vyho\u0159el\u00fdch m\u00e9di\u00ed, kter\u00e1 je t\u0159eba zlikvidovat nebo recyklovat, ni\u017e\u0161\u00ed ne\u017e u mnoha alternativ. Jejich konzistentn\u00ed v\u00fdkon tak\u00e9 pom\u00e1h\u00e1 z\u00e1vod\u016fm udr\u017eovat st\u00e1l\u00fd v\u00fdkon, co\u017e nep\u0159\u00edmo sni\u017euje mno\u017estv\u00ed energie, kter\u00e9 se vypl\u00fdtv\u00e1 b\u011bhem cykl\u016f spou\u0161t\u011bn\u00ed a odstavov\u00e1n\u00ed.<\/p>\n
Nakonec jsou korundov\u00e9 mlec\u00ed koule st\u00e1le obl\u00edben\u00e9, proto\u017ee \u0159e\u0161\u00ed probl\u00e9my, kter\u00e9 jsou v provozn\u00edch za\u0159\u00edzen\u00edch skute\u010dn\u011b d\u016fle\u017eit\u00e9: n\u00edzk\u00e9 zne\u010di\u0161t\u011bn\u00ed, p\u0159edv\u00eddateln\u00e9 opot\u0159eben\u00ed a p\u0159ijateln\u00e9 celkov\u00e9 n\u00e1klady po celou dobu \u017eivotnosti n\u00e1pln\u011b. Nenahrad\u00ed v\u0161echny ostatn\u00ed typy m\u00e9di\u00ed, ale pokud si ve va\u0161em procesu cen\u00edte \u010distoty a konzistence stejn\u011b jako hrub\u00e9 rychlosti mlet\u00ed, z\u016fst\u00e1vaj\u00ed jednou z nejprakti\u010dt\u011bj\u0161\u00edch dostupn\u00fdch voleb. Pokud posuzujete m\u00e9dia pro nov\u00fd nebo st\u00e1vaj\u00edc\u00ed ml\u00fdn, je spr\u00e1vn\u011b navr\u017een\u00fd zku\u0161ebn\u00ed provoz se skute\u010dn\u00fdm vstupn\u00edm materi\u00e1lem st\u00e1le nejlep\u0161\u00edm zp\u016fsobem, jak potvrdit ekonomick\u00e9 parametry pro va\u0161e konkr\u00e9tn\u00ed podm\u00ednky.<\/p>","protected":false},"excerpt":{"rendered":"
After more than twenty years specifying grinding media for ceramics plants, mineral processors, and specialty chemical operations, I\u2019ve learned that […]<\/p>\n","protected":false},"author":1,"featured_media":0,"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":"","theme-transparent-header-meta":"default","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","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-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-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-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-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-gradient":""}},"footnotes":""},"categories":[6],"tags":[],"class_list":["post-432","post","type-post","status-publish","format-standard","hentry","category-alumina-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/posts\/432","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/comments?post=432"}],"version-history":[{"count":1,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/posts\/432\/revisions"}],"predecessor-version":[{"id":433,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/posts\/432\/revisions\/433"}],"wp:attachment":[{"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/media?parent=432"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/categories?post=432"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/tags?post=432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}