Po viac ako dvadsiatich rokoch \u0161pecifikovania br\u00fasnych m\u00e9di\u00ed pre keramick\u00e9 z\u00e1vody, spracovate\u013eov miner\u00e1lov a \u0161peci\u00e1lne chemick\u00e9 prev\u00e1dzky som sa nau\u010dil, \u017ee najlacnej\u0161ie m\u00e9di\u00e1 sa m\u00e1lokedy uk\u00e1\u017eu ako najhospod\u00e1rnej\u0161ie. Hlin\u00edkov\u00e9 br\u00fasne gu\u013e\u00f4\u010dky sa nach\u00e1dzaj\u00fa na u\u017eito\u010dnej strednej \u00farovni, kde sa v\u00fdkon, kontrola zne\u010distenia a celkov\u00e9 n\u00e1klady na vlastn\u00edctvo skuto\u010dne zhoduj\u00fa. Nie s\u00fa najtvrd\u0161ie ani naj\u013eah\u0161ie na trhu, ale vo v\u00e4\u010d\u0161ine pr\u00e1c na mokrom a suchom mlet\u00ed, na ktor\u00fdch som sa podie\u013eal, poskytuj\u00fa po\u010das dlh\u00fdch kampan\u00ed najpredv\u00eddate\u013enej\u0161ie v\u00fdsledky.<\/p>\n
Tieto gu\u013e\u00f4\u010dky s\u00fa vyroben\u00e9 z oxidu hlinit\u00e9ho, zvy\u010dajne v rozsahu 92 % a\u017e 99 % Al\u2082O\u2083. \u010c\u00edm vy\u0161\u0161\u00ed je obsah oxidu hlinit\u00e9ho, t\u00fdm lep\u0161ia je odolnos\u0165 proti opotrebovaniu a t\u00fdm ni\u017e\u0161ie je riziko vn\u00e1\u0161ania ne\u010dist\u00f4t. V\u00fdroba sa za\u010d\u00edna starostlivo vyfr\u00e9zovan\u00fdm pr\u00e1\u0161kom oxidu hlinit\u00e9ho, ktor\u00fd sa zmie\u0161a s mal\u00fdm mno\u017estvom spekan\u00fdch pomocn\u00fdch l\u00e1tok. Pr\u00e1\u0161ok sa potom valcovan\u00edm alebo izostatick\u00fdm lisovan\u00edm formuje do gu\u013e\u00f4\u010dok, su\u0161\u00ed sa a vypa\u013euje pri teplot\u00e1ch v\u00fdrazne vy\u0161\u0161\u00edch ako 1 500 \u00b0C. Po\u010das spekania sa \u010dastice spoja do hustej, jemnozrnnej \u0161trukt\u00fary s ve\u013emi n\u00edzkou p\u00f3rovitos\u0165ou. Hotov\u00e9 gu\u013e\u00f4\u010dky sa vyr\u00e1baj\u00fa vo ve\u013ekostiach od pribli\u017ene 3 mm do 80 mm alebo v\u00e4\u010d\u0161\u00edch, v z\u00e1vislosti od priemeru mlyna a cie\u013eovej ve\u013ekosti \u010dast\u00edc.<\/p>\n
V prev\u00e1dzke je najd\u00f4le\u017eitej\u0161ie, ako sa tieto vlastnosti premietnu do ka\u017edodennej prev\u00e1dzky. Gu\u013e\u00f4\u010dky oxidu hlinit\u00e9ho maj\u00fa tvrdos\u0165 okolo 9 stup\u0148ov pod\u013ea Mohsa, \u010do je dostato\u010dne vysok\u00e1 hodnota na \u00fa\u010dinn\u00e9 mletie kreme\u0148a, \u017eivca, zirk\u00f3nu a mnoh\u00fdch r\u00fad. Ich objemov\u00e1 hustota sa pohybuje medzi 3,6 a 3,9 g\/cm\u00b3, tak\u017ee ka\u017ed\u00e1 gu\u013e\u00f4\u010dka m\u00e1 dobr\u00fa n\u00e1razov\u00fa energiu bez toho, aby bola pr\u00edli\u0161 \u0165a\u017ek\u00e1. Miera opotrebenia pri mokrom mlet\u00ed je zvy\u010dajne ve\u013emi n\u00edzka - za norm\u00e1lnych podmienok \u010dasto ni\u017e\u0161ia ako 0,02 % za hodinu - \u010do znamen\u00e1, \u017ee n\u00e1pl\u0148 m\u00e9dia vydr\u017e\u00ed dlh\u0161ie a oblo\u017eenie mlyna sa menej agres\u00edvne obrusuje. Ke\u010f\u017ee materi\u00e1l je chemicky inertn\u00fd, nereaguje s v\u00e4\u010d\u0161inou kysel\u00edn, z\u00e1sad alebo organick\u00fdch zl\u00fa\u010den\u00edn a prakticky nevn\u00e1\u0161a \u017eelezo ani in\u00e9 kovov\u00e9 ne\u010distoty. Tento posledn\u00fd bod je ve\u013emi d\u00f4le\u017eit\u00fd pri br\u00fasen\u00ed keramick\u00fdch telies alebo glaz\u00far, kde aj mal\u00e9 mno\u017estvo \u017eeleza m\u00f4\u017ee zmeni\u0165 farbu alebo sp\u00f4sobi\u0165 chyby vo vyp\u00e1lenom v\u00fdrobku.<\/p>\n
Praktick\u00fd rozdiel som videl u\u017e mnohokr\u00e1t. V jednom z\u00e1vode na v\u00fdrobu glaz\u00fary sa prechodom z kremenn\u00fdch kamienkov na gu\u013e\u00f4\u010dky oxidu hlinit\u00e9ho 95 % skr\u00e1til \u010das mletia pribli\u017ene o 25 % a z\u00e1rove\u0148 sa zlep\u0161ila konzistencia d\u00e1vky. Kamienky sa opotrebov\u00e1vali nerovnomerne a ob\u010das sa od\u0161tiepili, pri\u010dom zanech\u00e1vali hrub\u00e9 \u010dastice, ktor\u00e9 sa museli preosieva\u0165. Gu\u013e\u00f4\u010dky z oxidu hlinit\u00e9ho zost\u00e1vali dlh\u0161ie gu\u013eat\u00e9 a vytv\u00e1rali presnej\u0161ie rozdelenie ve\u013ekosti \u010dast\u00edc. V okruhu mletia miner\u00e1lov sprac\u00favaj\u00facich kremi\u010dit\u00fd piesok tie ist\u00e9 m\u00e9di\u00e1 zn\u00ed\u017eili vyzdvihovanie \u017eeleza pod detekovate\u013en\u00fa hranicu, \u010d\u00edm sa eliminoval \u010fal\u0161\u00ed krok magnetickej separ\u00e1cie v nadv\u00e4zuj\u00facom procese. Tak\u00e9to zisky sa r\u00fdchlo s\u010d\u00edtaj\u00fa, ke\u010f je v nepretr\u017eitej prev\u00e1dzke viacero mlynov.<\/p>\n
Samozrejme, gu\u013e\u00f4\u010dky z oxidu hlinit\u00e9ho nie s\u00fa spr\u00e1vnym rie\u0161en\u00edm pre ka\u017ed\u00fa aplik\u00e1ciu. Ich cena na kilogram je vy\u0161\u0161ia ako cena oce\u013eov\u00fdch gu\u013e\u00f4\u010dok alebo z\u00e1kladn\u00fdch keramick\u00fdch m\u00e9di\u00ed, tak\u017ee od\u00f4vodnenie zvy\u010dajne poch\u00e1dza zo zn\u00ed\u017eenej kontamin\u00e1cie, dlh\u0161ej \u017eivotnosti m\u00e9di\u00ed alebo ni\u017e\u0161ej spotreby energie na tonu v\u00fdrobku. Pri ve\u013emi silnom suchom mlet\u00ed extr\u00e9mne tvrd\u00fdch r\u00fad sa st\u00e1le m\u00f4\u017eu uprednost\u0148ova\u0165 zirk\u00f3nov\u00e9 alebo oce\u013eov\u00e9 m\u00e9di\u00e1 kv\u00f4li vy\u0161\u0161ej hustote a h\u00fa\u017eevnatosti. Hlin\u00edkov\u00e1 gu\u013ea sa m\u00f4\u017ee tie\u017e od\u0161tiepi\u0165 alebo zlomi\u0165, ak mlyn be\u017e\u00ed dlho napr\u00e1zdno alebo ak sa do n\u00e1plne dostan\u00fa cudzie kovov\u00e9 predmety, preto je d\u00f4le\u017eit\u00e9 dobr\u00e9 hospod\u00e1renie a spr\u00e1vne postupy pri plnen\u00ed mlyna.<\/p>\n
V\u00fdber a prev\u00e1dzkov\u00e9 detaily s\u00fa v\u00fdrazn\u00fdm rozdielom. \u010castou chybou je pou\u017eitie jednej ve\u013ekosti gu\u013e\u00f4\u010dky pre cel\u00fa n\u00e1pl\u0148. Najefekt\u00edvnej\u0161ie nastavenia pou\u017e\u00edvaj\u00fa odstup\u0148ovan\u00fa n\u00e1pl\u0148 - v\u00e4\u010d\u0161ie gu\u013e\u00f4\u010dky na po\u010diato\u010dn\u00e9 rozbitie a postupne men\u0161ie na jemn\u00e9 mletie. V mokr\u00fdch mlynoch je potrebn\u00e9 sledova\u0165 aj pomer gu\u013e\u00f4\u010dok k materi\u00e1lu a viskozitu kalu; pr\u00edli\u0161 visk\u00f3zne kaly m\u00f4\u017eu gu\u013e\u00f4\u010dky tlmi\u0165 a zni\u017eova\u0165 \u00fa\u010dinnos\u0165 mletia. Pravideln\u00e9 kontroly opotrebenia gu\u013e\u00f4\u010dok a ob\u010dasn\u00e9 doplnenie n\u00e1plne udr\u017euj\u00fa n\u00e1pl\u0148 v \u010do najlep\u0161om stave. Zvy\u010dajne odpor\u00fa\u010dam ma\u0165 na mieste mal\u00fa z\u00e1sobu najpou\u017e\u00edvanej\u0161\u00edch ve\u013ekost\u00ed, aby mlyny nemuseli pracova\u0165 s vy\u010derpanou alebo zle triedenou n\u00e1pl\u0148ou po\u010das \u010dakania na dod\u00e1vku.<\/p>\n
Manipul\u00e1cia je jednoduch\u00e1, ale oplat\u00ed sa ju vykon\u00e1va\u0165 opatrne. Nov\u00e9 lopti\u010dky by sa mali pred nalo\u017een\u00edm skontrolova\u0165, \u010di nemaj\u00fa praskliny alebo triesky. Pri nab\u00edjan\u00ed mlyna je najlep\u0161ie prid\u00e1va\u0165 ich postupne, k\u00fdm sa mlyn pomaly ot\u00e1\u010da, a nie vysypa\u0165 cel\u00fa n\u00e1pl\u0148 naraz. Po kampani sa opotrebovan\u00e9 gu\u013e\u00f4\u010dky \u010dasto daj\u00fa preosia\u0165 a znovu pou\u017ei\u0165 v inom mlyne, ktor\u00fd toleruje o nie\u010do men\u0161ie m\u00e9di\u00e1.<\/p>\n
Zo \u0161ir\u0161ieho h\u013eadiska korundov\u00e9 mlecie gu\u013e\u00f4\u010dky dobre zapadaj\u00fa do s\u00fa\u010dasn\u00fdch tlakov na zn\u00ed\u017eenie spotreby energie a odpadu. Ke\u010f\u017ee sa opotreb\u00favaj\u00fa pomaly, objem pou\u017eit\u00fdch m\u00e9di\u00ed, ktor\u00e9 sa musia zlikvidova\u0165 alebo recyklova\u0165, je ni\u017e\u0161\u00ed ako pri mnoh\u00fdch alternat\u00edvach. Ich konzistentn\u00fd v\u00fdkon tie\u017e pom\u00e1ha z\u00e1vodom udr\u017eiava\u0165 stabiln\u00fa priepustnos\u0165, \u010do nepriamo zni\u017euje plytvanie energiou po\u010das n\u00e1behov a odst\u00e1vok.<\/p>\n
Nakoniec, korundov\u00e9 mlecie gu\u013e\u00f4\u010dky zost\u00e1vaj\u00fa ob\u013e\u00faben\u00e9, preto\u017ee rie\u0161ia probl\u00e9my, ktor\u00e9 s\u00fa v prev\u00e1dzkov\u00fdch zariadeniach skuto\u010dne d\u00f4le\u017eit\u00e9: n\u00edzka kontamin\u00e1cia, predv\u00eddate\u013en\u00e9 opotrebovanie a prijate\u013en\u00e9 celkov\u00e9 n\u00e1klady po\u010das \u017eivotnosti n\u00e1plne. Nenahradia ka\u017ed\u00fd in\u00fd typ m\u00e9dia, ale ke\u010f si v\u00e1\u0161 proces cen\u00ed \u010distotu a konzistenciu rovnako ako r\u00fdchlos\u0165 hrub\u00e9ho mletia, s\u00fa na\u010falej jednou z najpraktickej\u0161\u00edch dostupn\u00fdch mo\u017enost\u00ed. Ak hodnot\u00edte m\u00e9di\u00e1 pre nov\u00fd alebo existuj\u00faci mlyn, spr\u00e1vne navrhnut\u00e1 sk\u00fa\u0161obn\u00e1 prev\u00e1dzka so skuto\u010dn\u00fdm vstupn\u00fdm materi\u00e1lom je st\u00e1le najlep\u0161\u00edm sp\u00f4sobom, ako potvrdi\u0165 ekonomick\u00fa v\u00fdhodnos\u0165 pre va\u0161e konkr\u00e9tne podmienky.<\/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\/sk\/wp-json\/wp\/v2\/posts\/432","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/comments?post=432"}],"version-history":[{"count":1,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts\/432\/revisions"}],"predecessor-version":[{"id":433,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts\/432\/revisions\/433"}],"wp:attachment":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/media?parent=432"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/categories?post=432"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/tags?post=432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}