Bauxit je prim\u00e1rn\u00ed surovinou pou\u017e\u00edvanou k v\u00fdrob\u011b hlin\u00edku. Tento j\u00edlovit\u00fd miner\u00e1l se skl\u00e1d\u00e1 z alu-hydroxid\u016f, jako je gibbsit, boehmit a diaspor, kter\u00e9 vznikly intenzivn\u00edm lateritick\u00fdm zv\u011btr\u00e1v\u00e1n\u00edm.<\/p>\n
Bauxitov\u00e1 ruda se nejprve rozdrt\u00ed a promyje a pot\u00e9 se rozpust\u00ed v hork\u00e9m roztoku \u017e\u00edrav\u00e9 sody, tzv. \"zelen\u00e9m louhu\". Jakmile je tento zelen\u00fd roztok p\u0159eveden do vysok\u00fdch sr\u00e1\u017eec\u00edch n\u00e1dr\u017e\u00ed s p\u0159idan\u00fdmi semeny hydroxidu hlinit\u00e9ho pro vysr\u00e1\u017een\u00ed pevn\u00e9ho hydr\u00e1tu oxidu hlinit\u00e9ho p\u0159i ochlazen\u00ed, mohou b\u00fdt sr\u00e1\u017eec\u00ed n\u00e1dr\u017ee vyu\u017eity tak\u00e9 k urychlen\u00ed tuhnut\u00ed.<\/p>\n
Ve velk\u00fdch pr\u016fmyslov\u00fdch z\u00e1vodech je Bayer\u016fv proces t\u00edm nejzaj\u00edmav\u011bj\u0161\u00edm. Pr\u00e1v\u011b tady vznik\u00e1 pr\u016fmyslov\u00e1 chemie, kter\u00e1 p\u0159em\u011b\u0148uje suroviny na v\u00fdrobky prosp\u011b\u0161n\u00e9 pro spole\u010dnost. Tento v\u00edcestup\u0148ov\u00fd proces vyu\u017e\u00edv\u00e1 r\u016fzn\u00e1 filtra\u010dn\u00ed a separa\u010dn\u00ed za\u0159\u00edzen\u00ed a zahrnuje tak\u00e9 ot\u00e1zky \u017eivotn\u00edho prost\u0159ed\u00ed; jeho vedlej\u0161\u00ed produkty, jako je \u010derven\u00e9 bahno, vy\u017eaduj\u00ed p\u0159ed likvidac\u00ed pe\u010dliv\u00e9 zach\u00e1zen\u00ed.<\/p>\n
Bauxitov\u00e1 ruda se zpracov\u00e1v\u00e1 pomoc\u00ed roztoku kaustick\u00e9 sody a rozkladem za zv\u00fd\u0161en\u00fdch tlak\u016f a teplot se z n\u00ed z\u00edsk\u00e1vaj\u00ed rozpustn\u00e9 hodnoty oxidu hlinit\u00e9ho, p\u0159i\u010dem\u017e vznik\u00e1 z\u0159ed\u011bn\u00fd roztok hlinitanu sodn\u00e9ho a nerozpustn\u00fd \u017e\u00edrav\u00fd zbytek zn\u00e1m\u00fd jako \u010derven\u00e9 bahno. Tento \u017e\u00e1ruvzdorn\u00fd materi\u00e1l vy\u017eaduje zvl\u00e1\u0161tn\u00ed zach\u00e1zen\u00ed, proto\u017ee m\u016f\u017ee obsahovat t\u011b\u017ek\u00e9 kovy, alkalick\u00e9 slou\u010deniny a fenolov\u00e9 slou\u010deniny; proto jej m\u00edstn\u00ed regula\u010dn\u00ed org\u00e1ny klasifikuj\u00ed jako nebezpe\u010dn\u00fd odpad.<\/p>\n
Roztok hydroxidu sodn\u00e9ho pak proch\u00e1z\u00ed \u0159adou \u0161estipatrov\u00fdch sr\u00e1\u017eec\u00edch n\u00e1dr\u017e\u00ed, do nich\u017e se p\u0159id\u00e1vaj\u00ed krystaly hydr\u00e1tu oxidu hlinit\u00e9ho, kter\u00e9 se nechaj\u00ed r\u016fst a nakonec k sob\u011b p\u0159it\u00e1hnou v\u0161echny molekuly vody v roztoku, \u010d\u00edm\u017e vznikne b\u00edl\u00e1 pevn\u00e1 l\u00e1tka hydroxidu hlinit\u00e9ho, kter\u00e1 se pozd\u011bji pou\u017eije v Hall-Heroultov\u011b tavic\u00edm procesu na v\u00fdrobu kovov\u00e9ho hlin\u00edku.<\/p>\n
P\u0159efiltrovan\u00fd a promyt\u00fd oxid hlinit\u00fd se pak d\u00e1le zpracov\u00e1v\u00e1, aby se odstranila zb\u00fdvaj\u00edc\u00ed soda kaustick\u00e1 a dal\u0161\u00ed ne\u010distoty, a pot\u00e9 se su\u0161\u00ed a zah\u0159\u00edv\u00e1, aby se odstranila p\u0159ebyte\u010dn\u00e1 vlhkost zp\u016fsoben\u00e1 krystalizac\u00ed kalcinac\u00ed - co\u017e je nezbytn\u00fd krok.<\/p>\n
Bezvod\u00fd oxid hlinit\u00fd vyroben\u00fd p\u0159i jeho zpracov\u00e1n\u00ed je okam\u017eit\u011b p\u0159ipraven k pou\u017eit\u00ed a n\u00e1sledn\u011b je tvarov\u00e1n do r\u016fzn\u00fdch forem pomoc\u00ed metod, jako je such\u00e9 lisov\u00e1n\u00ed, izostatick\u00e9 lisov\u00e1n\u00ed, v\u00e1lcov\u00e1n\u00ed, vst\u0159ikov\u00e1n\u00ed a\/nebo kluzn\u00e9 lit\u00ed. Po vytvarov\u00e1n\u00ed z n\u011bj lze vyr\u00e1b\u011bt odlitky z plech\u016f a ty\u010d\u00ed a izostaticky lisovan\u00e9 izola\u010dn\u00ed a t\u011bsnic\u00ed materi\u00e1ly pou\u017e\u00edvan\u00e9 v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch - v\u011bt\u0161ina produkce slou\u017e\u00ed pro metalurgick\u00e9 \u00fa\u010dely, zat\u00edmco zbytek nach\u00e1z\u00ed vyu\u017eit\u00ed ve speci\u00e1ln\u00edch aplikac\u00edch nebo jako chemik\u00e1lie z n\u011bj odvozen\u00e9.<\/p>\n
Charles Martin Hall za\u010dal v roce 1880 zkoumat metody v\u00fdroby hlin\u00edku. Zjistil, \u017ee p\u0159i pr\u016fchodu elektrick\u00e9ho proudu oxidem hlinit\u00fdm doch\u00e1z\u00ed k jeho rozpadu na kysl\u00edk a kovov\u00fd hlin\u00edk, p\u0159i\u010dem\u017e Hall\u016fv n\u00e1sledn\u00fd objev spo\u010d\u00edval v tom, \u017ee kryolitov\u00fd roztok dok\u00e1\u017ee tento materi\u00e1l rozpustit a uvolnit jeho vz\u00e1cn\u00e9 vlastnosti; vznikl tak Hall\u016fv-Heroult\u016fv elektrolytick\u00fd proces, kter\u00fd se do roku 1908 stal z\u00e1kladn\u00edm zp\u016fsobem v\u00fdroby prim\u00e1rn\u00edho hlin\u00edku.<\/p>\n
Taven\u00ed hlin\u00edku vy\u017eaduje st\u00e1l\u00e9 a rozs\u00e1hl\u00e9 mno\u017estv\u00ed elektrick\u00e9 energie. Kryolitov\u00e1 l\u00e1ze\u0148 mus\u00ed b\u00fdt udr\u017eov\u00e1na na ide\u00e1ln\u00ed provozn\u00ed teplot\u011b, aby bylo mo\u017en\u00e9 ji nep\u0159etr\u017eit\u011b vyr\u00e1b\u011bt, p\u0159i\u010dem\u017e p\u0159ebyte\u010dn\u00fd hlin\u00edk, kter\u00fd se nahromad\u00ed na katod\u011b, se pravideln\u011b od\u010derp\u00e1v\u00e1 a pos\u00edl\u00e1 do velk\u00fdch udr\u017eovac\u00edch pec\u00ed, kde se odstra\u0148uj\u00ed ne\u010distoty, p\u0159id\u00e1vaj\u00ed se leguj\u00edc\u00ed prvky a pot\u00e9 se odl\u00e9v\u00e1 do ingot\u016f.<\/p>\n
Aby byl tento proces ekonomicky \u017eivotaschopn\u00fd, je nezbytn\u00e9 \u0159\u00eddit rychlost p\u0159\u00edsunu oxidu hlinit\u00e9ho do kryolitov\u00e9 l\u00e1zn\u011b tak, aby se udr\u017eovala konstantn\u00ed koncentrace v optim\u00e1ln\u00edm rozmez\u00ed. Na tento faktor m\u016f\u017ee m\u00edt vliv mnoho faktor\u016f, v\u010detn\u011b velikosti \u010d\u00e1stic a m\u00edch\u00e1n\u00ed.<\/p>\n
Proveden\u00edm rentgenov\u00e9 difrak\u010dn\u00ed anal\u00fdzy kryolitov\u00e9 l\u00e1zn\u011b lze snadno kontrolovat mno\u017estv\u00ed p\u0159\u00edtomn\u00e9ho v\u00e1pn\u00edku a ho\u0159\u010d\u00edku. Bohu\u017eel v\u0161ak tato rentgenov\u00e1 metoda trp\u00ed n\u011bkolika nedostatky, kter\u00e9 omezuj\u00ed jej\u00ed p\u0159esnost: pat\u0159\u00ed k nim obt\u00ed\u017en\u00e1 anal\u00fdza jej\u00edho pr\u00e1\u0161kov\u00e9ho vzoru a tak\u00e9 p\u0159ekr\u00fdv\u00e1n\u00ed anal\u00fdzy p\u00edk\u016f semiamorfn\u00edho kryolitu NaCaAlF6 s analytick\u00fdmi p\u00edky chiolitu i weberitu; pouze touto rentgenovou metodou je obt\u00ed\u017en\u00e9 odli\u0161it neiborit od neibouritu!<\/p>\n
Tav\u00edrny pou\u017e\u00edvaj\u00ed vysokotlak\u00e9 difrak\u010dn\u00ed syst\u00e9my k p\u0159esn\u00e9mu sledov\u00e1n\u00ed teploty kryolitov\u00e9 l\u00e1zn\u011b v re\u00e1ln\u00e9m \u010dase a k p\u0159edv\u00edd\u00e1n\u00ed okam\u017eiku, kdy dojde k jej\u00edmu zamrznut\u00ed, co\u017e jsou z\u00e1sadn\u00ed sou\u010d\u00e1sti jejich procesu. Tento syst\u00e9m nav\u00edc dok\u00e1\u017ee odhalit ne\u010distoty uhl\u00edku - kter\u00e9 p\u0159edstavuj\u00ed zdravotn\u00ed riziko pro pracovn\u00edky vystaven\u00e9 jeho p\u016fsoben\u00ed v dolech, sl\u00e9v\u00e1rn\u00e1ch a tov\u00e1rn\u00e1ch - a tak\u00e9 miner\u00e1ln\u00ed inkluze, jako je pyrit nebo kalcit, kter\u00e9 indikuj\u00ed ne\u010distoty v samotn\u00e9m oxidu hlinit\u00e9m.<\/p>\n
Hlin\u00edk lze z\u00edskat (za neekonomick\u00fdch n\u00e1klad\u016f) z n\u011bkter\u00fdch j\u00edl\u016f, ale v\u011bt\u0161ina produkce poch\u00e1z\u00ed z t\u011b\u017eby a rafinace bauxitu na oxid hlinit\u00fd. Hlin\u00edk pak slou\u017e\u00ed jako surovina pro v\u00fdrobu kovov\u00e9ho hlin\u00edku; tento energeticky n\u00e1ro\u010dn\u00fd proces spot\u0159ebov\u00e1v\u00e1 velk\u00e9 mno\u017estv\u00ed elektrick\u00e9 energie. V sou\u010dasn\u00e9 dob\u011b se celosv\u011btov\u00e1 v\u00fdroba oxidu hlinit\u00e9ho rychle roz\u0161i\u0159uje pomoc\u00ed variant technologie Bayerova procesu (i kdy\u017e obt\u00ed\u017en\u011bj\u0161\u00ed bauxity s vysok\u00fdm obsahem diasporu mohou vy\u017eadovat jin\u00e9 varianty).<\/p>\n
Jemn\u011b rozemlet\u00fd bauxit se pod tlakem kombinuje ve fermentorech s hork\u00fdmi roztoky kaustick\u00e9 sody (NaOH), aby se miner\u00e1ly obsahuj\u00edc\u00ed hlin\u00edk - gibbsit, bohmit a diaspory - rozpustily v p\u0159esycen\u00e9m roztoku hlinitanu sodn\u00e9ho zn\u00e1m\u00e9m jako pregnantn\u00ed louh. Reaktivn\u00ed oxid k\u0159emi\u010dit\u00fd p\u0159\u00edtomn\u00fd v roztoku mus\u00ed b\u00fdt tak\u00e9 odstran\u011bn dal\u0161\u00edm zpracov\u00e1n\u00edm, aby se vytvo\u0159ila suspenze \u010derven\u00e9ho bahna, ozna\u010dovan\u00e1 tak\u00e9 jako \"hlinit\u00fd kal\", p\u0159edt\u00edm, ne\u017e se p\u0159e\u010derp\u00e1 do uzav\u0159en\u00fdch p\u0159ehrad, kter\u00e9 obsahuj\u00ed nepropustn\u00e9 materi\u00e1ly, aby se zabr\u00e1nilo \u00faniku a kontaminaci okoln\u00edho prost\u0159ed\u00ed.<\/p>\n
Reduk\u010dn\u00ed hrnce kombinuj\u00ed oxid hlinit\u00fd (s trochou zbytk\u016f \u017e\u00edrav\u00e9 sody) s uhl\u00edkem, \u010d\u00edm\u017e vznik\u00e1 roztaven\u00fd elektrolyt, kter\u00fdm proch\u00e1z\u00ed elektrick\u00fd proud, \u010d\u00edm\u017e se rozb\u00edj\u00ed chemick\u00e9 vazby mezi hlin\u00edkem a kysl\u00edkem v oxidu hlinit\u00e9m, a t\u00edm se uvol\u0148uje kysl\u00edk, p\u0159i\u010dem\u017e hlin\u00edk se nakonec usazuje na dn\u011b jako anodov\u00fd kov, zat\u00edmco plynn\u00fd oxid uhli\u010dit\u00fd stoup\u00e1 vzh\u016fru jako katodov\u00fd kov.<\/p>\n
Ve vysok\u00fdch sr\u00e1\u017eec\u00edch n\u00e1dob\u00e1ch se roztok hydr\u00e1tu oxidu hlinit\u00e9ho d\u00e1le odd\u011bluje od kaustick\u00e9 sody p\u0159id\u00e1n\u00edm mal\u00e9ho mno\u017estv\u00ed jemn\u00e9ho krystalick\u00e9ho pr\u00e1\u0161kov\u00e9ho oxidu hlinit\u00e9ho do kapaln\u00e9ho roztoku, co\u017e zp\u016fsob\u00ed jeho vysr\u00e1\u017een\u00ed ve form\u011b tvrd\u00e9ho hlinitok\u0159emi\u010dit\u00e9ho hydr\u00e1tu oxidu hlinit\u00e9ho, kter\u00fd lze pot\u00e9 filtrovat, prom\u00fdvat a su\u0161it do formy b\u00edl\u00e9ho pr\u00e1\u0161ku zn\u00e1m\u00e9ho jako \"kalcinovan\u00fd oxid hlinit\u00fd\".<\/p>\n
Tento pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd lze tvarovat do r\u016fzn\u00fdch v\u00fdrobk\u016f r\u016fzn\u00fdmi technikami - nap\u0159\u00edklad such\u00fdm, izostatick\u00fdm a hork\u00fdm lisov\u00e1n\u00edm, odl\u00e9v\u00e1n\u00edm do skluzavky nebo odl\u00e9v\u00e1n\u00edm do p\u00e1sky - s p\u0159id\u00e1n\u00edm nebo bez p\u0159id\u00e1n\u00ed dal\u0161\u00edch materi\u00e1l\u016f (pojiv nebo termoplast\u016f) pro usnadn\u011bn\u00ed v\u00fdroby a v\u00fdrobn\u00edch proces\u016f, jako je vst\u0159ikov\u00e1n\u00ed nebo v\u00fdroba tenk\u00fdch substr\u00e1t\u016f pro mikroelektronick\u00e9 obvody. Jeho pou\u017eit\u00ed jako plniva nav\u00edc pom\u00e1h\u00e1 zlep\u0161it izola\u010dn\u00ed vlastnosti keramiky.<\/p>\n
Zbytky bauxitu lze d\u00e1le zpracov\u00e1vat kalcinac\u00ed, kter\u00e1 spo\u010d\u00edv\u00e1 v tom, \u017ee se vlo\u017e\u00ed do rota\u010dn\u00ed pece, kde se vystav\u00ed vysok\u00fdm teplot\u00e1m, aby se z nich odstranila ve\u0161ker\u00e1 zb\u00fdvaj\u00edc\u00ed voda a chemicky v\u00e1zan\u00e9 prvky, \u010d\u00edm\u017e vznikne pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd, kter\u00fd je vhodn\u00fd pro tvarov\u00e1n\u00ed do tvar\u016f nebo pou\u017eit\u00ed jako surovina v keramick\u00fdch aplikac\u00edch.<\/p>\n
Tepeln\u00e9 reakce jsou katalyzov\u00e1ny horkou kaustickou sodou (NaOH). Reaktanty s r\u016fzn\u00fdm slo\u017een\u00edm - nap\u0159\u00edklad kombinace diasporu a gibsitu - mohou b\u00fdt tak\u00e9 p\u0159id\u00e1v\u00e1ny za \u00fa\u010delem kontroly teplotn\u00edch profil\u016f a v\u00fdroby r\u016fzn\u00fdch druh\u016f oxidu hlinit\u00e9ho.<\/p>\n
Zat\u00edmco v\u011bt\u0161ina produkce oxidu hlinit\u00e9ho sm\u011b\u0159uje do odv\u011btv\u00ed taven\u00ed hlin\u00edku, existuje v\u00fdznamn\u00fd trh se speci\u00e1ln\u00edmi hlin\u00edky pou\u017e\u00edvan\u00fdmi jako \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly a technick\u00e1 keramika. Tyto speci\u00e1ln\u00ed v\u00fdrobky se vyzna\u010duj\u00ed jemnou krystalickou strukturou s velmi vysok\u00fdm specifick\u00fdm povrchem, kter\u00fd odol\u00e1v\u00e1 korozivn\u00edmu napaden\u00ed; nav\u00edc maj\u00ed izola\u010dn\u00ed vlastnosti, vysokou pevnost a tepelnou stabilitu, co\u017e z nich \u010din\u00ed neoceniteln\u00e9 sou\u010d\u00e1sti projekt\u016f v\u00fdstavby pec\u00ed.<\/p>\n
Mezi dal\u0161\u00ed vyu\u017eit\u00ed oxidu hlinit\u00e9ho pat\u0159\u00ed v\u00fdroba keramiky, jako jsou \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly, brusiva a nosi\u010de katalyz\u00e1tor\u016f. \u010casto mohou b\u00fdt sou\u010d\u00e1st\u00ed pr\u00e1\u0161ku i pojiva; nap\u0159\u00edklad termoplasty pro vst\u0159ikovan\u00e9 d\u00edly se zah\u0159\u00edvaj\u00ed a m\u00eds\u00ed s oxidem hlinit\u00fdm p\u0159edt\u00edm, ne\u017e se vyp\u00e1l\u00ed b\u011bhem procesu chlazen\u00ed. Jin\u00e9 pou\u017eit\u00ed p\u00e1skov\u00e9ho odlitku zahrnuje jeho sm\u00edch\u00e1n\u00ed s organickou kapalinou pro v\u00fdrobu tenk\u00fdch substr\u00e1t\u016f pro mikroelektronick\u00e9 obvody.<\/p>\n
Na rozd\u00edl od jin\u00fdch keramick\u00fdch materi\u00e1l\u016f, kter\u00e9 b\u00fdvaj\u00ed m\u011bkk\u00e9 a k\u0159ehk\u00e9, a proto nemohou odol\u00e1vat r\u00e1zov\u00e9mu nebo tahov\u00e9mu nam\u00e1h\u00e1n\u00ed v provozu, je oxid hlinit\u00fd tvrd\u00fd, odoln\u00fd a m\u00e1 n\u00edzk\u00fd koeficient rozta\u017enosti - ide\u00e1ln\u00ed vlastnosti pro lo\u017eiska a t\u011bsn\u011bn\u00ed. Bohu\u017eel jeho jemn\u00e1 struktura m\u016f\u017ee v\u00e9st k oslabuj\u00edc\u00edm vad\u00e1m, jako je prask\u00e1n\u00ed a rozpad, pokud je vystaven r\u00e1zov\u00e9mu nam\u00e1h\u00e1n\u00ed nebo nadm\u011brn\u00e9mu tahov\u00e9mu nam\u00e1h\u00e1n\u00ed.<\/p>\n
Kalcinace je pr\u016fmyslov\u00e1 metoda zah\u0159\u00edv\u00e1n\u00ed, kter\u00e1 se pou\u017e\u00edv\u00e1 k dosa\u017een\u00ed chemick\u00e9 separace pevn\u00fdch materi\u00e1l\u016f odpa\u0159ov\u00e1n\u00edm vody, odpa\u0159ov\u00e1n\u00edm zne\u010di\u0161\u0165uj\u00edc\u00edch l\u00e1tek a rozkladem oxiduj\u00edc\u00edch \u010d\u00e1st\u00ed hmoty. Kalcinace se ji\u017e dlouho pou\u017e\u00edv\u00e1 jako \u00fa\u010dinn\u00fd zp\u016fsob v\u00fdroby bezvod\u00e9ho oxidu hlinit\u00e9ho, v\u00fdroby obkladov\u00fdch desek ze s\u00e1drov\u00fdch odpadn\u00edch materi\u00e1l\u016f, extrakce vysoce \u010dist\u00e9ho rutilu z anatasu pro v\u00fdrobu vysoce \u010dist\u00e9ho rutilu, jako\u017e i pro dal\u0161\u00ed pr\u016fmyslov\u00e9 \u00fa\u010dely.<\/p>","protected":false},"excerpt":{"rendered":"
Bauxit je prim\u00e1rn\u00ed surovinou pou\u017e\u00edvanou k v\u00fdrob\u011b hlin\u00edku. Tento j\u00edlovit\u00fd miner\u00e1l se skl\u00e1d\u00e1 z alu-hydroxid\u016f, jako je gibbsit, boehmit a [...]<\/p>","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":"","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":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","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":[3],"tags":[],"class_list":["post-671","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/671","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/comments?post=671"}],"version-history":[{"count":1,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/671\/revisions"}],"predecessor-version":[{"id":672,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/671\/revisions\/672"}],"wp:attachment":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/media?parent=671"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/categories?post=671"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/tags?post=671"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}