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Raziskave uporabnosti boksita in surove gline Brežice pri izdelavi mulitnih opek
Kejžar, Rajko
Mulitne opeke spadajo v grupo visokogliničnih ognjeodpornih opek, ki so dobro odporne proti kombiniranim korozijskim mehanskim in temperaturnim obremenitvam. Kot osnovne surovine za izdelavo teh opek ...smo uporabili sintetičen mulit (pripravili smo ga iz boksida in gline), sortirane šamotne odpadke in vezivno glino. Pri izdelavi sintetičnega mulita in mulitnih opek morajo biti vse surovine fino zmlete, ker le na ta način dobimo veliko stično površino med glino in boksitom. Od njene velikosti je namreč v veliki meri odvisna intenzivnost kemičnih reakcij - nastajanje mulita in tvorba steklaste faze (sintranje). Mulitne opeke, izdelane iz sintetičnega mulita (pripravljen iz boksita Gvajana in surove gline Brežice z žganjem na 1400 stopinj Celzija), oblikovane pod pritiskom vsaj 400 kp/cm2 in žgane odvisno od sestave mulitne mase v temp. območju od 1400 do 1500 stopinj Celzija, imajo odlične fizikalno kemične lastnosti. Uporabljamo jih lahko za obzidavo korozijsko, mehansko in temperaturno obremenjenih delov peči.
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