Wet comminution of zeolite in planetary ball mill

Cilj ovog rada bio je usitniti uzorak zeolita klinoptilolita do veličina manjih od mikrometra. Mikroniziranjem zeolita povećava mu se specifična površina, a time i adsorpcijski kapacitet i kapacitet ionske izmjene. Usitnjavanje je provedeno u planetarnom kugličnom mlinu pri različitim brojevima okretaja (300, 400 i 500 o/min) u vremenskim periodima od 10, 20, 30 i 60 minuta. Eksperimenti su provedeni u dvije različite posude mlina pri 500 o/min. Raspodjela veličina čestica određena je metodom laserske difrakcije. Prema dobivenim rezultatima vidljivo je da je usitnjavanjem pri većem broju okretaja i u dužem vremenskom periodu dobiven veći udio manjih čestica. Raspodjela veličina čestica izražena je Sauterovim promjerom. Specifična površina određena je snimanjem adsorpcijsko-desorpcijskih izotermi dušika. Povećavanjem vremena usitnjavanja specifična površina se smanjila zbog narušavanja mikroporozne strukture zeolita.The aim of this work was comminution of the zeolite clinoptilolite to sizes smaller than a micrometer. Micronization increases specific surface area, adsorption capacity and ion exchange capacity of zeolite. Comminution was performed in planetary ball mill at different rotation speed (300, 400 and 500 rpm) at intervals of 10, 20, 30 and 60 minutes. The experiment was conducted in two different grinding pots at 500 rpm. The particle size distribution was determined with laser diffraction method. The results show that the comminution at high rotation speed and over a longer period obtained higher proportion of smaller particles. Particle size distribution was expressed with Sauter diameter. The specific surface area was calculated from the adsorption-desorption isotherms of nitrogen. Specific surface area is reduced increasing the time of comminution, due to the disruption of microporous structure of the zeolite