The effects of fine grinding on the physicochemical properties and thermal behavior of bentonite clay

• Published in: Journal of the Serbian Chemical Society Vol. 67; no. 11; pp. 753 - 760
• Main Authors: Filipovic-Petrovic, Leposava, Kostic-Gvozdenovic, Ljiljana, Eric-Antonic, Stanka
• Format: Journal Article
• Language: English
• Published: Serbian Chemical Society 01.01.2002
• Subjects: bentonite clay; grinding; properties
• ISSN: 0352-5139; 1820-7421
• DOI: 10.2298/JSC0211753F

In this study, the results obtained by the mechanical treatment of bentonite clay Zavidinci, Serbia in a laboratory vibration mill with rings for different periods of time are presented. The successive structural changes of the minerals were studied by X-ray diffraction analysis, DTA analysis, IR spectroscopy and particle size distribution. The reactivity changes were controlled by CEC. The starting material and the material mechanically treated for 30 min were sintered at several temperature and for different time periods examined by X-ray diffraction. Mechanical treatment by fine grinding of bentonite clay produces structural changes of the powdered material and influences its behavior in further processing steps in particular after thermal treatment. U ovom radu su predstavljeni rezultati koji su dobijeni mehanickim tretmanom bentonitske gline Zavidinci, Srbija, u vibro mlinu sa prstenovima i razlicitim vremenskim periodima mlevenja. Promene u strukturi isptivane sirovine su pracene rendgenskom difrakcijom, DTA analizom, IR spektroskopijom, raspodelom velicine cestica, a promene reaktivnosti su pracene kontrolom kapaciteta katjonske razmene. Polazni ispitivani materijal i materijal mehanicki obradjen 30 minuta su toplotno tretirani na nekoliko temperatura i razlicitih vremena. Nakon toga su prouceni rendgenskom difrakcijom. Mehanicka obrada bentonitske gline, finim mlevenjem, dovodi do strukturnih promena u praskastom materijalu i utice na sledece procese prerade kao sto je termicki tretman.