Mineralogical Characteristics and Cationic Exchange Properties of a Zeolite Mineral from Romana, NW Sardinia, Italy     

Maria L. Fercia    Roberto Lonis    Roberto Peretti    Antonio Sau    Antonello Serci    Antonio Zucca 《Resource Geology》2009,59(1):15-24

An investigation was conducted into the Tertiary ignimbrite formations in the Romana area in NW Sardinia. Scanning electron microscopy–energy-dispersive spectrometry indicated the presence of clinoptilolite and subordinate smectite, quartz, mordenite and calcite. Laboratory analyses of representative samples collected from the deposit indicated a cation exchange capacity ranging from 85 to 135 mEq per 100 g. Ion exchange experiments conducted in flasks containing different initial cation concentrations and in columns supplied with solution having constant cation concentration, showed different selectivity towards the cations examined, in the order: NH₄⁺> Pb²⁺> Cd²⁺> Cu²⁺> Zn²⁺> Mn²⁺> Ni²⁺. Compared to the untreated material, under the experimental conditions used and considering the eluate, and the Italian regulatory limits for discharge into surface waters, the zeolite treated with a 1-N NaCl solution yielded a 1.3–5-fold increase in the volume of treated water, depending on the cation examined. The experimental results obtained show that the cationic exchange properties of the zeolite rock from the Romana deposit are comparable with the average quality of zeolites currently imported into Italy from non-European countries.  相似文献   

High-silica zeolites in pyroclastic flows from Central Sardinia (Italy): clues on genetic processes and reserves from a mineralogical study     

Mormone  Angela  Ghiara  Maria Rosaria  Balassone  Giuseppina  Piochi  Monica  Lonis  Roberto  Rossi  Manuela 《Mineralogy and Petrology》2018,112(6):767-788

Mineralogy and Petrology - The island of Sardinia (Italy) presents some of the most interesting zeolite ores in Europe, most of which are associated with old pyroclastic deposits. In particular,...  相似文献