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Abstract  

In this study, the zeolitic tuffs having clinoptilolite obtained from Bigadic region of western of Anatolia, Turkey were investigated as regards to whether it is possible to be transformed into amorphous phase from them. At first, the zeolite tuffs rich in clinoptilolite were characterized using XRD, DTA, TG, DSC, and FTIR standard methods. All the samples were heated at 110 °C for 2 h and then were expanded within 5 min between the temperatures 1200 and 1400 °C. In addition, porosity and density were determined. The resistance values of all the samples were measured in acidic and basic media. These samples were also analyzed. As a result of this study, zeolitic tuffs in clinoptilolite were transformed into amorphous phase, and especially in chemical industry were found convenient.

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Abstract  

The adsorption kinetics of H2O in a clinoptilolite rich zeolitic tuff was experimentally investigated at 18°C. In the identification of the diffusion mechanism the isothermal adsorption model equation was used. It was found out that the intraparticle mass transfer becomes more dominant over the heat transfer with increase in particle size and the adsorptive dose pressure. Although initially intraparticle mass transfer was the controlling resistance later external heat transfer also contributes to the transfer mechanism.

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Abstract

The Tokaj Mts, situated in the northeastern part of the inner arc of the Carpathians, forms a part of a Miocene calc-alkaline andesitic-dacitic-rhyolitic volcanic island arc. The ancient volcanic structures were reconstructed on the basis of the 1:50 000-scale and 22 sheets of the 1:25 000-scale geologicpetrologic maps, as well as the revision of the volcanic facies in 150 boreholes. Multispectral and SAR satellite imagery, aerial photos, data and maps of airborne geophysical surveys (magnetic and radiometric), gravity-filtered anomaly maps, geochemical (soil and stream sediment Au, As, Sb, Hg) concentration distribution maps and the K/Ar dating of 132 samples from 80 paleomagnetic measurements were also used.

The anomalies were only taken into consideration in the interpretation if the coincident results of at least 3 methods indicated the presence of any volcanic structure. In consequence, 91 map-scale volcanic structures were identified by morphology — complex calderas, single lava domes, volcanic fissures, subvolcanic intrusions, diatremes, stratovolcanoes and postvolcanic formations. Conclusions were also drawn regarding the link to the volcanic structures and prospective occurrences of the mineral resources of the Tokaj Mts: andesite, dacite, welded zeolitic tuff, K-metasomatite, perlite, pitchstone, pumice, bentonitic, illitic, kaolinitic, diatom-bearing and silicified lacustrine sediments, hydrothermal Au-Ag and Pb-Zn veins, and Hg stockwerks.

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. Ghrair, A., Ingwersen, J. & Streck, T., 2008. Immobilization of heavy metals in soil using nanoparticles produced from zeolitic tuff. In: Book of Abstracts, Eurosoil 2008, Vienna, 25–29 August, 2008. (Eds.: Blum, W. E. H., Gerzabek, M. H. & Vodrazka, M

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Agrokémia és Talajtan
Authors: János Kátai, Anita Jakab, Zsolt Sándor, Ágnes Zsuposné Oláh, and Magdolna Tállai

. & Streck, T., 2008. Immobilization of heavy metals in soil using nanoparticles produced from zeolitic tuff. In: Book of Abstracts, Eurosoil 2008 (Vienna, August 25–29). Soil-Society-Environment. (Eds.: Blum, W. E. H., Gerzabek, M. H. & Vodrazka, M.) 211

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Journal of Thermal Analysis and Calorimetry
Authors: Mihaela-Ligia Ungureşan, Andrada Măicăneanu, Francisc-Vasile Dulf, Eva-Henrietta Dulf, and Delia Maria Gligor

metal ions is higher), washed with distilled water to remove fine particles and treated with NaCl 1 M (pH = 10) to obtain sodium form which proved to be more efficient in the ionic exchange process [ 13 , 14 ]. After the alkaline treatment, zeolitic

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.1016/0040-6031(82)87142-6 . 8. Yörükoğulları , E , Yılmaz , G , Dikmen , S . Thermal treatment of zeolitic tuff . J Therm Anal Calorim . 2010 ; 100 : 925 – 928 . 10.1007/s10973-009-0503-8 . 9

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properties of MnNb 2 O 6 . J Therm Anal Calorim . 101 : 45 – 47 10.1007/s10973-010-0783-z . 10. Yörükoğulları , E , Yılmaz , G , Dikmen , S . 2010 . Thermal treatment of zeolitic tuff

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-2449(86)80010-0 . 13. Yörükoğulları , E , Yılmaz , G , Dikmen , S 2010 Thermal treatment of zeolitic tuff . J Therm Anal Calorim 100 : 925 – 928 10.1007/s10973-009-0503-8 . 14

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E , Yilmaz G , Dikmen S . Thermal treatment of zeolitic tuff . J Therm Anal Calorim . 2010 . 10.1007/s10973-009-0503-8 . 26. Majda , D , Makowski , W . Studies on

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