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Caratterizzazione tecnologica di una Pb-clinoptilolite

Calia, Massimo (2011) Caratterizzazione tecnologica di una Pb-clinoptilolite. Doctoral Thesis.

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Abstract

A Sardinian clinoptilolite rich-rock was submitted to a mineral separation process aimed to increase zeolite content. The material enriched in zeolite was subjected to exchange processes in Na- and Pb- solutions, to conduct the clinoptilolite in Pb-form. The behaviour of the Pb-clinoptilolite was studied measuring the Pb2+ release in 0.5 M NaCH3COO solution at 20°C. This release was compared with lead releases of the same material heated at 200, 300, 400, 500, 600, 675, 700, 800, and 900°C. The rehydration capacity (R.C.) after heating was also evaluated. TG analyses were performed to evaluate the R.C. also after repeated heating-cooling cycles. XRPD results of unheated and heated materials were related with R.C. and lead releases results. The Pb-clinoptilolite was characterized also by means of DTA analyses. The ternary system SiO2-Al2O3-PbO was used to explain the transformations recorded at temperatures higher than 700°C, keeping in consideration DTA and XRPD results.

Item Type:Doctoral Thesis
ID Code:5114
Contributors:Cerri, Guido
Publisher:Universita' degli studi di Sassari
Uncontrolled Keywords:Clinoptilolite, zeolite, Pb-feldspar, cation exchange, thermal stability
Subjects:Area 04 - Scienze della terra > GEO/09 Georisorse minerarie e applicazioni mineralogico- petrografiche per l'ambiente ed i beni culturali
Divisions:001 Università di Sassari > 01 Dipartimenti > Zoologia e genetica evoluzionistica
Cicli, scuole e corsi:Ciclo 23 > Scuole > Scienze della natura e delle sue risorse > Scienza e tecnologia dei minerali e delle rocce di interesse industriale
Deposited On:01 Apr 2011 12:37

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