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Natural Zeolites from Ethiopia for elimination of Fluoride

AuthorsDíaz Carretero, Isabel ; Chebude, Yonas; Asrat, A.; Tadesse, Serkalem; Gómez-Hortigüela Sainz, Luis ; Pérez Pariente, Joaquín
Issue Date5-Feb-2013
CitationGeoGen2013 (2013)
AbstractFluorine contamination in the Rift Valley area, in south Ethiopia is a national problem that requires attention at all country levels. In this context, the Ethiopian Government has shownits determination to support any initiative to help in the potabilisation and sanitation of the waters in this area. Zeolites are a vast natural resource in Ethiopia that remains unexploited due to lack of scientific knowledge and available manpower with a geology background and means to initiate the systematic exploitation of this resource. Natural zeolites have a volcanic origin; they belong to the family of hydrated aluminosilicates and have a microporous structure that can accommodate a wide variety of cations such as sodium, calcium, potassium and magnesium. These cations can easily be exchanged by others in what is one of the main applications of this kind of minerals: ionic exchange. The main objective of this work is to test the potential use of the naturally occurring zeolites of the country in fluoride extraction from water in the Rift Valley area and assess the possibility of constructing sanitation plants based on this zeolite technology. Preliminary results will be presented in the congress. Moreover, the project includes different tapies related to the sustainab le development of the country. One of the objectives is to construct a database with the location, characterisation, potential uses and economic evaluation of the different zeolite deposits within the Rift Valley area. Particularly, the characterisation will include data on phase purity, chemical composition and morphology. The potential use will be assessed by testing the ability of the zeolites to act as fluoride ion adsorbents. Most importantly, a big amount of effort will concentrate in the divulgation of these databases to catalyse the widespread utilisation of this knowledge by local industrial and any other potential beneficiaries. The first set of natural zeolites from Ethiopia consists in ten samples that have been fully characterized via powder X-Ray diffraction, scanning electron microscopy, and elemental analysis. Despite sorne of the samples studied are quartz, mixtures or even other types of feldspars, ali of them have been grained and tested raw in the elimination of fluoride. The results are collected in Figure 1.
DescriptionTrabajo presentado en GeoGen2013, celebrado en Adís Abeba (Etiopía) del 5 al 7 de febrero de 2013.
Appears in Collections:(ICP) Comunicaciones congresos
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