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Study of titanomagnetite sands from Costa Rica
JOSE ANDRES MATUTES AQUINO
Acceso Abierto
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Titanomagnetite minerals
Microstructure
In Cahuita town, Limon province, at the Atlantic coast of Costa Rica there are titanomagnetite sands. The chemical, structural and magnetic characterization of the titanomagnetite sands can clarify aspects of their geological formation; as well as suggest applications from them. The magnetic sand is composed mainly of titanomagnetite and hematite, with very small quartz impurities quantities, pyroxene, etc. The refinement of X-rays diffraction patterns by the method of Rietveld indicates an 86.03% in weight of titanomagnetite and a 13.97% in weight of hematite. The particles size of this magnetic sand have an interval of 75–300m and a specific surface area of 1.18m2/g. The specific magnetization of the saturation of the sand is 55.8 emu/g and the intrinsic coercivity is 39.6 Oe. In this work a characterization of the titanomagnetite sands is presented the chemical composition was determined by absorption spectroscopy. The present crystalline phases were determined by X-ray diffraction. The morphology and composition of the particles were determined by scanning electron microscopy together with microanalytical techniques. The classification of the particles by shape and color were carried out using optical microscopy. The magnetic properties and the hyperfine structure were measured by vibrating sample magnetometry and Mössbauer spectroscopy.
2003
Artículo
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