Caracterización mineralógica de bentonitas del Source Clay Repository

1. A. Lorenzo ¹
2. A. García-Vicente ¹
3. J. Morales ¹
4. E. García-Romero ²
5. M. Súarez ¹

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Abstract

Four bentonite samples from Source Clay Repository have been characterized to know their mineralogical composition and to be able to compare them. For that purpose, two different analytical techniques have been used: X-ray diffraction (DRX) and VNIR-SWIR spectroscopy. Both techniques indicate that all samples are very pure, and that APA and COU(V) samples have a very small amount of quartz impurities. They have also allowed us to discriminate between dioctahedrical samples (APA and SAN) and trioctahedrical samples (COU(V) and SHE. VNIR-SWIR spectroscopy shows the high resemblancebe- tween the two dioctahedral samples and evidences the clear difference between the two trioctahedral smectites: COU(V) and SHE. COU(V) becasue of its high content in Fe and Mg, and SHE (synthetic hectorite) due to the presence of Li that produces features clearly distinctive. This results indicate that the VNIR-SWIR spectroscopy is a usefull technique to identify smectites

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