Mineralogical and thermal characterization of borate minerals from Rio Grande deposit, Uyuni (Bolivia)

Abstract

Peer ReviewedPreprin

Catalytic paper made from ceramic fibres and natural ulexite. Application to diesel particulate removal

“…4a) occurs at temperatures <165 . As reported by Garcia-Valles et al [13], the position of this peak is affected by NaCl content. In the case of untreated pure ulexite, the thermal evolutions observed are the same as those previously described, though water loss steps at low temperatures are better defined (Fig.…”

“…In most outcrops other minerals, mainly halite (NaCl) and gypsum (CaSO 4 Á2H 2 O) also occur [13]. In addition, if polyborate anions are regarded as consisting of various BO 3 planar triangles and BO 4 tetrahedrons [25], borates containing different numbers of B atoms can be found (pentaborates, tetraborates, triborates, etc.).…”

“…Also, the presence of NaCl is evidenced according to XRF results. After the elutriation process, structural changes occur, which involve the loss of water and the appearance of less crystalline phases [13].…”

“…Borate minerals are the main source of boron and have a multitude of industrial applications. Within a range of over 160 species of borate minerals, ulexite is one of the most important in commercial terms [13]. Ca,Na-borate minerals are mainly used for fibreglass making and also for the production of ceramics and ceramic glazes [14,15].…”