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Solvent leaching has a number of routes (Fig.3) [6]. The organic extractant phase can be brought into direct contact with the solid material; this approach is called “direct solid leaching.” The solid can be a crushed and grinded ore, but it can also be a fine-grained industrial proc...
The tetraethylorthosilicate (TEOS, 98%), titanium (IV) butoxide (97%) and niobium (V) pentachloride (99%) were purchased from Sigma-Aldrich (Saint Louis, MO, USA). Ethanol (99.8%), HCl (37% v/v) and HNO3(95% v/v) were purchased from Vetec (Duque de Caxias, RJ, Brazil). Ultra...