Effects of grinding of the feldspar in the sintering using a planetary ball mill

Comparative study of microstructural characteristics and stored energy of mechanically activated hematite in different grinding environments

“…The decrease of the BET specific surface area during mechanical activation previously was reported for many minerals: gypsum (Zhang et al, 1996), chalcopyrite (Tkacova and Balaz, 1996), ilmenite (Welham and Llewellyn, 1998), tantalite (Welham, 2001), and feldspar (Cruz Sanchez et al, 2004). But our measurements do not agree with such trends.…”

Preservation of amorphous ultrafine material: A proposed proxy for slip during recent earthquakes on active faults

“…Sharp peaks in the XRD spectra of these mixtures were attributed to crystalline quartz and the internal standard (α-alumina), but wider, more subdued peaks were observed around 20–30° 2θ, indicating amorphous material2122, in samples with smaller quartz contents (Supplementary Figure 2a). Most silicate minerals, such as feldspar, show similar broad bump in their amorphous state23. After subtracting the crystalline peaks and the background curve from the XRD patterns by using multivariate analysis (with expressions for position, height and width of crystalline peaks and the background curve), we found the integral intensities of the amorphous peaks to be inversely proportional to the weight fraction of crystalline components (Fig.…”

Mechanochemistry of silica on jet milling

“…increase disintegration time and dissolution rate of pharmaceutical products, production of porous minerals, increase the reactivity of cementitious waste materials, reduction in phase transformation temperature, enhance leaching process, decrease thermal decomposition temperature and increase in particle reactivity (Venkataraman and Narayanan, 1998;Begin-Colin et al, 1999;Kanno, 1985;Terada and Yonemochi, 2004;Hu et al, 2003;Benezet and Benhassainne, 1999;Fernandez-Bertran, 1999;Gonzalez et al, 2000;Zhang et al, 1996;Ryau, 2004;Kano et al, 2000;Yang et al, 2005;Sanchez et al, 2004;Wu et al, 1996;Al-Wakeel, 2005).…”