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

Effects of mechanical activation on the structural changes and microstructural characteristics of the components of ferruginous quartzite beneficiation tailings

“…This agrees with the observations of Pourghahramani and Forssberg, Kaczmarek and Ninham, and Stewart et al [10,25,26].…”

“…These results can be explained by the breaking of hematite, magnetite, and dolomite intergrowths in the composition of iron ore tailings. At the same time, the experiments with high-purity hematite [10] showed that after 9 h of milling in the planetary mill, 85% of the initial hematite was converted into amorphous phase. Similar results were obtained after 10 h of milling of hematite powder whose degree of crystallinity ranged from 9.37% to 49.8% [23].…”

“…Although a substantial difference was found in the particle size after 1, 2, 6, and 12 h of milling, intensive grinding Note: a D10 is the particle size at which 10% of the particles are finer; D50 is the grain size at which 50% of the particles are finer; D90 is the particle size at which 90% of the particles are finer. of high purity hematite in the planetary mill after 3 and 9 h of milling produced no differences in the particle size grain [10]. This effect was probably a result of the formation of agglomerates during extended milling of different minerals [11][12][13][14], which appears to have been eliminated in the experiments conducted using wet milling in an aqueous medium and an ultrasonic bath.…”

“…This effect was probably a result of the formation of agglomerates during extended milling of different minerals [11][12][13][14], which appears to have been eliminated in the experiments conducted using wet milling in an aqueous medium and an ultrasonic bath. While it is widely recognized that comminution can lead to changes in particle shape, relatively few attempts have been made to quantify the parameters of ground minerals and ores as they relate to comminution processes [10]. To characterize the shape of particles produced by milling of ferruginous quartzite tailings, this study applied one of the main shape descriptors such as elongation, the values of which are shown in Table 2.…”

Impact of mechanochemical effect on chalcopyrite leaching

“…The XRD patterns of the samples were recorded in the range 2θ = 10-70 0 using a step size of 0.043 0 and a counting time of 107.4 s/step. Peak positions (2θ) and the full-width at half maximum (FWHM) area under peak (A) were obtained from the XRD spectra to characterize the microstructure such as crystallite size, D m using Scherrer equation, lattice strain, and degree of crystallinity (DOC), as shown in Equations 1 -3 respectively (Arbain et al, 2011;Pourghahramani and Forssberg, 2006a). The APD Version 4.1 g software was used to obtain these parameters, of which the (112), (204) and (312) planes were selected for the profile analysis (Palaniandy and Jamil, 2009).…”