![]() ( 2007) experimented with the same approach in an underground driving rock tunnel. ( 2016) proposed a green biocompatible approach (i.e., ionized water stemming) to reduce the toxic gases and dust caused by the blasting in surface mining. ( 2019a, b) studied the diffusion process of blasting dust from mines using numerical simulation. Many studies have been performed to control mine blasting dust in recent years. 2018), but also pollute atmospheric environment (Csavina et al. Those fine particulates not only can increase the prevalence of pneumoconiosis in mineworkers (Petavratzi et al. 2018), although it produces massive emissions of fine particles and toxic gases (Akbari et al. This study is significant to understand the effects of physicochemical properties of copper mine blasting dust on its wettability.īlasting remains one of the most widely used methods in open-pit mines worldwide (Singh et al. The identical mineral compositions were detected in HLBD and HBBD by X-rays diffraction (XRD) however, the surface organic hydrophobic component of HBBD is slightly larger than that of HLBD, this may be the reason for the poor wettability of HBBD. The pore structure of HBBD is more developed, and the total pore volume of HBBD is 1.66 times larger than that of HLBD. Specifically, particle size of HBBD is smaller than that of HLBD, and their respiratory dust (less than 10 µm) accounts for 61.74 vol% and 53.00 vol%, respectively. The results show that particle size and pore structure of the blasting dust are the main factors affecting its wettability. The properties included particle size distributions (PSDs), micromorphologies, pore structures, mineral components and surface organic carbon functional groups. The physicochemical properties of HLBD and HBBD were measured and compared with each other. « lessĬopper- and silver-zirconia aerogels containing 10 at% IB metal were prepared from tetra-n-butoxy zirconium(IV) and IB metal acetates using the solution sol-gel method and ensuring high-temperature (HT) and low-temperature (LT) supercritical drying, respectively.To investigate the factors affecting the wettability of copper mine blasting dust, the primary blasting dust was collected from an open-pit copper mine and separated into hydrophilic blasting dust (HLBD) and hydrophobic blasting dust (HBBD) using water flotation method. The optical bandgap decreases with increasing x, which is due to the emergence of Cu-d states at Fermi-level near the valence bands, thus making Cu-doped zirconia a hole doped (p-type) semiconductor. This magnetic analysis confirms the findings from x-ray diffraction that only a part of Cu is successfully doped into cubic phase of Cu-doped ZrO 2. The temperature dependence of magnetic susceptibility measurements from 2 K to 300 K exhibits Curie–Weiss behaviour whose analysis using g a = 2.1 and spin S = 1/2 yields x = 0.028 and x = 0.068 for the nominal x = 0.05 and x = 0.20 samples, respectively. Electron magnetic resonance studies provide evidence for the substitution of Cu 2+ ( 2D 5/9,3d 9) ions at Zr 4+ sites with g ∥ = 2.250, g ⊥ = 2.018 and average g a = (g ∥ + 2g ⊥)/3 ~ 2.1. At x = 0.05 and 500 ☌ calcination temperature, we observe a high degree of cubic crystallinity which breaks down into monoclinic phase with increasing calcination temperature beyond 550 ☌. For $$x x_c$$, the monoclinic CuO emerges as a secondary phase with shrinkage of unit-cell volume with increasing the Cu content. Thermal analysis and kinetics of crystallization revealed that the cubic phase at ambient temperature can be stabilized by using a critical calcination temperature of 500 ☌ for 8 h in air and a critical composition of $$x_c$$ = 0.10 ± 0.05. Various compositions of Zr 1– xCu xO 2 (0.01 ≤ x ≤ 0.25) nanocrystallites of average size ~16 nm were synthesized using co-precipitation technique. « lessīy means of experimental and ab initio investigations, in this article we report on the cubic phase stability of Cu doped zirconia (ZrO 2) at room temperature, and further characterize its structural, optical and magnetic properties. Recently, highly active CO solid solution phase. ![]()
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