【摘 要】
：
The present study initially investigates the kinetics of microwave-assisted grinding and flotation in a porphyry copper deposit. Kinetic tests were conducted on untreated and microwave-irradiated samples by varying the exposure time from 15 to 150 s. Opti
【机 构】
：
Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran 15875
【出 处】
：
International Journal of Minerals, Metallurgy and Materials
论文部分内容阅读
The present study initially investigates the kinetics of microwave-assisted grinding and flotation in a porphyry copper deposit. Kinetic tests were conducted on untreated and microwave-irradiated samples by varying the exposure time from 15 to 150 s. Optical microscopy, energy-dispersive X-ray spectroscopy, and scanning electron microscopy were conducted to determine the mineral liberation and particle surface properties, and to perform mineralogical analyses. Results showed that the ore breakage rate constant monotonically increased by increasing the exposure time, particularly for the coarsest fraction size (400 µm) due to the creation of thermal stress fractures alongside grain boundaries. Excessive irradiation time (>60 s) led to the creation of oxidized and porous surfaces along with a dramatic change in particle morphologies that result in a substantial reduction of chalcopyrite and pyrite flotation rate constants and ultimate recoveries. We concluded that MW-pretreated copper ore was ground faster than the untreated variety, but the two types have slightly similar floatabilities.
其他文献
Nanoparticles of potassium ferrite (KFeO2) in this work were synthesized by a simple egg white solution method upon calcination in air at 773, 873, and 973 K for 2 h. The effects of calcination temperature on the structural and magnetic properties of the
The optimized growth parameters of graphene with different morphologies, such as dendrites, rectangle, and hexagon, have been ob-tained by low-pressure chemical vapor deposition on polycrystalline copper substrates. The evolution of fractal graphene, whic
This study explores the fabrication of Fe-based amorphous/crystalline coating by air plasma spraying and its dependency on the coating parameters (plasma power, primary gas flow rate, powder feed rate, and stand-off distance). X-ray diffraction of the coa
Layered double hydroxides (LDHs) hinder corrosive elements by forming a double layer and locking them between its layers. Hence, LDHs are interesting materials in corrosion inhibition. In this work, Zn–Mg-based LDHs are grown over a copper substrate by us
In this study, Mg–9Al–1Si–1SiC (wt％) composites were processed by multi-pass equal-channel angular pressing (ECAP) at vari-ous temperatures, and their microstructure evolution and strengthening mechanism were explored. Results showed that the as-cast micr
The aim of this investigation was to prepare geopolymeric precursor from vanadium tailing (VT) by thermal activation and modific-ation. For activation, a homogeneous blend of VT and sodium hydroxide was calcinated at an elevated temperature and then modif
This paper presents an experimental investigation of the mechanical and tribological properties of Cu–graphene nanosheets (GN) nanocomposites. We employed the electroless coating process to coat GNs with Ag particles to avoid its reaction with Cu and the
To investigate the impact of an opening and joints with different inclination angles on the mechanical response behavior, the energy evolution characteristics, and distribution law of granite specimens, uniaxial loading tests were performed on the paralle
Radioluminescence (RL) behaviour of erbium-doped yttria nanoparticles (Y2O3:Er3+ NPs) which were produced by sol–gel method was reported for future scintillator applications. NPs with dopant rates of 1at％, 5at％, 10at％ and 20at％ Er were produced and calcin
Mica was used as a supporting matrix for composite phase change materials (PCMs) in this work because of its distinctive morpho-logy and structure. Composite PCMs were prepared using the vacuum impregnation method, in which mica served as the supporting m