Effect of sodium silicate on the magnetic separation of ilmenite from titanaugite by magnetite selective coating

Zhao, Xuan; Meng, Qingyou; Yuan, Zhulin; Zhang, Yunhai; Li, Lixia

doi:10.1016/j.powtec.2018.12.026

Cited by 40 publications

(11 citation statements)

References 35 publications

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“…According to Fig. 16, the potential zero charge (PZC) of magnetite and hematite in aqueous solution was found to about pH 5.5 and 5.0, respectively, which were in agreement with previous studies (Nan et al, 2019;Zhao et al, 2019). In deionized water, the zeta potential of magnetite and hematite was decreasing with the increasing of pulp pH that can be attributed to the adsorption of OHions on magnetite and hematite surface.…”

Section: Zeta Potential Analysessupporting

confidence: 89%

Investigations on a novel collector for anionic reverse flotation separation of quartz from iron ores

Ji¹,

Ge²,

Liu³

et al. 2020

Physicochem. Probl. Miner. Process.

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Section: Zeta Potential Analysessupporting

confidence: 89%

Investigations on a novel collector for anionic reverse flotation separation of quartz from iron ores

Ji¹,

Ge²,

Liu³

et al. 2020

Physicochem. Probl. Miner. Process.

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“…The combination of a silicate network and magnetic particles in the production of magnetic nanomaterials results in an increased surface area and enhances the porosity of the material, thus remarkably improving their performance (Kooti and Nasiri 2015;Perween and Ranjan 2017). When an external magnetic field is applied to a magnetic nanocomposite, the magnetic particles change their shape magnetostrictively to induce strain on the piezoelectric component, causing dielectric polarization (Zhao et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Nanoceramics and novel functionalized silicate-based magnetic nanocomposites as substitutional disinfectants for water and wastewater purification

Nahwary

Hemdan

Abia

2020

Environ Sci Pollut Res

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Herein, we successfully synthesized nano-porous Co 2 O 3 /Cu 2 O 3 : Al 2 O 3 : SiO 2 ((0, 5, 7, 9) Co-CAS) using the acidic sol-gel approach and calcined at 800°C for 4 h. The crystallization behavior and spectroscopic properties were investigated using X-ray diffraction, field emission-scanning electron microscopy, and Fourier-transform infrared absorption spectra analysis. The antibiotic properties of the nano-porous CAS, 5Co-CAS, and 9Co-CAS magnetic nanocomposites was studied against some potentially pathogenic bacteria in water and wastewater samples. The bacteria tested included Escherichia coli, Salmonella enterica, Pseudomonas aeruginosa, Listeria monocytogenes, Staphylococcus aureus, Enterococcus faecalis, and Bacillus subtilis. Incorporating Co 2 O 3 resulted in the identification of three peaks at 2θ = 10.2°, 13.4°, and 15°. The introduction of cobalt nanoparticles created a ferromagnetic behavior in the CAS nanoceramic, with the magnetic moment and saturation values increasing with increased Co 2 O 3 doping. 9Co-CAS was most potent against all the tested pathogens with minimum inhibitory concentrations of 25 mg/L within 40 min for E. coli and P. aeruginosa and 50 mg/L within 10 min for S. enterica; the lowest antibacterial activity was observed with the unmodified CAS. The findings revealed that the manufactured nanocomposite materials were potent disinfectants with a promising application for water and wastewater treatment.

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“…The interaction between microfine coal particles was analyzed on the basis of EDLVO theory. − Therefore, the total interaction energy ( V T ) was demonstrated by the following equation V normalT = V normalW + V normalE + V normalH + V normalS where the van der Waals force action energy ( V w , J) was determined by the Hamaker constant and radius of particles, as performed in eq ; the electrostatic repulsion energy ( V E , J) could be calculated in eqs 5–7, which was mainly determined by the charge potential and radius of the particles; the hydrophobic interaction energy ( V H , J) was determined by the acid–base free energy and radius of particles, and it was performed using eqs 8–12; and the steric hindrance energy ( V S , J), which could be obtained from eqs 13 and , was usually influenced by thickness of the adsorption layer and dispersant property V normalW = prefix− false( A 11 − A 22 false) 2 R 12 H where A 11 and A 22 are the Hamaker constants of coal particles and water in a vacuum, which equaled to 6.1 × 10 –20 and 3.7 × 10 –20 J, respectively; , R is expressed as the median size of microfine coal particles in the slurry, m ; and H is denoted as the distance between coal particles, nm. V normalE = π ε ε 0 R φ 2 ( ln true[ 1 + exp nobreak0em.25em⁡ false( <...…”

Section: Methodsmentioning

confidence: 99%

Insights into the Dispersion Mechanism of Microfine Coal Particles Modified with Naphthalene Sulfonate Formaldehyde Based on EDLVO Theory

et al. 2023

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Coal water slurry (CWS) fuel prepared using microfine coal particles with a size distribution of 1–10 μm is a promising way to cleanly utilize solid resources in engines, even catering a popular application for clean coal technology. In an attempt to address the problems in coal aggregation in microfine coal water slurry (MCWS), dispersants are used to improve the dispersing status of microfine coal particles. Based on the experimental results and extended Derjaguin–Landau–Verwey–Overbeek (EDLVO) theory calculations, the role of naphthalene sulfonate formaldehyde (NSF) in MCWS performance was explored. The measurement of the slurry ability of microfine coals demonstrated that the apparent viscosity and yield stress of MCWS were decreased significantly with 1.5% NSF addition, which was consistent with the saturated adsorption value of NSF on microfine coals. Furthermore, the ζ-potential and contact angle of microfine coals were both decreased as a function of the NSF dosage, indicating that a larger electrostatic repulsion force and better wetting ability of the coal surface would be obtained in the presence of NSF. The thickness calculation results showed that the thickness is increased with NSF addition, which is attributed to that the NSF molecule extends into the surrounding solution to form a hydrophilic film. The EDLVO calculations illustrated that the total interaction was turned from an attractive force into a repulsive force in the case of NSF, noting that the better dispersion of microfine coals mainly resulted from the better hydrophilicity of the coal surface modified with NSF. The findings might provide guidance for MCWS preparation by revealing the interaction mechanism of microfine coals modified with NSF.

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Effect of sodium silicate on the magnetic separation of ilmenite from titanaugite by magnetite selective coating

Cited by 40 publications

References 35 publications

Investigations on a novel collector for anionic reverse flotation separation of quartz from iron ores

Investigations on a novel collector for anionic reverse flotation separation of quartz from iron ores

Nanoceramics and novel functionalized silicate-based magnetic nanocomposites as substitutional disinfectants for water and wastewater purification

Insights into the Dispersion Mechanism of Microfine Coal Particles Modified with Naphthalene Sulfonate Formaldehyde Based on EDLVO Theory

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