Matching relation between matrix aspect ratio and applied induction for maximum particle capture in longitudinal high gradient magnetic separation

Zheng, Xiayu; Sun, Zixi; Wang, Yuhua; Lu, Dongfang; Xue, Zixing

doi:10.1016/j.seppur.2020.116687

Cited by 18 publications

(5 citation statements)

References 41 publications

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“…In addition, both the TiO 2 grade and the mass of magnetic products obtained by matrices with an aspect ratio of 2 were the highest. This was consistent with the matching relation between the matrix aspect ratio and the applied induction for maximum particle capture in HGMS in our previously published papers. , …”

Section: Resultssupporting

confidence: 92%

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Significantly Improved Separation Efficiency of Refractory Weakly Magnetic Minerals by Pulsating High-Gradient Magnetic Separation Coupling with Magnetic Fluid

Zheng

Jing

Sun

et al. 2022

ACS Sustainable Chem. Eng.

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High-gradient magnetic separation (HGMS) is indispensably applied in the rougher separation stage of refractory weakly magnetic minerals. The most difficult problem while processing refractory weakly magnetic minerals is the low selectivity of HGMS caused by the competing capture of magnetic valuable and gangue minerals. In this study, a paramagnetic fluid is introduced into HGMS and an innovative method, termed highgradient magnetic separation coupling with magnetic fluid (HGMSCMF), with a significantly high selectivity is proposed. A new competing force (magnetic repulsive force) generated by the magnetic fluid will enlarge the force difference of valuable and gangue minerals and improve selectivity. The relative magnetic force acting on the magnetic valuable and gangue minerals can be adjusted by varying the fluid volume susceptibility, with the optimal fluid susceptibility approaching that of gangue minerals. HGMSCMF experiments on an ilmenite ore using paramagnetic MnCl 2 solutions showed that the selectivity was remarkably improved by increasing MnCl 2 concentrations (fluid susceptibility). The TiO 2 grade and mass of magnetic products could be simultaneously improved by increasing the applied induction in HGMSCMF, whereas in conventional HGMS, the TiO 2 grade and recovery decreased and increased, respectively. HGMSCMF is applicable to various matrices (or separators), and a significantly improved TiO 2 grade (close to that of industrial concentrates) could be obtained with only one-stage HGMSCMF. The recycling of magnetic fluid and cost economy of HGMSCMF are also discussed and analyzed. HGMSCMF presents several advantages over conventional HGMS and has great application prospects for realizing the clean and efficient utilization of refractory weakly magnetic minerals or materials.

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Section: Resultssupporting

confidence: 92%

“…This was consistent with the matching relation between the matrix aspect ratio and the applied induction for maximum particle capture in HGMS in our previously published papers. 55,56 4.4. Effect of Pulsating Frequency.…”

Section: Effect Of Matrix Aspect Ratiomentioning

confidence: 99%

Significantly Improved Separation Efficiency of Refractory Weakly Magnetic Minerals by Pulsating High-Gradient Magnetic Separation Coupling with Magnetic Fluid

Zheng

Jing

Sun

et al. 2022

ACS Sustainable Chem. Eng.

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“…For instance, Li et al used HGMS technology to purify quartz from iron tailings with a SiO 2 content of 81.39% and obtained a quartz concentrate with a purity of 98.56% [80] . The HGMS system, as depicted in Figure 13 [81][82][83][84] , delineates the separation and purification process while also illustrating the particle size separation thresholds pertinent to this system.…”

Section: Superconducting High-gradient Magnetic Separationmentioning

confidence: 99%

“…High temperatures can destroy the structure of associated silicate minerals (feldspar and mica). Subsequent water ; (B) FEM simulation of the magnetic field distribution near a circular cross-section substrate with the strongest magnetic field in the horizontal direction [82] ; (C) Longitudinal distribution of particle motion trajectories near a circular cross-section, with escape trajectories in red, critical trajectories in blue, and capture trajectories in green; (D) Particle accumulation maps on different cross-sectional substrates [83] ; (E) Particle size separation limits in the HGMS system, with circles (μ 0 H = 2 T) and boxes (μ 0 H = 7 T) as separation limit regions [84] . FEM: Finite element method; HGMS: High Gradient Magnetic Separation.…”

Section: Plain Calcined and High-temperature Sulfide Roastingmentioning

confidence: 99%

Recent advances in the marketing, impurity characterization and purification of quartz

Xie,

Li,

Pan

et al. 2023

Miner Miner Mater

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Due to its stable physical and chemical properties and its abundance in nature, quartz is widely employed in industrial and high-tech applications. However, the presence of diverse types and states of impurities in quartz ores from different geological formations poses a challenge in the process of purifying high-purity quartz, leading to wastage of raw materials and escalated costs. This study presents the socio-economic applications of quartz, scrutinizes the formation and separation mechanisms of impurities in quartz ores from a mineralogical perspective, examines the obstacles faced in quartz purification, explains the current state of development, and provides a technical summary of quartz purification. The analysis reveals that lattice impurity elements and various types of inclusion impurities are the principal factors affecting the purity of quartz. Various green separation techniques are applied based on the composition of the quartz minerals and the state of the impurities. Standard practices may involve physical pre-treatment such as scrubbing, ultrasonic crushing, and electromagnetic pulse cracking, followed by rough cleaning through color separation, superconducting high gradient magnetic separation, and flotation, and chemical pre-treatment (high-temperature or microwave roasting with chloride doping, and ammonium sulfate thermal crushing combined with water quenching to remove gas-liquid inclusions from quartz minerals). Finally, finishing processes such as fluorine-free and catalytic hot-pressure acid leaching or microbiological purification treatment with filamentous or Aspergillus fungi are used to obtain high-purity silica sand with an anticipated purity of about 99.99%.

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“…Numerical simulation has been widely used for process study in many fields (Sahbaz et al, 2012;Wang et al, 2020;Sarhan et al, 2017;Zheng et al, 2020). In this study, the computational fluid dynamics (CFD) code CFX 18.0 was employed for calculating the TKE.…”

Section: Cfd Simulationsmentioning

confidence: 99%

Improving separation efficiency of galena flotation using the Aerated Jet Flotation Cell

Li¹,

Wang²,

Lu³

et al. 2020

Physicochem. Probl. Miner. Process.

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The low separation efficiency of traditional mechanical flotation cells for galena flotation primarily was caused by the low collision probability between bubbles and fine particles and high detachment probability of coarse particles. A flotation device named Aerated Jet Flotation Cell (AJFC) was adopted to improve the separation efficiency of galena flotation. Reducing bubble size and optimizing turbulence distribution were respectively confirmed as effective ways to improve fine galena-bubble collision efficiency and decrease detachment probability of coarse galena. In AJFC, micro-bubbles in diameter of 0.1-0.3 mm were generated by forcing compressed air to pass through porous high-density polyethylene tube, and high shear rate and appropriate turbulence were provided by installing a sparger with holes at the end of downcomer. The key parameters, including sparger hole number, turbulent kinetic energy (TKE), air-slurry ratio and superficial gas velocity (Jg) were optimized to achieve a desired separation performance of galena flotation. Separation efficiency of 62.54 % at a residence time of 2.25 min was achieved by AJFC, while separation efficiency of 59.12 % at a residence time of 7.5 min was achieved by mechanical flotation cell. Besides, AJFC had less loss of Pb in tailings than mechanical flotation cell in the whole particle size range, especially for fine (-25 µm) and coarse (+74 µm) size fractions.

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Matching relation between matrix aspect ratio and applied induction for maximum particle capture in longitudinal high gradient magnetic separation

Cited by 18 publications

References 41 publications

Significantly Improved Separation Efficiency of Refractory Weakly Magnetic Minerals by Pulsating High-Gradient Magnetic Separation Coupling with Magnetic Fluid

Significantly Improved Separation Efficiency of Refractory Weakly Magnetic Minerals by Pulsating High-Gradient Magnetic Separation Coupling with Magnetic Fluid

Recent advances in the marketing, impurity characterization and purification of quartz

Improving separation efficiency of galena flotation using the Aerated Jet Flotation Cell

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