Centrifugal high gradient magnetic separation of fine ilmenite

Zeng, Jianwu; Chen, Luzheng; Yang, Ruoyu; Xiong, Tao; Ren, Peng; Zheng, Yongming

doi:10.1016/j.minpro.2017.09.005

Cited by 43 publications

(12 citation statements)

References 19 publications

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“…Researchers have made efforts to improve the selectivity of HGMS by strengthening competing forces by increasing the fluid velocity or introducing centrifugal forces. ,, However, these forces, introduced or strengthened, are mechanical forces and show separation performance very similar to that of pulsating HGMS (a balance between grade and recovery is still necessary). This was mainly because these methods were effective in reducing the mechanical entrainment of nonmagnetic minerals but had limited effect on eliminating the competing capture of weakly magnetic gangue minerals.…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…The path of the solid particle in the tubular bowl centrifuge is examined using magnetic resonance imaging (MRI) and computational fluid dynamics (CFD) studies [18][19][20][21]. Zeng et al [22] proposed an innovative method that improved the seperation selectively due to the combined action of magnetic force, centrifugal force, and hydrodynamic drag upon paramagnetic particles.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Separation Efficiency in a Tubular Bowl Centrifuge

et al. 2022

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Centrifugal sedimentation, a well-known solid-liquid separation process, is typically used for the separation of solids from low concentration feeds because of its high separation efficiency due to high settling velocities. The performance of the tubular bowl centrifuge (TBC) can be studied by using the sigma theory, which assumes plug flow and rigid body motion inside the rotating bowl wall. The separation efficiency of the system is evaluated by determining the effective fluid layer thickness from the experimental data. A method suitable for evaluating the separation efficiency at different parameters for a given TBC is explained along with experimental validation. By using this method, different case studies are performed which depict the influence of each parameter on the separation efficiency. Also, it is demonstrated that the same higher separation efficiency (98 %) at 20 000 rpm could be achieved at higher bowl capacities.

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“…The radial force reduces, the inter-particle dispersibility lowers, particle mechanical entrainment increases, and pre-concentration efficiency declines as a result [22,23]. To summarize, the key to improving the efficiency of pre-concentration of weakly magnetic minerals is to increase the centrifugal force while maintaining the pulp flow regime as well as the radial force, and to improve particle dispersion while maximizing the specific magnetization coefficient and particle density difference [24,25].…”

Section: Introductionmentioning

confidence: 99%

Separation Analysis of New Magnetic Separator for Pre-Concentration of Ilmenite Particles

Han

Cheng

2022

Minerals

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To achieve the utilization of fine ilmenite (especially −0.075 mm) produced in the titanium-magnetite processing plant in Panzhihua, a radial turbulent outer-cylinder magnetic separator (RTOCMS), was developed in this study. After optimizing the conditions of rotation speed and water flow, an RTOCMS concentrate with TiO2 grade of 22.84% and TiO2 recovery of 66.93% was obtained through one-stage roughing pre-concentration flowsheet. Magnetic force and competing forces were calculated and analyzed to illustrate the pre-concentration mechanism, and the results revealed that the combination of high water flow and high rotation speed resulted in the most effective for pre-concentration of the fine ilmenite in the RTOCMS process. In addition, particle size analysis of the concentrate product indicated that the RTOCMS was effective for the recovery of medium particle sizes (−0.075+0.038 mm), with a continued enhancement for the recovery of fine-grained products (−0.038 mm). Hence, the RTOCMS provides an effective way to pre-concentrate fine ilmenite ore.

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Centrifugal high gradient magnetic separation of fine ilmenite

Cited by 43 publications

References 19 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

Evaluation of Separation Efficiency in a Tubular Bowl Centrifuge

Separation Analysis of New Magnetic Separator for Pre-Concentration of Ilmenite Particles

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