| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
HU Zhicheng, XIE Shunping, LU Dongfang. Dry High−intensity Magnetic Separator of Fine Hematite Enhanced by Aerodynamic Field[J]. Conservation and Utilization of Mineral Resources, 2023, 43(5): 71-80. doi: 10.13779/j.cnki.issn1001-0076.2023.05.008
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Dry High−intensity Magnetic Separator of Fine Hematite Enhanced by Aerodynamic Field
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Abstract
A novel pneumatic magnetic separator was developed to address the adhesion and aggregation of fine weakly magnetic materials and improve the captured selectivity in dry conditions. A mixture sample of hematite and quartz with a TFe content of 17.5% was used as the feed to investigate the separation performance of the novel magnetic separator for the mixture with different particle sizes. The experimental results showed that the novel magnetic separator significantly strengthened the dispersion between particles and greatly improved the selectivity of dry magnetic separation of fine particles. For the −0.038+0.015 mm hematite particles, the TFe grade increased by 20% compared with the conventional system under similar recovery. In addition, the aerodynamic field can eliminate the adhesion of −0.038+0.015 mm quartz particles to the surface of the −0.15+0.074 mm hematite particles, thus preventing fine quartz particles from entering the concentrate and reducing its grade. Finally, force analysis showed that the aerodynamic field can overcome the interparticle interaction and improve selective separation, but a high gradient magnetic field was required to enhance the recovery of magnetic particles.
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Keywords:
- dry separation /
- high−intensity magnetic separator /
- aerodynamic field /
- hematite /
- quartz
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References
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HU Zhicheng, XIE Shunping, LU Dongfang. Dry High−intensity Magnetic Separator of Fine Hematite Enhanced by Aerodynamic Field[J]. Conservation and Utilization of Mineral Resources, 2023, 43(5): 71-80. doi: 10.13779/j.cnki.issn1001-0076.2023.05.008
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Figure 1.
Aerodynamic dry high−intensity magnetic separator (a: structural diagram; b: sorting schematic diagram)
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Figure 2.
Distribution of magnetic field in aerodynamic dry high−intensity magnetic separation (a: magnetic field distribution, b: magnetic induction, c: axial magnetic field gradient, radial magnetic field gradient)
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Figure 3.
Distribution of airflow velocity in different surface airflow velocity (a: 0 m/s, b: 0.26 m/s, c: 0.48 m/s, 0.72 m/s)
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Figure 4.
Characterization of experimental samples (a: XRD of quartz, b: XRD of hematite, c: B−H curve of hematite, d: particle size analysis)
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Figure 5.
Experimental results of surface airflow velocity for mixture of hematite and quartz with the same particle size
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Figure 6.
Experimental results of rotor speed for mixture of hematite and quartz with the same particle size
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Figure 7.
Experimental results of feed airflow velocity for mixture of hematite and quartz with the same particle size
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Figure 8.
Comparison of separation indexes between conventional magnetic separator and aerodynamic magnetic separator for mixture of hematite and quartz with the same particle size
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Figure 9.
The forces acting on different particle size (a: hematite; b: quartz) and the SEM of concentrate of mixture of hematite and quartz with the same particle size (c, e, g: conventional magnetic separator; d, f, h: aerodynamic magnetic separator)
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Figure 10.
Experimental results of surface airflow for mixture of hematite and quartz with different particle size
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Figure 11.
Experimental results of rotor speed for mixture of hematite and quartz with different particle size
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Figure 12.
Experimental results of feed airflow velocity for mixture of hematite and quartz with different particle size
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Figure 13.
Comparison of separation indexes between conventional magnetic separator and aerodynamic magnetic separator for mixture of hematite and quartz with different particle size
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Figure 14.
The force acting on the mixture of −0.15+0.074 mm hematite and −0.038+0.015 mm quartz (a) and SEM of concentrate of the mixture (c: conventional magnetic separator, d: aerodynamic magnetic separator); The force acting on the mixture of−0.038+0.015 mm hematite and −0.15+0.074 mm quartz (b) and SEM of concentrate of the mixture (e: conventional magnetic separator, f: aerodynamic magnetic separator)