The design of magnetic field distribution in electromagnetic dry powder
magnetic separators is a key factor affecting sorting efficiency and equipment
performance. Reasonable magnetic field distribution can improve the recovery
rate of magnetic materials and reduce the misselection of non-magnetic
materials. The following are the main points of magnetic field distribution
design:
1、 Determine magnetic field strength based on material characteristics
The design of magnetic field distribution should first be matched based on
the magnetic strength of the sorted material. For weakly magnetic materials such
as hematite and limonite, high gradient and high-intensity magnetic fields need
to be designed; For strong magnetic materials such as magnetite, a relatively
low strength magnetic field can be used.
2、 Optimize the layout of magnetic pole structure
The reasonable arrangement of magnetic pole structure determines the
uniformity and gradient variation of the magnetic field in the working area.
Generally, a multipole combination arrangement is used to form an alternating
distribution of magnetic field strength, in order to achieve effective sorting
of materials with different particle sizes and magnetism. Ladder, sawtooth, or
dense arrangement can be used to increase magnetic flux density and magnetic
field gradient.
3、 Control the area of magnetic field action
By adjusting the length and installation angle of the magnetic pole to
control the range of the magnetic field in the magnetic separation zone, it can
completely cover the material flow trajectory without causing magnetic leakage
or ineffective magnetization, thereby improving the magnetic separation
efficiency and reducing energy consumption.
4、 Avoid magnetic short circuits and magnetic field interference
In magnetic field design, magnetic conductive and insulating materials should
be reasonably set to prevent magnetic short circuits and mutual interference,
ensure the consistency and stability of magnetic field direction, and improve
the efficiency of magnetic field utilization.
5、 Adjust the magnetic field gradient
Reasonable design of magnetic field gradient helps to achieve effective
sorting of fine-grained weak magnetic materials. High gradient magnetic fields
can generate drastic magnetic changes over short distances, improving the
ability to capture fine particles.
6、 Ensure magnetic field stability
The magnetic field distribution should not only be reasonable, but also
ensure stability during long-term operation. By optimizing the design of
electromagnetic coils, cooling systems, and power supply control strategies, the
magnetic field strength and distribution are kept constant to avoid magnetic
fluctuations caused by temperature rise.
7、 Combining simulation and optimization design
In the process of magnetic field distribution design, magnetic field
simulation software can be used for simulation analysis to predict the
distribution of magnetic field lines under different structural layouts,
identify blind spots, strong areas, or uneven areas in advance, and optimize the
design scheme accordingly to improve design accuracy and efficiency.
Through the above measures, the scientific design of the magnetic field
distribution of the electromagnetic dry powder magnetic separator can be
achieved, thereby improving the magnetic separation performance, saving energy
and reducing consumption, and extending the service life of the equipment.