Basic conditions for separation of ore particles during magnetic separation
It can be seen from Fig. 1 that the trajectory of the magnetic ore particles recovered in the magnetic product is determined by the combined force of the magnetic force and the mechanical force acting on the magnetic ore particles. The ore particles entering the non-magnetic product are little affected by the magnetic force, and are not even affected by the magnetic force, and the trajectory of the movement is determined only by the mechanical force. When the magnetic force of the magnetic separator on the ore particle is greater than the mechanical force, the magnetic ore is attracted to the cylinder and rotates with the cylinder, and is brought to the unloading area as a concentrate, while the non-magnetic ore is used. The slurry flow is discharged as tailings.
Figure 1 Schematic diagram of the magnetic separation process
It can be seen that if the two minerals with stronger magnetic properties and weaker magnetic properties are to be well separated, the magnetic force of the magnetic particles with stronger magnetic properties must be greater than the combined force of the mechanical forces opposite to the magnetic direction, that is, the following conditions must be met. :
ƒ 1 magnetic > Σƒ machine > ƒ 2 magnetic
In the formula Æ’ 1 magnetic , Æ’ 2 magnetic - the magnetic force acting on the magnetic particles with strong magnetic properties and weak magnetic properties;
Σƒ machine - a direction opposite to the magnetic force of the mechanical force (including gravity, centrifugal force, friction, hydrodynamic, etc.).
This formula not only illustrates the separation conditions of different magnetic ore particles, but also illustrates the essence of magnetic separation, that is, magnetic separation is achieved by utilizing the different effects of magnetic force and mechanical force on different magnetic ore particles.
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