After the mineral particles are magnetized in the external magnetic field, they can be regarded as an equivalent magnetic bar, as shown in the following figure:
   The magnetic moment of the magnetic bar is:       M=Q magnetic L
Q magnetic in the formula - the magnetic pole strength of the magnetic bar, An · m;
L - the length of the magnetic bar, meters.
However, the magnetic moment M does not indicate the extent to which the ore particles are magnetized. For example, there are two objects with different magnetic and different volumes. The magnetic moment of the magnet after magnetization is large, and the smaller the B, it seems that the magnetism of the armor is much worse than that of the B. If the molecular (or atomic) magnetic moments in the B object are all oriented in the direction of the external magnetic field, then the B magnetization is severe. Therefore, in order to describe the magnetization state (magnetization direction and strength) of mineral particles, it is necessary to introduce the concept of magnetization to reflect the degree to which an object is magnetized. The magnetization is numerically the magnetic moment per unit volume of mineral particles. Expressed by J , ie
Where J is the magnetization of the mineral particles, ampere/meter;
M—— magnetic moment of mineral particles, An · m 2 ;
V - the volume of mineral particles, m 3 .
The magnetization is a vector, and its direction varies depending on the nature of the ore; for a diamagnetic ore, the direction of magnetization is opposite to that of the external magnetic field; for paramagnetic ore particles, it is the same as the direction of the external magnetic field. The greater the magnetization, the greater the extent to which the ore particles are magnetized by the external magnetic field.
Think of magnetized mineral particles as an equivalent magnetic bar. Its magnetization can be expressed as:
Where S is the equivalent area of ​​mineral particles, m 2 ;
L - the equivalent length of the mineral particles, meters;
Q 0 - magnetic pole strength per unit area (magnetic pole surface density), ampere/meter.
That is, the magnetization of the mineral particles is equal to the magnetic pole strength or the magnetic pole surface density per unit area of ​​the magnetic rod.
Once the mineral particles are magnetized, they can also be viewed as an equivalent solenoid composed of many surface circular currents. The magnetic moment M of the solenoid is:
M = NIS
Where N is the number of turns of the solenoid;
I—— the current intensity of the solenoid, safety;
S—— The cross-sectional area of ​​the solenoid, m 2 .
Therefore, the magnetization of mineral particles can also be expressed as:
Where N is the number of surface round currents;
I—— the current intensity of each surface round current, amp;
S—— the cross-sectional area of ​​the equivalent solenoid, m 2 ;
L - the length of the equivalent solenoid, meters;
I 0 - Surface round current intensity per unit length, ampere/meter.
That is, the magnetization of the mineral particles is equal to the surface circle current intensity per unit length of the solenoid equivalent thereto.
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