New technology of new process for iron ore magnetic separation---magnetic basis (1)

Magnetic The magnetic component is the difference in the respective solid material separated from each other a physical beneficiation methods, widely used in black, non-ferrous metals and rare ore sorting of heavy medium reproducing ferromagnetic weighting agent, and from industrial minerals and Removal of iron impurities and other aspects in other materials. With the development of science and technology, magnetic separation technology has been increasingly used in environmental protection and other areas of the national economy.
For mining purposes, magnetite, titanium magnetite, maghemite, hematite, limonite, siderite, manganese ore and chromium ore, it is the main target magnetic separation.
The magnetic separation of materials is mainly achieved in a stable magnetic field. Like the magnetic properties of the separated particles, the particle density, particle size and shape of the material and the structural characteristics of the magnetic separator have an effect on the sorting index.
(1) There are many types of unit systems in the electromagnetic unit of electromagnetics, but MKSA has a rational system and a Gaussian unit system. At present, in order to develop economic and cultural exchanges and avoid repeated calculations of various units of paralysis, it is recommended to use a unified International System of Units (SI). Due to the Gaussian system, the absolute electrostatic unit system (CGSE unit system or e.s.u) and the absolute electromagnetic unit system (CGSM unit system or e.m.u) still have certain advantages in some fields, some books and literature Gaussian unit system is still used, so this article will still be written in square brackets when it comes to CGSM system formulas and equations.
  (2) The basic concept of magnetic quantity A Magnetic field strength The magnetic field studied in magnetostatics is a time-independent magnetic field. The static magnetic field is caused by the orbital motion and spin motion of electrons in matter. At a given point, the measure of the ability of the current to generate a magnetic field is called the strength of the magnetic field. The magnetic field strength at any point H → (Ammi unit) and the current density J → (amperes / m ²⁾ relating to:

That is, the line integral of the tangential component of the magnetic field strength (for the closed curve) is equal to the area fraction of the normal component of the surface surrounded by the current passing curve. Equation (2) is called Ampere's law.
For a long straight conductor carrying current I, the strength of the magnetic field at r around it is derived from equation (2) as:

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A single layer solenoid is shown in Figure 1. It can be thought of as a set of current loops. If N and I are the number of turns and current, respectively, then the magnetic field strength along the axial direction is:

Its value is about half of the center. In addition to the two ends, the magnetic field strength inside the solenoid is approximately equal to the center field strength

For a given multi-layer solenoid (Figure 2), the center of the maximum magnetic

Where a———a ₁ /a _o ;
β=L/2a;
p———conductor resistivity ( Ω · m);
λ—The fill factor of the conductor in the coil.

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