B High-gradient electrification is the result of research in recent years. It is a progress in dielectric sorting and a new equipment developed for the selection of fine-grained materials. Similar to high-gradient strong magnetic separation, the dielectric fiber is polarized in an electric field to increase the electric field gradient, and the dielectric fiber is completely similar to the dry high gradient. Magnetically selected steel wool media.
A non-conducting spherical object is placed in an insulating medium fluid and is subjected to a non-uniform electric field. When subjected to equilibrium, the dielectrophoretic force is:
The rest of the unit symbols are the same as before.
If the object is also an anisotropic like a magnetic object, then a is a tensor and cannot be calculated, but for a spherical object, the polarizability is:
In the formula, the symbols and units such as r, E, ε m and ε L are the same as before. [next]
Obviously, F e is directly related to electric field strength and gradient. The larger the electric field intensity E is, the larger the gradient ▽→ is, the larger the dielectrophoretic force is, and the F e is determined by the shape and size of the filament, and the electric field strength is the matrix. Depending on the gradient produced after polarization. Figure 3 is a schematic diagram of the construction of a periodic high gradient electric separator. The dielectric used in the sorting tank is glass fiber, ball or rod-shaped titanate (such as barium titanate, etc.), ceramic fiber, etc., and is added to the sorting tank, which is filled with an insulating dielectric liquid.
After the two plates are connected to the power source, the dielectric fibers are polarized, and positive and negative charges appear at both ends, forming a high-gradient unit electric field, thereby generating a large amount of electric power, trapping the ore particles, and collecting the ore particles. The polyelectric effect has established a new capture point. Studies have shown that the power F e can exceed 50 to 150 times the gravity, and the cut area captured in the electric field is more than 100 times the radius of the fiber medium, but only limited to the surface of the dielectric fiber or sphere, when equal to or larger than the dry fiber or At the diameter of the sphere, the non-uniformity of the dielectric approaches zero. As long as the power is interrupted, the ore particles trapped on the surface of the fiber or sphere can be washed away immediately, so the new method has great advantages.
Such equipment now developed into a continuous high gradient electric separator, and has been used in oil refining, metal and the vegetable oil industry, promising widely used in mineral processing, chemical industry, waste disposal, which processes up to micron particle size Grades, even colloidal particles can be separated by this device.
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