Environmental protection is a very important subject in the course of human existence and development. The land area of the earth accounts for about 30% of the earth's surface area, while the ocean area accounts for only about 70% of the earth's surface area, and the fresh water on earth is only about 2.5% of the earth's total water. Faced with this situation, water conservation and wastewater treatment become remarkably urgent. At present, as a hot research topic of wastewater treatment, the strong magnetic separation process is very effective in wastewater treatment. So what is magnetic separation? How does it work? To what extent does it purify wastewater?
What is magnetic separation? Let LEYUAN tell you now. According to the different magnetic properties of different substances, there are three types of magnetic properties: ferromagnetism, paramagnetism, and diamagnetism. And ferromagnetic substances can be added to weakly magnetic wastewater as magnetic species for magnetic separation. When magnetic or non-magnetic substances in wastewater (magnetic species need to be added) are in the magnetic field, the substances are bound to be subjected to the force from the magnetic field. Of course, suspended particles in wastewater are subject not only to magnetic forces, but also subject to gravity, fluid viscosity, fluid inertia, and inter-molecular attraction. As long as the magnetic field applied is large enough, the suspended particles in wastewater can be magnetically separated.
Magnetic separation methods include permanent magnetic separation and electromagnetic separation (including superconducting magnetic separation). From the perspective of practical application, if we simply use permanent magnets to increase the strength of the magnetic field, we can indeed increase the magnitude of the magnetic force, but such magnets are too costly to produce. Therefore, the magnetic gradient separation method is mostly used, which is also called high gradient magnetic separation, that is, as long as the gradient of magnetic field strength is increased, the magnitude of magnetic force can be enhanced. Undoubtedly, magnetic separation technology is not only highly efficient and environmentally friendly in wastewater treatment, but also boasts low production and maintenance costs. As an enhanced version of the general magnetic separation technology, superconducting magnetic separation technology will greatly improve the performance of constant magnetic separation.
We have reasons to believe that magnetic separation technology will be widely applied in our daily life as scientists continue to study the separation degree mechanism of magnets and pollutants.
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