The science of magnetic separation has experienced extraordinary technological advancements over the past decade. As a consequence, new applications and design concepts in magnetic separation have evolved. This has resulted in a wide variety of highly effective and efficient magnetic separator designs.
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Finally, the materials of construction used in the fabrication of magnetic separators have advanced to a point that significantly extends service life while decreasing maintenance. Advanced materials, such as fiber composites, kevlar, ultra high molecular weight polyester, and specialty steel alloys are now commonly used in contact areas of the separator. These materials are lightweight, abrasion resistant, and comparatively inexpensive resulting in significant design advantages as compared to previous construction materials.
The evolution of high strength permanent rare-earth magnets has led to the development of high-intensity separators that operate virtually energy free. The use of rare-earth magnetic separators for beneficiation of industrial minerals has become the industry standard with literally hundreds of separators placed in recent years. The following sections present an overview of the most widely used permanent magnetic separators rare-earth drum and rare-earth roll-type separators.
There are three distinct types of magnetic separators using rare earth magnets, in addition to simple magnetic traps in the form of rods and grids.
1. Roll separators, see Figure 2, usually with an enveloping belt, supported by an idler roll.
2. Drum separators for dry and wet processing, see Figures 3-6, essentially similar to well-known low-intensity drum separators using ferrite magnets.
3. Matrix-type separators, such as the narrow-width vertical wheel.
Of the roll separators, there are at least fourteen manufacturers. Most of the different makes are based on the original Permroll design concept originated by this author. Various enhancements have been mainly focused on the belt tracking methods. New magnetic roll configurations and optimization of roll designs are relatively recent innovations. Additional optimization efforts are in progress.
At last count, seven manufacturers have commercially available drum separators, most based on magnet circuits derived from the use of conventional ferrite magnet. Two unique designs have been developed with one clearly offering advantages over older configurations.
Rare-earth elements have some unique properties that are used in many common applications, such as TV screens and lighters. In the 19708217s, rare-earths began to be used in a new generation of magnetic materials, that have very unique characteristics. Not only were these stronger in the sense of attraction force between a magnet and mild steel high induction, B, the coercivity Hc is extremely high. This property makes the magnetization of the magnet body composed of a rare-earth element alloy very stable, i.e., it cannot easily be demagnetized.
Materials and semi- nished products are called magnetic separation. Kanetec o ers a wide variety of magnetic separators for use with lump materials, bulk materials, clay-like materials and liquids. A magnetic separator to select must be suitable for the purpose of use and have a sufficient capacity.
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