Magnetic Separation: Industrial and Lab Scale Applications

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(Saikia 2003, Iannicelli 2000, Gerber 1983 p132, China Clay Producers Association) Naturally colored due to the iron containing micas, tourmaline, pyrite, anatase and rutile, kaolin needs to be magnetically cleaned before used in paper or porcelain (Oder 1973, Oder 1976 IEEE, Gerber 1983 p132, Lofthouse 1981). Since the first magnetic removal of impurities by J. M. Huber Corp. in 1969, kaolin is processed for coating quality throughout the world with continuous high gradient magnetic separator (Figure 2). Competing with the leaching process, where chemical resistance of impurities limits usage, HGMS handles 75% of world production (Oder 1976). A typical plant would have an HGMS with a filter diameter of about 2 m and capacity up to 20 tons/h (Hirschbein 1982). Figure 3 shows kaolin mineral before and after the decolorization process.
Figure 2. Metso® High Gradient Magnetic Separators (HGMS) are designed to recover weakly magnetic material from non-magnetic matter and can be used for many applications including the processing of clays, iron ores, rare earths and industrial minerals. In addition to the strongly magnetic minerals of Fe, Co, and Ni, a vast number of weakly magnetic minerals, which are not normally treatable by ordinary magnetic separators, may be processed by High Gradient Magnetic Separators. Metso HGMS separators are able to remove even weakly paramagnetic materials. (From Metso Minerals)
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Page 24 and 25: Figure 13. Examples of batch magnet
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Magnetic Separation: Industrial and Lab Scale Applications

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