Magnetic Separation: Industrial and Lab Scale Applications
Magnetic Separation: Industrial and Lab Scale Applications
Magnetic Separation: Industrial and Lab Scale Applications
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<strong>Magnetic</strong> separation of pyrite (FeS2) from coal for desulfurization is also very much<br />
practiced by industrial means (Maxwell 1978). The weakly magnetic nature of pyrite,<br />
however, led to pretreatments for better removal. The most useful procedure was found to<br />
be the thermal conversion of pyrite (FeS2, Ms=0.3 emu/g) to pyrrohite (Fe7S8, Ms=22<br />
emu/g). Up to 91% removal of sulfur from coal was achieved by microwave heating<br />
followed by a magnetic separation (Uslu 2003). Figure 6 shows a picture of Eugene Hise<br />
testing magnetic separation on pulverized coal. Figure 7 has an industrial scale drum<br />
separator used in large scale applications.<br />
Figure 6. Eugene Hise pours crushed coal into a magnetic separator designed to remove<br />
contaminants from pulverized coal. (Courtesy of Oak Ridge National <strong>Lab</strong>oratory<br />
(ORNL). Ref: ORNL Review 1992 Vol 25 (3-4) Chapter 7)
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