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Effect of microwave irradiation on selective heating
behavior and magnetic separation characteristics of
Panzhihua ilmenite#
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Zhao Wei, Chen Guo, Chen Jin, Peng Jinhui**
(Faculty of Metallurgical and Energy Engineering, Kunming University of Science and
Technology, Kunming 650093, PR China)
Abstract: The influences of microwave irradiation on the surface characteristics of Panzhihua ilmenite
were systematically investigated. The crystal structures, surface morphology and surface chemical
functional groups of ilmenite were characterized before and after microwave irradiation and magnetic
separation for different microwave treatment times by using various methods, such as XRD, SEM, and
FT-IR, respectively. XRD analysis showed that the microwave treated ilmenite has the strongest peaks
of phase more than that of raw samples, indicates that the crystalline compound of ilmenite increased
with the microwave irradiation time. SEM analysis showed the micro-cracking appeared at many grain
boundaries of ilmenite after being pretreated by microwave treatment. The separations of ilmenite from
gangue minerals were completed and the micro-fissure within ilmenite minerals were also formed,
which could be attributed to the microwave selective heating characteristics of the different minerals
and compounds, and the thermal stresses were caused by the uniform heat rate disturbed under
microwave irradiation. The mineral processing results showed that the magnetic separation
characteristics and properties of microwave treated ilmenite samples were better than that of
microwave untreated ilmenite samples. It was concluded that microwave irradiation can be applied
effectively and efficiently to the irradiation processes of Panzhihua ilmenite.
Key words: Microwave irradiation; ilmenite; crystalline compound; structure
0 Introduction
Microwave irradiation technology is being used for a variety of reasons in fascinating and
attractive advanced inter-disciplinary
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