Z.  Hari, M.W.H.  Alias, A.  Anuar, N.A.  Hamid, 
    A Study of Mill Scale Derived Hematite Process for NiZn Ferrite as
EMI Suppressor in Terms of Magnetic Properties,
    Journal of Engineering and Applied Sciences,
    Volume 12,Issue 17,
    2017,
    Pages 4426-4430,
    ISSN 1816-949x,
    jeasci.2017.4426.4430,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2017.4426.4430)
    Abstract: Mill scale iron waste from the steel industry can be extracted into useful hematite and produced into
a NiZn ferrite as an EMI suppressor. The function of an EMI suppressor is to ‘choke’ the electromagnetic
interference produced by almost all electronic equipment, electrical wiring, wireless networks, etc. The most
widely used material is NiZn ferrite as it can work at high frequency. Some good characteristics of NiZn ferrite
toroid core is low permeability and high loss, namely resistivity, Relative Loss Factor (RLF) impedance and
coercivity. To help the environmental waste problems and reducing cost, hence the idea to convert mill scale
from the steel industry waste into hematite (Fe<sub>2</sub> O<sub>3</sub> ) which is the most important element in producing NiZn 
ferrite. Successful conversion of the mill scale into hematite was proven by X-Ray Diffraction (XRD) analysis
by designing and fabricating a magnetic separator. The NiZn ferrites were prepared by solid state reaction
technique. The 3 samples of different methods of hematite extraction were prepared. The ferrites were tested
by XRD, Scanning Electron Microscopy (SEM), permeability, RLF and coercivity. The process of hematite
conversion by running the HM sample through the magnetic separator followed by permanent magnet shows
the best result. It was proven by the sample HM that has the best characteristics for an EMI suppressor such
as low permeability (63.6), high RLF (1.23) and high coercivity (5.873 Oe).
    Keywords: Mill scale;hematite;NiZn ferrite;EMI suppressor;magnetic properties;permeability;RLF;coercivity