DOI: 10.5176/2251-1857_M312.21
Authors: Yong Jae Suh, Dae Sup Kil, Hee Dong Jang
Abstract:
To reduce the cost of magnetite nanoparticles, we
develop a technology that prepares a high-purity iron
hydroxide, a starting material for the particle synthesis,
directly from a low-grade iron ore. Si and Mg that
inhibit the formation of magnetite nanoparticles are
selectively removed. The silica present in the iron ore
leachate is removed by coprecipitation or polymer
adsorption, thereby obtaining a supernatant. From the
supernatant, iron hydroxide is allowed to be
precipitated leaving Mg behind. This iron hydroxide is
used as a starting material in preparing magnetite
nanoparticles of 5 to 15 nm in size by coprecipitation.
The magnetization hysteresis curves for these
particles show nearly zero coercivity and the saturated
magnetization of 49.4 emu/g and 53.0 emu/g, slightly
lower than that of the nanoparticles synthesized with
pure reagents, 60.3 emu/g.
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