DBPapers
DOI: 10.5593/SGEM2014/B13/S4.111

HIGH GRADIENT MAGNETIC SEPARATION OF CALCINED MAGNESITE

S.Hredzak, L.Pjura, M. Lovas, I. Znamenackova, M. Matik, A. Zubrik,K. Stefusova
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 875-882 pp

ABSTRACT
The contribution deals with the dry low-intensity high-gradient magnetic separation of caustic magnesia prepared from raw magnesite coming from the Mútnik deposit (Eastern Slovakia). Namely, the grain size classes of 0–0.5 mm and 0.5–1.0 mm have been upgraded using universal laboratory magnetic separator JONES at the magnetic field induction of 0.1T, 0.2T and 0.3T. Thus, selected samples of magnetic and nonmagnetic products were subjected to XRD study. As to a grain size of 0.5–1.0 mm the magnetic products at the mass yields of 69-79 % containing 84.79–86.56 % MgO, 5.79–5.95 % Fe2O3, 3.10–3.60 % SiO2, 1.94–2.74 % CaO and 0.56–0.57 % Al2O3 were won from the feed with 74.53–75.80 % MgO, 5.13– 5.41 Fe2O3, 6.25–6.74% SiO2, 6.57–7.35% CaO and 0.94–0.97 Al2O3. The recoveries of observed components into magnetic products were as follows: MgO 80.14–89.14 %, Fe2O3 77.93–86.85 %, SiO2 31.76–44.32 %, CaO 18.22–30.47 % and Al2O3 40.75– 46.80 %. Subsequently, at the separation of 0–0.5 mm class the magnetic products at the mass yields of 85.39–89.64 % with 81.29–83.23 % MgO, 5.09–5.24 % Fe2O3, 4.10–4.39 % SiO2, 2.57–2.92 % CaO, and 0.83–0.93 % Al2O3 were prepared from the feed with 77.17–79.09 % MgO, 4.90–5.07 % Fe2O3, 5.35–5.84 % SiO2, 4.42–4.76 % CaO and 1.03–1.06 % Al2O3. The recoveries into magnetic product attained the following values: MgO 91.32–93.66 %, Fe2O3 89.52–92.61 %, SiO2 59.93–73.56 %, CaO 46.15–58.79 % and Al2O3 67.09–80.59 %. The results of XRD study can be summarized as follows. Periclase as a dominant mineral accompanied by talc, magnesioferrite and magnesiowüstite was identified in magnetic product. On the other hand talc and periclase as dominant minerals accompanied by sericite and quartz were determined in non-magnetic product. An occurrence of chlorite and magnesite in this product is questionable.

Keywords: calcined magnesite, HGMS, XRD

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