Development of a Combined Gravity–Magnetic SepaitationProcess for Magnesite ORE Using HGMS

Abstract

Most magnesite deposits in Yugoslavia contain serpentine and olivine as impurities. Heavy medium separation is used for the beneficiation of raw magnesite ore with particle size greater than 0.35 ram. The results of investigations reported in this work indicate a possibility of efficient removal of serpentine and olivine using HGMS and superconducting magnetic separators for fines smaller than 0.35 ram. Based on these results a new technological process for magnesite upgrading was established. The process combines the gravity and magnetic separation processes for treatment of raw material, as well as for magnesite after its decarbonisation. It is possible to upgrade the magnesite fines below 0.35 mm which are rejected from the conventional processes. The grade of the magnesite concentrate of 98% and above may be obtained using this process.

Rapid Extraction of High- and Low-Density Microplastics from Soil Using High-Gradient Magnetic Separation

“…Since HGMS works as a function of magnetic forces and magnetic susceptibility and radius of the MP, a scaled-up system would simply require the quantity of modified iron nanoparticles and the capacity/throughput of the HGMS set-up to be adjusted appropriately. Larger HGMS systems have indeed been used in the mining industry (Chun, 1995;Dahe, 2000;Ignjatović et al, 1995) and laboratory HGMS systems of various sizes are available.…”

“…A technique known as high-gradient magnetic separation (HGMS) has the potential to improve recovery of MPs from soil, and bypass the methodological issues associated with the previous magnetic extraction method (Grbic et al, 2019). HGMS is widely used to separate micro-and nano-scale particles in aqueous suspensions (Alves et al, 2019;Gerber and Birss, 1983;Hillier and Hodson, 1997;Mullins, 1977;Rikers et al, 1998;Watson, 1973;Yavuz et al, 2009), and is widely applied to various matrix separation processes including those in the medical (Bhakdi et al, 2010) and mining industries (Chun, 1995;Dahe, 2000;Ignjatović et al, 1995), and for water purification (Yavuz et al, 2006). Soils contain a vast array of minerals that, even if not ordinarily considered magnetic, are rendered magnetic in the HGMS system, and HGMS is often used to separate these 'paramagnetic' minerals from soils (Mullins, 1977).…”