The wet high intensity magnetic separation of magnesite ore waste

Ahmet Atasoy


The wet high intensity magnetic separation of magnesite ore waste stocked in an open pit of a magnesite mine was investigated in this paper. The received sample was subjected to physical, chemical, thermal and phase characterizations. The magnesite ore waste sample contained 77.69 % MgCO3 and a considerable amount of Fe2O3 (3.14 %). The unwanted silica and iron impurities were removed and a high-grade magnesite was experimentally obtained. Results have shown that a high-grade magnesite was obtained after subjecting the non-magnetic portion of the processed sample twice at 1.8 T. It was possible to increase the magnesite content up to 91.03 % while reducing the iron content to 0.32 % by using magnetic separation. After the calcination process at 1000 oC, the sample showed mass loss on ignition of 52 % and contained 85.39 % MgO with 0.32 % Fe2O3. The final product can be used in chemical and metallurgical applications where high magnesia contents are required. The experimental results provide useful information on wet magnetic separation of magnesite wastes.


Magnesite waste; beneficiation; magnetic separation; calcination; magnesia

Full Text:

PDF (475 kB)


Yuna Z, Guocai Z. A technology preparing honeycomb-like structure MgO from low grade magnesite. Int. J. Miner. Process. 2014;126: 35-40.

Yılmaz A, Kusçu M. Formation, classification, applications and quality classification of magnesite deposits. ERU. J. Inst. Sci. Technol. 2012; 28: 65-72. (in Turkish)

Bilge A, Yaman C, Sarıoğlu N. Turkey's magnesite for production of fused magnesia, properties and uses in refractory applications. In: Processing Technology, 60th Inter Colloquium on Refractories EUROGRESS, Aachen, Germany. 2017, 1-10.

Gence N. Enrichment of magnesite ore. Eng. Arch. Fac. Osmangazi University.2001; 14:2:1-10 (in Turkish).

Song S, Lu S, Lopez-Valdivieso L. Magnetic separation of hematite and limonite fines as hydrophobic flocks from iron ores. Miner. Eng.2002;15: 415-422.

Kelland DR. High gradient magnetic separation applied to mineral beneficiation. IEEE T. Magn. 1973; 9: 3, 307-310.

Uslu T, Atalay Ü, Arol AI. Effect of microwave heating on magnetic separation of pyrite. Colloids and Surfaces A. 2003; 225: 1:161-167.

Oberteuffer J. High gradient magnetic separation. IEEE Transactions on Magnetics. 1973;9: 3: 303-306.

Svoboda J, Fujita T. Recent developments in magnetic methods of material separation. Miner. Eng. 2003;16: 785-792.

Gupta CK, Krishnamurthy N. Extractive Metallurgy of Rare Earths, London: CRC Press; 2005.

Yavuz CT, Prakash A, MayoJT, Colvin V. Magnetic separations: From steel plants to bio technology. Chem.Eng. Sci. 2009;64: 2510- 2521.

Yao J, Yin W, Gong E. Depressing effect of fine hydrophilic particles on magnesite reverse flotation. Int. J. Miner. Process. 2016;149: 84-93.

Roza N, Zafar NI, Najam-ul HM. Utilization of formic acid solution in leaching reaction kinetics of natural magnesite ore. Hydrometallurgy. 2014;149: 183-188.

Jordens A, Cheng YP, Waters KE. A review of the beneficiation of rare earth element bearing minerals. Miner. Eng. 2013;41: 97-114.

Ferron CJ, Bulatovic SM, Salter RS. Beneficiation of rare earth oxide minerals. In: Inter. Conf. On Rare Earth Minerals and Minerals for Electronic Uses. Prince Songkla University, Hat Yai, Thailand, 1991;251- 269.

Falconer A. Gravity separation: old technique/new methods. Phys. Separ. Sci. Eng.2003; 12: 1:31-48.

Dobbins M, Dunn P, Sherrell I. Recent advances in magnetic separator designs and applications. In: 7th Inter. Heavy Minerals Conf. SAIMM. Johannesburg, S. Africa, 2009, 63-70.

Bentli I, Erdoğan N, Elmas N, Kaya M. Magnesite concentration technology and caustic calcined product from Turkish magnesite middling by calcination and magnetic separation. Sep Sci Technol. 2017; 52: 6; 1129-1142.


Copyright (c) 2019 HEMIJSKA INDUSTRIJA

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.