Roasting of a Low-Grade Goethite Ore Using Horse Residue and Its Beneficiation by Magnetic Separation


In the present study, the use of horse residue as an alternative reducing agent in the roasting of a low-grade goethite ore containing 17.60% Fe was investigated. Additional roasting experiments were carried out with corn starch and without reducing agent for comparison. Each roasted product was characterized using X-ray diffraction (XRD) and magnetic hysteresis (MH) loops analyses. The optimum roasting conditions (roasting temperature [400, 500, and 600 °C], reducing agent/ore ratio [0.04, 0.08, and 0.12], and roasting time [10, 20, and 30 min]) were investigated based on the Taguchi approach. The magnetic susceptibilities of the roasted sample with the addition of reducing agents were higher compared to that of the roasted sample in the absence of reducing agent. Experimental findings indicate that the horse residue can be used as the reducing agent. Finally, an iron ore concentrate assaying a Fe grade of 62.12% with a recovery of 56.93% was prepared using wet magnetic separation at a magnetic intensity of 0.5 T from the ore roasted under the following roasting conditions: roasting temperature of 500 °C, reducing agent/sample ratio of 0.08, and roasting time of 30 min.

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  1. 1.

    Ponomar VP (2018) Thermomagnetic properties of the goethite transformation during high-temperature treatment. Miner Eng 127:143–152

    Article  Google Scholar 

  2. 2.

    Jang K-o, Nunna VRM, Hapugoda S, Nguyen AV, Bruckard WJ (2014) Chemical and mineral transformation of a low grade goethite ore by dehydroxylation, reduction roasting and magnetic separation. Miner Eng 60:14–22

    Article  Google Scholar 

  3. 3.

    Ravisankar V, Venugopal R, Bhat H (2017) Investigation on beneficiation of goethite-rich iron ores using reduction roasting followed by magnetic separation. Miner Process Ext Metall 128:175–182

  4. 4.

    Li C, Sun H, Bai J, Li L (2010) Innovative methodology for comprehensive utilization of iron ore tailings: part 1. The recovery of iron from iron ore tailings using magnetic separation after magnetizing roasting. J Hazard Mater 174:71–77

    Article  Google Scholar 

  5. 5.

    Ponomar VP (2018) Synthesis and magnetic properties of magnetite prepared by chemical reduction from hematite of various particle sizes. J Alloys Compd 741:28–34

    Article  Google Scholar 

  6. 6.

    Ponomar VP, Dudchenko NO, Brik AB (2017) Reduction roasting of hematite to magnetite using carbohydrates. Int J Miner Process 164:21–25

    Article  Google Scholar 

  7. 7.

    Wu Y, Fang M, Lan L, Zhang P, Rao KV, Bao Z (2012) Rapid and direct magnetization of goethite ore roasted by biomass fuel. Sep Purif Technol 94:34–38

    Article  Google Scholar 

  8. 8.

    Vapur H, Top S, Altiner M, Uçkun Ş, Sarikaya M (2020) Comparison of iron ores upgraded with Falcon concentrator and magnetic separators assisted by coal reduction-conversion process. Part Sci Technol 38:409–418

  9. 9.

    Zhang X, Han Y, Sun Y, Li Y (2019) Innovative utilization of refractory iron ore via suspension magnetization roasting: a pilot-scale study. Powder Technol 352:16–24

    Article  Google Scholar 

  10. 10.

    Peng T, Gao X, Li Q, Xu L, Luo L, Xu L (2017) Phase transformation during roasting process and magnetic beneficiation of oolitic-iron ores. Vacuum 146:63–73

    Article  Google Scholar 

  11. 11.

    Yu J, Han Y, Li Y, Gao P (2017) Beneficiation of an iron ore fines by magnetization roasting and magnetic separation. Int J Miner Process 168:102–108

    Article  Google Scholar 

  12. 12.

    Rath SS, Rao DS, Mishra BK (2016) A novel approach for reduction roasting of iron ore slime using cow dung. Int J Miner Process 157:216–226

    Article  Google Scholar 

  13. 13.

    Wu F, Cao Z, Wang S, Zhong H (2017) Phase transformation of iron in limonite ore by microwave roasting with addition of alkali lignin and its effects on magnetic separation. J Alloys Compd 722:651–661

    Article  Google Scholar 

  14. 14.

    Sun Y, Zhu X, Han Y, Li Y (2019) Green magnetization roasting technology for refractory iron ore using siderite as a reductant. J Clean Prod 206:40–50

    Article  Google Scholar 

  15. 15.

    Rath SS, Rao DS (2017) Dolochar as a reductant in the reduction roasting of iron ore slimes. Int J Miner Metall Mater 24:1341–1351

    Article  Google Scholar 

  16. 16.

    Nayak D, Dash N, Ray N, Rath SS (2019) Utilization of waste coconut shells in the reduction roasting of overburden from iron ore mines. Powder Technol 353:450–458

    Article  Google Scholar 

  17. 17.

    Rashid RZA, Yunus NA, Salleh HM, Ani MH, Akiyama T, Purwanto H (2014) Enhancement of magnetic properties of Malaysian iron ore by reduction roasting using oil palm empty fruit bunch. ISIJ Int 54:994–996

    Article  Google Scholar 

  18. 18.

    Rath SS, Rao DS, Tripathy A, Biswal SK (2018) Biomass briquette as an alternative reductant for low grade iron ore resources. Biomass Bioenergy 108:447–454

    Article  Google Scholar 

  19. 19.

    Hunt CP, Moskowitz BM, Banerjee SK (1995) Magnetic properties of rocks and minerals. In: Ahrens TJ (ed) Rock Physics and Phase Relations: a handbook of physical constants, AGU Ref. Shelf, vol 3. AGU, Washington, D.C, pp 189–204

    Google Scholar 

  20. 20.

    Tadic M, Panjan M, Damnjanovic V, Milosevic I (2014) Magnetic properties of hematite ( α-Fe2O3) nanoparticles prepared byhydrothermal synthesis method. Appl Surf Sci 320:183–187

    Article  Google Scholar 

  21. 21.

    Higuchi K, Heerema RH (2003) Influence of sintering conditions on the reduction behaviour of pure hematite compacts. Miner Eng 16:463–477

    Article  Google Scholar 

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This study was supported by Cukurova University (Project No. FBA-2019-10123).

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Correspondence to Mahmut Altiner.

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Altiner, M. Roasting of a Low-Grade Goethite Ore Using Horse Residue and Its Beneficiation by Magnetic Separation. Mining, Metallurgy & Exploration 37, 1357–1365 (2020).

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  • Goethite ore
  • Roasting
  • Horse residue
  • Magnetic separation
  • Magnetic susceptibility