10.57647/j.ijes.2024.1604.22

Modification of mineral processing circuit in Arjin mine through a mineralogical study: magnetic separation and reverse flotation

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  • Behzad Nemati Akhgar*1,
  • Sepideh Kheiri1,
  • Morovvat Faridazad2,
  • Sajad Chehreghani1,
  • Ata Bahrami1,
  1. Mining Engineering Department, Engineering Faculty, Urmia University, Urmia, Iran
  2. Faculty of Mining Engineering, Sahand University of Technology, Tabriz, Iran
Modification of mineral processing circuit in Arjin mine through a mineralogical study: magnetic separation

Received: 2023-11-09

Revised: 2023-12-28

Accepted: 2024-02-01

Published 2024-11-04

Copyright (c) 2024 Behzad Nemati Akhgar, Sepideh Kheiri, Morovvat Faridazad, Sajad Chehreghani, Ata Bahrami (Author)

Creative Commons License

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

How to Cite

Nemati Akhgar, B., Kheiri, S., Faridazad, M., Chehreghani, S., & Bahrami, A. (2024). Modification of mineral processing circuit in Arjin mine through a mineralogical study: magnetic separation and reverse flotation. Iranian Journal of Earth Sciences, 16(4), 1-9. https://doi.org/10.57647/j.ijes.2024.1604.22
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Abstract

The current mineral processing circuit of the Arjin iron mine faces serious problems regarding its
reduced efficiency. In the present research, the concentrator circuit of the Arjin mine was modified
through mineralogical study and other laboratory approaches magnetic separation, and flotation
tests. The results verified that the feed contained magnetite as a valuable mineral with a degree of
liberation of about 91 μm. The magnetic separation and flotation tests were conducted to modify
the circuit by measuring the iron recovery, sulfur, and iron contents in the obtained concentrates
and tails. The magnetic separation tests with a magnetic field strength of 1000 Gauss were carried
out on the initial feed with different d80 to determine the influence of particle size. The results
verified that the feed with d80 = 120 μm could be considered the best feed size for magnetic
separation. The sulfur content was then reduced from 0.99% to 0.05% in the final concentrate
of reverse flotation as a desulfurization step. Based on the results, the proper circuit included
reverse flotation and magnetic separation consisting of rougher, cleaner, and re-cleaner with the
field intensities of 2500 G in the rougher and 800 G in the cleaner and re-cleaner steps. Finally, the
total iron content was improved from 58% to 68.1%, and the recovery percentage was raised from
65% to 83.39% by the applied modifications.

Keywords

  • Geometallurgy,
  • Mineralogy,
  • Iron ore,
  • Magnetic separation,
  • Reverse flotation,
  • Desulfurization
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