OICC Press Iranian Journal of Earth Sciences 2228-785X 16 4 2024 11 04 Modification of mineral processing circuit in Arjin mine through a mineralogical study: magnetic separation and reverse flotation 1 9 10.57647/j.ijes.2024.1604.22 EN Behzad Nemati Akhgar Mining Engineering Department, Engineering Faculty, Urmia University, Urmia, Iran https://orcid.org/0000-0003-3161-5932 Sepideh Kheiri Mining Engineering Department, Engineering Faculty, Urmia University, Urmia, Iran https://orcid.org/0009-0000-2801-7021 Morovvat Faridazad Faculty of Mining Engineering, Sahand University of Technology, Tabriz, Iran https://orcid.org/0000-0001-7744-9162 Sajad Chehreghani Mining Engineering Department, Engineering Faculty, Urmia University, Urmia, Iran https://orcid.org/0000-0003-4230-5454 Ata Bahrami Mining Engineering Department, Engineering Faculty, Urmia University, Urmia, Iran https://orcid.org/0000-0001-6315-4486 Journal Article 2024 11 04 The current mineral processing circuit of the Arjin iron mine faces serious problems regarding itsreduced efficiency. In the present research, the concentrator circuit of the Arjin mine was modifiedthrough mineralogical study and other laboratory approaches magnetic separation, and flotationtests. The results verified that the feed contained magnetite as a valuable mineral with a degree ofliberation of about 91 μm. The magnetic separation and flotation tests were conducted to modifythe circuit by measuring the iron recovery, sulfur, and iron contents in the obtained concentratesand tails. The magnetic separation tests with a magnetic field strength of 1000 Gauss were carriedout on the initial feed with different d80 to determine the influence of particle size. The resultsverified that the feed with d80 = 120 μm could be considered the best feed size for magneticseparation. The sulfur content was then reduced from 0.99% to 0.05% in the final concentrateof reverse flotation as a desulfurization step. Based on the results, the proper circuit includedreverse flotation and magnetic separation consisting of rougher, cleaner, and re-cleaner with thefield intensities of 2500 G in the rougher and 800 G in the cleaner and re-cleaner steps. Finally, thetotal iron content was improved from 58% to 68.1%, and the recovery percentage was raised from65% to 83.39% by the applied modifications.