1. Abstract:
Iron ore in feed flow of dry tailing process in hematite recovery plant, are often with
low magnetic induction. So a high intensity magnetic separator (HIMS) is being used
in order to extract them. In the present time, due to the lack of optimal operating
conditions of separator, average iron grade in tailing was high (46.57 %), with 15 ton
per hour and separator recovery for iron ore seems to be low (48.8 %). A review about
effective parameters in separator performance was done; such as field intensity, matrix
type and its gap, flow velocity of slurry and optimize particle size of feed flow. For
finding the optimum magnetic induction in lab, some tests were done with expanded
metal matrix. The best recovery was 62% and minimum tailing grade was 52%. But
maximum magnetic induction was 9000 gauss, which was unsuccessful to simulate
jones magnetic induction in plant. So grooved plates matrices with 2.5 and 3.8 mm gap
were made. These matrices could increase the magnetic field induction about to 4000
gauss. In a laboratory investigation with these new matrices, was found that with 12000
gauss magnetic induction and using grooved plate matrix with 3.8 mm gap and feed
d80 of 103 micron, we can achieve 31.3% separation efficiency. Also it was cleared that
the iron grade in tailing flow was not involved with pyrite ore and was achieved its
degree of freedom. In another experiment, it was cleared that if we separate minerals
under 38 micron from feed rate and separate each fraction apart, the total separation
efficiency will reach to 35.34%. With keeping this in mind that more than 50% of feed
rate of Jones separator in plant was under 38 micron, it was concluded that the main
problem of Jones separator in hematite plant is about fine particles.
Key words: Hematite recovery plant, Jones high intensity magnetic separators
(JHIMS), matrix, gap, field optimized intensity, magnetic force, optimum size fraction,
Fine particles, iron grade in tailing.

2. Shahid Bahonar University of Kerman
Faculty of Engineering
Department of Mining
Investigating the High Intensity Magnetic Separator (HIMS)
Performance in DTP Production Line at Gol-e-Gohar Hematite
Recovery Plant
Supervisor:
Abbas Sam
Advisor:
Mohammad Qaredaqi
Prepared by:
Mohammad Hossein Mohammadi
A Thesis Submitted as a Partial Fulfillment of the Requirements for the Degree
of Master of Science Mineral Processing (M. Sc.)
June 2013