Utilization of Iron Ore Slimes: A Future Prospective

In India, iron ores processing industries play a vital role in the
Indian economy. During the washing and processing of iron ores,
slimes less than 0.15 mm are generated and discarded into the tailing
pond. These slimes need processing as they cannot be used directly in
blast furnaces. In the present investigation, a typical iron ore slime
sample containing 59.22% Fe, 4.76% SiO2, and 4.57% Al2O3 was
taken. The desliming operation was carried out by using 2’’ Mozley
hydrocyclone. The process variables used to attain the optimum condition of desliming include the spigot opening, the feed pressure, and
the diameter of the vortex finder maintaining the pulp density at 10%
solid. The deslimed sample was treated by different techniques including an enhanced gravity separator to achieve iron concentrate with
65% Fe so that it can be used for steel making through pelletization.
The yield of the magnetic concentrate is about 46.8% with 65% Fe.
To improve the yield, the overflow from 2’’ hydrocyclone and the
rejects from magnetic separation were deslimed and processed to
recover the iron values. The final concentrate is 74% yield with
64.8% Fe, 1.76% SiO2, and 1.8% Al2O3