Effective Utilization of Blast Furnace Flue
Dust of Integrated Steel Plants
were carried out on the effective utilization of blast furnace flue dust samples obtained
from the two integrated steel plants at Rourkela and Jamshedpur. The samples essentially
contained unburnt coke and iron rich grains as the value added products. Flotation
technique was employed to recover the carbon values present in the sample. It was possible
to obtain a product containing around 80% carbon with more than 90% recovery from both the
flue dust samples using diesel oil and MIBC as the collector and frother respectively. The
results obtained by the column flotation technique were quite encouraging due to its
obvious advantages over conventional cells. Iron rich grains (magnetite, hematite, wustite
& Fe metals) were recovered by low intensity magnetic separation (LIMS) technique.
Magnetic separation of flotation tailings gave an iron concentrate of 61-64% Fe with
50-56% over all recovery. Studies were carried out also to remove the alkali content of
the flue dust sample by scrubbing and washing, so that the material as a whole could be
recycled for sinter making. However, total recovery of potassium was not possible because
of its complex nature of association with other elements.