A process for producing high purity Fe2 o3 for value-added applications including blast furnace feed a poor-grade iron ore slime

摘要

The invention relates to a process for producing high purity Fe2O3 for value- added applications including blast furnace feed from a poor-grade iron ore slime, comprising the steps of separating through a non-selective dispersion of iron-containing ultra fines having different particle sizes ranging between 100 micron to 100 nm, into coarser and finer categories in a plurality of hydrocyclones of different sizes, wet-grinding the coarser category with a particle size of more than 15 microns under varied concentration to convert into finer category with a particle size of less than 15 microns; and allowing the produced fines in a single benefication step to undergo a selective flocculation by adapting a modified starch which generates a first concentrate containing around 68.5% Fe, 0.8% alumina, and 1% silica, and a first tailing containing around 29.8% Fe, 20.5% alumina, and 19.67% quartz; allowing the first concentrate to undergo a further dispersion followed by a further selective flocculation to produce high grade concentrate and a second tailing, the high grade concentrate being suitable for value-added applications; and allowing the first tailing to undergo a selective flocculation to produce a second concentrate and a second tailing, the second tailing being suitable as material for refractory and building construction, wherein the second concentrate suitable for peptization.