· Because the crystal water in limonitic ores will report to the iron ore concentrate in magnetic separation, the iron ore concentrate grade is limited to about 52% Fe. Figure shows an example of a flow sheet to upgrade a limonitic ore. The ore is mainly composed of limonite and quartz with a grade of about 40% Fe. The ore is first ground to about 80% 75 μm and then processed using .
and magnetic concentrate together with their mineral characteristics, samples were analyzed. Sub sieve Size analyses were also performed and it was found that 90% of the concentrate produced was typically coarser than 10 microns in size whereas 85% of the separator .