Iron ore concentration process with grinding circuit, dry desliming and dry or mixed (dry and wet) concentration

An iron ore concentration process with grinding circuit, dry desliming and dry concentration, wherein the process comprises the steps of:

• a) crushing an iron ore;
• b) dry grinding of the iron ore crushed in step a);
• c) dry desliming of the iron ore grinded in step b);
• and
• d) magnetically separating the iron ore deslimed in step c), resulting in a concentrate iron product and a reject that is separated, wherein step c) is performed by pneumatic classifiers, with a cut of 90%<37 μm,
• wherein step d) is performed by magnetic drums using a combination of first and second intensity magnetic fields followed by a magnetic roll separator having a third intensity magnetic field and a gradient, wherein the third intensity magnetic field is higher than the second intensity magnetic field, and the second intensity magnetic field is higher than the first intensity magnetic field, and wherein the process is a fully dry concentration process.