System and process for dry magnetic concentration of fine iron ore concentrates

A dry magnetic concentration system of iron ore fine concentrates, comprising:

• a drying unit comprising a dryer selected from a group consisting of fast type dryer with a mechanical stirring system, flash dryer, rotary, or fluidized bed;
• a cooling unit comprising static or dynamic air classifiers, rotary coolers, column flash coolers, or fluidized bed;
• and
• a magnetic separation unit comprising from two to eight magnetic rollers, wherein said magnetic rollers comprise at least three splitters, wherein a first magnetic roller is made up of permanent low-intensity iron-boron magnets and remaining magnetic rollers are made up of rare earth magnets of high intensity;
• wherein the iron ore fine concentrates are from prior mineral concentration steps and have a Fe content ranging between about 58% and about 64%.