The invention relates to a
magnetite beneficiation process capable of fully releasing mill capacity. The
magnetite beneficiation process includes the steps that raw ore is subjected to three-section breaking and secondary dry separation and then ultrafine-ground through high-pressure roller milling, after high-pressure roller milling products are screened through screening equipment, undersize products are fed into a wet type preselection
magnetic separator, wet type preselection rough concentrate is subjected to ore
grinding, classifying, magnetic separating and reselecting, partially-qualified concentrate is obtained, reselecting process
tailings are fed into second-section ore
grinding after being subjected to concentration
magnetic separation, second-section ore
grinding products are subjected to
magnetic separation, fine screening classification and elutriating selecting, and qualified concentrate is obtained. As the high-pressure roll milling products are subjected to wet type preselection, a large quantity of qualified
tailings can be thrown out, the mill entering quantity is reduced, and the ore milling cost and the
energy consumption are reduced; the partially-qualified concentrate can be recycled in advance through the magnetic and gravity combined
separation process by means of the
density difference between iron minerals and lean coenobium; and in the whole process,the mill capacity can be fully released, energy saving and consumption reduction are achieved, compared with current conventional processes, the
effective volume of a
ball mill can be reduced to be 50% or below, the investment can be greatly reduced, and the production cost is reduced.