1). The crude ore first proceed the preliminary broken through jaw crusher, generally divide into coarse crushing and fine crushing two stages; 2) the appropriate stone size(10-20 mm) will be get from the last process, then will be evenly feed into the ball mill through the elevator and mining feeder, the ball mill break and grind the ore into the fine ore; then feed into the spiral classifier, 3) due to the gravity differences of the solid particles, their deposition rate will be different too, using this theory, the spiral classifier will wash and classify the fine ore particles, 4) the washed and classified fine ore particles will be sent to the magnetic separator, making use of minerals susceptibility differences, magnetic separator will separate the magnetic minerals from the fine ore particles mixers by the magnetic force and mechanical force, and get 65% iron ore concentrate.
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