Dry-type negative-pressure ore dressing system for magnetite

The utility model provides a magnetite dry type negative pressure mineral separation system which comprises a stock bin, a feeding machine is arranged on one side of the stock bin, a first crusher and a second crusher are sequentially arranged at an outlet of the feeding machine, a ball mill is arranged on one side of the second crusher, a spiral classifier is arranged at an outlet of the ball mill, and the first crusher and the second crusher are arranged on the other side of the stock bin. The spiral classifier is communicated with a closed dry magnetic separator through a closed chute, and the closed dry magnetic separator is communicated with a bag-type dust collector through a negative pressure pipe. Aiming at the problem that magnetite in a water-deficient mine cannot be utilized, the utility model develops a magnetite dry type negative pressure beneficiation system which meets the environmental protection requirement, the negative pressure system is adopted to pump out tailings raised in the shell of t