Demagnetizing device technology applied in gravity concentration

The invention relates to a demagnetizer process applied in gravity separation operation. The demagnetizer process is characterized in that demagnetization operation is carried out before gravity separation operation; gravity separation operation feeding ore pulp is fed into demagnetization operation equipment, namely a demagnetizer through a gravity separation feeding pipe; when ore pulp flows through a demagnetizer loop, magnetic iron ore grains in the ore pulp are formed into magnetic hysteresis loops with similar shapes and the areas gradually reduced to zero in the end, by means of magnetic induction B and outer magnetic field density H under the action of an outer magnetic field; under the remagnetization of a gradually weakened alternating magnetic field, the magnetic iron ore grains lose remanence in the end, thereby realizing demagnetization and eliminating magnetic agglomeration and magnetic linkage; and gravity separation operation of demagnetized material is carried out immediately to reduce other