Experimental And Theory On Dust Removal With High Gradient Magnetic Separation

High Gradient Magnetic Separation (HGMS) is a new, efficient and speedy separation technology The technology characteristics and the influence of operative conditions on the dust removal efficiency of HGMS were systematically studied in this paper. The main aspects are as follows:The single condition experiments and the orthogonal experiments were conducted in order to get the main factors which effect on the rate of dust removal and to get the influence law. The result of the experiments shows that the best technological conditions are: the magnetic field intensity is 5.2KGs,the rate of steel wire filling is 5%, separation velocity is 0.5m/s, separation cycle is 300 .The result also shows that the rate of steel wire filling is greatest influence on the removal rate, the second is separation velocity, the third is magnetic field intensity, the last is separation cycle.It is shown by experiments that the rate of dust removal can exceed 90%, when the best technological condition were applied to strong magnetic dust, but for weak magnetic dust, the rate is lower than 60%. As to get a high dust removal rate of weak-magnetic dust, magnetic seeds are added into. The higher the ration of magnetic seed to dust, the higher the rate is. Take the limestone dust from Wuhan Iron and Steel work for example, the dust removal rate is only 59.1% without magnetic seed, but a rate of 61% can be get when the ration of magnetic seed to dust reaches 2%, a rate of 77.6% when the ration reaches 10%.According to some research results conducted by former researchers, the axial build-up model was established for the particle in HGMS process, and the removal rate of dust particle was conducted. And the operating parameters, which affect the removal rate, are studied.The mechanism of dust removal with HGMS is studied through hydrodynamics and magnetism in this paper. The inside factions, which have influenced the removal rate, are disclosed through analyzing the interaction between the medium and dust, and the interaction among dust.