The Dust Experiments Mechanism Of High Gradient Magnetic Separation

The technology and mechanism of dust removal with high gradient magnetic separator are studied in this paper.The single condition experiments and the orthogonal experiments were conducted and explained 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 2%, air flow is 12m31h, dust entering time is 80s. The result also shows that the rate of steel wire filling is the greatest influence on the removal rate ,the second is air flow ,the third is magnetic field intensity, the last is dust entering time.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 dolomite and limestone dust from Guangzhou Iron and Steel work for example, the dust removal rate is only 59.3% without magnetic seed, but a rate of 61.2% can be get when the ration of magnetic seed to dust reaches 2%, a rate of 77.8% when the ration reaches 10%.Most of the dust diameter are exceed 38.5~im, the graded experiments show that the smaller the dust is ,the lower the removal rate is , the result indicated that the dust removal rate for magnetic seed is to above 95.3% when the diameters are between 50.0-74.Ojim, 99.l%for 74.Op.tm to 154.0 jim. When the diameter exceeds I 54.Ojim, almost all the dust can be removed.The mechanism of dust removal with HGMS was studied through hydrodynamics and magnetism in this paper. First, a equation of motion locus was set up through analyzing the force exerted on the dust, then the inside factions which have influenced the removal rate are disclosed through analyzing the interaction between the magnetic medium and dust, and the interaction among dust.