Magnetic field arrangement structure of high-gradient magnetic separator for magnetic coagulation water treatment

Abstract

The invention discloses a magnetic field arrangement structure of a high-gradient magnetic separator for magnetic coagulation water treatment. The magnetic separator comprises a plurality of permanentmagnet main magnetic poles, permanent magnet auxiliary magnetic poles and an arc-shaped iron plate; the permanent magnet main magnetic poles are arranged on the outer circumferential surface of the arc-shaped iron plate and are evenly distributed in the circumferential direction; the permanent magnet auxiliary magnetic poles are arranged between every two adjacent permanent magnet main magnetic poles, the two ends of each auxiliary magnetic pole are shorter than the main magnetic poles, and the polarity of one side of the contact surface of the auxiliary magnetic poles and the main magnetic poles is the same as the polarity of the outer sides of the main magnetic poles. The magnetic field intensity of the open type magnetic separator is enhanced, and the problems of magnetic flux leakageand magnetic losses existing in magnetic field arrangement of a traditional magnetic separator are avoided. The high-gradient magnetic separator manufactured through the method can be used for treatment of various kinds of industrial sewage and domestic sewage, black-odor river treatment, lake, river and surface water purification, a tap water precipitation process, seawater desalination pretreatment process and the like.

Description

technical field [0001] The invention relates to the technical field of magnetic coagulation water treatment, in particular to a magnetic field arrangement structure of a high-gradient magnetic separator used for magnetic coagulation water treatment. Background technique [0002] Magnetic coagulation is to add magnetic powder in the conventional coagulation process, and effectively combine the magnetic powder with the coagulation floc. Due to the high density of the magnetic powder, the density of the coagulation floc is greatly increased and the sedimentation speed of the floc is accelerated. , the surface hydraulic load can reach 20-40m 3 / (m 2 h), much higher than the 1-2m of conventional coagulation 3 / (m 2 h), at the same time, the effluent water quality is good, comparable to that of ordinary quartz sand filtration. The effluent solid suspended solids SS<5mg / L, turbidity<1.0NTU, total phosphorus TP<0.02mg / L, has excellent phosphorus removal effect . The te...

AI Technical Summary

Problems solved by technology

[0004] However, the current magnetic separators used in magnetic coagulation systems often cannot meet the requirements, the magnetic induction and gradient strength are not enough, the depth of the magnetic field is shallow, and the force on the magnetic powder is not strong enough, resulting in magnetic powder (its particle size is generally Within 20 microns) under the action of the shear force of the rapid flow of sludge, it cannot be recovered by magnetic force well, and the loss rate of magnetic powder is high, which seriously affects the normal operation of the magnetic coagulation system

In addition, the unreasonable design of the magnetic separator often results in waste of permanent magnet materials, resulting in high cost of the magnetic separator

In the final analysis, the above defects are caused by the unreasonable arrangement of the magnetic field in the magnetic separator, and the arrangement of the magnetic field cannot well meet the requirements of magnetic powder recovery under the condition of magnetic coagulation

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