Research Of High Gradient Magnetic Separation Technology

With the development and application of hydraulic technology, the reliability of hydraulic system and the service life of hydraulic components seem more and more important. The hydraulic fluid of hydraulic system can be contaminated for reasons, thus some faults may occur.70% of hydraulic system faults are caused by solid particles. In the solid particles, ferromagnetic particles occupy 30%?70% in different conditions. For this reason it is extremely necessary to remove ferromagnetic particles from hydraulic fluid. Currently the research of high gradient magnetic separation technology mostly focuses on wastewater treatment in domestic and it mostly focuses on separating ferromagnetic particles from viscous fluid abroad, but there is no concrete research for purifying ferromagnetic particles in hydraulic fluid.This paper introduces high gradient magnetic separation methods for removing ferromagnetic particles from hydraulic fluid. Firstly, for the purpose of forming a maximum volume and a certain magnetic field with a small amount of magnet, NdFeB permanent magnets which called "magnetic king" are arranged in reasonable Halbach array, thereby a magnetic field space of a cylindrical shape is formed, a magnetic separation vessel is produced by placing aluminous cylinder in the magnetic field. Secondly, a high gradient magnetic field space can be generated in the magnetic separation vessel by adding magnetic medium (SUS 430 stainless steel). Then a simple and practical high gradient magnetic separator performance evaluation test system is designed. Finally using the high gradient magnetic separator which developed by own and it's separation performance evaluation test system to study the affections magnetic medium filling rate, diameter and hydraulic fluid flow rate for separation efficiency, then some disciplines are obtained and get the corresponding conclusions. In this structure, when the flow rate of hydraulic fluid is 5L/min, the filling rate of magnetic medium is 8%, the wire diameter of magnetic medium is between 20?40?m, the separation efficiency for ferromagnetic particles which size between 5?15?m can reach more than 85% and it has a certain value.