Simulation and Analysis of Magnetic Beads Sorting in High Gradient Magnetic Field and Efficiency Study

Based on the principles of high gradient magnetic field separation, build the model of the separation column, which uses steel balls as magnetic flux gathering matrix. Simulate the distribution of magnetic field and fluid field in the model. Define the magnetic force factor G to measure the magnetic force on magnetic beads, analyze the influences of external magnetic field, the diameter and the relative permeability of steel balls on G, respectively. And calculate magnetic beads movements in the effect of both magnetic field and fluid field, analyze the variation of adsorption rate with external magnetic field, the relative permeability of steel balls, the magnetic beads diameter, the steel balls diameter and the initial fluid velocity. Results indicate that: the magnetic force factor increases with stronger magnetic field, smaller steel balls diameter, and with the relative permeability of steel balls increases, it increases rapidly first, then decreases slightly and becomes steady. Magnetic beads adsorption rate increases with stronger magnetic field, larger magnetic beads diameter, smaller steel balls diameter and lower initial fluid velocity. Among all the factors, the magnetic beads diameter has the greatest influence on the adsorption rate, followed by the initial fluid velocity, the external magnetic field and the steel balls diameter.