Purifying Technology And Equipment Of Elecrtomagnetic Separation For Galvanizing Processing

One of most important questions in galvanizing industry is to how to decrease and get rid of the dross from zinc pot, to control its track in zinc pot, and to reduce the defect on steel strip surface during galvanizing processing.In order to set up the electromagnetic separation equipment, the feasibility of electromagnetic separation as to static and continuous moving molten Zn is investigated firstly. Then numerical simulation is applied to analyze flow and temperature field in different zinc pot model.Under the static state, the dross with size above 5μm can be gathered on ceramic pipe channel walls. Both the central channel and edge channel has the same separation efficiency. When molten Zn is moving, the dross size is larger, the removal efficiency is higher. The dross above 20μm can be completely removed. The removal efficiency of dross with size range 5 to 10μm can reach 76.2%, which shows electromagnetic separation of dross from molten Zn is a feasible way during galvanizing processing. The numerical simulation of three different zinc pot models shows that the distribution of inlet and outlet pipes in zinc pot makes a decisive role on the flow and temperature field. The immerging depth of pipes has little influence. The parameter of zinc pot's structure is as follows: 70 <ΔL < 120( mm) ,150 < H出<200( mm), H进=50( mm). The electromagnetic separation equipment has been designed and set up.