Goudsmit Magnetics recently constructed a new electromagnetic overbelt magnet for Langezaal BV of Haaksbergen. This is intended for optimization of the ferrous metal separation on an existing rubble crusher. Overbelt magnets of this type find their use in applications such as waste processing, construction and demolition sorting lines and separation of undesired ferrous particles from the underlying flow of material. When designing the improved frame for the electromagnetic overbelt magnets the company's aim was to minimize dissipation and thus degradation of the magnetic field. This results in maximum deferrization. Another important aspect factored into the new design was the impact of iron on the magnetic belt. During waste processing there is often a considerable amount of very thick metal strand (reinforcing steel) that can cause wear. The belt of the magnet was therefore given extra reinforcement. Optimal operation of the magnet depends on various factors, such as belt width, installation height, density, substitutability, adjustability and weight savings, aspects that are also important when it comes to service and maintenance.
Permanent and electromagnetic overbelt magnets
Permanent and electromagnetic overbelt magnets are mounted hanging over a conveyor belt and separate iron particles from the underlying flow of material. Goudsmit produces exclusively bipole and tripole overbelt magnets. These generate a high gradient, which means that the magnet configuration exerts even more pulling force on an iron particle. In most cases a permanent magnet is a technically and economically favourable choice. This type of magnet saves electricity and therefore has a lower environmental impact. An electromagnetic overbelt magnet is often heavier in construction and more powerful when it comes to coarse fractions. Another advantage of an electromagnetic overbelt magnet is that it can be switched off. This makes cleaning the magnet a simple task.