Block magnets remove undesired ferromagnetic (Fe) particles – such as iron or steel – or even weakly magnetic particles, such as processed stainless steel, from material flows with relatively little Fe contamination. The effectiveness of block magnets varies from 70 to 90% deferrization. If an even purer product is desired, one or more additional deferrization stages can be added.
Operation: block magnets can be placed above flat or trough-shaped conveyor belts. The Fe particles will be drawn out of the raw material flow and held by the block magnet. To see how it works, watch the working principle film. When there is a lot of iron, it is better to use an overbelt magnet; this type continuously carries away the iron parts. The method that can be used to clean the magnet depends on the version:
Permanent block magnets
- Consume no power, a factor that contributes to their price-effectiveness.
- The Fe particles must be removed manually or semi-manually (with sliding cleaning tray).
Electromagnetic block magnets
- Can be switched on and off, which makes cleaning easier. When the magnet is switched off the Fe particles simply fall off the block.
- Consume power and require a control box. They are therefore more expensive than permanent block magnets.
