2012年（464）
分类： Delphi
2012-07-31 16:15:42
1. Ore problems when in operation
(1) Due to large amount of lean iron
ore (takes up 97.5% of total iron ore reservation) and associated ore (takes up
one third of total iron ore reservation), and high degree hardness of ore stone,
magnetic separator unavoidably suffer impact force from pelleted mineral and
wear seriously. It is not unusual case that magnetic drum surface wear out by
ore rocks. Once worn out, magnetic drum will be filled with ore slurry which
adheres to surface of magnetic system. As a result, drum shell and magnetic
system locked. In other case, ore slurry flows into bearing and causes damage to
bearing or even the whole set of equipment.
(2) Strontium ferrite magnets and
neodymium-Iron-Boron magnets are commonly used for magnetic system. However, the
chemical stability of neodymium-Iron-Boron magnet is relatively poor. When
magnetic drum is exposed in moisture environment, it is easy oxidation on
surface and layer gradually peeling off. Although good the chemical stability
is, strontium ferrite magnet generally bonded into magnetic group with epoxy
resin adhering to magnetic system. But it also is easy to peel off. Above all,
whether neodymium-Iron-Boron magnet or Strontium ferrite magnet, they all need
being necessarily fixed.
2. Solutions
(1) Protect magnetic drum from being
wore out. Add protective coating is a most effective way to prolong drum service
life. It is wear resistant and easy for replacement. This protective layer uses
wear-resistant rubber-coated, stainless steel plates, PU coating, PVC-coated
control layer for testing. The testing results proved that PVC coating control
layer can extend service life of drum to large extent.
(2) Fix magnetic
system. We did a package testing to the magnetic system with glass ribbon
brushed with epoxy resin, iron making packaging tape and iron stainless steel
plate. According to testing results, we select 1Ｃｒ18Ｎｉ9Ｔｉstainless steel at
0.5cm thickness to pack magnetic system. The joints at two ends of stainless
steel plate are nipped with thin clamp and fixed with bolt at both ends, which
adjust the tension degree. In this way, it not only has little effect on the
surface magnetic field but also is strong enough wrapped tight force to magnetic
system. And the effect is significant. After the introduction of this method, it
never occurred shedding of magnetic block, and thoroughly solved the the
magnetic system fixed problem.
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