In the raw material i.e.
solid fuels like coal, lignite, agro fuels, etc. contains foreign particles (it
may be ferrous material or non-ferrous material). The fuel handling systems internal to boiler house includes specialized designed
Live Bottom Silo with reclaimers for non-free flowing fuels. It is necessary to remove foreign particles
for following reasons:
·
If any of iron particle goes into the crusher it shall damage the
crusher
·
It may block the nozzles in FBC type boilers
Removal of iron and
collection of iron powder from various kinds of raw materials and semi-fi finished
products are called magnetic separation.
A magnetic separator to
select must be suitable for the purpose of use and have a sufficient capacity. Selection
of the magnetic separator depends on following parameters:
·
Application (improving the grade, collecting useful magnetic
substances, etc.)
·
Kind, composition and components of raw materials
·
Grain size of raw materials
·
Water content, raw material temperature
·
Apparent specific gravity (bulk density)
·
Kind, shape and grain size of mixed magnetic substances
·
Amount of raw materials to treat per hour (kg/h, m3/h)
·
Amount and ratio of mixed magnetic substances
·
Other special conditions
Few examples of magnetic
separators are as follows:
·
Conveyor head pulley with magnetic pulley,
·
Suspension magnet
·
Hump Magnet
·
Suspended magnetic separator
