Mineral Processing

1. APPLICATIONS
OF MAGNETIC SEPARATOR
ON CALCINING
LIMESTONE PRODUCTION
EM 422: MINERAL PROCESSING
Engr. Romeo M. Santos
-------------------------------------
INSTRUCTOR

2. Calcination
A thermal treatment process in the absence or limited
supply of air or oxygen applied to ores and other solid
materials to bring about a thermal decomposition
Calcination is carried out in furnaces or reactors
(sometimes referred to as kilns or calciners) of various
designs including shaft furnaces, rotary kilns, multiple
hearth furnaces, and fluidized bed reactors.

3. Calcination

4. Calcination
Calcination reactions usually take place at or
above the thermal decomposition temperature. This
temperature is usually defined as the temperature at
which the standard Gibbs free energy is equal to zero.
Calcination at higher temperature means higher
agglomeration and more shrinkage. Also the density of
limestone is related to the crystal structure. The shape
of crystals determines the void space between crystals,
and hence the density of the limestone.

5. Metal Refining
Considerable quantities of limestone are used
in blast furnaces to remove some of the impurities
as a molten slag.
A typical usage rate is 200 kg/t pig iron.
Limestone can be used to form slags in
steelmaking (e.g., in the obsolescent Open Hearth
process and to a limited extent in modern
processes), but the heat absorbed in decomposing
it to lime generally limits its use. It is widely used as
a fluxing agent in the smelting of metals, and in the
extraction of bauxite in the production of aluminium.

6. Magnetic Separator
Utilized primarily on removing the contaminants
before and after the calcination process of
limestone. Such contaminants are tramp iron,
ferrous scraps, metallic debris, iron fillings, etc.
One purpose is to protect the crushing and
grinding machines from abrasion caused by
contaminants.

7. Over-belt Magnetic Separator
Even before the
calcination takes place,
magnetic separators are
used in the conveyance
of limestone from the
quarry into the loading
utilities.

8. Over-belt Magnetic Separator
The over-belt magnetic separator type is
intended for removal of tramp iron from bulk
materials transported on conveyor belts or
vibratory feeders.
The magnetic separator is used to protect of
process machines against damage caused by
an unwanted piece of ferrous metal and also to
recover valuable ferrous scrap from waste
materials.

9. Magnetic Head Pulley
provides a dependable, self cleaning
means of tramp metal extraction on conveyor
belt applications
the permanent magnetic forces protect
your capital equipment by providing continuous
and effective removal of unwanted tramp metal
increases uptime, reduces maintenance
costs and provide a metal free product

10. Magnetic Cross Belt Separator
a suspended magnet with a continuously
running belt that strips off captured tramp metal
and discharges off the side or end of the
conveyor
the permanent magnetic forces provide
continuous and effective removal of unwanted
tramp metal, permanent magnet will retain
tramp metal even during power outages and
fluctuations

11. Magnetic Belt Separator
Provides a dependable, means of tramp
metal extraction in chute applications. The
permanent magnetic forces protect capital
equipment by providing continuous and
effective removal of unwanted tramp metal.
Will increase uptime, reduce maintenance
costs and provide a metal free product.
Permanent Magnetic Plate separators are
easily retrofitted into existing chute and
hoppers.

12. Magnetic Conveyors
Powerful permanent magnets are
conveyed below a nonmagnetic stainless steel
slider bed to move and convey ferrous metal
objects. The liquid-tight, sealed conveyor
housing can be completely submerged in
machine reservoir tanks and the internal
self-adjusting take-up system eliminates the
need for maintenance.

13. Thanks for
watching!
Have a rock
boulder.