Concentration of Ores Video Lecture - Chemistry Class 12 - NEET

concentration of poles in this module
you will learn about the different
methods used for the concentration of
always which means removal of unwanted
materials associated with yours minerals
from which metals can be extracted
conveniently and economically are calls
or also found in the earth crust and
contain one or more metal compounds
along with certain nonmetallic and
earthy impurities the extraction of a
metal from its ore involves several
physical and chemical processes such as
the concentration of poor isolation of
metal from the concentrated or and
purification of the metal all these
processes are collectively referred to
as metallurgy in this module you will
learn in detail about the first step of
metallurgy the concentration of all sent
rating and all means getting rid of all
the unwanted materials from the ore
which are also referred to as the gangue
depending on the properties of the oil
and its ganc
the methods used for concentrating in
all may include hydraulic washing
magnetic separation froth flotation and
leaching its first learn in detail about
the method of hydraulic washing which is
based on the difference in the gravities
of the ore and the gang particles in
hydraulic washing powdered or is spread
on a sloping block having crews when a
stream of water is allowed to flow over
the or lighter gang particles get washed
away leaving the heavier particles
behind within the groove
in magnetic separation powdered odors
passed over a conveyer belt running over
to rollers one out of which is magnetic
for magnetic particles get attracted to
the magnetic roller and travel a
distance we can wear belt little longer
than the non magnetic particles
therefore the non magnetic particles
drop down first forming a key whereas
the magnetic particles drop down a
little later forming a separate e next
method used for concentration of pour is
the froth flotation method which is
based on the difference in the wetting
properties of the OL and the gang
particles the froth flotation method is
used exclusively for sulphide ohs where
the all particles are wetted by oil
while the GAM particles are wetted by
the water in the froth flotation method
the powdered or is mixed with water and
small amount of fine oil the resulting
mixture is then agitated by blowing
compressed air through it the oil in the
mixture forms fraught with the air the
froth rises up to the surface containing
the all particles the gangue particles
on the other hand settle down in water
froth is then collected in another
container where it is washed and dried
to obtain the concentrated or in the
leaching method the powdered bauxite all
is treated with mud and concentrated
solution of sodium hydroxide the all
dissolves in sodium hydroxide to form
sodium aluminate and silica dissolves to
form sodium silicate the other
impurities however remain undissolved
and are later filtered out the filtrate
containing the sodium aluminate and
sodium silicate is further treated with
carbon dioxide gas this leads to the
precipitation of the hydrated aluminium
oxide leaving behind sodium silicate in
the solution the hydrated aluminum oxide
is then filtered out and heated strongly
to form pure aluminum oxide in this
module you have learned that naturally
occurring chemical substances containing
metals are called minerals and those
minerals from which metals can be
extracted conveniently and economically
are called ores the extraction of a
metal from its all involves several
physical and chemical processes namely
concentration of or isolation of metal
from the concentrated or and the
purification of the metal concentration
of all means getting rid of all the
unwanted materials which are also
revered as gang from the ore commonly
used methods for the concentration of
ores include hydraulic washing magnetic
separation froth flotation and leaching
hydraulic washing is based upon the
difference in the gravities of the ore
and gang particles magnetic separation
is based on the difference in the
magnetic properties of ore and gang
particles front floatation process is
based on the difference in the wetting
properties of the ore and gang particles
leaching process is used when the all
particles are soluble in such a solvent
in which the gang particles cannot
dissolve