The
Calcinations
Process
Limestone is converted into calcium oxide and
carbon dioxide by means of calcinations at
temperatures in excess of 900°C. To ensure a
high level of purity, the calcinations process is
carried out using natural gas.
The temperature,
flow of Natural Gas and Fresh Air has to be
controlled properly to ensure the high quality
Calcium Oxide. Unless the calcinations process
is done properly, the quality of the product can
not be maintained. The first and the Foremost
important process of manufacturing Calcium
Carbonate is Calcinations.
Milk of Lime /
Calcium Hydroxide:
The Calcium Oxide
(Calcined Lime) derived through the Calcinations
process is than slacked with water to obtain
Calcium Hydroxide (Milk of Lime). The resultant
slurry contains some impurities and to remove
the impurities it is passed through wire mess
which removes some un burnt or over burnt lime
hence a better quality is ensured.
Carbonation:
The purified milk
of lime is then carbonated with Carbon Dioxide
which is derived during the first process of
Calcinations. This process ensures the Calcium
Carbonate and water. Proper temperature and
concentration has to be maintained during this
process to ensure desired product. The resultant
mixture of calcium carbonate and water is again
passed through the wire mess to remove any
impurity if still left.
Drying:
The drying is a
physical process and no chemical changes to the
material are made at this stage. The final stage
of the process is water solid separation; water
is to be removed from calcium carbonate. this
process is completed in two stages viz. making
cake by use of centrifuge which contains around
30% moisture. The cake then is dried through
spindal dryer where the material travels with
hot air at a temperature of more than 300o C.
The material is
then packed in HDPE bags at the outlet. The
material is packed in inner laminated HDPE bags
to ensure no further quality problems to the
material.
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