What is Quick lime or Burnt Lime?
Burnt Lime also called as quick lime or calcium
oxide is formed out of lime stone deposits or mines which are wide spread
throughout India.
The calcium oxide is extensively used as a mortar
within the construction of building by mixing in with suitable proportion of
sand and surkhee of burnt clay as aggregate.
It is also used for white washing of homes and
building.
Foundries, Iron and steel plants use lime as a
fluxing agent in their process.
Some drugs and pharmaceuticals, paper industry,
pesticides formulations and other chemical processing industries are using the
unslaked lime or Quick lime.
As there are many applications of the quick lime,
we should ensure particular properties of the quick lime for using in the
recipe of AAC Blocks.
Properties required for Quick lime in AAC manufacturing:
Process of Manufacture
The limestone mined from quarry or rivers should be
free from all defects and impurities, once washed and cleaned again for removal
of dust particles.
These stone blocks are crushed manually or by jaw
crusher in sizes of three to six inches.
Oil fired vertical shaft kiln (VSK) refractory
lining inside portion having
about 33 metre conical vertical chimney, is
employed for the firing or calcination of lime stone at a temperature of about
900O C.
The chimney of VSK is so arranged that the speed of
exhaust
gases and fumes within the chimney may travel @ 9
to 12m/sec.
The diameter of chimney is so calculated that the
lower/
bottom portion of chimney is one third of the
entire stack of chimney.
Skip bucket with rope, which is driven by electric
motor, is arranged for loading of stone pieces for firing of calcination.
These stone pieces are loaded from the highest of
kiln, this process is completed regularly as per the need of stone calcination.
A cyclone or dust catcher is additionally arranged with a scrubber which
collect about 50 to 80% dust particles and removed with scrubber. Approx. 4 kg.
6 kg. sludge/hr. is removed by this process which can be discharged to land
fill.
The firing is done with the help of burner.
The firing is initiated from rock bottom section of
kiln and after an appropriate interval the calcium oxide unloaded through the
outlets provided at rock bottom section of kiln.
Property calcium oxide is sorted call at different
grades sort of a , B and C grade.
Semi calcium oxide stones are charged again within
the kiln for calcination.
The dust, clinkers ash and other harmful materials
are removed
from the finished product properly sorted lime is
packed and stored purchasable.
Properties of Quick lime required for AAC manufacturing :
Testing of Quicklime for AAC manufacturing :
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ReplyDeleteExcellent Article, Quicklime is used in a variety of industries, including paper and pulp manufacture, iron and steel production, water and flue gas treatment, and mining. It is made by heating crushed limestone in a shaft furnace or Rotary Kiln to roughly 1,100 degrees Celsius.
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