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Quick lime

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 :

Please read in other page..




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