Ceramic – Glass
Raw materials for Glass Manufacturing:
Solvay’s Process – Lime Calcination :
Lime Calcination is a multi-purpose step in the Solvay’s process. This step is essential to produce milk of lime production and equally important in generating excess Carbon dioxide that is used in the carbonation process. So while selecting a kiln for lime calcination we should keep in minds that the kiln should be able to generate maximum amount of carbon dioxide. Generally for lime calcination rotary, vertical shaft or annular kilns are used. Of these types the best suitable for the soda ash Solvay’s process is Vertical Shaft kiln as this kiln can produce about 35 to 40% of Carbon dioxide where as the other kilns can generate only about 25% of carbon dioxide. Also only the vertical shaft kiln only can give maximum thermal efficiency when compared to the other kilns. Also other kilns need a highly quality limestone as their design demands raw material of uniform and small particle size. However the vertical shaft kiln can handle a wide particle size distribution and also has the design advantage of providing reserve gas capacity of several hours without loss of kiln control.
To be Contd….
