CEMENT BURNING: FIXED KILNS. 



475 



In European practice Candlot states that an Aalborg kiln will turn 

 out 10 to 15 tons of clinker per day, with a fuel consumption of 280 Ibs. 

 coal per ton of product. 



Fio. 111. Dietzsch kilns. 



Hauenschild kiln. The Hauenschild kiln is a simple cylinder, charged 

 at the top with both fuel and mix. It differs from a cylindrical lime- 

 kiln only in having two distinct walls, with a space between. This annu- 

 lar space is used either for drying the mix or for heating the air to be 

 supplied to the kiln. The result is that the interior lining is kept fairly 

 cool, so that the charge does not clinker in masses against the walls: 



