Rotary kiln

The use of petroluem coke and various inflammable waste materials in cement rotary kilns, increase the chemical and thermal loads on the refractory linings. In some cases, a range of mineral waste products are used as raw materials to add to the cement kilns. Major consideration when selecting alternative fuels and waste materials for cement making is the risk of increase in the chloride, alkali or sulphur content of the clinker. The cement composition can tolerate many kinds of oxide and impurities; however, high alkali and chloride levels sharply reduces the lifetime of refractory linings in cement rotary kilns. SÖRMAŞ offers full line refractory solution for the cement rotary kilns working either normal or severe service conditions.
 
 
LOWER TRANSITION ZONE                                        
                                       
Position in the kiln :                                        
        From 0,4 Ø to 2,0 Ø (in kilns with preheater)                                
        From 0,4 Ø to 1,5 Ø (in kilns with precalciner)                                
                                       
Characteristics of the zone :                                        
        Critical zone in the kiln, tire area                                
        Unstable coating                                
        Flame area                                
                                       
Loads of the zone :                                        
        Thermal      : Thermal shock, high temperature, overheating                                
        Mechanical  : Compressive stress around the tire area                                
       and abrasion by the clinker                                
        Chemical     : Volatile elements, alkaline salts, CO2,                                
       SO2/SO3 and reducing atmosphere                                
                                       
Weak points of the zone :                                        
        Shell ovalization                                
        Risk of overheating                                
                                       
Properties of refractories to be used in this zone :                                        
        High resistance to mechanical stresses and abrasion                                
        High resistance to thermal shocks                                
        High resistance to chemical attacks (by alkalines).                                 
 
Recommended grades for Lower Transition Zone  :                                
 
SORK MC 12 / SORK MC 18                                                                        
Magnesia chrome brick based on alpine sintered magnesia and chromite                        
for lower transition zone exposed to normal service conditions                        
 
SORK MSP 82 / SORK MSP 85 / SORK MSP 87                                                                
Magnesia spinel brick based on high purity seawater sintered magnesia, large crystal fused
magnesia and sintered spinel for outlet zone exposed to high thermal and mechanical loads                        
 
SORK MSP 85 S                                                                        
Magnesia spinel brick based on high purity seawater sintered magnesia and sintered spinel        
for outlet zone exposed to high thermal and mechanical loads                        
 
SORK MSP 85 F  /  SORK MSP 85 FS                                                        
Magnesia spinel brick based on high purity seawater sintered magnesia, large crystal fused
magnesia and fused spinel for outlet zone exposed to high thermal and mechanical loads          

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