Welcome to Lanco Industries Limited
 
 
   
 

LANCO CEMENT

 

Lanco Cement is the result of a unique blend of slag and clinker with the following destructive characteristics.

 
Progressively increasing later stage strength.
100% no leakage & no honey combing on application.

Low heat of hydration, very low pore volume in concrete, high impermeability, resulting in structures of high strength & long life.

Crack free structure & walls, result of low thermal stresses and absence of differential volume change.
Super resistance to sulphate in concrete, resultant low corrosion, less alkali aggregate reaction, and final outcome of long lasting super finish surfaces.
East workability with high concentration of fines.
 
 

Wide range application from domestic to industrial, piling foundation, marine constructions, coastal area buildings, roads, bridges and any for all other special purposes.

   
   
 

MANUFACTURING PROCESS ?CEMENT

   
 

Cement is manufactured at LIL to profitably make use of the slag from the MBF. Hence a mini cement manufacturing facility has been conceived. Out of various processes available for mini cement plants, Vertical Shaft Kiln (VSK) process is found to be more viable & economical, hence it is more popular. Accordingly VSK process has been chosen.
   
 

Crushing and grinding:

 

Limestone obtained from the mine in boulders form of 8 to 10 inch size is crushed in crushers to 10 mm size. The same, along with coke fines (15 to 20% of clinker), clay and iron ores are fed into a raw mill (usually a ball mill) & ground into powder & stored in silos. Chemical composition of all materials & size distribution are checked at every stage.

   
 

Nodulizing :

 

In VSK technology of cement manufacturing, nodulizing is the most important step. Nodulization means agglomeration of all uniform small size particles to form large nodules. Since fuel is interground in the raw meal, for uniform sintering (clinkering) nodulization is very important & critical. Nodulization is done in a specially designed dish revolving at an angle. Ground rawmeal is fed to the dish which is revolving & water is sprayed to convert the powder into globules called nodules. Perfect nodulization is achieved by having proper size of fuel, size of dish, angle of inclination of dish & the spread of water jets sprayed.

   
 

Clinkering:

 

Nodules made, called the blackmeal, are fed into the vertical shaft kiln. The nodules are converted into clinker by sintering of the meal by blowing control air supplies by rootblower. The various zones of reactions starting from the top of the kiln are the drying zone, calcining zone, sintering zone & cooling zone. Clinker thus made is stacked in hoppers, using belt conveyors.

   
 

Slag drying:

 

Usually, the slag coming out of slag granulation plant of a blast furnace or MBF has a moisture content of 20 to 25%. It needs to be dried before grinding. A rotory dryer is installed for this purpose which uses hot flue gas from the air preheaters of MBF.

   
 

Cement Grinding:

 

Clinker, gypsum & slag are fed into the cement mill (ball mill), after passing through proper weighing & feeding mechanism. The grinding steel balls grind the cement to required fineness. Over size materials will return for regrinding. Gypsum is added in the range of 2 to 3% to regulate the setting property of cement.

   
 

Packing:

 

The cement stored in silos is packed in bags of 50 Kgs using an automatic double sprouted packing machine.

   
 

Quality Control:

 

Tests are carried-out at every stage for required chemical & physical properties such as composition, strength, fuel value, setting properties, nodulisation, roundness etc. Cement is manufactured to national standards.

   
 

Dust control:

 

Since fine material is handled after crushing, bag dust filters are installed at raw mill grinding, slag drying, clinker transporting, cement grinding & cement packing.

   
   
 
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