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Flow Chart

Limestone Mining and Crushing


Limestone is quarried by drilling and blasting and is then crushed coarsely using a mechanical crusher at the quarry.The crushed limestone is delivered to the production plant by means of a purpose-built ropeway.		 Raw Material Grinding and Mixing

Limestone, silica sand and pyrite cinder are mixed and fed to raw grinding mills situated next to the limestone storage in plant to produce "raw meal". During the process of grinding, samples are tested through X-ray analyzers to ensure consistent quality. The blended raw meal is delivered into storage silos.
Calcination (Heating) and Cooling

The blended raw meal is transported by pneumatic conveyor and belt elevators to the kilns, where reinforced suspension pre-heaters are used to achieve a high degree of calcinations (oxidization of the calcium carbonate) before the raw meal enters the rotary kilns. In the rotary kilns, the preheated raw meal is completely calcined and finally sintered (or crystallized ) at 1,450℃ to form clinker. The company uses dry or semi-dry process rotary kilns which have the advantage over the wet process of large savings in heat consumption as well as increasing output.


 Clinker Grinding

From the clinker silos, the cooled clinker is mixed with gypsum and other additives fed into the grinding mills to produce various types of cement. The finished cement is pumped into cement silos.