All about Cement
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Manufacturing process

From the limestone quarry to the delivery of the end product, follow every step in the cement manufacturing process.

Step 1: extraction and preparation of raw materials

The raw materials needed to produce cement are extracted from our quarries (limestone, clay, schist, etc), after thorough geological research and chemical analysis in specific quantities and proportions.

 

These raw materials are crushed through a milling process and then transported to the plant. 

 

Step 2: raw grinding and burning

Grinding produces a fine powder, known as raw meal, which is preheated and then sent to the kiln.

 

The kiln is at the heart of the manufacturing process and in order to heat the materials, a 2,000°C flame is required. Once inside the kiln, the raw meal is heated to around 1,500°C. At this temperature, chemical reactions take place to form cement clinker.

 

Upon exiting, the clinker is cooled and stored ready for grinding to produce cement.

 

CO2 and cement

Why does the manufacture of cement produce CO2?
Cement manufacturing is the source of 5% of global carbon dioxide (CO2) emissions. The cement making process necessarily entails the release of carbon dioxide:

  • 60% of emissions are due to the transformation of raw materials at high temperatures (the "decarbonation" of limestone),
  • 40% result from the combustion required to heat the cement kilns to 1500°C.

Step 3: cement grinding and shipping

Clinker and gypsum are very finely ground giving cement. During this phase, different mineral materials, called additives may be added alongside the gypsum. Used in varying proportions, these additives give the cement specific properties.

 

Finally, cement is stored in silos before being shipped in bulk or in bags to the sites where it will be used.

 

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Enhanced Cements

Heracles GCCo, pioneer in the differentiation of cement products in the Greek market, offers to the market the new enhanced reactivity cement series HeraclesTM Ενισχυμένο and BasisTM Ενισχυμένο. Driven by innovation for the development of materials and solutions for the construction sector, Heracles has implemented, for the first time in Greece, the innovative technology of separate grinding in the cement production. 

Industrial ecology

How to create value from waste

Large amounts of natural resources, particularly minerals and fossil fuels, are used to manufacture cement. For many years the Group has been working to reduce the environmental impact of its activities by finding ways to obtain value from waste products.

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LafargeHolcim. Cement, aggregates, Concrete.