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What are the four main stages of portland cement manufacturing?
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Cement
The cement-making process, from crushing and grinding of raw materials, through roasting of the ground and mixed ingredients, to final cooling and storing of the finished product.
The manufacture of portland cement involves four primary stages:1
- Crushing and grinding: Raw materials are extracted and processed by crushing and grinding them into a fine state, either wet or dry, depending on the production method.12
- Blending: The materials are blended in precise proportions to achieve the required chemical composition, using silos for dry processes or slurry tanks for wet processes.13
- Burning: The prepared mixture is heated in a kiln at high temperatures, resulting in the formation of small nodules known as clinker.14
- Final grinding: The clinker is ground into a fine powder along with approximately 5 percent gypsum, which is added to regulate the cement's setting time.15
Because cement production is a significant contributor to global warming due to carbon dioxide emissions, the industry is actively pursuing ethical solutions such as improving energy efficiency, utilizing renewable energy, and developing alternative formulations to reduce the reliance on clinker.14