Manufacture of cement – There are four stages in the manufacture of portland cement: (1) crushing and grinding the raw materials, (2) blending the materials in the correct proportions, (3) burning the prepared mix in a kiln, and (4) grinding the burned product, known as ” clinker,” together with some 5 percent of gypsum (to control the time of set of the cement).
- The three processes of manufacture are known as the wet, dry, and semidry processes and are so termed when the raw materials are ground wet and fed to the kiln as a slurry, ground dry and fed as a dry powder, or ground dry and then moistened to form nodules that are fed to the kiln.
- It is estimated that around 4–8 percent of the world’s carbon dioxide (CO 2 ) emissions come from the manufacture of cement, making it a major contributor to global warming,
Some of the solutions to these greenhouse gas emissions are common to other sectors, such as increasing the energy efficiency of cement plants, replacing fossil fuels with renewable energy, and capturing and storing the CO 2 that is emitted. In addition, given that a significant portion of the emissions are an intrinsic part of the production of clinker, novel cements and alternate formulations that reduce the need for clinker are an important area of focus.
What is cement grinding process?
Cement Grinding – Clinker is extracted from our clinker tank and transported to the cement mill hopper by belt conveyors. A measured quantity of clinker and gypsum is fed into our closed-circuit ball mill which incorporates with a high-efficiency separator.
- OPC is produced by the inter-grinding and blending of 95% clinker with 5% gypsum to a fineness of 280 m 2 /kg.
- PPC is produced by the inter-grinding and blending of 65% clinker with 30% fly ash and 5% gypsum to a fineness of 320 m 2 /kg.
- Fineness is a controlled parameter for cement to ensure better hydration and strength development.
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Is cement processed or manufactured?
From the extraction of the raw materials to the grinding of the end product, cement manufacturing is a complex process. – From the limestone quarry to the delivery of the end product, follow every step in the cement manufacturing process.
What are the raw materials used for manufacture of cement?
Limestone and clay are the raw materials that are used in manufacturing cement. When they are strongly heated, they get fused together and form cement clinker. This clinker is then mixed with 2−3 by weight with gypsum to form cement.
How many steps are there in manufacturing of concrete?
1. Batching – It is the main thing in the Concrete Manufacturing Process. The measurement of materials like aggregates, cement, water necessary for preparing different grades of is Batching. It is by two processes. One is volume and other is weight batching.
How is cement manufactured Class 11?
The cement is manufactured by crushing naturally occurring minerals such as limestone, clay and gypsum through a milling process.Q. Cement is a man-made material used in building.