Fig: Manufacture of Cement by Dry Process. b) Wet Process The raw materials are firstly crushed and made into powdered form and stored in silos. The clay is then washed in washing mills to remove adhering organic matters found in clay.

Mixing and Crushing: b) Wet Process Figure showing manufacturing of cement using wet process • Limestone is crushed, powdered and stored in silos • Clay is washed with water to remove organic matter and stored in basin • Both these materials are mixed in grinding mill to formslurry • Slurry contains 38-40% water stored in correcting basin

The kiln exit gas temperature will depend on the process. Dehydration Dehydration zone zone. 450°C 450°C 800°C 800°C 840°F 840°F 1470°F 1470°F. Gas Gas Temp Temp. Calcination Calcination zone zone. 1200°C 1200°C 2190°F 2190°F. Clinkering Clinkering Cooling Cooling zone zone zone zone. 1500°C 1500°C 1750°C 1750°C 2730°F 2730°F ...

 — Clinker is cooled and ground with approximately 5 percent gypsum and other minor additives to produce Portland cement. The heart of clinker production is the rotary kiln where the pyroprocessing stage occurs.

 — A diagram of the process, which encompasses production of both portland and masonry cement, is shown in Figure 11.6-1. As shown in the figure, the process can be divided into the following primary components: raw materials acquisition and handling, kiln feed preparation, pyroprocessing, and finished cement grinding.

The most common way to manufacture Portland cement is through a dry process. The first step is to quarry the principal raw materials, mainly limestone, clay, and other materials.

Cement Manufacturing Process Flow Chart (i) Drying Zones: In the wet process, the drying zone is comparatively larger than the dry process. It is because the raw material in slurry form is directly fed into the kiln which has more amount of water.

 — Wet process of cement manufacturing (Flow chart) The length of the rotary kiln may vary anything from 30 meters to 200 meters. The slurry on being sprayed against a hot surface of a flexible chain loses moisture and becomes …

 — The processes used for the manufacture of portland cement can be classified as dry and wet. In dry process. The raw materials are first reduced in size of about 25mm in crushers and Crushed material is ground to get fine particles into ball mill or tube mill. Each material after screening is stored in a separate hopper.

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