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List the main thermal zones in a cement kiln. Describe the process in each zone. - Dehydration...

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Civil Engineering

List the main thermal zones in a cement kiln. Describe theprocess in each zone.

- Dehydration zone (up to 500°C)

- Decarbonation zone (between 500°C to 950°C)

- Solid-state reaction zone (between 950 °C to 1350 °C)

- Clinkering Zone (between 1350°C to 1500°C)

- Cooling zone

Answer & Explanation Solved by verified expert
3.8 Ratings (439 Votes)
Dehydration zone up to 450C This is simply the evaporation and removal of the free water Even in the dry process there is some adsorbed moisture in the raw mix Although the temperatures required to do this are not high this requires significant time and energy In the wet process the dehydration zone would require up to half the length of the kiln while the dry process requires a somewhat shorter distance Calcination zone decarbonation zone 450C 900C The term calcination refers to the process of decomposing a solid material so that one of its constituents is driven off as a gas At about 600C the bound water is driven out of the clays and by 900C the calcium carbonate is decomposed releasing carbon dioxide By the end of the calcination zone the mix    See Answer
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