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Q: What is the temperature of burning the materials in the kiln, at which the material sinters and partially fuses during the manufacture of Portland cement?
  • A. 1100°C to 1300°C
  • B. 1300°C to 1500°C
  • C. 950°C to 1100°C
  • D. 750°C to 950°C
Correct Answer: Option B - For calcination of cement, slurry is put to the rotary kiln, the slurry left form the upper of kiln passes through the following three chamber as the clinker comes out of the lower part of kiln– Dry zone–The temperature of kiln range from 25ºC to 500ºC. At this temperature, the moisture of the slurry gets blown off and it turns into a crust. Calcination zone–The temperature of kiln range 700ºC to 1200ºC the slurry change into small lump (glands) Clinker zone–The temperature of kiln range 1500ºC to 1700ºC, there reaction between calcareous and argillaceous material and formed compound changed in clinker.
B. For calcination of cement, slurry is put to the rotary kiln, the slurry left form the upper of kiln passes through the following three chamber as the clinker comes out of the lower part of kiln– Dry zone–The temperature of kiln range from 25ºC to 500ºC. At this temperature, the moisture of the slurry gets blown off and it turns into a crust. Calcination zone–The temperature of kiln range 700ºC to 1200ºC the slurry change into small lump (glands) Clinker zone–The temperature of kiln range 1500ºC to 1700ºC, there reaction between calcareous and argillaceous material and formed compound changed in clinker.

Explanations:

For calcination of cement, slurry is put to the rotary kiln, the slurry left form the upper of kiln passes through the following three chamber as the clinker comes out of the lower part of kiln– Dry zone–The temperature of kiln range from 25ºC to 500ºC. At this temperature, the moisture of the slurry gets blown off and it turns into a crust. Calcination zone–The temperature of kiln range 700ºC to 1200ºC the slurry change into small lump (glands) Clinker zone–The temperature of kiln range 1500ºC to 1700ºC, there reaction between calcareous and argillaceous material and formed compound changed in clinker.