Question

The correct sequence of stages during firing/burning of bricks is

• A. Dehydration – Oxidation – Vitrification – Cooling.
• B. Vitrification – Dehydration – Oxidation – Cooling.
• C. Oxidation – Dehydration – Vitrification – Cooling.
• D. Cooling – Oxidation – Vitrification – Dehydration.

Hint:

Firing bricks involves a critical sequence of heat stages, with vitrification being the key stage that determines strength and durability.

Answer 1

The Correct Option is A

The firing process of bricks involves a sequence of temperature-related chemical changes: 1. Dehydration:
This is the initial stage where the moisture from the raw bricks evaporates under heat. The temperature typically ranges from 100 to 300°C. 2. Oxidation:
At higher temperatures, chemical reactions occur, including oxidation of organic matter in the brick material. This process usually occurs between 300°C and 600°C. 3. Vitrification:
As the temperature increases further, around 800°C to 1200°C, the clay particles melt and fuse together in a process called vitrification. This stage gives the brick its final hardness and strength. 4. Cooling:
After reaching the required temperature, the brick is gradually cooled to room temperature, allowing it to harden completely. Cooling is crucial to prevent thermal cracking. Thus, the correct sequence of stages during the brick firing process is: Dehydration → Oxidation → Vitrification → Cooling.