Brick Firing Stages Sequence

The firing process for bricks involves several critical stages to transform raw clay into a durable building material. Understanding the correct sequence is essential for achieving the desired strength and properties.

The standard stages and their typical order are:

1. Dehydration: This initial stage involves removing physically and chemically bound water from the clay. Temperatures typically range from ambient up to around 650°C.
2. Oxidation: At higher temperatures (roughly 650°C to 900°C), combustible materials like carbonaceous matter and sulfur compounds are burned off. This stage is crucial for removing impurities.
3. Vitrification: As temperatures increase further (above 900°C), the clay particles begin to soften and fuse together, forming a glassy, strong ceramic bond. This stage gives the brick its strength and reduces porosity. The extent of vitrification can be controlled to achieve different brick properties.
4. Cooling: After firing, the bricks must be cooled gradually and carefully to prevent thermal shock and cracking.

Therefore, the correct sequence of stages during the firing/burning of bricks is Dehydration, followed by Oxidation, then Vitrification, and finally Cooling.

This matches Option A.