Discussion
The residue specification for raw meal exists because too coarse a meal
Answer: A
Correct answer: will not react completely during burning in the kiln
The reactions in the burning zone are between solid particles and depend on diffusion over the distance a particle spans, so a coarse grain of silica cannot combine fully in the time available. The result is uncombined lime in the clinker, and the residue specification exists to keep the coarse fraction small enough to react.
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