The manufacturing of calcium ammonium nitrate (CAN) uses raw materials including NH3 and__________________?
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Answer: A. HNO3 & limestone
Explanation
Calcium ammonium nitrate production utilizes nitric acid to digest natural limestone mineral raw materials. The resulting calcium nitrate solution is subsequently neutralized using anhydrous ammonia gas feeds. Blending these components creates a stable, safe nitrogen fertilizer containing beneficial calcium. Limestone provides a safe alkaline carrier that moderates the explosive potential of pure ammonium nitrate. Nitric acid is essential for dissolving limestone and supplying the nitrate component of the fertilizer. Ammonia neutralization completes the chemical conversion required to produce commercial CAN granules.
Farmers widely apply calcium ammonium nitrate to acidic soils to supply both nitrogen and calcium. The product is favored for its non-combustible safety profile compared to straight ammonium nitrate. European agriculture relies heavily on CAN fertilizers to prevent soil acidification during crop production. Option B is incorrect because carbon dioxide and sulfuric acid are used in urea and sulfate production. Option C is wrong because ammonium chloride is an entirely different nitrogen fertilizer formulation. Option D is incorrect because potassium nitrate utilizes potassium sources rather than limestone.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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