Which fertilizer is manufactured inside the byproduct recovery plant of an integrated steel mill utilizing coke oven gas?
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Answer: C. Ammonium sulphate
Explanation
Ammonium sulphate is commonly recovered as a byproduct in integrated steel mills by scrubbing coke oven gas. Sulfuric acid solutions scrub volatile ammonia out of the hot gas generated during coking operations. This pollution control step successfully transforms a hazardous gas component into a valuable fertilizer. Coking coal in steel mills releases gases containing significant quantities of toxic ammonia. Environmental regulations mandate the removal of ammonia before utilizing coke oven gas as fuel. Neutralizing the scrubbed ammonia with sulfuric acid precipitates solid ammonium sulphate crystals.
Steel manufacturing facilities generate substantial auxiliary revenue by marketing recovered ammonium sulphate. Agricultural consumers utilize this byproduct fertilizer to supply both nitrogen and sulfur to crops. Integrated industrial operations demonstrate circular economy principles by recovering valuable chemical byproducts. Option A is incorrect because urea requires high-pressure synthesis from ammonia and carbon dioxide. Option B is wrong because calcium ammonium nitrate requires limestone digestion and nitric acid. Option D is incorrect because superphosphate requires mined phosphate rock and sulfuric acid.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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