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Phosphogypsum is a by-product of

  • A.the granulation of urea
  • B.the mining of potash
  • C.the wet phosphoric acid process
  • D.the ammonia synthesis loop itself

Answer: C

About five tonnes accompany each tonne of phosphorus pentoxide produced, and it usually carries a trace of radium from the rock. Stacking it is the common disposal route and a continuing liability. Its volume dwarfs that of the acid produced.

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