The nitrophosphate process is similar to the wet process except that it uses nitric acid in place of sulfuric acid.
2.
Due to the alterations of the process by the various companies who employed it, the process is now generally referred to as the nitrophosphate process.
3.
Due to the byproduct ammonium nitrate which has lower value, the production of ammonium nitrophosphate fertilizer is not economical compared to diammonium phosphate which is produced from cheaper sulfuric acid or gypsum.
4.
In the nitrophosphate process or Odda process ( invented in 1927 ), phosphate rock with up to a 20 % phosphorus ( P ) content is dissolved with nitric acid ( HNO 3 ) to produce a mixture of phosphoric acid ( H 3 PO 4 ) and calcium nitrate ( Ca ( NO 3 ) 2 ).
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