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Mixed fertilizers contain two or more of
the elements nitrogen, phosphorous and potassium that are essential for good
plant growth and greater crop yields. This document addresses the production
of ammonium phosphates nitro phosphates potash and compound fertilizers.
Nitro phosphate fertilizers are made by digesting phosphate rock with
nitric acid. The resulting solution is cooled to precipitate calcium nitrate
which is removed by filtration. The filtrate is neutralized with ammonia and
solution is then evaporated to reduce the water content. Periling may
follow. The calcium nitrate filter cake can be further treated to produce a
calcium nitrate fertilizer, pure calcium nitrate, or to give ammonium
nitrate and calcium carbonate Nitrophosphate fertilizers are also produced
by mixed acid process. Digestion of phosphate rock by a mixture of nitric
acid and phosphoric acid.
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