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Fertiliser Technology

Fertiliser Technology
Commercial fertilisers are available mostly in the form of

Lumps
Flakes
Grannules
Powder

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Fertiliser Technology
Phosphoric acid is produced in wet process from phosphate rock and

Dilute H₂SO₄
Concentrated NHO₃
Concentrated H₂SO₄
Concentrated HCl

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Fertiliser Technology
Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the

Presence of an oxidising atmosphere
Presence of a reducing atmosphere
Presence of an inert atmosphere
Absence of air

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Fertiliser Technology
Gas based fertiliser plants use

Natural gas as a source of hydrogen
Coal gas as heating medium
Coal gas as a source of hydrogen
Natural gas as heating medium

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Fertiliser Technology
Reaction of anhydrous liquid ammonia with orthophosphoric acid produces

Superphosphate
Triple superphosphate
None of these
Ammonium phosphate

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Fertiliser Technology
Low grade phosphate rock can be used in electrical furnace, because

It is cheap
CaO content is less
Of the better CaO/SiO₂ balance for slag formation
It produces low cost product

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