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

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

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Fertiliser Technology
Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature

Very high pressure is required resulting in costly pressure vessel
None of these
Space velocity of gas is very low resulting in decreased conversion
Rate of reaction is very low

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