Chemical and Biological Technologies in Agriculture

Table 2 Conditions used for steam drying versus air drying comparison

From: A slow release nitrogen fertiliser produced by simultaneous granulation and superheated steam drying of urea with brown coal

Drying method	Granulation method	Urea-BC nitrogen content
Air, ambient temperature	Lab granulation	UBC-L
Air, ambient temperature	Lab granulation	UBC-H
Air, ambient temperature	Lab granulation	UBC-M
Air 105 °C 1 h	Lab granulation	UBC-M
Air 130 °C 1 h	Lab granulation	UBC-M
Steam 105 °C 60 %RH 1 h	Lab granulation	UBC-M
Steam 130 °C 60 %RH 1 h	Lab granulation	UBC-M
Steam 105 °C 100 %RH 1 h	Lab granulation	UBC-M
Steam 130 °C 100 %RH 1 h	Lab granulation	UBC-M
SHS drum pilot trial	SHS drum pilot trial	UBC-M

UBC urea-brown coal granule at low N (L), high N (H) or medium N (M) content; SHS superheated steam

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