Process for the production of urea-comprising particles
Process for the production of urea-comprising particles, wherein the urea-comprising particles are produced in a pelletizer, comprising a feeding device, a belt and a device to remove the formed pellets from the belt, by feeding a urea-comprising liquid to the feeding device from which droplets of the urea-comprising liquid are dosed to the belt, whereon the urea-comprising droplets solidify and cool to a temperature of ≦55° C., whereafter the formed urea-comprising particles are removed from the belt.
1. Process for the production of urea-comprising particles, comprising:
(a) providing a pelletizer which comprises a feeding device, a belt and a removal device to remove formed pellets from the belt,
(b) feeding a urea-comprising liquid to the feeding device and causing droplets of the urea-comprising liquid to be discharged from the feeding device and dosed onto the belt,
(c) solidifying the urea-comprising liquid droplets dosed onto the belt by cooling the droplets on the belt to a temperature of ≦55° C. to thereby form solid urea-comprising particles therefrom, and
(d) removing the formed solid urea-comprising particles from the belt by means of the removal device.
2. Process according to claim 1 , wherein the urea-comprising liquid is a urea melt.
3. Process according to claim 2 , wherein the urea melt comprises ≧99 wt. % urea.
4. Process according to claim 1 , further comprising cleaning the belt after removing the urea-comprising particles from the belt according to step (d).
5. Process according to claim 1 , wherein the urea-comprising liquid contains an additive.
6. Process according to claim 5 , wherein the additive is a formaldehyde solution or a reaction product of urea and formaldehyde.
7. Process according to claim 1 , wherein the urea-comprising liquid is a mixture of urea with another fertilizer.
8. Process according to claim 7 , wherein the urea-comprising liquid is a mixture of urea with ammonium sulphate.
9. Process according to claim 8 , wherein the urea-comprising liquid is a mixture of urea with >30 wt. % ammonium sulphate.