Improvements in and relating to the prilling of urea
Granules of urea are formed by passing heated discrete quantities of urea at a temperature above its melting point into a body of a denser liquid, e.g. Woods metal or Lipowitz alloy, which is maintained at a lower temperature than the urea's melting point, and collecting urea granules from an u...
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| Sprache: | eng |
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| Zusammenfassung: | Granules of urea are formed by passing heated discrete quantities of urea at a temperature above its melting point into a body of a denser liquid, e.g. Woods metal or Lipowitz alloy, which is maintained at a lower temperature than the urea's melting point, and collecting urea granules from an upper free surface of the denser liquid. Any metal stuck to the surface of the granules is removed by tumbling them in a rotary screen, passing them through a highly concentrated solution of urea, then through a centrifuge. Two forms of suitable apparatus are described. |
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