method of preparation of pearls and pearls of urea from urea through the implementation of this method.

摘要

Making urea prills of good impact strength by allowing drops of substantially water-free urea melt to fall, counter current to a cooling gas, through a cooling zone in which a dispersion of crystalline particles with dimensions of between 2 and 10 micron, preferably between 4 and 8 micron, in a quantity of 8-25 mg per m3 of cooling gas, in maintained. …??The particles may be obtained by grinding crystalline urea.