| http://www.w3.org/ns/prov#value | - This object is realized, according to the invention, by spraying an aqueous urea solution having a urea concentration of 70-99.9% by weight, on to fluidized urea nuclei in the form of droplets having a mean drop diameter of 20-120 ??m, preferably 100 ??m and in particular 30-60 ??m and a temperature at which the water evaporates from the solution sprayed on the nuclei and urea cristallizes on the
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