Method for the manufacture of a urea-based composition comprising the addition of an additive in an aqueous form

A method for the manufacture of a homogeneous, solid, particulate, urea-based composition comprising urea and an additive, in a urea production plant comprising at least an evaporator section, and a particulation section, further comprising at least one of a mixing section, an effluent gas treatment section, and a scrubber solution storage section, wherein the method comprises at least the steps of:

• (i) concentrating, in the evaporator section, a urea melt to 95 to 99 weight % of urea;
• (ii) particulating, in the particulation section, the urea or the urea melt into a homogeneous, solid, particulate, urea-based composition, thereby producing an effluent gas comprising urea-based dust particles and ammonia gas;
• (iii) treating in the effluent gas treatment section, the effluent gas from the particulation section comprising the urea-based dust particles and the ammonia gas with an aqueous solution to produce a scrubber solution;
• and comprises steps of:
• (iv) mixing, in the mixing section the urea melt of 95 to 99 weight % with other fertilizer components to produce the urea melt;
• and
• (v) storing, in the scrubber solution storage section the scrubber solution from the effluent gas treatment section;
• wherein the additive is introduced into the urea melt or the homogeneous, solid, particulate, urea-based composition as an aqueous suspension, an aqueous dispersion, or an aqueous liquid, by adding the additive to at least one of:
• (a) said effluent gas treatment section;
• or
• (b) said scrubber solution storage section containing the scrubber solution.