The invention discloses a clean production process of a blended
fertilizer, which comprises the following steps: preparing and selecting raw materials; performing primary
granulation on different raw materials to obtain uniform granular raw materials; performing closed ventilation storage on the granular raw materials; proportioning and metering the granular raw materials; mixing and stirring; finally, packaging is carried out, 4-5 mm particles obtained after the raw materials are subjected to
extrusion forming through a pair of rollers and subjected to primary
granulation are consistent in appearance state, air in the raw materials is removed through
extrusion, gaps are compressed, the density and
specific gravity of the formed particles tend to be uniform, and the product quality is improved. Blending layering caused by particle size,
density difference and different adsorption capacities cannot occur when the raw materials are blended, the blended compound
fertilizer meets the international general blending
fertilizer proportioning principle, the completely-homogenized blending fertilizer quality requirement can be met, the
processing cost is saved, the production efficiency is improved, and the production cost is reduced. And the problem of
caking of the raw materials is effectively solved.