What are the key points of pre-processing before NPK blending fertilizer production line?
The core points of pre-processing before NPK blending fertilizer produciton line are to ensure uniform particle size, controlled moisture content, and removal of impurities. Specifically: 1. Raw material screening and impurity removal: Basic raw materials such as urea, potassium chloride, and monoammonium/diammonium phosphate are screened to remove impurities such as stones, metal fragments, and packaging bag fragments. This prevents damage to the conveying and mixing components of the NPK blending machine and prevents impurities from affecting the quality of the fertilizer product. 2. Particle size matching: Different raw materials are crushed to a uniform particle size range (usually 2-4mm). Excessive differences in particle size can lead to stratification during the blending process, affecting the uniformity of fertilizer efficacy; for raw materials that are prone to caking (such as urea and ammonium chloride), arch breaking and crushing treatment...