NPK bulk blending machine, relies on physical proportioning and mixing to produce nitrogen, phosphorus, and potassium blended fertilizers. The process is simple, and the formula can be changed flexibly, making it the mainstream choice for small and medium-sized fertilizer plants. The entire process involves no chemical reactions and requires no granulation or drying.

The complete NPK blending fertilizer produciton lines consists of a feeding and conveying system, automatic batching, mixing, screening, packaging, and dust removal system. Raw materials are fed into a multi-bin batching station via a closed bucket elevator. The equipment is equipped with a high-precision weighing module that automatically measures the weight according to the preset formula, with a weighing error controlled within ±0.3%, ensuring that the nutrient ratio meets the standards. The core equipment is a twin-shaft paddle mixer or a rotary drum mixer, where materials are fully tumbled and collided inside the drum. Mixing a single batch takes only 3–5 minutes, achieving a mixing uniformity of over 95%, effectively preventing nutrient separation.

The mixed material is then screened by a drum screen to remove lumps and oversized particles. Qualified particles are sent to a fully automatic packaging machine for quantitative bagging, sealing, and coding. The entire production line is equipped with a pulse dust collector to reduce dust pollution. Combined with a PLC control system, it can store multiple formulas, and formula switching takes only about ten minutes, demonstrating a high degree of automation.

This equipment is suitable for various granular nitrogen fertilizers, phosphate fertilizers, potash fertilizers, and trace element raw materials. It requires the raw material moisture content to be ≤5% to prevent agglomeration and blockage. The equipment has a compact structure, small footprint, and low energy consumption, resulting in low initial investment and maintenance costs. Production capacity ranges from 1 to 15 tons per hour. Daily production requires controlling the feed rate, and thoroughly cleaning residual materials from the equipment when changing formulas to avoid component mixing, thereby stabilizing product quality and production efficiency.