fertilizer production line

NPK fertilizer production line

A comprehensive guide: What is an NPK blending fertilizer production line?

fertilizer granulator Feb 2, 2026

An NPK blending fertilizer production line is essentially a complete equipment system for processing bulk blended fertilizer (BB fertilizer). Its core function is to precisely and uniformly mix nitrogen, phosphorus, and potassium fertilizers with micronutrients according to a pre-set formula, producing customized blended fertilizers. It is a crucial production platform connecting raw materials with precise fertilization needs.

The production line operates through four core units. The raw material pretreatment unit is responsible for screening, crushing, and removing impurities from the single-element fertilizers, eliminating lumps and ensuring uniform particle size, laying the foundation for mixing. The metering and batching unit is the core, automatically adding materials according to the formula using precise weighing equipment, with an error controlled within ±1%, ensuring accurate nutrient ratios.

The mixing and finished product processing unit handles subsequent processes. The mixing process primarily utilizes double shaft paddle mixers or BB fertilizer mixers, employing strong convection principles to achieve rapid blending of raw materials, resulting in a nutrient variation coefficient of less than 3% and preventing localized nutrient enrichment. After screening to remove impurities, the finished product is packaged by fertilizer packaging machines or directly sent to bulk silos, adaptable to various storage and transportation scenarios.

Its core advantage lies in flexible production. Unlike the fixed formulas of compound fertilizer production lines, it can adjust the formula in real time based on soil data and crop nutrient requirements, quickly switching between different formulations. Furthermore, the level of automation in the production line can be configured as needed, catering to the production needs of both small and medium-sized workshops and large enterprises.

In summary, the NPK blending fertilizer production line is not a single piece of equipment, but a precise and flexible complete system. Through the collaborative efforts of its various units, it achieves integrated production, providing solid capacity support for precision fertilization in modern agriculture.

NPK fertilizer production line

NPK fertilizer mixing guide: Key points for controlling uniformity

fertilizer granulator Jan 13, 2026

The uniformity of NPK fertilizer blending directly determines the stability of its effectiveness and is a critical link in the production of high-quality compound fertilizers on NPK fertilizer production lines. Blending requires considering raw material characteristics, operating procedures, and equipment suitability to avoid nutrient stratification and excessively high local concentrations.

Raw material pretreatment. Nitrogen, phosphorus, potassium, and trace element raw materials should be crushed separately to 80-100 mesh to ensure uniform particle size and prevent sedimentation; moisture content should be controlled at 8%-12% to avoid caking or excessive dust affecting mixing. Impurities should also be removed to protect core equipment such as fertilizer mixers and ensure product purity.

Controlling mixing sequence and proportion accuracy. Follow the principle of “fine before coarse, light before heavy, and pre-mixing small amounts of auxiliary materials”: first add fine and light raw materials such as urea to the fertilizer mixer machine, then add coarse and heavy raw materials such as potassium chloride; small amounts of auxiliary materials such as trace elements should be pre-mixed and diluted with fine materials before being added to the main system to prevent local enrichment.

Equipment operation and time control. Prioritize the use of a double shaft paddle mixer, controlling the rotation speed at 25-35 r/min, and adjusting the mixing time to 5-10 minutes according to the amount of raw materials to avoid insufficient or excessive mixing (excessive mixing can easily lead to stratification). Discharge the material promptly after mixing to reduce the residence time in the equipment and prevent secondary caking.

Mixing quality verification. Sampling should be conducted using the “quartering method” to ensure that the nutrient variation coefficient is ≤5%; if the standard is not met, check the raw material pretreatment, mixing sequence, or fertilizer mixer parameters, and optimize and adjust accordingly.