50,000-ton/year NPK Compound Fertilizer Production Line: Equipment Configuration and Complete Process Flow

 NPK compound fertilizer is a major agricultural fertilization product. A 50,000-ton/year production line is considered medium-scale, offering the advantages of controllable investment and high output. This article systematically analyzes the overall picture of a standardized 50,000-ton/year NPK compound fertilizer production line from three dimensions: equipment configuration, process flow, and site investment.

I. Core Equipment Configuration

A complete 50,000-ton/year NPK compound fertilizer production line typically consists of eight systems:

Automatic Batching System: Employs high-precision electronic belt scales or loss-in-weight batching scales to automatically weigh and proportion raw materials such as urea, monoammonium phosphate, and potassium chloride, with a measurement error controlled within ≤1%.

Mixing System: Uses a twin-shaft paddle mixer or horizontal mixer with a processing capacity of 8-10 tons/hour, ensuring a nutrient distribution uniformity of over 95%.

Granulation System: The core equipment is a rotary drum granulator with a drum diameter of 1.2-2.2 meters, a production capacity of 5-8 tons/hour, and a pelletizing rate ≥90%. Rotary drum granulators are suitable for large-scale continuous production, producing high pelleting rates and good granule strength, making them the preferred solution for high-concentration NPK compound fertilizers. Disc granulators or roller extrusion granulators can also be selected depending on the raw material characteristics.

Drying and Cooling System: A rotary dryer equipped with a hot air furnace provides heating, with a temperature controllable between 80-120℃, reducing granule moisture content to below 2%. A rotary cooler uniformly cools the high-temperature granules to near room temperature, preventing agglomeration. Screening System: A multi-layer vibrating screen separates qualified granules of 2-4mm or 3-5mm. Unqualified large granules are crushed and returned to the granulation system, while fine powder is directly recycled back to the furnace.

Coating and Packaging System: A rotary coating machine sprays an anti-caking agent, improving granule brightness and moisture resistance. A fully automatic quantitative packaging scale has an accuracy of ±0.2%, and is equipped with sewing and coding equipment.

Environmental Protection and Dust Removal: Cyclone dust collectors or pulse bag dust collection systems are installed at all crushing and screening nodes, achieving a dust absorption efficiency of over 99%.

II. Process Flow The standard process flow for a 50,000-ton/year NPK compound fertilizer production line is as follows: Raw material batching → Mixing and blending → Crushing and agglomerating → Granulation → Primary screening → Granule drying → Granule cooling → Secondary screening → Finished product coating → Quantitative packaging.

Raw materials typically include nitrogen sources such as urea, ammonium nitrate, ammonium chloride, and ammonium sulfate; phosphorus sources such as monoammonium phosphate and diammonium phosphate; and potassium sources such as potassium chloride or potassium sulfate, with the proportions determined according to market demand and soil testing results. After batching, the materials are mixed evenly in a mixer, then crushed by a chain crusher to remove agglomerates, and subsequently fed into a rotary drum granulator. The semi-finished product after granulation undergoes a primary screening; unqualified granules are returned to the mixing stage; qualified granules enter a dryer for dehydration and hardening, and then are cooled in a cooler; after a secondary screening, qualified products undergo coating treatment in a coating machine, and finally are quantitatively packaged and stored by an automatic packaging scale.

The 50,000‑ton‑per‑year NPK compound fertilizer production line represents a sweet spot between investment scale and output efficiency, and its success hinges on the seamless integration of every process stage. It starts with precise npk fertilizer raw materials processing—weighing and proportioning urea, phosphates, and potash salts—followed by rigorous npk fertilizer formula processing to meet target nutrient ratios. The homogeneous blend then enters the core npk fertilizer granulator machine (typically a rotary drum granulator) where steam and controlled temperature create uniform granules, while auxiliary equipment like crushers and screens ensure consistent particle size. After granulation, the material undergoes npk fertilizer drying and cooling to lock in strength and moisture content, before final screening and coating. This entire npk fertilizer manufacturing process is orchestrated within a complete npk fertilizer production line that also includes automated batching, mixing, and packaging systems. For producers who also require blending services, an npk bulk blending machine can be integrated to produce custom blends from the base granules. All these units—from the mixer to the dryer, from the granulator to the packer—are unified under the control of advanced npk compound fertilizer machine systems, ensuring stable operation, low energy consumption, and consistent product quality. With a well‑designed 50,000‑t/y line, manufacturers can achieve a rapid return on investment while meeting the growing market demand for high‑grade compound fertilizers.

III. Summary: The 50,000-ton-per-year NPK compound fertilizer production line follows a standardized process of "batch production → mixing → granulation → drying and cooling → screening → coating → packaging." Core equipment includes an automatic batching scale, a twin-shaft mixer, a rotary drum granulator, a rotary dryer and cooler, a vibrating screen, and an automatic packaging machine. This scale of production line offers moderate investment and a reasonable payback period, making it an ideal choice for medium-sized fertilizer producers looking to expand and upgrade. If you are planning a 50,000-ton-per-year NPK compound fertilizer production line, please contact us—we provide a complete turnkey project from automatic batching, twin-shaft mixing, rotary drum granulation to drying and cooling, screening and coating, and automatic packaging. Our professional team will be on-site for installation and commissioning, helping you quickly build a standardized compound fertilizer production line with controllable investment and high output.