Carbon Steel Pelletizer for Compound Fertilizer​

Product Overview

The Ring Die Compound Fertilizer Pelletizer is a core equipment in compound fertilizer production lines, using ring die extrusion technology to produce high-strength granules from mixed organic and inorganic materials. The machine’s ring die (made of stainless steel 304) features precision-drilled holes (2-8mm diameter) that shape the material into uniform granules, ensuring consistent nutrient distribution (variation ≤5%) across each granule. A forced feeding system—equipped with a spiral auger and agitator—prevents material bridging in the hopper, ensuring continuous production with minimal downtime. It’s suitable for both small workshops (1-ton/h model) and large industrial plants (10-ton/h model), supporting the production of customized compound fertilizers with specific NPK ratios (e.g., 15-15-15, 10-20-10).

Product Features

High Granule Strength: Produces granules with compressive strength ≥15N (tested per GB/T 23348-2020 standard), which meets international transportation requirements (ISO 8398) and reduces granule breakage to ＜3% during long-distance shipping. This strength also prevents clumping in storage, even in high-humidity environments (relative humidity ≤85%).

Wide Raw Material Adaptability: Handles organic-inorganic mixes with 20-80% organic content, including combinations of animal manure (organic), urea (nitrogen), superphosphate (phosphorus), and potassium chloride (potassium). It can also process mineral additives such as zeolite and humic acid to enhance fertilizer functionality.

Large Capacity: Models range from 1-10 tons per hour to match different production scales. The 1-ton/h model (power 18.5kW) is suitable for small-scale operations, while the 10-ton/h model (power 75kW) is designed for industrial lines with continuous 24/7 operation. All models support modular expansion (e.g., adding a cooling unit) for full-line automation.

Easy Maintenance: Quick-wear parts (ring die, pressure rollers, cutter) feature a bolt-on design that allows replacement within 1 hour using standard tools—no special training required. The machine’s lubrication system (centralized grease pump) automatically lubricates key components every 30 minutes, extending part life by 40%.

Applications

NPK compound fertilizer production integrating organic and chemical nutrients, catering to cash crops (vegetables, fruits, flowers) that require balanced nutrition for high yields and quality.

Bulk blending fertilizer (BB fertilizer) granulation—converting powdery BB fertilizer into granules to improve flowability and prevent nutrient segregation during transportation and spreading.

Large-scale fertilizer plants supplying commercial agricultural fertilizers, as the machine’s high capacity and stability support mass production with consistent quality.

Specialized fertilizer production, such as slow-release compound fertilizers (by adding polymer coatings to the granules) and bio-organic compound fertilizers (by incorporating beneficial microbes into the mix).

FAQ

Q: What’s the moisture content of finished granules?

A: Final moisture content is controlled at ≤12% for long-term storage (6-12 months) without mold growth. The extrusion process naturally reduces moisture by 3-5% through friction, and an optional cooling unit can further lower moisture to ≤10% for humid regions.

Q: Can it add micro-nutrients during granulation?

A: Yes, it supports precise addition of trace elements (Zn, B, Fe, Mn, Cu, Mo) at concentrations of 0.1-2%. The forced feeding system ensures uniform mixing of micro-nutrients with the main material, avoiding nutrient hotspots in the final granules. A micro-dosing unit (optional) is available for accurate control of small additive amounts.

Q: How to adjust granule diameter?

A: Replace ring dies with different apertures (2mm for seedling fertilizer, 8mm for field crop fertilizer) based on application needs. Ring dies are available in standard sizes (2mm, 3mm, 4mm, 6mm, 8mm) and can be custom-made for special diameters (1-10mm) with a 7-day lead time.