table of contents I. 2 Primary Granulation PrinciplesII. Comparison of the 4 Main Granulator TypesIII. Key Selection Factors for Fertilizer Plants In modern organic fertilizer production lines and compound fertilizer production lines, converting loose powdered raw materials (such as fermented manure, straw compost, or urea, MAP, and potassium salts) into solid, dense, and uniformly sized […]

In modern organic fertilizer production lines and compound fertilizer production lines, converting loose powdered raw materials (such as fermented manure, straw compost, or urea, MAP, and potassium salts) into solid, dense, and uniformly sized granules (typically 2–6 mm) is critical for storage, transport, and mechanized field application. A fertilizer granulator (also known as fertilizer granulating equipment) is the core machine that performs this conversion.

As a leading organic fertilizer equipment manufacturer and compound fertilizer equipment manufacturer, Taian Hongxin Environmental Protection Equipment Co., Ltd. provides complete fertilizer processing machinery—including wet and dry granulation options—for commercial fertilizer plants globally.

I. 2 Primary Granulation Principles

Regardless of mechanical structure, all fertilizer granulators operate on one of two fundamental process principles:

1. Wet Granulation Process

   • Mechanism: Utilizes liquid binders, water, or steam alongside mechanical rotation/agglomeration forces to tumble moist powder into liquid-bound spherical pellets.

   • Downstream Equipment: Requires dedicated rotary drying and cooling equipment to reduce granule moisture.

   • Common Equipment: Rotary drum granulators, disc granulators, and wet-type organic fertilizer granulators.

2. Dry Granulation Process

   • Mechanism: Relies strictly on high mechanical pressure to compress dry powder into dense sheets or pellets without liquid additives.

   • Downstream Equipment: Eliminates the need for drying burners, dryers, or coolers, drastically reducing operational energy costs.

   • Common Equipment: Double-roller extrusion granulators and flat-die/ring-die pellet mills.

II. Comparison of the 4 Main Granulator Types

III. Key Selection Factors for Fertilizer Plants

• Raw Material Moisture & Viscosity: High-moisture (25%-40%) or fibrous organic waste favors wet drum or die extrusion granulators; dry chemical salts suit double roller granulators.

• Production Capacity Requirements: For lower yields (<3 t/h), choose disc or flat-die granulators; for large industrial capacities (>5 t/h}$), choose rotary drum lines.

• Energy Costs & Plant Footprint: Dry extrusion lines avoid rotary dryers and furnace installations, saving up to $40\%$ in capital expenditure and daily fuel consumption.