The core of optimizing the organic fertilizer granulation process revolves around a closed loop of "raw material compatibility - equipment parameters - finished product quality - efficiency and cost." Considering the characteristics of organic fertilizer—high fiber content and moisture sensitivity—the following process is used for precise optimization, balancing granulation rate and nutrient retention:

I. Pre-Optimization Preparation

Define core objectives: Finished product granule strength ≥ 2.5 kg/granule, granulation rate ≥ 85%, moisture content 10%-15%, and 2-5 mm particle size percentage ≥ 90%. First, determine the raw material parameters (organic matter content, C/N ratio, moisture content) and confirm the existing organic fertilizer granulator type (disc/drum/extrusion type) to avoid parameter and equipment compatibility discrepancies.

II. Core Optimization Steps

1. Raw Material Pretreatment Optimization: Use specialized crushing equipment to crush raw materials such as straw and livestock manure to 80-100 mesh, then mix them thoroughly using a twin-shaft mixer. If the fibers are too coarse, add 5%-10% humic acid or other binders. Adjust the moisture content according to the type of granulator (58%-62% for disc/drum granulation, 45%-50% for extrusion granulation) to avoid clumping or low pellet yield.

2. Granulation Equipment Parameter Optimization: For disc granualtors, adjust the tilt angle to 45°-55° and the rotation speed to 20-30 r/min, simultaneously controlling the feed and water spray volume. For drum granulators, optimize the liner and scraper angle to 15°-20° and the drum rotation speed to 15-25 r/min to improve material tumbling uniformity. For extrusion granulators, replace the die with a 2-5mm diameter die, adjust the pressure roller pressure to 10-15 MPa, and regularly clean the holes to prevent clogging. Simultaneously, add 2%-5% binder according to the raw material characteristics to balance formability and nutrient concentration.

III. Optimization, Verification and Improvement: First, the parameters were verified through small-scale tests on a small granulator, and then the stability was monitored for 24-48 hours in a pilot production line. The quality of finished products and equipment energy consumption were tracked over a long period of time, and dynamic fine-tuning was carried out according to changes in raw material batches to form a standardized operation manual.