2026/06/10
Ammonium chloride is a commonly used nitrogen raw material. It is brittle, highly hygroscopic, and slightly corrosive. When producing it using a double roller press granualtor, it is crucial to control four aspects: raw material management, equipment protection, operating parameters, and safe operation and maintenance, to ensure molding results and the lifespan of the fertilizer production machine.
Raw material pretreatment is the primary step. Strictly control the moisture content; the raw material moisture should be stable between 8% and 14%. Excessive moisture easily leads to moisture absorption, clumping, and adhesion to the roller skin, resulting in incomplete granules and poor feeding. Insufficient moisture increases the material's brittleness, resulting in more fragments after extrusion and insufficient strength in the finished product. The raw material must be sieved to remove impurities, and a magnetic separator should be used to remove iron filings, stones, and other hard objects to prevent hard impurities from getting stuck in the roller gaps, scratching the roller skin, and causing equipment overload. Potassium chloride, monoammonium phosphate, humic acid, and other materials can be mixed for granulation as needed; a proper ratio can improve molding performance.
Operating parameters should be adjusted as needed. Fine-tune the gap between the two rollers according to the target particle size, while controlling the feeding speed to ensure that the material fills the roller gap evenly and avoids idling or localized material accumulation. Ammonium chloride extrusion molding requires no binder; pure material can be formed. Maintain uniform equipment operation during production, reduce start-stop frequency, and prevent material from becoming damp and caking inside the machine.
Focus on equipment corrosion prevention and sealing. Ammonium chloride dust and moisture can corrode the roller skin, machine housing, bearings, and seals. Use corrosion-resistant oil seals at the shaft ends, and regularly lubricate the bearing seats with grease to prevent powder intrusion. After each shift, promptly clean the roller surface and machine cavity of any residual material to prevent moisture absorption, scaling, and corrosion of parts. Regularly inspect and reapply anti-corrosion coatings to the painted surfaces and metal contact surfaces of the machine body.
In addition, maintain a well-ventilated and dry workshop to reduce ambient humidity and slow down the rate at which raw materials absorb moisture. A dust collection system should be installed to collect dust promptly, improving the working environment and preventing dust accumulation that could lead to hazards. Standardized operation and maintenance can effectively improve the granulation rate and extend the service life of vulnerable parts.
