In the second half of 1997, our company restored the double system production of nitrophosphate based on the market conditions and achieved good economic benefits. However, due to the weakening of the national fertilizer market, product sales began to be sluggish, and there was a backlog in the off-season. Users were increasingly reflecting the problem of product agglomeration, which affected the production and sales of products and must be resolved. 1 Causes of product agglomeration Product agglomeration is due to the small amount of moisture inside the particles that diffuses to the surface, or the slow chemical reaction between the salts when the particles absorb moisture, or the dissociation and recrystallization of salts, thus between the particle surfaces Crystal bridges are formed, and cohesive forces exist between the crystal bridges and the particles, causing the product particles to coalesce into clumps. Our company's nitrophosphate product contains free water ≤1.2% (mass fraction, the same below). The main components are ammonium nitrate and ammonium phosphate, and the critical relative humidity is lower (57% at 30 degrees Celsius, lower than ammonium nitrate and ammonium phosphate). It is easy to absorb moisture and cake. Product agglomeration is mainly related to the following factors: (1) The moisture content of the product. If the product has a high moisture content or is likely to absorb moisture, salt may easily occur, and it is easy to agglomerate. (2) The particle size characteristics of the product. Small particle size, uneven size, and small void content tend to cause agglomeration. (3) The packaging temperature of the product. When the product packaging temperature is high, the solubility of the salt is large. As the temperature decreases, the solubility of the salt decreases. When the product is over-saturated, crystallization occurs, resulting in a crystal bridge and agglomeration. (4) Squeezing force received during product placement. The greater the extrusion force, the easier it is to clump. 2 Measures to solve product agglomeration (1) Reducing product moisture, preventing product moisture absorption, improving particle size distribution, lowering packaging temperature and stacking height will undoubtedly slow the caking of products, but these measures are affected by the production process of products (such as spraying Slurry concentration, granulation exhaust gas temperature, screening efficiency, etc.), equipment conditions, and storage conditions, should only be used within the limits of their capabilities. (2) Wrap the product with an anti-caking agent to form a uniform film on the surface of the product particles to prevent the product from sticking. 3 Selection of anti-caking agent We chose to apply a layer of inert material on the surface of the product particles, and achieved a satisfactory effect with the anti-caking process using mineral oil and cooked gypsum powder (semi-water gypsum) as a coating agent. 4 Product Wrapping Process (1) Process Flow After the mineral oil is pressurized by the metering pump and sprayed on the material, the surface of the material particles is firstly coated with a layer of oil film, and then the gypsum powder is continuously and evenly distributed by the screw conveyor in proportion. It is added to the surface of the material and adheres to the surface of the particles evenly during rolling. After being rolled evenly and firmly, it is packaged. (2) Raw material quality requirements Mineral oil 68# mechanical oil gypsum powder fineness 95%
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