How to prevent pulverization and secondary granulation of urea-based compound fertilizer particles during drying

Here are a few suggestions for the poster: First, don’t rely too much on electronic scales; instead, verify the weights physically and keep track of the weighing coefficients. Second, study the compatibility of different materials – some materials should not be mixed together as this can lead to low-temperature fusion and the formation of sticky substances, resulting in nutrient loss within the system. Third, what is the quality of granulation? The condition of the granules has a significant impact on quality; please pay attention to the moisture content of the product after cooling. If two-stage drying is used, it’s possible to employ two stages with low temperatures and high air flow. If only one stage is used, moisture levels need to be monitored regularly to prevent issues such as insufficient moisture or increased moisture content, which can lead to a decrease in overall content and fluctuations in nutrient levels. Additionally, what is the theoretical basis for DAP decomposing into phosphoric acid when heated? High temperatures can cause urea to break down into large amounts of potassium-binding substances, leading to higher potassium levels; theoretically, nitrogen levels should also increase. However, due to excessive heat, some ammonia escapes, resulting in lower nitrogen levels or values that are lower than actual levels. Therefore, your low-temperature treatment method should be fine. Furthermore, adding too much water leads to secondary granulation inside the dryer, resulting in large particles and powder, which can cause fluctuations in nutrients.