The roller extrusion granulator plays a key role in the NPK (nitrogen phosphorus potassium compound fertilizer) production line, and its performance directly affects the quality and production efficiency of the product. To improve the granulation effect, we can start from the following aspects:
1. Control the moisture content of raw materials
Optimal humidity: Ensure that the raw materials entering the roller extrusion granulator have a suitable moisture content, usually 10% -15%. Too high or too low can affect the forming rate and strength.
Uniform mixing: The raw materials should be thoroughly stirred to ensure consistent moisture content in each part of the material, avoiding clumping or unevenness.
2. Optimize the formula
Add adhesive: Add clay, starch, or other natural adhesives appropriately to improve particle stability and reduce breakage rate.
Balanced ingredients: Accurately proportioning nitrogen, phosphorus, potassium, and other trace elements to ensure balanced nutrition for each particle.
3. Adjust machine parameters
Pressure and speed: Adjust the pressure and speed of the drum according to the properties of the raw materials, and find the most suitable combination to achieve the ideal compaction effect.
Gap setting: Adjust the gap between two rollers, usually set between 0.8mm and 1.5mm, to ensure consistency in particle size.
4. Temperature control
Preheating treatment: In some cases, slight heating of the raw material can help soften certain components, making them easier to form, but be careful not to exceed the material’s tolerance limit.
5. Post processing
Cooling and solidification: After being squeezed by the roller extruder, the newly formed particles require appropriate cooling time to solidify their shape and reduce the possibility of subsequent crushing.
Screening and grading: Use a vibrating screen to remove unqualified large particles or fragments, ensuring uniform product specifications.
6. Daily maintenance
Cleaning and maintenance: Regularly clean the accumulated residue inside and outside the roller extrusion granulator machine, lubricate key components, extend service life, and maintain efficient operation.
Monitoring worn parts: Regularly inspect the surface of the roller and other vulnerable parts, and replace them if necessary to avoid a decrease in granulation effect due to wear.
7. Continuous optimization
Data collection and analysis: Record the data of each production, including raw material conditions, machine parameters, finished product indicators, etc., for analysis and optimization.
Technical training: Regularly provide professional training to operators to update their knowledge of the latest technologies and best practices.
Through the above measures, the granulation effect of the roller extrusion granulator on the NPK fertilizer production line can be significantly improved, thereby enhancing overall production efficiency and product quality. In practice, multiple experiments and fine-tuning may be necessary to find the best solution that best suits specific raw materials and production needs.