I. Equipment Composition of Blended Fertilizer Production Line

(1) Raw Material Storage Equipment
For large - scale production, steel - structured or concrete silos are commonly adopted, while small - scale production often utilizes hopper bins. These storage facilities are designed to store various raw materials, including urea, diammonium phosphate, etc. To avoid material shortages or overflows, level sensors are installed to monitor the inventory status in real - time.
(2) Measuring Equipment
Electronic belt scales, with an accuracy of ±0.2%, are applied to measure granular materials continuously.
Screw weighing scales are suitable for handling materials with poor fluidity.
Loss - in - weight feeders, boasting an accuracy of ±0.2%, are ideal for precisely measuring small - proportion additives.
(3) Conveying Equipment
Belt conveyors are used for long - distance horizontal transportation. Bucket elevators play a crucial role in vertical conveying. 
(4) Mixing Equipment
Twin - shaft paddle mixers can achieve rapid and uniform mixing, with a coefficient of variation less than 5%.
Plow - type mixers are designed to handle materials that are difficult to blend.
Drum mixers are more suitable for small - scale production due to their simple structure.
(5) Packaging Equipment
The automatic quantitative packaging scale can automatically complete weighing, filling, sealing and other operations according to the set weight. It has fast packaging speed and high precision and is suitable for large-size packaging. For small-size packaging, a multi-head scale combined packaging machine can be used, which can complete the measurement and packaging of multiple small packages at the same time, improving production efficiency.

II. Processing Steps of Blended Fertilizer Production
(1) Measuring and Batching
Batch materials according to the formula using measuring equipment. Measure major raw materials first, followed by additives. Regularly calibrate the equipment to ensure measurement accuracy.
(2) Mixing and Stirring
Control the mixing time according to different equipment types (3 - 5 minutes for twin - shaft mixers, 5 - 8 minutes for plow - type mixers). Adjust the rotation speed based on material characteristics and conduct uniformity tests after mixing.
(3) Finished Product Packaging
Keep the packaging weight error within ±0.2%. Inspect the appearance of the packaged products. Only after passing random sampling quality inspections can the products be stored in warehouses or sold.
(4) Quality Control and Inspection
Carry out incoming inspections for raw materials, conduct key - node inspections during production, and retain samples of finished products. Regularly maintain production equipment to ensure stable product quality.