Selecting the appropriate compound fertilizer extrusion granulation production line involves matching your own production capacity needs, raw material characteristics, and investment budget, while also considering environmental protection and subsequent operation and maintenance. The decision-making process can follow these specific steps:

1. Clarify core requirements: Anchor production capacity and product positioning

First, determine the target production volume and lock the production line scale based on "hourly output" or "annual output" (refer to previous production ranges). For small-batch production (e.g., annual capacity of 30,000 to 100,000 tons), select a small-scale line; for large-scale mass production (e.g., annual capacity of 100,000 to 500,000 tons), choose a medium-scale line; and for nationwide supply (annual capacity exceeding 500,000 tons), opt for a large-scale line.

Clarify product specifications, such as particle size (commonly 2-5mm), shape (cylindrical/elliptical), and whether multi-formula compound fertilizers need to be produced. This will influence the selection of rollers and the configuration of the batching system.

2. Adapting to Raw Material Characteristics: Avoiding Pelletization Challenges

Regarding the moisture content of the raw materials, if the material is too dry (moisture content <8%), a humidification device should be equipped; if it is too wet (moisture content >15%), a pre-drying step may be necessary, or a moisture-resistant extrusion pelletizer should be selected.

Considering the hardness of the raw material, high-hardness materials (such as potassium chloride crystals) require enhanced front-end crushing equipment, paired with wear-resistant rollers, to prevent excessive equipment wear.

If multiple raw materials (such as nitrogen, phosphorus, potassium + organic fertilizer) need to be mixed, a high-precision batching system (batching accuracy ≥ 0.2%) and an efficient mixer should be selected to ensure uniform fertilizer efficacy.

3. Balancing Investment and Operations: Controlling Costs and Risks

Classify equipment tiers based on budget: small-scale lines (0.6-3 tons/hour) require lower investments (hundreds of thousands), suitable for startups or small workshops; medium to large-scale lines (above 4 tons/hour) involve investments ranging from millions to tens of millions, necessitating decisions based on financial strength and payback period.

Prioritize equipment with low energy consumption and easy maintenance, such as ambient temperature granulation machines (eliminating the need for drying processes), to reduce subsequent electricity costs. Opt for brands with high compatibility of spare parts to facilitate the replacement of wear-prone components (e.g., rollers and screens) in the future.

4. Compliance and Environmental Protection: Align with Policy Requirements

Verify whether the production line complies with local environmental standards, such as no dust leakage (requiring dust removal equipment) and no wastewater discharge, to avoid forced shutdowns due to non-compliance with environmental regulations.

If the production site is located in an urban area or residential zone, equipment with strong sealing capabilities and low noise levels should be selected to minimize the impact on the surrounding environment.

5. Assess Manufacturer Capabilities: Ensuring After-Sales Service and Compatibility

Select manufacturers with mature case studies, prioritize examining existing production lines of the same scale and raw material type, and assess equipment operational stability and actual production capacity compliance.

Confirm whether the manufacturer offers customized services, such as adjusting equipment parameters based on raw material characteristics and optimizing layouts according to site size, while ensuring installation, commissioning, personnel training, and post-sales maintenance support.