Sulfur/Wax Coating Machine (SCU)
The Professional-Grade System for Producing Premium Controlled-Release Fertilizers
The Sulfur/Wax Coating Machine (SCU) is a sophisticated, multi-stage coating system engineered specifically for the production of Sulfur-Coated Urea (SCU) and other sulfur-coated fertilizers. It precisely applies layers of molten sulfur and a sealant wax onto fertilizer cores, creating a robust, semi-permeable physical barrier. This technology is key to manufacturing Enhanced Efficiency Fertilizers (EEFs) that provide controlled nutrient release, reduce environmental losses, and improve crop uptake efficiency.
Key Features
Advantages
Applicable Raw Materials & Coating Materials
Basic Structure & Components
Raises the temperature of urea prills to prevent thermal shock and improve sulfur adhesion.
Heats and maintains sulfur at a precise molten state (approx. 140-150°C).
The core unit where molten sulfur is sprayed onto tumbling urea prills. Often a specialized rotary drum with spray headers and an integrated cooling air draft.
Cools the freshly sulfur-coated granules to solidify the coating, typically using a flow of ambient air.
Heats the sealant wax and applies it via a separate spray system.
A secondary rotary drum where wax-coated granules are gently tumbled to distribute the wax evenly and seal surface imperfections in the sulfur layer.
Cools the finished product to ambient temperature for storage.
Captures any sulfur or wax fumes and particulates.
Integrates control of all thermal, mechanical, and process parameters.
Technical Data
Parameter | Model SCU-5 | Model SCU-10 | Model SCU-20 |
Capacity (t/h, finished SCU) | 3-5 | 8-12 | 18 – 25 |
Sulfur Coating Weight (% target) | 15% – 30% (Adjustable) | 15% – 30% (Adjustable) | 15% – 30% (Adjustable) |
Wax Coating Weight (% target) | 1% – 3% (Adjustable) | 1% – 3% (Adjustable) | 1% – 3% (Adjustable) |
Sulfur Melting Capacity (kg/h) | ~1,000 | ~2,500 | ~5,000 |
Overall Power Consumption (kW) | ~65 | ~140 | ~260 |
Release Period (typical range) | 30 – 120 days | 30 – 120 days | 30 – 120 days |
Note: Capacity and coating weights are highly customizable based on desired product specifications. Release period is a function of coating thickness and formulation. | |||
Key Differentiators vs. Other Coaters
A specialized, high-temperature system for solid coatings, not a general-purpose liquid coater. It creates a thick, multi-layered barrier for controlled release, whereas a rotary coater applies thin, functional layers for anti-caking or dust control. The process complexity, thermal management, and capital investment are significantly higher for the SCU system.
Utilizes elemental sulfur as the primary, cost-effective barrier material, followed by a wax sealant. Polymer coatings are often solvent-based or require different curing mechanisms. The SCU process is a well-established physical coating method with distinct agronomic release mechanisms.
Provides a true, sealed coating through molten application and wax sealing, resulting in a predictable release profile. Simple drum mixers that apply sulfur powder do not achieve proper adhesion or sealing, leading to unreliable and immediate release.
It is the definitive production system for manufacturing high-quality Sulfur-Coated Urea, a leading product in the physical controlled-release fertilizer market. It represents an investment in advanced fertilizer technology and sustainable agriculture solutions.