Henan Hongke Heavy Machinery Co., Ltd. is proud to announce the successful completion of a Φ 3.2×30m rotary dryer project for ferrous sulfate processing in Jinchang, Gansu Province, China. This is a brand-new installation — not a refurbishment, not an upgrade of old equipment — designed from the ground up as a key component of a comprehensive industrial byproduct utilization initiative.
Project Background: Turning Byproducts into Resources
Ferrous sulfate heptahydrate (FeSO₄·7H₂O) is a significant byproduct generated during the production of synthetic rutile and titanium dioxide pigments . Our customer in Jinchang — a major industrial city in Gansu Province known for its non-ferrous metals and chemical industries — operates a large-scale synthetic rutile production facility that generates substantial volumes of this material.
The local government has been actively supporting resource utilization projects for industrial byproducts. Recent environmental impact assessments in the Jinchang area have documented major initiatives to utilize ferrous sulfate resources, including the construction of dedicated drying and processing facilities . Our customer identified an opportunity to transform their ferrous sulfate byproduct into a valuable commercial product rather than treating it as waste.
They needed a reliable, high-capacity drying system that could:
Process ferrous sulfate heptahydrate into a free-flowing, stable product
Handle the material's characteristics — ferrous sulfate is a crystalline material that requires careful drying to prevent caking and degradation
Deliver consistent output quality — meeting commercial specifications for agricultural, industrial, or water treatment applications
Operate continuously and reliably — supporting the customer's overall production schedule
The customer chose Henan Hongke Heavy Machinery Co., Ltd. because of our proven expertise in rotary drying equipment and our ability to deliver a complete, custom-engineered solution — not just a machine, but a system designed for their specific material and capacity requirements.
The Material: Ferrous Sulfate and Its Applications
Ferrous sulfate (also known as iron sulfate, green vitriol, or copperas) is a versatile chemical compound . When properly dried, it finds applications across multiple industries:
| Application | Use |
|---|---|
| Agriculture | Correcting iron chlorosis in plants; as a micronutrient in fertilizers |
| Wastewater treatment | As a coagulant and flocculent; for phosphate and hydrogen sulfide removal |
| Animal feed | Preventing iron deficiency anemia in swine, poultry, and other livestock |
| Industrial processing | As a reducing agent in hazardous waste treatment |
The drying process is critical for producing a free-flowing product. Ferrous sulfate heptahydrate crystals require removal of exterior moisture and careful control of drying conditions to maintain product quality while achieving the target moisture content .
Our Solution: Φ 3.2×30m Rotary Dryer System
Henan Hongke Heavy Machinery designed, manufactured, and installed a complete rotary drying system centered around a Φ 3.2×30m rotary dryer.
| Key Specification | Value |
|---|---|
| Dryer diameter | 3.2 meters |
| Dryer length | 30 meters |
| Material processed | Ferrous sulfate (heptahydrate / monohydrate) |
| Heating method | Direct or indirect (configured to customer requirements) |
| Capacity | Custom-engineered to the customer's target throughput |
Complete System Configuration
The project scope included the full drying production line:
1. Feeding System
A controlled feed system ensures consistent material entry into the dryer — critical for maintaining stable drying conditions and product quality.
2. Φ 3.2×30m Rotary Dryer
The core drying unit features a heavy-duty shell with a specially designed internal structure. Ferrous sulfate crystals require careful handling to prevent degradation. Our rotary dryer design incorporates lifting flights that gently tumble the material through the hot gas stream, ensuring efficient moisture removal without damaging the crystal structure. The 30-meter length provides sufficient residence time for complete and uniform drying.
3. Heating System
The system is equipped with a heat source (hot air furnace or other configuration) that provides the thermal energy needed for moisture evaporation. The temperature profile is controlled to avoid overheating, which could cause product discoloration or chemical changes.
4. Dust Collection System
A multi-stage dust collection system — typically a cyclone pre-separator followed by a bag filter — captures fine particles from the exhaust gas stream, ensuring environmental compliance and minimizing product loss.
5. Product Discharge and Conveying
After drying, the product is discharged and conveyed to storage or packaging. The dried ferrous sulfate is free-flowing and ready for commercial use.
6. Automation & Control
PLC-based centralized control monitors temperature, feed rate, rotation speed, and emissions in real time. Full data logging supports quality documentation and process optimization.
Project Completion: A New Installation, Ready for Operation
This project was completed as a brand-new installation — not an equipment upgrade, not a refurbishment of existing equipment. The entire system was engineered, manufactured, and installed as a fresh production line, incorporating the latest design features and technologies.
Key outcomes of the project:
Full system integration — All components, from feed to discharge, work together as a seamless production line
Consistent product quality — The drying system delivers ferrous sulfate product meeting commercial specifications
Environmental compliance — Dust collection ensures emissions meet regulatory standards
Operational readiness — The system is ready for continuous production, supporting the customer's overall resource utilization strategy
About Henan Hongke Heavy Machinery Co., Ltd.
Henan Hongke Heavy Machinery Co., Ltd. (Henan Hongke Machinery) has been designing and manufacturing industrial processing equipment since 2006. Our product portfolio includes:
Rotary Dryers — for ferrous sulfate, sludge, biomass, and industrial materials
Rotary Kilns — for lime, dolomite, metallurgy, and mineral calcination
Ball Mills — for ore, slag, cement, and chemical grinding
Crushers — for primary and secondary size reduction
We provide custom engineering, full manufacturing, installation guidance, commissioning support, and after-sales service for customers worldwide. We focus on one-stop solutions for mining and materials processing — complete systems that work, not just individual machines.
Building Long-Term Partnerships
At Henan Hongke Heavy Machinery, we believe that a successful project is the beginning of a long-term relationship. Our commitment to our Jinchang customer extends beyond project completion:
Technical support — ongoing advice on process optimization and troubleshooting
Spare parts availability — critical components stocked for quick delivery
Maintenance guidance — support for preventive maintenance planning
Future cooperation — we're ready to support capacity expansion or process changes as their business grows
Let's Talk About Your Drying Project
Whether you need a rotary dryer for ferrous sulfate, other chemical products, or any industrial material requiring thermal processing, we're here to help.
Contact Henan Hongke Heavy Machinery Co., Ltd. — we'll listen to your needs and deliver equipment that works, day after day.
Henan Hongke Heavy Machinery Co., Ltd.
Rotary Dryers | Rotary Kilns | Ball Mills | Crushers – Built for Reliability, Backed by Service