Henan Hongke Heavy Machinery Co., Ltd. is pleased to announce the successful shipment of a Φ2.2×7m ball mill for steel slag processing to a customer in Inner Mongolia, China. This project demonstrates our capability to deliver robust, high-performance grinding solutions for challenging industrial byproducts.
The Challenge: Steel Slag Grinding
Our customer operates a steelmaking facility in Inner Mongolia, generating significant volumes of steel slag — a byproduct with well-known grindability challenges. Steel slag contains oxide-based phases such as MgO, FeO, MnO, and CaO that possess high hardness and inter-particle solid bonding, resulting in significant resistance to fracture during milling . The variability in slag composition — influenced by steel type, raw materials, and smelting processes — further complicates milling operations .
The customer faced several operational issues with their existing equipment:
Low throughput — unable to process sufficient tonnage for their utilization targets
High energy consumption — steel slag's poor grindability drove up power costs
Inconsistent product fineness — poor particle size control affected downstream application
Frequent wear-related downtime — abrasive slag caused rapid liner and media wear
They needed a ball mill system capable of processing 20 tons per hour with stable product quality and reduced operating costs. Research has shown that particle size of steel slag has a pronounced impact on its carbonation rate for CO₂ utilization applications — smaller particle sizes enable higher absorption rates . This made achieving consistent fine grinding a key priority.
Our Solution: Engineered for Steel Slag
Henan Hongke Machinery does not sell generic ball mills. Every system is matched to the material characteristics and production targets.
For this 20 TPH Inner Mongolia project, we designed a Φ2.2×7m steel slag ball mill with the following key features:
Technical Specifications
| Parameter | Value |
|---|---|
| Mill diameter | 2.2 meters |
| Mill length | 7 meters |
| Capacity | ~20 tons per hour |
| Feed size | Customized to customer requirements |
| Discharge fineness | Adjustable to spec |
| Main motor power | 400–500 kW (matched to customer need) |
| Drive type | Edge gear drive or center drive |
Custom Design Features
1. Heavy-Duty Liner System
Steel slag is highly abrasive. We equipped this mill with high-wear-resistant liners — medium chrome alloy or upgraded materials — to extend liner life and reduce replacement frequency. For slag with high Fe content or complex oxide phases, we can specify manganese steel or ceramic-enhanced liners .
2. Optimized Grinding Media Gradation
A carefully calculated ball charge (size distribution matched to the slag's hardness and feed size) maximizes breakage efficiency while minimizing over-grinding. Research indicates that planetary ball milling significantly outperforms other mill types for steel slag particle breakage — up to 39% higher efficiency .
3. Efficient Drive System
The mill features a heavy-duty gear drive with reliable torque delivery. The main motor and reducer combination is sized for continuous 24/7 operation, with auxiliary drive available for maintenance positioning.
4. Robust Shell Construction
The drum shell is fabricated from Q235-B steel plate with adequate thickness to handle the high impact loads of steel slag grinding . The shell is designed to withstand the wear and stress of continuous operation.
5. Complete System Package
We supplied a fully integrated system including:
Rotary part (shell with end covers)
Feeding and discharging devices
Main bearing assemblies
Drive system (motor, reducer, pinion, girth gear)
Lubrication system (thin oil station)
Control cabinet and starting cabinet
Key Performance Benefits
| Feature | Benefit |
|---|---|
| Heavy-duty liners | Extended wear life; less downtime for replacement |
| Optimized ball charge | Higher grinding efficiency; consistent product fineness |
| Efficient drive system | Lower energy consumption per ton processed |
| Robust shell construction | Long equipment life under continuous operation |
| Complete integration | Quick installation; single-source responsibility |
Steel Slag: A Resource, Not Waste
Steel slag is increasingly recognized as a valuable resource rather than a waste stream. Properly ground steel slag powder can be used in:
Cement and concrete production — as a supplementary cementitious material
Road construction — as aggregate
CO₂ sequestration — through carbonation, where steel slag reacts with CO₂ to form stable carbonates
Soil improvement — as a mineral fertilizer
Achieving the right particle size distribution is critical for these applications. Research confirms that particle size has a more pronounced impact on carbonation rate compared to other factors — smaller particles mean higher CO₂ absorption rates . This makes efficient fine grinding a key enabler for sustainable slag utilization.
About Henan Hongke Heavy Machinery Co., Ltd.
Henan Hongke Heavy Machinery Co., Ltd. (Henan Hongke Machinery) is a leading Chinese manufacturer of industrial processing equipment with over 12 years of experience. Our product portfolio includes:
Rotary Kilns — for lime, cement, metallurgy, and mineral calcination
Rotary Dryers — for sludge, biomass, and industrial materials
Ball Mills — for ore, slag, cement, and chemical grinding
Crushers — for primary and secondary size reduction
We serve customers across China and international markets, offering custom engineering, full manufacturing, installation guidance, and after-sales support.
Conclusion
The Φ2.2×7m steel slag ball mill is now on its way to Inner Mongolia. Once commissioned, it will process approximately 20 tons of steel slag per hour, turning a challenging industrial byproduct into a valuable resource for cement, construction, or carbon sequestration applications.
If you're processing steel slag, ore, or other abrasive materials — and need a ball mill engineered for your specific material and throughput targets — contact Henan Hongke Heavy Machinery Co., Ltd.
We deliver engineered solutions, not just equipment.
Henan Hongke Heavy Machinery Co., Ltd.
Rotary Kilns | Dryers | Ball Mills | Crushers – Engineering Excellence for Global Industry