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Henan Hongke Heavy Machinery Co., Ltd. has successfully shipped a Φ2.2×7m ball mill for steel slag grinding to a customer in Inner Mongolia. This case study presents the technical specifications and performance characteristics of the system.
Application Context
Steel slag — a byproduct of steelmaking — presents significant grinding challenges due to its high hardness (oxides of CaO, MgO, FeO, MnO) and variable mineralogy depending on feedstock and process conditions. Efficient comminution is essential for downstream applications including cementitious materials, road aggregates, and CO₂ sequestration.
The customer required a consistent 20 TPH throughput with stable product fineness, lower energy consumption, and reduced maintenance interruptions.
Equipment Specification
| Parameter | Value |
|---|---|
| Mill type | Overflow or grate discharge (configured per application) |
| Shell diameter | 2.2 m |
| Shell length | 7.0 m |
| L/D ratio | ~3.2 : 1 |
| Capacity (design) | 20 TPH |
| Main motor power | 400–500 kW |
| Drive configuration | Edge gear drive with auxiliary positioning drive |
| Rotation speed | Variable (matched to grinding kinetics) |
| Shell material | Q235-B steel plate |
| Liner type | Medium-chrome alloy (wear-resistant) |
| Grinding media | Forged steel balls, size-graded per customer ore |
| Lubrication | Thin oil station with forced circulation |
Engineering Features
| Feature | Engineering Rationale |
|---|---|
| Heavy-duty shell | Q235-B with optimized thickness for impact and fatigue resistance |
| Medium-chrome liners | Hardness matched to slag mineralogy; extends relining intervals |
| Optimized ball charge | Calculated for specific slag hardness to maximize breakage rate and minimize over-grinding |
| Efficient edge drive | Reliable torque transmission with lower maintenance than center-drive alternatives |
| Forced lubrication | Ensures bearing protection under continuous 24/7 operation |
| Sealed discharge | Minimizes dust ingress; cleaner operation |
Performance Data
| Parameter | Achieved / Projected |
|---|---|
| Throughput | ≥20 TPH (steady-state) |
| Product fineness | Adjustable (80% passing <75 μm typical) |
| Specific energy consumption | ≤28–32 kWh/t (material-dependent) |
| Liner service life | ≥8,000 operating hours |
| Mechanical availability | ≥95% |
System Scope
The delivered package included:
Rotary mill shell with end covers
Feed and discharge assemblies
Main bearings (self-aligning spherical roller type)
Girth gear and pinion drive
Main and auxiliary motors
Reducer and coupling set
Thin oil lubrication station
Electrical control panel with soft-start
Operational Advantages
The Φ2.2×7m steel slag ball mill offers:
Higher wear resistance — liners matched to abrasive slag
Lower energy per ton — optimized media and drive efficiency
Consistent product quality — stable fineness for downstream processing
Rederved maintenance — robust components extend service intervals
Enhanced uptime — 95+% availability supports continuous production
About Henan Hongke Heavy Machinery Co., Ltd.
Henan Hongke Heavy Machinery Co., Ltd. (Henan Hongke Machinery) is a Chinese manufacturer of industrial processing equipment since 2006, specializing in rotary kilns, dryers, ball mills, and crushers. We provide engineered solutions with full technical support, from sizing to commissioning.
Summary
The Φ2.2×7m steel slag ball mill is now en route to Inner Mongolia. It is designed to deliver 20 TPH of consistent, fine-ground slag for resource recovery applications — turning a challenging industrial byproduct into a valuable feedstock.
For ball mill systems engineered to your material and throughput specifications, contact Henan Hongke Heavy Machinery Co., Ltd.
Henan Hongke Heavy Machinery Co., Ltd.
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