Large-scale Limestone Ultrafine Grinding Project in Morocco

Project Background

Morocco is a strategic hub for non-metallic mineral processing in North Africa. The client, a leading regional construction material supplier, aimed to upgrade their production to high-value ultrafine powders. The goal was to supply the premium paint, paper, and plastic modification industries through an efficient Limestone ultrafine grinding process.

Core Project Parameters:

Material: Limestone (Calcium Carbonate)
Equipment: Epic Powder Ball Mill + Vertical Multi-Rotor Classifier System
Target Fineness: D90} = 5 – 10 μm
Production Capacity: 20 t/h
Applications: Industrial fillers, specialty coatings, and paper-grade fillers.

Core Challenges & Solutions

1. Scaling Capacity with Ultra-precision

Achieving a 20 t/h output while maintaining a D90 between 5 and 10 microns (equivalent to 1250–2500 mesh) is a significant technical challenge for traditional classification systems.

The Solution: Epic Powder utilized a Ball Mill + Multi-Wheel Classifier configuration. By using multiple high-efficiency classifying rotors working in parallel, the system ensures a massive air-to-powder ratio even at ultra-fine settings, breaking the capacity bottleneck typical of single-rotor systems.

2. Energy Efficiency: Reducing Power Consumption per Ton

In large-scale mineral processing, electricity is the primary operational cost.

The Solution: The ball mill’s internal liner geometry and grinding media graduation (size mixing) were optimized. Combined with an advanced frequency control system, the line reduces energy consumption per ton by 15% – 20% compared to conventional grinding technologies.

3. Wear Resistance and Whiteness Protection

While limestone has moderate hardness, prolonged friction during ultrafine grinding can introduce metallic contaminants that dull the powder’s color.

The Solution: The system uses high-alumina ceramic liners in the ball mill and zirconia ceramics or high-polymer wear-resistant materials for the classifier wheels. This comprehensive ceramic protection ensures the equipment’s longevity and preserves the natural whiteness of the limestone.

Performance Results

Metric	Target Requirement	Actual Result
Fineness (D90）	5 – 10 μm	4.8 – 9.5 μm
Hourly Capacity	20 t/h	22.5 t/h (Exceeded)
System Uptime	> 90%	95% (Supports 24/7 operation)
Whiteness Loss	< 0.5%	Negligible