Summary:

For 3 TPH limestone production (Mohs 3-4), the MTW European Type Raymond Mill is the most efficient solution, offering precise 80-325 mesh control with lower energy consumption than ball mills.

Details:

Limestone Grinding Requirements

Limestone typically presents a Mohs hardness between 3 and 4. For a target output of 3 tons per hour (TPH), the mechanical load is relatively low, but efficiency depends heavily on the desired fineness, usually ranging from 80 to 325 mesh (0.173 mm to 0.045 mm). Feed size must be controlled under 25 mm to prevent liner damage and ensure stable throughput.

Recommended Solution: MTW European Type Raymond Mill

For a 3 TPH capacity, the MTW European Type Raymond Mill is the most cost-effective and technically sound choice. Unlike vertical roller mills which are optimized for high-volume 20+ TPH lines, the MTW series from Liming Heavy Industry provides the necessary centrifugal grinding force while maintaining a smaller footprint. This mill utilizes a bevel gear integral transmission, which reduces energy loss compared to traditional belt-driven models.

Technical Specifications and Performance

In a typical 3 TPH limestone circuit, the MTW110 or MTW138 models are standard benchmarks. These machines maintain a stable D90 particle size distribution with lower kWh/t consumption than ball mills. The internal air-recycling system and high-efficiency powder concentrator allow for precise fineness control without the need for external screening equipment.

• Feed Size: ≤ 30 mm

• Product Fineness: 1.6–0.045 mm (Adjustable)

• Power Efficiency: 1.2–1.5 kW per ton of limestone processed

• Maintenance: Shovel blade and roller replacement intervals exceed 1,500 hours in 3-4 hardness limestone applications.

Operational Considerations

To sustain 3 TPH, moisture content in the raw limestone should be kept below 5%. Excess moisture leads to "pasting" on the grinding ring, which chokes the airflow and drops capacity. Liming Heavy Industry's MTW mill incorporates an isolated fan and a curved duct design to minimize air resistance, ensuring that even at lower throughputs, the pneumatic transport of the 325-mesh powder remains consistent without sedimentation in the pipes.