High-temperature areas are characterized by high ambient temperature, strong solar radiation, large day-night temperature differences, and accelerated heat accumulation inside the workshop. The main risks include overheating of motors and electrical cabinets, thermal aging of seals and filter bags, powder thermal agglomeration, reduced bearing lubrication efficiency, and accelerated wear of grinding components. When selecting a calcium carbonate mill for high-temperature zones, heat dissipation, high-temperature resistant materials, electrical derating and dust system stability are the core considerations.
1. Suitable Mill Types For High-Temperature Regions
Vertical Roller Mill (VRM) — Preferred for large-scale projects
- Fineness range: 100 mesh to 2500 mesh
- Advantages: The material bed grinding method reduces direct metal friction and heat generation. The internal hot air system can be adjusted flexibly; the air circulation helps dissipate heat. The whole system works under negative pressure. It can be configured with forced cooling for bearings and lubrication stations. Ideal for GCC production for plastic masterbatch, paints and paper fillers in hot climate regions.
- Limitations: Lubrication oil cooling system must be upgraded. Electrical components need derating design under high ambient temperature.
Raymond Mill
- Fineness range: 80 mesh to 400 mesh
- Advantages: Simple mechanical structure, low heat generation during coarse grinding. Suitable for small and medium factories producing construction and low-cost plastic filler. Easy to add external cooling fans.
- Limitations: Not for ultra-fine powder. Bearings and rotary parts need high-temperature grease; regular inspection of seal aging is required.
Ultra-Fine Ring Roller Mill
- Fineness range: 600 mesh to 3000 mesh
- Advantages: Compact layout for medium-volume modified GCC production. Can adopt high-temperature resistant seals and optimized air flow to reduce heat buildup.
- Limitations: Higher internal heat when grinding ultra-fine powder. Need to control inlet air temperature and add heat insulation for the grinding chamber.
ACM Air Classifying Mill
- Fineness range: 800 mesh to 3500 mesh
- Advantages: Mainly for PCC de-agglomeration and surface modification. Closed air circuit design; can introduce cooled auxiliary air to control system temperature.
- Limitations: High rotating speed generates more heat. Filter bags and gaskets must use high-temperature resistant materials.
Fluidized Bed Jet Mill
- Fineness range: 1500 mesh to 6000 mesh
- Advantages: Low grinding heat generation due to particle-on-particle collision. Suitable for high-purity cosmetic, food and pharmaceutical calcium carbonate. The compressed air can be pre-cooled.
- Limitations: High investment; air compressor also needs heat-resistant configuration in hot areas.
Pin Mill
For pre-dispersion of agglomerated PCC. Simple structure, but rotating pins will heat up; high-temperature lubrication and seals are necessary.
2. Core Selection Criteria For High-Temperature Environments
- High-temperature resistant electrical and automation system
Ambient heat will reduce the service life of motors, PLC, sensors and cables. Motors should adopt derating design. Control cabinets need air conditioning or forced air cooling, IP54/IP65 protection. All cables, contactors and frequency converters must be high-temperature grade. - Lubrication and bearing cooling system
Bearings are the most vulnerable parts under high temperature. Select high-temperature resistant lubricating grease or independent oil cooling circulation system. Monitor bearing temperature in real time with temperature sensors and set over-temperature alarm and interlock shutdown. - Heat insulation and material selection
Add heat insulation layers on mill bodies, pipelines and dust collectors to block solar radiant heat. Seals, gaskets and filter bags must use high-temperature resistant materials, avoiding ordinary rubber that will soften and age quickly. - Optimized air flow and temperature control
Reasonable negative pressure air circulation to take away grinding heat. Avoid excessive hot air entering the system. Install temperature monitoring points on grinding chamber, classifier and dust collector. - Wear parts and anti-static design
High temperature accelerates material abrasion and static accumulation. Use high-chromium wear-resistant rollers and liners. For powder finer than 800 mesh, complete static grounding, anti-static filter bags and explosion venting protection are required. - Workshop layout and ventilation
Place the mill in well-ventilated workshops, avoid direct sunlight exposure. For outdoor installed equipment, install sunshade structures.
3. Final Recommendation
- Large-scale GCC production for plastic, paint and paper filler: Vertical Roller Mill with oil cooling and heat insulation
- Small-medium plant for coarse & medium construction filler: Raymond Mill with high-temperature grease and cooling fans
- Medium factory producing modified ultra-fine GCC: Ultra-Fine Ring Roller Mill with heat insulation
- PCC de-agglomeration and modified precipitated calcium carbonate: ACM Air Classifying Mill with high-temp filter bags
- High-end cosmetic / food / pharma grade calcium carbonate: Fluidized Bed Jet Mill with pre-cooled compressed air
JACAN provides calcium carbonate milling systems customized for high-temperature areas, including high-temperature resistant electrical components, bearing cooling system, heat insulation structure and high-temperature anti-static dust collection system.
