Ordinary calcium carbonate, also known as ground calcium carbonate for general industrial use, covers mesh sizes ranging from 60 mesh to 800 mesh. It is widely applied in construction fillers, low-grade plastic filling, feed industry, asphalt, general paints and chemical raw material additives. Its core requirements focus on stable capacity, acceptable particle size, low investment and economical operation, with relatively loose standards on trace impurities and whiteness compared with high-purity calcium carbonate. When selecting a calcium carbonate mill for ordinary calcium carbonate production, the main goal is to match your production scale and fineness requirement while controlling total cost.
1. Confirm your basic production parameters
Clarify the specifications before equipment selection to avoid over-investment or insufficient capacity.
- Target finished mesh: Ordinary calcium carbonate spans coarse, medium and low-end fine powder. Confirm whether your product is 60–100 mesh coarse powder, 200–400 mesh medium powder or 400–800 mesh fine powder.
- Hourly output: Define the required production capacity, considering raw material feeding size, stone hardness and moisture content.
- Raw material conditions: Ordinary calcite or limestone ore is commonly used. Check raw stone block size, hardness and moisture. High moisture will cause material sticking inside the grinding chamber.
- Product requirements: General ordinary calcium carbonate has basic requirements on whiteness and particle size, without strict limits on trace heavy metals.
2. Suitable mill types for ordinary calcium carbonate
- Raymond mill: The most popular and cost-effective choice for ordinary calcium carbonate. It can steadily produce powder from 60 mesh to 400 mesh. It features low initial investment, simple structure and easy maintenance, suitable for small and medium-sized production lines. With upgraded classifier, it can reach up to 800 mesh for common-grade powder.
- Hammer mill: Mainly for coarse ordinary calcium carbonate below 100 mesh. It accepts large raw stone feeding and delivers high instantaneous output. The machine is low-cost, but finished powder contains more fine fractions and poor particle uniformity.
- Vertical roller mill: Suitable for large-scale ordinary calcium carbonate plants. It can flexibly switch powder fineness from 100 mesh to 800 mesh. It has large hourly capacity and low unit power consumption, though the upfront purchase cost is higher than Raymond mill.
Note: Jet mills and high-end modified ultrafine grinding machines are not recommended for ordinary calcium carbonate. These devices have high investment and operation costs, which will reduce your profit margin for general-grade products.
3. Key evaluation factors
3.1 Capacity and particle stability
Verify whether the mill can maintain stable output and consistent particle size under continuous long-time operation. Fluctuating mesh will lead to unstable product quality and customer complaints.
3.2 Wear-resistant spare parts
Calcium carbonate ore is abrasive. Select mills with standard wear-resistant grinding rollers, rings and liners. Affordable spare parts and convenient replacement help reduce downtime.
3.3 Power consumption
Since ordinary calcium carbonate is a low-margin product, power cost accounts for a large proportion of total production cost. Compare power consumption per ton of powder among different mill models.
3.4 Dust removal system
Equip the grinding system with standard pulse dust collectors to meet local environmental emission standards. Negative pressure design prevents dust leakage and improves workshop working conditions.
3.5 Operation and maintenance
Choose equipment with simple operation. Ordinary calcium carbonate factories usually do not hire highly skilled technicians. Easy maintenance reduces labor and management costs.
4. Supplier verification checklist
- Check supplier’s mature ordinary calcium carbonate grinding project cases. Ask for on-site operation videos and user references.
- Confirm spare parts supply cycle and price of wearing parts.
- Check after-sales support, including equipment installation, operator training and troubleshooting.
- If possible, conduct trial grinding with your raw ore to test actual output and powder quality.
For small and medium factories producing ordinary calcium carbonate within 60–400 mesh, Raymond mill is the preferred solution for its good cost performance. If you run a large plant and need flexible switching between multiple powder grades, vertical roller mill is a better option. Do not blindly purchase high-end ultrafine grinding equipment for general-grade calcium carbonate, as it will bring unnecessary capital waste.
