Vertical mills efficiently process coarse powder (80-200 mesh), Raymond mills precisely control medium and fine powder (200-400 mesh), and ultrafine vertical mills break through the 400 mesh limit. Choosing the right equipment allows calcium powder production to strike a balance between efficiency and cost.

Calcium powder particle sizes are generally classified into different grades, including coarse powder (80-200 mesh), medium-fine powder (200-400 mesh), and ultrafine powder (above 400 mesh). Different particle sizes have different requirements for equipment performance, so when selecting a model, it is necessary to comprehensively consider the finished product particle size range, particle size uniformity, production efficiency, and economic efficiency. The following are specific suggestions:

1. Coarse powder production (80-200 mesh)

● Recommended equipment: vertical mill

Reasons and advantages:

a. Integrated high-efficiency crushing and grinding: The vertical mill can directly process larger pieces of raw materials (≤50-80mm), reducing the pre-crushing process and is suitable for coarse powder processing needs.

b. Wide range of particle size adjustment: By adjusting the grinding disc gap, grinding force and classifier speed, the particle size range of 80-200 mesh can be easily adjusted.

c. Low energy consumption and high output: When producing coarse powder, the unit energy consumption of the vertical mill is lower than that of the Raymond mill (about 20%-30% lower at the same production capacity), making it suitable for large-scale production.

d. Application scenarios:

○ Calcium powder for cement industry (such as limestone powder, requiring 80-120 mesh);

○ Scenarios where coarse calcium powder is needed, such as construction aggregates and roadbed materials.

Key parameter adjustments:

● Increase the grinding roller pressure, reduce the classifier speed, and appropriately increase the air volume to control the upper limit of the finished product particles.

2. Medium-fine powder production (200-400 mesh)

● Recommended equipment: Raymond mill/vertical mill (needs to be equipped with a high-efficiency classifier)

Selection analysis:

a. Raymond mill:

○ Advantages: Traditional fine powder equipment, the finished product has uniform particle size, suitable for the range of 200-325 mesh; low investment cost and simple maintenance.

○ Limitations: When the mesh size is high (e.g. close to 400 mesh), the production capacity decreases, the energy consumption increases, and multiple grinding cycles are required.

b. Vertical mill (with dynamic classifier):

○ Advantages: By upgrading the classification system (such as using a rotor classifier), precise particle size control can be achieved, with higher efficiency than Raymond mill and stable energy consumption.

○ Applicable scenarios: fields with high requirements for particle size uniformity (such as coatings and rubber fillers).

c. Application scenarios:

○ Filler in plastic and rubber industries (requires 250-400 mesh);

○ Coating grade calcium powder for papermaking industry.

Key parameter adjustments:

● Raymond mill: Increase the classifier speed, increase the wind pressure, and control the material circulation volume;

● Vertical mill: Optimize the angle and speed of the classifier blades and adjust the grinding pressure.

3. Ultrafine powder production (above 400 mesh, such as 600 mesh, 800 mesh or even finer)

● Recommended equipment: Vertical mill + secondary classification system/ultrafine vertical mill

Selection analysis:

a. Tachima:

○ Advantages: By optimizing the grinding roller structure (such as adopting a multi-ring design) and upgrading the classification system (such as a turbine classifier), ultrafine powder with D97≤10μm (about 1250 mesh) can be achieved.

○ Limitations: The production capacity is low at high fineness and the energy consumption is high, so it needs to be combined with secondary classification equipment to improve efficiency.

b. Ultra-fine vertical mill (such as GKLMX series):

○ Advantages: Combining the high-efficiency grinding and dynamic classification technology of the vertical mill, it can directly produce 400-1250 mesh ultrafine powder with a narrow particle size distribution and lower energy consumption than traditional ultrafine grinding.

○ Applicable scenarios: high-end application fields (such as medicine, cosmetics, electronic materials, etc.).

c. Application scenarios:

○ Pharmaceutical grade calcium powder (requires high purity and ultra-fine particle size);

○ Functional filler in high-end coatings and inks.

Key parameter adjustments:

● Increase the classifier speed to the limit, reduce the grinding disc speed, use ultra-fine grinding roller lining, and control the material residence time.

4. Special particle size requirements (such as narrow particle size distribution, bimodal particle size)

● Customized solutions:

a. Double-peak particle size (e.g. 80 mesh and 400 mesh coexisting): A combined process is required, such as vertical mill coarse grinding + Raymond mill secondary fine grinding, and then separation of different particle sizes by grading equipment.

b. Narrow particle size distribution (e.g. D50 = 5μm ± 1μm): A high-precision classifier (e.g. air flow classifier) ​​is required in combination with ultrafine grinding equipment, and process parameters must be strictly controlled.

5. Comprehensive selection suggestions

1. Production capacity priority:

○ Large-scale coarse powder/medium and fine powder production: vertical mill is preferred (high efficiency and low energy consumption);

○ For small and medium-sized ultrafine powder production: choose Raymond mill (low investment cost).

2. Granularity accuracy is prioritized:

○ For extremely high requirements on particle size uniformity: choose a vertical mill with a dynamic classifier or a Raymond mill with a secondary classification system.

3. Economic considerations:

○ Single granularity requirement: select the corresponding device;

○ Frequent switching between multiple particle sizes: Vertical mill is preferred (flexible parameter adjustment and strong adaptability).

Actual case reference:

● A building materials company needs 200-mesh limestone powder: they choose a vertical mill with a production capacity of 30t/h and energy consumption of only 18kWh/t;

● A paint factory needs 800 mesh heavy calcium powder: it uses ultrafine Raymond mill + air flow classifier, with particle size D97≤10μm, but the production capacity is 5t/h, and it needs to balance efficiency and cost.

Summarize

● Coarse powder (low cost, high efficiency): vertical mill;

● Medium and fine powder (balance between efficiency and cost): Raymond mill or vertical mill;

● Ultrafine powder (high precision, high added value): ultrafine vertical mill or upgraded Raymond mill + grading system.

Key decision factors:

● Target particle size range;

● production capacity requirements;

● Requirements for uniformity of finished product particle size;

● Investment budget and long-term operating costs.

By clarifying the particle size target and combining it with the equipment characteristics, the most suitable grinding solution can be accurately selected to achieve a balance between production efficiency and economic benefits.

I hope the above supplement can help users choose equipment more scientifically based on actual granularity requirements!