An air broyeur à jet is a type of equipment that utilizes high-speed airflow to pulverize materials into fine powders. Its performance highly depends on a range of operational parameters, which must be carefully optimized to achieve efficiency, consistency, and safety in production. Identifying the best operating conditions is essential to maximize output quality, reduce energy consumption, and extend the equipment’s service life. The following are key optimal operating conditions to consider:
Equipment and Environmental Conditions
Equipment Status: Ensure that the main unit, connecting machinery, pipelines, valves, and other components of the air jet mill are in good condition, without damage or excessive wear.
Ambient Temperature and Humidity: The air jet mill should be placed in a well-ventilated, dry, and clean area. The ambient temperature should be maintained between -5°C and 40°C, with relative humidity not exceeding 90%. A constant temperature environment is most suitable.
Power Supply Voltage: Before operation, verify that the power voltage is stable. The power outlet must have a reliable ground connection to ensure operational safety.
Operational Parameter Settings
Pulse Controller: Set an appropriate frequency and bandwidth to ensure smooth flow of the filter bag and stable airflow during the grinding process.
Compressor and Pressure Regulation: Follow the compressor’s instructions for startup and adjust the tank pressure to above 0.1 MPa.
Classifier Wheel Speed: Use the frequency converter to gradually adjust the speed of the classifier wheel from zero until the desired grinding effect is achieved.
Airflow Regulation: Close the fan control valve before starting the fan. After starting, gradually open the fan inlet valve and adjust to the required airflow level.
Material Conditions
Material Shape and Size: The air jet mill has specific requirements regarding the shape and size of materials. It is not suitable for grinding materials that are too large, too small, or irregularly shaped.
Material Moisture: Materials should have appropriate moisture content. Excessively wet materials are not suitable for jet milling.
Process Parameter Optimization
Air-to-Solid Ratio: Control the air-to-solid ratio to ensure sufficient kinetic energy of the airflow while avoiding energy waste. For instance, when crushing calcined hard materials, the ratio is typically 24:1, whereas for surface-treated materials, it is generally 12:1.
Working Medium Temperature: Increasing the temperature of the working medium can improve grinding efficiency. However, note that some surface treatment agents—especially organic ones—are not heat-resistant. Therefore, select a suitable temperature that balances effectiveness and material compatibility.
Working Medium Pressure: Higher pressure results in greater speed and kinetic energy. Choose the appropriate pressure based on the material’s crushability and fineness requirements. For example, when pulverizing titanium powder using superheated steam, the steam pressure is typically between 0.8–1.7 MPa.
Safety and Maintenance
Safe Operation: During operation, never place hands near the discharge outlet to avoid injury. Additionally, do not exceed the specified rotation speed of the classifier wheel to prevent damage to the wheel and motor.
Regular Maintenance: Perform routine maintenance on the air jet mill, including cleaning dust from the fan, replacing worn carbon brushes and blades, and checking and tightening blade screws. Also, regularly calibrate safety valves to ensure safe operation.
In summary, the optimal operating conditions for an air jet mill involve multiple aspects, including equipment and environmental conditions, operational parameter settings, material properties, process optimization, as well as safety and maintenance practices. In actual operation, adjustments and optimizations should be made according to specific circumstances to achieve the best grinding results.
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