Ultrafine powder (typically defined as particles <4μm) is a critical control parameter in powder processing. Taking lithium-ion battery anode materials as an example, excessive <4μm ultrafine powder content after petroleum coke grinding can lead to reduced compaction density and lower battery capacity; increased specific surface area may trigger side reactions that impair cycle life; and slurry viscosity fluctuations can result in uneven coating.

      When processing petroleum coke with traditional classified mechanical mills, high-speed impact from the grinding disc generates turbulence, causing fine particles to be repeatedly ground within the grinding zone. As a result, the <4μm ultrafine powder content typically ranges from 3% to 8% (Source: Publicly available industry technical data). Although classification wheels can separate coarse particles, they cannot fully prevent over-grinding of fines, often necessitating additional downstream classification equipment, which increases both capital investment and operating costs.

      Jet mills processing petroleum coke typically yield a <4μm ultrafine powder content between 2% and 5% (Source: Publicly available industry technical data). While this represents an improvement over classified mechanical mills, it may still exceed the requirements of certain high-end processes. Moreover, energy consumption rises significantly as particle size decreases; when grinding to D50=4μm, comprehensive energy consumption can reach 80–100+ kWh/ton (Source: Publicly available industry technical data), resulting in high operating costs.

      The Lingzhi Rotary Tooth Ultrafine Grinder utilizes an internal screen combined with a centrifugal forced discharge mechanism to achieve an "exit-upon-compliance" principle, effectively minimizing unnecessary material residence time in the grinding zone. For petroleum coke, internal testing and validation by partner organizations have demonstrated that the <4μm ultrafine powder content can be stably maintained below 2%. This performance indicator helps enhance downstream process stability, improve product consistency, reduce scrap rates, and decrease reliance on additional classification equipment.