Disposal of waste catalysts has posed considerable threat to the environment and biological health. It has been confirmed that the self-rotation of particles in a hydrocyclone can enhance the efficiency of removing pollutants in catalyst particles. This paper presented the high-speed suspending self-rotation of catalyst particles in cyclone with the help of microfluidic technology and high-speed camera test. The oil-removal efficiency can be improved further by controlling the self-rotation speed and suspending time. Results showed that under the inlet flux of 35 m³/h, catalyst particles had a self-rotation speed of more than 14,000 rad/s in cyclone, 80 times as that of the revolution speed under the same operating condition. The self-rotation speed and suspending time of catalyst particles can be enhanced by the increase of inlet flux and cone angle. The coating oil is removed under the periodic resultant centrifugal force when the suspending time is prolonged, and the oil content can be reduced from 36.17% to less than 4% within 100 s in cyclone under 25 °C. This finding is highly significant to non-thermal purification of waste catalyst under gas–solid environment.

废物催化剂的处理对环境和生物健康构成了巨大威胁。已经证实，水力旋流器中颗粒的自转可以提高去除催化剂颗粒中污染物的效率。本文借助微流控技术和高速相机测试技术，介绍了旋风分离器中催化剂颗粒的高速悬浮自转。通过控制自转速度和中止时间，可以进一步提高除油效率。结果表明，在入口流量为35 m ^{3的情况下}/ h，催化剂颗粒在旋风分离器中的自旋转速度大于14,000 rad / s，是相同操作条件下旋转速度的80倍。入口通量和锥角的增加可以提高催化剂颗粒的自转速度和悬浮时间。当悬浮时间延长时，在周期性的离心力作用下去除涂层油，并且在25°C下旋风分离器中，油的含量可以在100 s内从36.17％降至4％以下。这一发现对于在气固环境下对废催化剂进行非热纯化具有重要意义。