Rapid bed reaction method for ultrafine particles and rapid reaction bed

The invention relates to a rapid bed reaction method for ultrafine particles and a rapid reaction bed. The rapid reaction bed comprises a cyclone separator, and a bottom outlet of the cyclone separator is communicated with a top inlet of the cyclone separator through a descending pipe, a conveying pipe, a lifting pipe and a connecting pipe; and materials are fed from a feeding port in the upper section of the descending pipe, enter the conveying pipe through the descending pipe, are heated in the conveying pipe, then enter the lifting pipe, ascend together with reaction gas introduced from a gas inlet in the lower section of the lifting pipe, are continuously mixed and react, a gas-solid mixture is fed into the cyclone separator through the connecting pipe after being discharged from the lifting pipe and is subjected to gas-solid separation through the cyclone separator, a solid powder enters the conveying pipe again to be subjected to the circulation process many times, and the reacted material is discharged