Fuel particle size is the key factor affecting the performance,energy consumption,yield and quality of the sintering process. Particle sizes that are too coarse ( >3 mm) or too fine ( < 0. 5 mm) will reduce combustion efficiency and heat transfer effectiveness,leading to a decrease in the yield and quality of the sintered products. In order to solve the problems of uneven particle size and high fine powder content of sintered fuel that are easy to cause agglomeration and conventional screening hole blocking,and to achieve efficient removal and particle size optimization of fine powder less than 0. 5 mm,therefore a fuel air separation technology based on the principle of fluidized bed is proposed. Firstly,the physical parameters of the sintered fuel (including particle size distribution,density,moisture content and friction characteristics) are systematically measured,and the straight-hole air distribution plate is designed accordingly,and the key hydrodynamic parameters such as critical fluidization velocity,terminal velocity and suspension velocity are determined through theoretical analysis. Subsequently,a winnowing test platform is built to systematically study the effects of air supply speed,structural parameters of air distribution panel (aperture rate,inclination angle),material layer thickness and winnowing time on the separation efficiency. The results show that under the optimal parameter combination (opening rate of 5%,inclination angle of 1° ~4°,air supply speed of 15 ~ 16 m/ s,material layer thickness of 20 ~ 35 mm,and winnowing time ≥20 s),the removal rate of fine powder less than 0. 5 mm can reach more than 80%,which effectively realizes the precise control of fuel particle size. This technology not only significantly improves the combustion efficiency of fuel,but also provides a feasible pathway to achieve low-carbon transformation in the sintering process.