Gas diffusion cascade for preparing silicon-28 isotope with abundance of 99% or above by using silane as medium

The utility model relates to a gas diffusion cascade for preparing silicon-28 isotope with abundance of more than 99% by taking silane as a medium. The gas diffusion cascade comprises a plurality of gas diffusion separation devices and high-speed magnetic suspension gas compressors located in front of the gas diffusion separation devices in the flowing direction of silane gas. And obtaining the silicon-28 isotope with the abundance of more than 99% by taking silane as a medium from the light fraction end of the gas diffusion cascade. 本实用新型涉及一种用于以硅烷为介质制备丰度为99％以上的硅-28同位素的气体扩散级联。该气体扩散级联包括：多个气体扩散分离装置，和在硅烷气体的流动方向上位于每个所述气体扩散分离装置之前的高速磁悬浮气体压缩机；从所述气体扩散级联的轻馏分端得到以硅烷为介质制造丰度为99％以上的硅-28同位素。