Quasi-rectangular cascade separation method, rectangular cascade improvement method and application thereof

The invention discloses a rectangular cascade improvement method, which does not change the cascade structure of rectangular cascade, and only changes the reflux quantity of an end stage in the rectangular cascade, so that the operation condition of the rectangular cascade is simply and conveniently improved, and the purpose of stable operation of the rectangular cascade is achieved. The invention further provides a quasi-rectangular cascade separation method. The method is improved on the basis of a rectangular cascade separation method. By applying the separation method, the content of impurities fed into the end stage can be reduced, the cascade operation stability can be improved, the isotope enrichment degree in substances taken out from the end stage can be improved, and the separation effect can be improved. 本发明公开了一种矩形级联改善方法，该方法不改变矩形级联的级联结构，只改变矩形级联中端部级的回流量，从而简单便捷的改善矩形级联运行工况，达到矩形级联稳定运行的目的。还提供了一种准矩形级联分离方法，该方法是在矩形级联分离方法的基础上进行的改进提升。应用该分离方法，不仅可以降低供入端部级的杂质含量，提高级联运行稳定性，还可以提高从端部级取出的物质中的同位素富集程度，提高分离效果。