通过实验，筛选出了合适的萃取剂，并确定了萃取级数和精馏操作的条件。
Suitable extractants are selected through experiments, and extraction degree and rectification conditions are fixed.
对多组份串级萃取理论级数计算公式进行了研究，并推导出多组份串级萃取理论级数计算公式。
Formulae for calculating the number of stages in multi-component cascade extraction are constructed in this paper.
萃取及反萃取的理论级数分别为8级和9级。
Extraction and stripping Numbers of theoretic stages are 8 and 9 respectively.
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