Abstract:The La/CePr/Nd extraction process of the rare earth plant production extraction line A was taken as the research object. By collecting and analyzing the content of rare earth elements in the organic phase and aqueous phase at all levels of the extraction tank, the effects of different saponification organic phase flow, feed liquid flow, acid flow and other conditions on the content distribution of rare earth elements at all levels and the total amount of rare earth elements were determined. Properly increasing the saponification organic phase flow, feed liquid flow and acid flow can make the content of La at the outlet of the aqueous phase higher, thus ensuring the purity of the exported product. However, it will make the content of Ce component higher and the content of Pr, Nd component lower in the organic phase at the outlet of grade 55 organic phase, increasing the pressure for the next series of separation of Pr and Nd.