Defluorination method of ionic type rare earth cascade extraction production line soap stock

The invention discloses a defluorination method for soap stock of an ionic type rare earth cascade extraction production line, which comprises the steps of soap stock acquisition, defluorination reaction, filtration, pH regulation, oxalic acid transformation, firing and the like, realizes defluorination of the ionic type rare earth cascade extraction production line, improves the recycling rate of rare earth resources, reduces the loss of rare earth, and reduces the production cost of the ionic type rare earth cascade extraction production line. The fluorine-containing waste liquid is discharged after being treated by an enterprise sewage treatment process and reaching the standard. After the method is adopted for defluorination, the impurity content of the high-purity single rare earth feed liquid led out from the cascade extraction production line is low, so that the purity of the finally obtained single rare earth oxide product is improved, the production benefit is remarkable, and particularly when a rare