Technological method for rare earth fractional extraction and separation through adopting double feed inlets

The invention discloses a technological method for rare earth fractional extraction and separation through adopting double feed inlets, which can be used for processing a misch metal liquid formed by two kinds of liquids with the same or similar rare earth elements and a certain difference in contents of rare earth elements, and particularly is realized through two technological schemes, namely, the bastnaesite and ionic adsorption type yttrium riched europium rare earth ore Nd/Sm grouped separation as well as high-yttrium misch metal and ionic adsorption type low-yttrium misch metal Y/non-Y separation. According to the method, a reagent with phosphorous or carboxylic acids is an extraction agent, kerosene or sulfonated kerosene is an organic solvent, and hydrochloric acid is a detergent; a double feed-inlet fractional extraction system includes an extraction section, a middle section and a washing section, and an organic phase enters the fractional extraction system from the first stage; the first kind of rare earth liquid enters the fractional extraction system from the joint of the extraction section and the middle section; the second kind of rear earth liquid enters the fractional extraction system from the joint of the middle section and the washing section; cleaning solution enters the fractional extraction system from the last stage. The technological method provided by the invention has the advantages of low consumption of chemical reagent, high product purity, low waste water quantity, low cost and the like.