Method for reduction and resource utilization of rare earth acid soluble slag

The invention provides a method for reduction and resource utilization of rare earth acid-soluble slag, which comprises the following steps: strengthening silicon barium in an alkaline medium, so that the rare earth acid-soluble slag reacts with an alkaline additive under the action of high temperature to generate an acid-soluble substance; the roasted acid-soluble slag is washed with water and then is further leached in an acid solution, acid-soluble barium and rare earth ions are enriched in a leaching solution, and uranium and thorium radionuclides are subjected to solid storage in undissolved waste slag; further performing extraction separation on uranium and thorium in the leachate by adopting an extraction method, returning a solution containing barium and rare earth to a rare earth production line, and storing undissolved waste residues in a radioactive waste residue library; according to the method, the amount of the rare earth acid-soluble slag can be reduced by 80% or above, valuable elements such a