The master's thesis is devoted to the rare earth elements obtaining from phosphoric acid solutions as by-products of apatite concentrate sulfuric acid leaching, which will increase its processing depth. The paper gives an analysis of global achievements in the field of rare earth elements obtaining, presents the technological and chemical bases of producing phosphoric acid, and outlines rare earth elements properties, main sources and applications. The purpose of the paper is to explore the solid-phase method of rare earth elements extraction using polymer-based materials impregnated or immobilized with di-2-ethylhexylphosphoric acid as an extractant. The results of the research revealed thermodynamic and technological features of the process, as well as the possibility of effective multiple use of the resins, regenerated with sodium citrate.