Sustainable recovery of rare earth elements (REEs) from alternative sources such as phosphate rock (PR) has recently gained more attention due to the growing demand for their use in clean energy technologies such as wind power, electric vehicles, and electrochemistry. This study focuses on the concentration of REEs from PR acid treatment solutions through neutralisation to induce REEs precipitation. a PR from Ülgase deposit in Estonia containing 1063 ppm of REEs and 25.3 per cent of P2Os was used for the precipitation tests. The solutions with a pH below 1.0 were obtained through a leaching process (leaching extent of REEs over 95 per cent) using HCI concentrations ranging from 0.8 M to 1 M. To precipitate REEs, the pH of the solution was gradually increased, using an alkaline solution prepared from Ca-rich oil shale ash, a waste landfilled material. a precipitate containing up to 2.3 per cent of total REEs was obtained within the pH range of 2.5-3, enriched with lanthanum (0.12-0.31 per cent), cerium (0.31-1.41 per cent), neodymium (0.13-0.33 per cent), and yttrium (0.20-0.58 per cent). The recovery extent of REEs ranged from 81 to 88 per cent. The precipitate formed contained also 10.3-12.5 per cent phosphorus, 25.4-30 per cent calcium, 6.8-8 per cent iron, and 15.6-19.35 per cent fluorine due to co-precipitation. The results of XPS analysis of the precipitate indicated that REE(3+)-compounds were present mostly in the form of REE-PO. and REE-F3. The REE concentrate was subsequently treated with oxalic acid to form REE oxalates. This process enhanced the purity of REEs concentrate, enabling selective removal of 97.7-99.1 per cent of fluorine, 94-98 per cent of phosphorus and 94.5- 99.5 per cent of iron. The overall results demonstrated that REEs can be efficiently separated from PR through leaching with low-concentration hydrochloric acid, followed by concentration via precipitation and subsequent purification of the precipitate using oxalic acid.