Production of rare-earth oxides from Eskişehir-Beylikova complex ores

Abstract

In this study, the production technology of rare-earth oxides from Eskişehir-Beylikova complex ore that contains barite, fluorite, rare-earth elements, and thorium were investigated. In this study, processes that can be used in production of thorium-free mixed rare earth oxides were tested. Roasting, leaching, solvent extraction and precipitation methods were used in this study, respectively. Roasting temperature and roasting duration were determined as 600 °C and 1 hour, respectively. The optimum leaching parameters were determined as 5 M HCl, 1 hour leaching duration, 1/3 solid/liquid ratio and 35 °C leaching temperature. In the obtained leach liquor, Adogen was 464 used for removal of iron and D2EHPA was used for the removal of thorium. As a result of solvent extraction stuies, the solution containing rare earth elements was precipitated under optimum conditions. After precipitation, the product contains 99.65% rare earth oxides.