Geochemical Characteristics And Leaching Experiments Of Rare Earth Elements Associated With Xiangshan Uranium Deposit

Rare earth elements are important strategic resources and have been applied in many fields.Some ore bodies of Xiangshan uranium deposit have a high content of rare earth elements,especially thc heavy rare earth elements.Research on the geochemical characteristics of rare earth elements enriched in Xiangshan uranium mine is beneficial to the recovery and utilization of rare earth resources,and exploration of thc enrichment mechanism of rare earth elemens.Through field investigation in the study area,and chemical analysis and leaching experimentof the ore,the enri chment mechanism of rareearth element in xiangshan uranium mine was studied,and the following results were obtained:?1?The geochemical analysis of trace elements shows that the content of rare earth elements associated with uranium deposits was very high,and the total amount of rare earth elements in the rich rare earth uranium deposits had approached or reached the industrial grade,which had good comprehensive recovery value.The distribution pattern of rare earth elements was obviously Eu negative anomaly.The distribution pattern of rare earth elements in surrounding rocks was light rare earth enrichment type,while the mineral body was heavy rare earth enrichment type.The reason for the enrichment of rare earth elements in ore bodies was that the enrichment of rare earth elements,especially heavy rare earth elements,was accompanied by uranium mineralization.?2?The reason for the enrichment of U elements in ore bodies was that the enrichment of rare earth elements,especially heavy rare earth elements,was accompanied by uranium mineralization.In terms of major elements,P₂O₅ was positively correlated with REY,HREE+Y and LREE,indicating that apatitization plays a certain role in promoting the enrichment of rare earth elements,and the correlation between dark minerals such as MgO and MnO and rare earth elements was not obvious.?3?The analysis of the rare earth leaching behavior under the sulfuric acid system show that the leaching effect was best when the reaction time of 90 min,sulfuric acid concentration of 30 g/l,the temperature was 70 degrees Celsius,solid-liquid ratio of 1/5,magnetic stirrer speed of 500 r/min,the added antioxidant?hydrogen peroxide,30%?5 ml for every 100 ml reaction liquid,while the rare earth oxide leaching rate was 83.23%,rare earth leaching rate was 89.60%;Heavy rare earth elements showed a certain"integrity"in the experiment.The leaching rate of heavy rare earth elements was higher than that of light rare earth elements.?4?The main change of sulfuric acid concentration in the leaching experiment was that more Eu²⁺was oxidized to Eu3+due to the enhancement of oxidability.The temperature change had a great effect on the solubility of rare earth sulfate products,and then affects the overall leaching rate.The addition of oxidant made the U⁴⁺in uranium mineral be oxidized to U⁶⁺,so that it could be leached from ore,and some rare earth elements similar to uranium elements were leached together.?5?The kinetic analysis of the leaching process shows that the leaching process was mainly controlled by chemical reaction,and the dynamic equation of the leaching process about temperature and sulfuric acid concentration was obtained.