Extraction Of Eu And Y From Sichuan Maoniuping Rare-Earth Ore And Utilization

Following the Separation-Preparation Integration, this thesis works on the extraction and high performance utilization from Maoniuping rare-earth ore. Cyanex 301 was selected as extractant to extract rare-earth elements Eu(III) and Y(III) and other metal elements Ag, Cd and Zn in hydrochloric acid system. Some nanosized powders have been prepared with the load organic phase.1. Geochemical characteristics of Maoniuping rare-earth deposit were analyzed. 2. Extraction of Eu(III) and Y(III) of the ore using Cyanex 301 was investigated for the first time. The effect of acidity and metal concentration was discussed. In the case, the optimum percentage extraction value of 96.43% was achieved at equilibrium pH 2.5 for Eu(III) and that of 74.3% at equilibrium pH 2.6 for Y(III), respectively, with extractant and metal concentration ratio of 20:1. The extraction mechanism is proposed based on slope analysis.3. Some nanosized powders have been prepared with the load organic phase by thermal decomposition process, solvothermal synthesis, gas-liqiud synthetic approach and so on. The sizes of CdS nanocrystals synthesized via thermal decomposition are tunable by varying the reaction temperature and time. The extractant Cyanex 301 plays several functions in the whole procedure: to be as the extractant for metal ions, the sulfur source for producing metal sulfides and the surfactant for the nanocrystals.4. Comparison with traditional process, this method this method shortens the techniques process, avoids the amount of acid contamination and achieves the high performance utilization.