Optimization Recovery of Yttrium Oxide in Precipitation, Extraction, and Stripping Process

12th Joint Conference on Chemistry

Perwira, N.I.^1 ; Basuki, K.T.^1 ; Biyantoro, D.^2 ; Effendy, N.^1

Polytechnic Institute of Nuclear Technology, Batan Yogyakarta, Indonesia^1

Centre for Science and Accelerator Technology-National Nuclear Energy Agency of Indonesia, Yogyakarta, Indonesia^2

关键词: Extraction process;    Impurities in;    Nuclear science and technology;    Optimum conditions;    pH variation;    Precipitation process;    Separation process;    Stripping process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/349/1/012044/pdf
DOI  :  10.1088/1757-899X/349/1/012044

来源: IOP

【 摘 要 】

Yttrium oxide can be used as a dopant control rod of nuclear reactors in YSH material and superconductors. Yttrium oxide is obtained in the Xenotime mineral derived from byproduct of tin mining PT Timah Bangka which contain rare earth elements (REE) dominant Y, Dy, and Gd whose content respectively about 29.53%, 7.76%, and 2.58%. Both usage in the field of nuclear and non-nuclear science and technology is need to pure from the impurities. The presence of impurities in the yttrium oxide may affect the characteristic of the material and the efficiency of its use. Thus it needs to be separated by precipitation and extraction-stripping and calcination in the making of the oxide. However, to obtain higher levels of Yttrium oxide, it is necessary to determine the optimum conditions for its separation. The purpose of this research was to determine the optimum pH of precipitation, determine acid media and concentration optimum in extraction and stripping process and determine the efficiency of the separation of Y from REE concentrate. This research was conducted with pH variation in the precipitation process that pHs were 4 - 8, the difference of acid media for the extraction process, i.e., HNO3, HCl and H2SO4with each concentration of 0,5 M; 1 M; 1,5 M; and 2 M and for stripping process were HNO3, HCl, and H2SO4with each concentration of 1 M; 2M; and 3 M. Based on the result, the optimum pH of precipitation process was 6,5, the optimumacid media was HNO30,5 M, and for stripping process media was HNO33 M. The efficiency of precipitation process at pH 6,5 was 69,53 %, extraction process was 96.39% and stripping process was 4,50%. The separation process from precipitation to extraction had increased the purity and the highest efficiency recovery of Y was in the extraction process and obtained Y2O3purer compared to the feed with the Y2O3content of 92.87%.