Production of high-purity ThO2 from monazite ores for thorium fuel-based reactor

Salehuddin, Ahmad Hayaton Jamely Mohd and Ismail, Aznan Fazli and Aziman, Eli Syafiqah and Mohamed, Nurul Aida and Teridi, Mohd Asri Mat and Idris, Wan Mohd Razi (2021) Production of high-purity ThO2 from monazite ores for thorium fuel-based reactor. Progress in Nuclear Energy, 136. ISSN 0149-1970, DOI

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The present study aims to investigate the optimum parameter in producing high-purity thorium dioxide (ThO2) using Di-2-ethylhexyl phosphoric acid (D(2)EHPA) and Aliquat-336 as solvent materials. The extraction and purification process was performed using l'h-RE](OH)(4) compound which was selectively precipitated from the monazite leach solution. Several parameters such as types of acid (HCl, HNO3 and H-2(SO4)), acid molarity (1M-6M), and solvent ratio (10%-30%) were investigated. The findings indicate that different solvents require a distinctive aqueous medium to extract thorium. The optimum concentrations of D 2 EHPA and Aliquat-336 in extracting thorium were identified to be at 1M H-2(SO4) and 4M HNO3 with 30% and 20% ratio, respectively. The multi-stage extraction process was successfully extracted and purified thorium at a purity of 96.8% (D(2)EHPA) and 98.0% (Aliquat-336). Subsequent conversion to ThO2 yielded a high-purity thorium dioxide at 99.1%. In general, the study elucidates that both solvents have the potential to be utilized as thorium extracting agents in preference to the conventional tri-butyl phosphate (TBP).

Item Type: Article
Funders: Universiti Kebangsaan Malaysia (UKM) [GUP2018113]
Uncontrolled Keywords: Thorium fuel; Solvent extraction; D(2)EHPA; Ali quat-336; High-purity ThO2
Subjects: Q Science > Q Science (General)
T Technology > T Technology (General)
Divisions: Nanotechnology & Catalysis Research Centre
Depositing User: Ms Zaharah Ramly
Date Deposited: 04 Aug 2022 03:36
Last Modified: 04 Aug 2022 03:36

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