Production of high-purity ThO2 from monazite ores for thorium fuel-based reactor
Document Type
Article
Publication Date
6-1-2021
Abstract
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).
Keywords
Thorium fuel, Solvent extraction, D(2)EHPA, Ali quat-336, High-purity ThO2
Divisions
nanocat
Funders
Universiti Kebangsaan Malaysia (UKM) [GUP2018113]
Publication Title
Progress in Nuclear Energy
Volume
136
Publisher
Elsevier
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND