학술논문
Extraction of uranium(VI) from mineral acid solutions by di-4-octylphenylphosphoric acid (DOPPA)
Document Type
Journal Article
Author
Source
Sep. Sci. Technol.; (United States); 13:7
Subject
Language
English
Abstract
The extraction of uranium(VI) from sulfuric, hydrochloric, nitric, and perchloric acid was studied using dioctylphenylphosphoric acid (DOPPA) in heptane as extractant. At low aqueous acid concentration, an ion-exchange mechanism was generally observed and the extracted species was of the type UO/sub 2/A/sub 4/H/sub 2/. Deviation from this behavior was oserved at higher acid concentrations. From perchloric acid solutions, after an initial decrease, the extraction coefficient increased after 3 to 4 N acid. Some of the explanations offered in the literature for this behavior in the case of di-2-ethylhexylphosphoric acid (DEHPA) have been critically examined. Extraction of mineral acids, particularly HCl and HNO/sub 3/, was also observed with DOPPA but to a lesser extent than with DEHPA.