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Author Lasheen, T. A. ♦ El Ahmady, M. E. ♦ Hassib, H. B. ♦ Helal, A. S.
Source SpringerLink
Content type Text
Publisher SP Higher Education Press
File Format PDF
Copyright Year ©2013
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences
Subject Keyword leaching of molybdenum ♦ leaching of uranium ♦ kinetics ♦ Industrial Chemistry/Chemical Engineering ♦ Nanotechnology
Abstract The processing of molybdenum-uranium ore in a sulfuric acid solution using hydrogen peroxide as an oxidant has been investigated. The leaching temperature, hydrogen peroxide concentration, sulfuric acid concentration, leaching time, particle size, liquid-to-solid ratio and agitation speed all have significant effects on the process. The optimum process operating parameters were: temperature: 95°C; H$_{2}$O$_{2}$ concentration: 0.5 M; sulfuric acid concentration: 2.5 M; time: 2 h; particle size: 74 μm, liquid-to-solid ratio: 14:1 and agitation speed: 600 rpm. Under these experimental conditions, the extraction efficiency of molybdenum was about 98.4%, and the uranium extraction efficiency was about 98.7%.The leaching kinetics of molybdenum showed that the reaction rate of the leaching process is controlled by the chemical reaction at the particle surface. The leaching process follows the kinetic model 1 − (1−X)$^{1/3}$ = kt with an apparent activation energy of 40.40 kJ/mole. The temperature, concentrations of H$_{2}$O$_{2}$ and H$_{2}$SO$_{4}$ and the mesh size are the main factors that influence the leaching rate. The reaction order in H$_{2}$SO$_{4}$ was 1.0012 and in H$_{2}$O$_{2}$ it was 1.2544.
ISSN 20950179
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2013-01-28
Publisher Institution Chinese Universities
Publisher Place Heidelberg
e-ISSN 20950187
Journal Frontiers of Chemical Engineering in China
Volume Number 7
Issue Number 1
Page Count 8
Starting Page 95
Ending Page 102

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Source: SpringerLink