Oxidative leaching kinetics of molybdenum-uranium ore in H2SO4 using H2O2 as an oxidizing agent

作     者：T. A. Lasheen M. E. EI-Ahmady H. B. Hassib A. S. Helal 

作者机构：Nuclear Materials Authority Cairo Egypt Chemistry Department Faculty of Science Cairo University Giza Egypt 

出 版 物：《Frontiers of Chemical Science and Engineering》 (化学科学与工程前沿（英文版）)

年 卷 期：2013年第7卷第1期

页      面：95-102页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

主　　题：leaching of molybdenum leaching of uranium kinetics 

摘      要：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℃; H2O2 concentration： 0.5 M; sulfuric acid concentration： 2.5 M; time： 2 h; particle size： 74 gm, 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 H202 and H2SO4 and the mesh size are the main factors that influence the leaching rate. The reaction order in H2SO4 was 1.0012 and in H202 it was 1.2544.