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

doi:10.1007/s11705-013-1317-6

Front Chem Sci Eng

2013, Vol. 7

Issue (1) : 95-102 https://doi.org/10.1007/s11705-013-1317-6

RESEARCH ARTICLE

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

T. A. Lasheen¹(

), M. E. El-Ahmady¹, H. B. Hassib², A. S. Helal¹

1. Nuclear Materials Authority, Cairo, Egypt; 2. Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt

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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; H₂O₂ 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 H₂O₂ 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 H₂O₂ it was 1.2544.

Keywords leaching of molybdenum leaching of uranium kinetics

Corresponding Author(s): Lasheen T. A.,Email:lasheen_ta@yahoo.com

Issue Date: 05 March 2013

Cite this article:

T. A. Lasheen,M. E. El-Ahmady,H. B. Hassib, et al. Oxidative leaching kinetics of molybdenum-uranium ore in H₂SO₄ using H₂O₂ as an oxidizing agent[J]. Front Chem Sci Eng, 2013, 7(1): 95-102.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1317-6
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I1/95

Fig.1 XRD spectrum of the working ore

Tab.1 Chemical composition of the molybdenum-uranium ore

Tab.2 Assay of uranium and molybdenum in the working ore

Fig.2 Effect of HSO concentration on the leaching efficiencies of uranium and molybdenum at 0.5 M HO, 95°C, 1 : 14 solid/liquid ratio, 2 h and 74 μm

Fig.3 Effect of the HO concentration on the leaching efficiencies of uranium and molybdenum at 2.5 M HSO, 95°C, 1 ∶ 14 solid/liquid ratio, 2 h and 74 μm

Fig.4 Effect of temperature upon the leaching efficiencies of uranium and molybdenum at 2.5 M HSO, 0.5 M HO, 1 ∶ 14 solid/liquid ratio, 2 h and 74 μm

Fig.5 Effect of solid/liquid ratio upon the leaching efficiencies of uranium and molybdenum at 2.5 M HSO, 0.5 M HO, 95°C, 2 h and 74 μm

Fig.6 Effect of temperature on the leaching rate of molybdenum at 2.5 M HSO, 0.5 M HO and 74 μm

Fig.7 Relationship between [1 – (1–)] and leaching time for molybdenum leaching at various temperatures at 2.5 M HSO, 0.5 M HO and 74 μm

Fig.8 Arrhenius plot for molybdenum leaching at 2.5 M HSO, 0.5 M HO and 74 μm

Fig.9 Effect of HSO concentration on the leaching rate of molybdenum at 0.5 M HO, 95°C and 74 μm

Fig.10 Relationship between [1 – (1 – )] and the leaching time for molybdenum leaching at various HSO concentrations at 0.5 M HO, 95°C and 74 μm

Fig.11 log-log plot of the rate constant versus total HSO concentration at 0.5 M HO, 95°C and 74 μm

Fig.12 Effect of the HO concentration on the leaching rate of molybdenum at 2.5 M HSO, 95°C and 74 μm

Fig.13 Relationship between [1 – (1 – )] and the leaching time for molybdenum leaching at various HO concentrations at 2.5 M HSO, 95°C and 74 μm

Fig.14 log-log plot of the rate constant versus total HO concentration at 2.5 M HSO, 95°C and 74 μm

Fig.15 Effect of particle size on the leaching rate of molybdenum at 2.5 M HSO, 0.5 M HO and 95°C

Fig.16 Relationship between [1 – (1 – )] and the leaching time for molybdenum leaching with different particle sizes at 2.5 M HSO, 0.5 M HO and 95°C

Fig.17 Plot of the rate constant versus the inverse of the particle diameter at 2.5 M HSO, 0.5 M HO and 95°C

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