Behaviour of Si, Al, Fe and Mg during oxidative sulfuric acid leaching of low grade uranium ore: A kinetic approach

Madakkaruppan, V.; Pius, Anitha; Sreenivas, T.; Sunilkumar, T. S.

doi:10.1016/j.jece.2019.103139

Cited by 16 publications

(3 citation statements)

References 10 publications

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“…Heap leaching technique produce a huge amounts of pregnant leach solution which get difficulty to pretreatment before loading, so that require low H 2 SO 4 concentrate to keep the resulting leacheat pH not exceed 1.5. In addition to decrease the solubility of other associated elements [22].…”

Section: Resultsmentioning

confidence: 99%

Capability of Uranium Heap Leaching From Gattar and El Missikat Area, Eastern Desert, Egypt: A Kinetic Approach

S¹

2020

J Eng App Sci Technol

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Detailed studies of uranium heap leaching from different uranium mineralization resources situated in Eastern Desert of Egypt were investigated using sulfuric acid via batch experiments, followed by using the obtained optimum condition on bench scale leaching tests using small column. The previous optimum parameters were implemented on another large scale column in order to make more condition control and evaluate the time and reagents needed while transferring from small to large scale. The obtained data shows that leaching efficiency of GII mineralization attained about 78.3% with consumed acid amount about 34 kg/ton in a 44 days as leaching time, on the other hand, leaching efficiency of uranium from El-Missikat mineralization higher than GII mineralization and attained about 86.6% and the consumed as lower than G-II about 28kg/ton in a 40 days leaching time. Kinetics reaction models of column tests have been investigated to optimize the column leaching behavior. Based on the leaching results of the two mineralized occurrences, the rate of the uranium dissolution is controlled by both the chemical reaction and the diffusion reaction but diffusion reaction control was more predominate than a chemical reaction.

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Section: Resultsmentioning

confidence: 99%

Capability of Uranium Heap Leaching From Gattar and El Missikat Area, Eastern Desert, Egypt: A Kinetic Approach

S¹

2020

J Eng App Sci Technol

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“…Stronger hydrodynamic conditions correspond to a lower distribution coe cient. In the batch adsorption experiments, the shaking of the shaker leads to su cient sandstone grains suspended in the liquid phase, which reduces the thickness of the boundary layer on the solid surface and promotes the diffusion of U to the solid surface (Madakkaruppan et al 2019). Therefore, it can be assumed that the sandstone grains and the uranium solutions remain in equilibrium throughout the experiments.…”

Section: Comparison Of U Distribution Coe Cientmentioning

confidence: 99%

Characteristics and influencing factors of uranium adsorption by sandstones outside an acid in situ leaching uranium mining area

Yang,

Cui,

Meng

et al. 2023

Environ Earth Sci

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Uranium (U) contamination in groundwater of the uranium mines exploited using the in-situ leaching (ISL) technology (also referred to as the ISL uranium mines) has attracted wide international attention. Since the adsorption of U in groundwater by aquifer media in uences the migration scope of U, understanding the U adsorption by aquifer media is of great signi cance for accurately predicting the in uencing scope of ISL uranium mines on groundwater. This study collected sandstone samples from the ore-bearing aquifer outside a typical mining area in a uranium mine exploited using the acid ISL (AISL) technology (also referred to as an AISL uranium mine) in northern China. Using these sandstone samples, this study conducted batch adsorption experiments and column experiments of U to reveal the characteristics and major in uencing factors of U adsorption under different conditions. The results show that the adsorption of U by sandstones in the ore-bearing aquifer outside a mining area satis es the pseudo-second-order kinetic equation and the linear isothermal adsorption model. In the batch U adsorption experiments, the adsorption e ciency and capacity for U reached maxima of 77.45% and 0.069 mg/g at pH 7, respectively. As shown by column experiments, the sandstones showed a signi cant increase in the U adsorption and retardation as pH increased. The SO 4 2− concentration has minor effects on U adsorption under experimental conditions. Sandstones from different monitoring wells exhibited different U adsorption characteristics. Sandstone cores with relatively high contents of clay minerals such as illite showed strong U adsorption. Under the same experimental conditions, the U distribution coe cient K d (6.91×10 − 2 L/g) obtained from column experiments is much less than that (0.14 L/g) obtained from the batch U adsorption experiments. These results suggest that it is necessary to take into account the U adsorption and retardation by aquifer media in predicting the impacts of ISL uranium mines on the groundwater environment.

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“…(20) Heap leaching technique produce a huge amounts of pregnant leach solution which get difficulty to pretreatment before loading, so that require low H2SO4 concentrate to keep the resulting leacheat pH not exceed 1.5. In addition to decrease the solubility of other associated elements (22) .…”

Section: Chemical Composition Of Gii and El-missikat Uranium Occurrencementioning

confidence: 99%

Capability of Uranium Heap Leaching from Gattar and El Missikat area, Eastern Desert, Egypt: A kinetic Approach

2020

Int J Org Inorg Chem

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Detailed studies of uranium heap leaching from different uranium mineralization resources situated in Eastern Desert of Egypt were investigated using sulfuric acid via batch experiments, bench scale leaching tests using small column also investigated after obtained optimum conditions. The obtained data shows that leaching of GII mineralization attained about 78.3% using 34 kg/ton at 44 days leaching time, on the other hand, leaching efficiency of uranium from El-Missikat mineralization was about 86.6% which is higher than GII mineralization using 28kg/ton at a 40 days leaching time. Kinetics reaction models of column tests have been investigated to improved understanding of the chemical reaction mechanism that is involved in the dissolution of this refractory mineral that influence the leaching process Based on the leaching results of the two mineralized occurrences, the rate of the uranium dissolution is controlled by both the chemical reaction and the diffusion reaction but diffusion reaction control was more predominate than a chemical reaction.

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Behaviour of Si, Al, Fe and Mg during oxidative sulfuric acid leaching of low grade uranium ore: A kinetic approach

Cited by 16 publications

References 10 publications

Capability of Uranium Heap Leaching From Gattar and El Missikat Area, Eastern Desert, Egypt: A Kinetic Approach

Capability of Uranium Heap Leaching From Gattar and El Missikat Area, Eastern Desert, Egypt: A Kinetic Approach

Characteristics and influencing factors of uranium adsorption by sandstones outside an acid in situ leaching uranium mining area

Capability of Uranium Heap Leaching from Gattar and El Missikat area, Eastern Desert, Egypt: A kinetic Approach

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