Application of a topochemical reaction model to predict leaching behavior of high carbonate uranium ores in alkaline solutions: An experimental case study

Kacham, Anand Rao; Suri, A.K.

doi:10.1016/j.hydromet.2013.10.005

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…Evidence presented by [23] showed that leaching models that do not take variation of particle size into consideration are susceptible to flawed conclusions. Efforts to address the particle size challenge are shown in [19] and [7]. They employed mathematical techniques of regression analysis and Gates Gaudin Schumann density function.…”

Section: Discussionmentioning

confidence: 99%

“…Reference [5] adopted the shrinking core model to develop a mathematical model for zinc ore leaching. Recent applications of the shrinking core model are reported by [6] and [7] who investigated the effects of particle size distribution in leaching reactors and in predicting the leaching behaviour of high carbonate uranium ores. A lumped pseudo homogenous kinetic model was applied by [8] to fit gold concentration as a function of time using least square method.…”

Section: Introductionmentioning

confidence: 99%

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Predictive Models of Leaching Processes: A Critical Review

2015

7th International Conference on Latest Trends in Engineering and Technology (ICLTET'2015) Nov. 26-27, 2015 Irene, Pretoria (Sou

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This paper critically reviews models employed in various leaching processes. The aim of this work is to study various leaching models for the development of a model that can predict both recovery and reagent consumption using available mineralogical data. The envisaged model will be used as a tool for predicting hydrometallurgical routes from mineralogical data. The development of a hydrometallurgical process is a vital step in designing a mineral processing plant. Modelling can provide reliable data for preliminary feasibility studies and this simplifies the decision making process. Under the current economic climate which is characterized by falling metal prizes, reduction of production costs and improving efficiency may increase the profitability of mineral processing businesses. The development and success of the proposed model will add value to the copper extraction and beneficiation value chain.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predictive Models of Leaching Processes: A Critical Review

2015

7th International Conference on Latest Trends in Engineering and Technology (ICLTET'2015) Nov. 26-27, 2015 Irene, Pretoria (Sou

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“…A number of leaching tests have been reported to study the U leaching mechanism from porous media under different leaching conditions [22][23][24][25][26][27]. The impact of parameters including pH, Eh, and alkalinity on U recovery parameter was investigated.…”

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics and Uranium Neutral Leaching through a CO2 + O2 System—An Example from Uranium Ore of the ELZPA Ore Deposit in Pakistan

Asghar

Sun

Chen

et al. 2020

Metals

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Geochemical characterization studies and batch leaching experiments were conducted to explore the effects of a CO2 + O2 leaching system on uranium (U) recovery from ores obtained from an eastern limb of Zinda Pir Anticline ore deposit in Pakistan. The mineralogy of the ore was identified by Electron Probe Micro-analyzer (EPMA) and Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM-EDS), showing that pitchblende is the main ore mineral. XRD was also used along with EPMA and SEM characterization data. Experimental results indicate that U mobility was readily facilitated in the CO2 + O2 system with Eh 284 mV and pH 6.24, and an 86% recovery rate of U3O8 was obtained. U speciation analysis implied the formation of UO2 (CO3)22− in the pregnant solution. The plausible mechanism may be attributed to the dissolved CO2 gas that forms carbonate/bicarbonate ion releasing oxidized U from the ore mineral. However, U recovery in the liquid phase was shown to decrease by higher U(VI) initial concentration, which may be due to the saturation of Fe adsorption capacity, as suggested by an increase in Fe concentration with increasing initial U(VI) concentration in the solid phase. However, further studies are needed to reveal the influencing mechanism of U(VI) initial concentration on U recovery in the solid phase. This study provides new insights on the feasibility and validity of the site application of U neutral in situ leaching.

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