Alkaline leaching of lead and zinc by sodium hydroxide: kinetics modeling

Ghasemi, Seyed Mahyar Seyed; Azizi, Asghar

doi:10.1016/j.jmrt.2017.03.005

Cited by 80 publications

(41 citation statements)

References 19 publications

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“…This small values indicates that the leaching rate is controlled by diffusion process [29,30,34]. Also, the effects of stirring rate and temperature confirm that the dissolution reaction is controlled by a diffusion process.…”

Section: [Figure 6]mentioning

confidence: 80%

“…A 5 mL samples were accurately withdrawn at regular intervals during the reaction and were immediately filtered. Then the solution was analyzed using a unicam atomic absorption spectrometry (AAS) [28,29]. The amounts of copper leached was calculated via the following equation:…”

Section: Leaching Experimentsmentioning

confidence: 99%

“…In heterogeneous reaction systems, most reactions follow a shrinking core model (SCM) which approximates the dissolution of real particles [31]. According to this model, it can be concluded that the leaching process in H 2 SO 4 solution involves: (i) transport of H 2 SO 4 from the bulk solution to the particle surface, (ii) diffusion of H 2 SO 4 through the solid residual layer from the particle surface to the surface of unreacted core, (iii) reaction between H 2 SO 4 and oxide ore on the surface of the unreacted core, (iv) diffusion of the resultants through the solid residual layer from the reaction interface to the particle surface, and (v) transport of the resultants from the particle surface to the bulk solution [28,29,32]. Generally, this model expressed by below described equations [11,19,31].…”

Section: Identification Of the Leaching Mechanismmentioning

confidence: 99%

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A comprehensive study of the leaching behavior and dissolution kinetics of copper oxide ore in sulfuric acid lixiviant

2018

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The leaching behavior of an Iranian copper oxide ore in sulphuric acid was investigated in detail to evaluate the influence of various factors, to optimize the dissolution conditions and to determine the kinetics of the leaching. The results indicated that the increase in the leaching time and temperature enhanced the leaching rate of copper. The leaching rate increased up to a certain value with increasing the agitation rate, acid concentration and liquid/solid ratio and with further increment reduced. Agitaion rate had the most influence on the dissolution of copper. The 3D response surface graphs confirmed the interactive effects of sulphuric acid concentration, agitation speed, and liquid/solid ratio with temperature. About 91% copper content was leached at~13% sulphuric acid concentration, stirring rate of 600 rpm, liquid/solid ratio of 10 mL/g and 50 °C after 80 min leaching. The dissolution kinetics was examined according to heterogeneous models. The shrinking core model assuming rate control by diffusion through the product layer was found appropriate to describe the dissolution of copper in sulphuric acid solution. The activation energy was obtained to be 26.699 kJ/mol and equation representing the leaching kinetics of copper based on diffusioncontrolled model was found to be 1-3(1-x) 2/3 +2(1-x) = 161.97×exp(-26.699×10 3 /8.314×T)×t.

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Section: [Figure 6]mentioning

confidence: 80%

Section: Leaching Experimentsmentioning

confidence: 99%

Section: Identification Of the Leaching Mechanismmentioning

confidence: 99%

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A comprehensive study of the leaching behavior and dissolution kinetics of copper oxide ore in sulfuric acid lixiviant

2018

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“…Both processes have advantages and disadvantages [4,[6][7][8]. In the hydrometallurgical treatment of black dross, either acidic or alkaline solutions are employed to selectively dissolve components from black dross [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Since some oxides in black dross are dissolved together with alumina, HCl leaching should not be used to recover pure alumina [12]. Although the leaching percentage of alumina via NaOH solutions is not as high as that via HCl solutions, an alkaline leaching solution has some selectivity for alumina because the oxides of Ca, Fe, and Mg will not dissolve in this medium [8]. Furthermore, pure aluminum hydroxide can be recovered from an alkaline leaching solution of black dross via crystallization or precipitation, which is considered economical and environmentally friendly [5,13].…”

Section: Introductionmentioning

confidence: 99%

Ball Milling Treatment of Black Dross for Selective Dissolution of Alumina in Sodium Hydroxide Leaching

Lee

Nguyen

2018

Processes

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Abstract:A process consisting of ball milling followed by NaOH leaching was developed to selectively dissolve alumina from black dross. From the ball milling treatment, it was found that milling speed greatly affected the leaching behavior of silica and the oxides of Ca, Fe, Mg, and Ti present in dross. The leaching behavior of the mechanically activated dross was investigated by varying NaOH concentration, leaching temperature and time, and pulp density. In most of the leaching conditions, only alumina and silica were dissolved, while the leaching percentage of other oxides was negligible. The leaching percentage of silica decreased rapidly to nearly zero as pulp density increased to 100 g/L. At the optimum leaching conditions (5 M NaOH, 50 • C, 2 h, pulp density of 100 g/L), the purity of Al in the leaching solution was higher than 98%, but the leaching percentage of alumina was only 35%.

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Kinetics and Mechanism of Leaching Potassium from Biotite in H₂SO₄ Solution

Yuan

2020

ChemistrySelect

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Biotite is a potential potassium mineral resource and the dissolution of biotite in H 2 SO 4 solution is a green chemistry approach for recovering potassium. To estimate the efficiency of leaching process and to understand the behavior of leaching reactors, the kinetics and mechanism of leaching potassium from biotite in H 2 SO 4 solution were studied in this work. The leaching experiments show that leached fractions of K 2 O increase with the increasing of temperatures and H 2 SO 4 concentrations, and yet with the decreasing of biotite particle sizes. According to the shrinking core model, the leached fractions of K 2 O were fitted better by diffusion through product layer. A kinetics expression of diffusion-controlled model on three parameters was acquired and it is appropriate to predict the leached fractions of K 2 O from biotite in H 2 SO 4 solution. The dissolution of biotite in H 2 SO 4 solution was interpreted by electrochemical mechanism coupling with characterization of the acid-leached residues. This research results can aid in the design of leaching process for recovering potassium sustainably from biotite.

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Alkaline leaching of lead and zinc by sodium hydroxide: kinetics modeling

Cited by 80 publications

References 19 publications

A comprehensive study of the leaching behavior and dissolution kinetics of copper oxide ore in sulfuric acid lixiviant

A comprehensive study of the leaching behavior and dissolution kinetics of copper oxide ore in sulfuric acid lixiviant

Ball Milling Treatment of Black Dross for Selective Dissolution of Alumina in Sodium Hydroxide Leaching

Kinetics and Mechanism of Leaching Potassium from Biotite in H₂SO₄ Solution

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Alkaline leaching of lead and zinc by sodium hydroxide: kinetics modeling

Cited by 80 publications

References 19 publications

A comprehensive study of the leaching behavior and dissolution kinetics of copper oxide ore in sulfuric acid lixiviant

A comprehensive study of the leaching behavior and dissolution kinetics of copper oxide ore in sulfuric acid lixiviant

Ball Milling Treatment of Black Dross for Selective Dissolution of Alumina in Sodium Hydroxide Leaching

Kinetics and Mechanism of Leaching Potassium from Biotite in H2SO4 Solution

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Kinetics and Mechanism of Leaching Potassium from Biotite in H₂SO₄ Solution