New liquid-liquid extraction column with random packed agitation structure for heavy metal removal and hydrodynamic evaluation

Asadollahzadeh, Mehdi; Torkaman, Rezvan; Torab‐Mostaedi, Meisam

doi:10.1016/j.mineng.2022.107812

Cited by 17 publications

(2 citation statements)

References 45 publications

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“…Cobalt and copper play a crucial role in numerous industrial sectors, including infrastructure, transportation, electronic devices, super-alloys, and catalysts used in chemical processing 1 – 4 . In recent years, there have been numerous difficulties encountered by the supply chain responsible for these materials 5 – 7 . These two elements are often found together in minerals and industrial products 8 .…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic features of pulsed solvent extractor for separation of two metals by using the antagonistic effect of solvents

Asadollahzadeh,

Torkaman

2024

Sci Rep

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Separating copper and cobalt ions is crucial due to the industry’s strategic reliance on both these elements. When the extraction process is able to significantly increase the separation factor, it becomes favorable to separate two ions. However, the presence of Cu(II) ions together with Co(II) hinders the achievement of optimum efficiency when using commonly available extractants. This study conducted the separation of the two elements using both batch and continuous methods in a pilot plant pulsed column equipped with a disc and doughnut structure. The initial step involved optimizing the key variables to maximize the separation factor using the central composite design procedure. The optimization of Cyanex272, Cyphos IL 101 concentrations, and the pH value of the aqueous phase were all adjusted to 0.024 M, 0.046 M, and 7.3, correspondingly. In the following step, the hydrodynamic characteristics and extraction performance were examined in the pulsed column of the pilot plant. The findings indicated that the presence of Cyphos IL 101 resulted in an increased separation factor and efficiency within the column. As a result, the ionic liquid enhances performance without encountering any operational issues. This additive is considered an environmentally friendly solvent and does not cause any negative impacts. Consequently, it is suggested for utilization in continuous industrial processes.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic features of pulsed solvent extractor for separation of two metals by using the antagonistic effect of solvents

Asadollahzadeh,

Torkaman

2024

Sci Rep

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“…A multi-impeller agitated column, a typical extraction process equipment, achieves a high extraction efficiency using an increased agitation speed 1 , 2 . Numerous liquid droplets were created, exhibiting excellent micro-mixing, and mass transfer performance 3 , 4 .…”

Section: Introductionmentioning

confidence: 99%

Establishing forward mixing model to mass transfer overview in multi-impeller agitated column for rare Earth extraction process

Torkaman,

Rovais,

Asadollahzadeh

et al. 2024

Sci Rep

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The current study develops comprehensive mass transfer models to optimize the rare earth extraction. A plug flow, axial dispersion, backflow, forward mixing-based mass transfer model was created and solved numerically using the fitting technique. The investigated process is a multi-impeller agitated column designed to provide proper contact between organic and aqueous phases to extract rare-earth ions. Taking Sm(III)–Gd(III) separation as an application case, extraction efficiency in the agitation speed of 200 rpm was obtained equal to 95.14%, 76.67% by this column for Gd(III), and Sm(III) ions, respectively. The model's findings were compared with experimental data, and a significant agreement was achieved with the forward mixing model. The results indicated that the high agitation speed is beneficial to increasing the interfacial area while reducing the mass-transfer coefficient. On the contrary, the circulation within the larger droplet improves the transfer of mass, albeit at the expense of reducing the interfacial area. The results showed that the drop size distribution is a crucial factor as the droplet sizes significantly affect the droplet mass transfer. The mathematical models’ values of Ec for mass transfer parameters showed that the operational variables significantly affect the mass transfer rate and can cause deviations from the ideal flow path. A reasonable and appropriate estimation of the organic-side volumetric overall mass transfer coefficient was provided, which can be applied to this contactor’s design and scale-up.

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Removal of Co(II) and various metal ions from the residue of the zinc plant through solvent extraction using both acid and neutral extractants

Maleki,

Torkaman,

Asadollahzadeh

2024

Can J Chem Eng

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The recovery of cobalt from secondary sources is a crucial issue in technology development, particularly for its numerous applications in various industries. Solvent extraction has proven an effective method for metallic ions separation from secondary sources. The main goal of this work was to study the separation of metals by solvent extraction technique from zinc plant leach waste. Initially, several extractants, including Cyanex 272, Cyanex 301, LIX 5640 H, Alamine 336, and tri‐n‐octylamine (TOA), were tested to treat the leach solution. It was discovered that the saponified extractant di‐(2‐ethylhexyl) phosphoric acid (D2EHPA) (10%) + tri‐n‐butyl phosphate (TBP) (10%) effectively eliminated interfering elements such as manganese, zinc, and iron, with extraction efficiencies of 95%, 98%, and 99.9%, respectively. To increase the concentration of cobalt in the purified solution, the cobalt recovery step was performed using various acids on the loaded organic phase. The best outcome was achieved using ammonium sulphate salt (1 M), which recovered about 50% of the cobalt present in the organic phase. The recovered cobalt was then subjected to the electrowinning process to produce cobalt metal of high purity. A cathodic current density of 100 A/m2 was determined to be the optimal current for the electrolyte solution. Lastly, scanning electron microscope (SEM) and X‐ray fluorescence (XRF) analyses were carried out to examine the structure and purity of the resulting metallic cobalt, which was found to have a purity of 99.5%.

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New liquid-liquid extraction column with random packed agitation structure for heavy metal removal and hydrodynamic evaluation

Cited by 17 publications

References 45 publications

Hydrodynamic features of pulsed solvent extractor for separation of two metals by using the antagonistic effect of solvents

Hydrodynamic features of pulsed solvent extractor for separation of two metals by using the antagonistic effect of solvents

Establishing forward mixing model to mass transfer overview in multi-impeller agitated column for rare Earth extraction process

Removal of Co(II) and various metal ions from the residue of the zinc plant through solvent extraction using both acid and neutral extractants

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