Liquid–liquid extraction of tantalum and niobium by octanol from sulfate leach liquor

El-Hazek, M.N.; Amer, T.E.; El-Azm, M.G. Abu; Issa, R. M.; El-Hady, S.M.

doi:10.1016/j.arabjc.2010.07.020

Cited by 24 publications

(6 citation statements)

References 4 publications

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“…Octan-1-ol has been used to quantitatively extract Nb(V) and Ta(V) from sulphate leach liquor (El-Hazek et al, 2012). Some workers have also reported the extraction of Al(III), Ga (III) and In(III) from perchlorate solutions by I-octanol/octane solvent system (Yamada et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Alkanols for the Extraction of Vanadium (V) From Hydrochloric Acid Solutions

Ojo¹,

Oyegoke²

2013

IJC

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Extractive recovery of vanadium (V) from hydrochloric acid solutions using alkanols (1-butanol and 1-octanol) dissolved in n-heptane has been investigated by liquid-liquid extraction, propelled by the need to proffering alternatives to the scarce and relatively costly organophosphorous extractants. At the studied pH range (1.0-4.0), with 1-butanol as extractant, the percentage V(V) extraction (extraction efficiency, E%) reached optimum (E% = 63.3) at pH of 0.5, and for 1-octanol, optimum E% was 73.3 at pH 1.0.Increasing concentration of HCl at the studied range (1.0-6.0 mol L -1 ) was found to have an appreciable effect on percentage V(V) extraction. With both extractants, E% peaked at 6.0 mol L -1 HCl with values 86.7 and 70.0% for 1-butanol and 1-octanol, respectively. With increase in the concentration of extractants, both extractants produced a trend of increase/decrease in E% for V(V), suggesting the extraction of two different species. The optimal percentage extraction values were 76.7 and 96.7% observed at log[1-butanol] = 0.81 mol L -1 and log[1-octanol] = 0.49 mol L -1 , in that order. The determined enthalpy change, ΔH, for 1-butanol and 1-octanol systems were -19.9kJ mol -1 and -37.1 kJ mol -1 , respectively, indicating exothermic extraction processes. On the number of required extraction stages, 1-octanol gave a higher extraction efficiency after three consecutive extractions (E% = 99.3) than 1-butanol (E% = 88.6). Recycling experiment showed 1-octanol as more recyclable than 1-butanol (Recycling coefficient R.C. = 1.0 for 1-octanol while R.C. < 1.0 for 1-butanol). All extractants mixed with 1-butanol were found antagonistic. All added foreign ions decreased E% for V(V). From slope analysis, analytical and spectra data, the extracted complexes have been formulated as VO 2 Cl·nROH and (VO 2 Cl) m ·nROH (where m >> n) at low and high concentrations of extractant, respectively. On the whole, 1-octanol could be adjudged a better extractant for vanadium (V) under the prevailing experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Alkanols for the Extraction of Vanadium (V) From Hydrochloric Acid Solutions

Ojo¹,

Oyegoke²

2013

IJC

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“…The operational temperature of colombo-tantalite leaching in HF-H 2 SO 4 media is usually kept around 100 °C (Htwe and Lwin, 2008;El-Hazek et al, 2012). When parameters such as particle size, HF/H 2 SO 4 ratio, digestion time and stirring rate are maintained close to their optimal values, high dissolution degrees could be obtained.…”

Section: Leaching Based On Combination Of Hydrofluoric and Sulfuric A...mentioning

confidence: 99%

“…Octanol is the commonly used alcohol-based extractant. It is characterized by low solubility in water (0.1 mL/100 mL) and high flash point (81 °C) (El-Hazek et al, 2012). Two octanol-based extractants are commercialized for Ta and Nb extraction.…”

Section: Raw Materialsmentioning

confidence: 99%

“…There were few studies that report on separation of Ta and Nb using octanol (C 18 H 18 O) diluted in kerosene (Mayorov and Nikolaev, 2002;Agulyansky et al, 2004;El-Hazek et al, 2012;Kabangu and Crouse, 2012). The extraction process consists of collective extraction of Ta and Nb and their subsequent selective striping from the loaded octanol.…”

Section: Raw Materialsmentioning

confidence: 99%

“…Both are insoluble in water, making them ideal for solvent extraction purposes (Ungerer, 2012). Although, Alamine 336 and Aliquat 336 have high flash points, 179 °C and 132 °C respectively, their main disadvantage lies in their tendency to generate a third phase and form emulsion (Ungerer, 2012;El-Hazek et al, 2012). The addition of a modifier, for example a 1-octanol, has been suggested to prevent these drawbacks (El-Hazek et al, 2012).…”

Section: Amine-based Extractantsmentioning

confidence: 99%

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