Acid leaching of black shale for the extraction of vanadium

Li, Minting; Wei, Chang; Fan, Gang; Wu, Huilin; Li, Cunxiong; Li, Xingbin

doi:10.1016/j.minpro.2010.04.002

Cited by 54 publications

(17 citation statements)

References 16 publications

(16 reference statements)

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“…In the present study, the starting solution was generated by the same conditions as our previous studies, using a liquid/solid ratio of 4 mL/g, a sulfuric acid concentration of 87.5 g/L, a hydrofluoric acid concentration of 15 g/L, a sodium hypochlorite concentration of 1 g/L, a temperature of 95˝C, and a reaction time of 6 h [24]. The composition of the leach solution generated from black shale from Hunan Province, China, is listed in Table 1. D2EHPA (di(2-ethylhexyl)phosphoric acid) and TBP (tri-n-butylphosphate), supplied by Shanghai Rare-Earth Chemical Co., Ltd., Shanghai, China, were used without further purification.…”

Section: Materials and Reagentsmentioning

confidence: 99%

Recovery of Vanadium from H2SO4-HF Acidic Leaching Solution of Black Shale by Solvent Extraction and Precipitation

Wei

Deng

et al. 2016

Metals

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Abstract:The recovery of vanadium from sulfuric and hydrofluoric mixed acid solutions generated by the direct leaching of black shale was investigated using solvent extraction and precipitation methods. The process consisted of reduction, solvent extraction, and stripping, followed by precipitation and calcination to yield vanadium pentoxide. The influence of various operating parameters on the extraction and recovery of vanadium was studied. Vanadium (IV) was selectively extracted using a mixture of 10% (v/v) di(2-ethylhexyl)phosphoric acid and 5% (v/v) tri-n-butylphosphate in sulfonated kerosene. Using six extraction and five stripping stages, the extraction efficiency for vanadium was 96.7% and the stripping efficiency was 99.7%. V 2 O 5 with a purity of 99.52% was obtained by oxidation of the loaded strip solution and precipitation of ammonium polyvanadate at pH 1.8 to 2.2, followed by calcination of the dried precipitate at 550˝C for 2 h. It was concluded that the combination of solvent extraction and precipitation is an efficient method for the recovery of vanadium from a multi-element leach solution generated from black shale.

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Section: Materials and Reagentsmentioning

confidence: 99%

Recovery of Vanadium from H2SO4-HF Acidic Leaching Solution of Black Shale by Solvent Extraction and Precipitation

Wei

Deng

et al. 2016

Metals

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“…Pyrometallurgical methods are gradually losing competitiveness in the treatment of low-grade stone coal owing to high-energy consumption, environmental pollutants, and additional burdens associated with environmental treatment. Direct acid-leaching technology has become a research hotspot for extracting V from low-grade stone coal because of its simple process, environmental protection, solid experimental research foundation, and industrial application prospects [8,9]. Most V in a low oxidation state in stone coal exists in the crystal lattice of aluminosilicate minerals and isomorphically replaces Al(III) in muscovite.…”

Section: Introductionmentioning

confidence: 99%

“…The transformation and oxidation of V are, therefore, essential for leaching efficiency [10]. Leaching efficiency can be improved by adding oxygen pressure or oxidants [8,11,12]. However, oxygen pressure leaching is not cost-effective for low-grade stone coal and is only applied to stone coal with a grade higher than 1% to generate an industrially recoverable value [6].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Oxidative Leaching for Vanadium Extraction from Low-Grade Stone Coal Using Response Surface Methodology

et al. 2020

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The feasibility and kinetics of vanadium (V) recovery from oxidative leaching of low-grade stone coal using MnO2 were investigated. Oxidative leaching processes (OLPs) were designed using response surface methodology (RSM) based on the central composite design (CCD) model. The results show that the order of factors that influence OLPs is leaching temperature > H2SO4 concentration > leaching time > MnO2 dosage. The interaction between leaching temperature and H2SO4 concentration on the OLP is the most significant. Vanadium leaching efficiency was 89.3% using 31% H2SO4 and 3% MnO2 at 90 °C for 7.9 h. The kinetics of V leaching from stone coal show that the leaching rate is controlled by chemical reaction through a layer according to the shrinking core model and the activation energy is 55.62 kJ/mol. A comparison of the SEM-EDS results of minerals before and after leaching confirms that the muscovite structure was significantly destroyed and V and aluminum (Al) were effectively dissolved during the OLP.

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“…In general, most of the vanadium in shale is scattered in mica minerals as the isomorphism state, and scattered in free oxides and carbonaceous materials as the sorption state [15]. In a number of studies using A. ferrooxidans, the feasibility of bioleaching of different metals from silicate minerals was shown in lab-scale.…”

Section: Introductionmentioning

confidence: 99%

Vanadium Bioleaching Behavior by Acidithiobacillus ferrooxidans from a Vanadium-Bearing Shale

et al. 2018

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This study investigated bioleaching behavior of vanadium from a vanadium-bearing shale using Acidithiobacillus ferrooxidans (A. ferrooxidans). Results showed a maximum recovery of 62% vanadium in 1.2-day bioleaching, which was 22.45% higher than the controls. Then, the vanadium leaching efficiency decreased significantly, only 24% of that was obtained on the tenth day. The vanadium extraction in 1.2 days was mainly attributed to the dissolution of vanadium in free oxides of shale. Fe 3+ produced by A. ferrooxidans promoted the dissolution process. X-ray diffraction (XRD) patterns of the leached residues confirmed the generation of jarosite. SEM-EDS analysis of the residues indicated that jarosite adsorbed on the shale and inhibited the further dissolution of vanadium. The relevance of V, Fe, S, O was quite good in the energy disperse X-ray spectrometry (EDS) element mapping of jarosite, and acid-washing of the jarosite resulted in 31.6% of the vanadium in the precipitates desorption, indicating that the decrease of vanadium leaching efficiency in bioleaching process was caused by both adsorption and co-precipitation with jarosite.

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Acid leaching of black shale for the extraction of vanadium

Cited by 54 publications

References 16 publications

Recovery of Vanadium from H2SO4-HF Acidic Leaching Solution of Black Shale by Solvent Extraction and Precipitation

Recovery of Vanadium from H2SO4-HF Acidic Leaching Solution of Black Shale by Solvent Extraction and Precipitation

Optimization of Oxidative Leaching for Vanadium Extraction from Low-Grade Stone Coal Using Response Surface Methodology

Vanadium Bioleaching Behavior by Acidithiobacillus ferrooxidans from a Vanadium-Bearing Shale

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