Electrochemical decomposition of vanadium slag in concentrated NaOH solution

Wang, Zhonghang; Zheng, Shili; Wang, Shaona; Qin, Ya-Ling; Du, Hao; Zhang, Yi

doi:10.1016/j.hydromet.2014.10.017

Cited by 82 publications

(28 citation statements)

References 11 publications

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“…Oxidizing substances like MnO 2 and KClO 3 were added to enhancing the leaching of vanadium in low valence during the leaching process 14,15 . Electricity as an environmental-friendly resource was also introduced to intensify the leaching process 5,16,17 . This paper presented a method that utilized H 2 O 2 as an oxidant to oxidize vanadium and chromium in low valent in concentrated NaOH solution during the leaching process.…”

Section: Introductionmentioning

confidence: 99%

A green method to leach vanadium and chromium from residue using NaOH-H2O2

Peng

Liu

Tao

2018

Sci Rep

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Hydrogen peroxide as an oxidant was applied in leaching of vanadium and chromium in concentrated NaOH solution. Under the optimal reaction conditions (the liquid to solid ratio of 4.0 ml/g, residue particle size of <200 mesh, the mass ratio of NaOH-to-residue of 1.0 g/g, the volume ratio of H2O2-to-residue of 1.2 ml/g, reaction temperature of 90 °C and reaction time of 120 min), the leaching efficiency of vanadium and chromium could reach up to 98.60% and 86.49%, respectively. Compared with the current liquid-phase oxidation technologies, the reaction temperature was 90–310 °C lower, and the NaOH concentration of the reaction medium is lower by more than 50 wt% (the mass ratio of NaOH-to-residue of 1.0 g/g equals to concentration of 20 wt%). The kinetics study revealed that leaching process of chromium and vanadium were interpreted with shrinking core model under chemical reaction control. The apparent activation energy of chromium and vanadium dissolution was 22.19 kJ/mol and 6.95 kJ/mol, respectively.

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Section: Introductionmentioning

confidence: 99%

A green method to leach vanadium and chromium from residue using NaOH-H2O2

Peng

Liu

Tao

2018

Sci Rep

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“…However, it seriously pollutes the environment, and has difficulties in comprehensive utilization of the leaching residue and in the recycling of wastewater, which contains high concentration of sodium. Consequently, some novel processes for cleaner vanadium extraction have been proposed, like roasting without adding salt [4], submolten salt extraction [5][6][7], alkali decomposition enhanced by electrochemistry [8], direct acid leaching [9][10][11], sulfating roasting [12] and calcified roasting followed by dilute acid leaching [13,14]. Vanadium extraction with calcium salt roasting is increasingly concerned these years due to its lower cost of roasting additive, no emission of pollutional gas, like HCl, Cl 2 , SO 2 and SO 3 , and no sodium contained in subsequent leaching residual and wastewater.…”

Section: Introductionmentioning

confidence: 99%

An Environment-Friendly Process Featuring Calcified Roasting and Precipitation Purification to Prepare Vanadium Pentoxide from the Converter Vanadium Slag

Zhang

Xue

2018

Metals

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Converter vanadium slag is a byproduct of the iron making process when the vanadium titanomagnetite is used as iron raw material. A cleaner process including calcified roasting, dilute acid leaching, precipitation purification, vanadium precipitation with ammonium salt, followed by thermal decomposition was proposed to extract vanadium resource from this slag. And then vanadium pentoxide with purity over 98% was prepared, which can be used as additives for high strength low alloy steel production. A total vanadium recovery beyond 80% was achieved in this whole process. Since no sodium and potassium salt was introduced, wastewater generated was closed-circulating after removing the enriched impurities of P, Si, Ti and Cr with adding powder CaO. The content of V2O5 in residues after vanadium extraction was lower than 1.2 wt.%, while other valuable metals like Fe, Mn, Cr and Ti were concentrated. With no alkaline metal salts added in this process, the metal resources of Fe, Mn, Cr and Ti in the residues were more feasible to be recovered with pyrometallurgy processes.

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“…There are about 65 types of vanadium-containing minerals in the world and the main raw material for vanadium extraction is titanomagnetite, accounting for about 88% of vanadium production (Qiu et al, 2011). During steelmaking process using titanomagnetite ores vanadium slag is formed and it is the direct source of vanadium extraction (Wang et al, 2015). The vanadium slag is roasted with NaCl, Na2CO3, or Na2SO4 at 750-850 °C under an oxidation environment in a rotary kiln or a multiple hearth furnace during the traditional vanadium production process (Voglauer et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al, 2013, H.-B. Liu et al, 2013Wang et al, 2015). Many improved roasting methods have been developed to improve the vanadium yield and reduce the hazardous residue production by using calcium oxides to replace sodium salts as additives (Li et al, 2011;Li et al, 2016;Yang et al, 2014;Zhang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Intensified decomposition of vanadium slag via aeration in concentrated NaOH solution

Liu

Wang

et al. 2017

International Journal of Mineral Processing

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A new metallurgical process via aeration for the decomposition of vanadium slag in concentrated NaOH solutionwas proposed. The improvement of oxygen mass transfer coefficient when using aeration at different NaOH concentration was studied and the effects of critical reaction parameters on vanadium extraction were systematically investigated. The optimal condition was determined to be: alkali concentration of 60%, reaction temperature of 130 °C, alkali-to-ore mass ratio of 6:1, stirring speed of 500 rpm. The yield of vanadium could reach to 97.41% after reacting for 6 h under this reaction condition. The reaction temperature in this new method is 50-270 °C lower than the current liquid oxidation methods reported in the literatures, and the medium alkaline concentration declined from 85% to 60%, exhibiting significant advantages in energy consumption as well as reactor design. Kinetics study indicated that the extraction of vanadium was governed by internal diffusion, and the apparent activation energy was calculated to be 17.57 kJ/mol.

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Electrochemical decomposition of vanadium slag in concentrated NaOH solution

Cited by 82 publications

References 11 publications

A green method to leach vanadium and chromium from residue using NaOH-H2O2

A green method to leach vanadium and chromium from residue using NaOH-H2O2

An Environment-Friendly Process Featuring Calcified Roasting and Precipitation Purification to Prepare Vanadium Pentoxide from the Converter Vanadium Slag

Intensified decomposition of vanadium slag via aeration in concentrated NaOH solution

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