Comparison of ion exchange and solvent extraction in recovering vanadium from sulfuric acid leach solutions of stone coal

Li, Wang; Zhang, Yimin; Liu, Tao; Huang, Jing; Wang, Yi

doi:10.1016/j.hydromet.2012.09.009

Cited by 156 publications

(47 citation statements)

References 18 publications

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“…11,12 Particularly detrimental is Fe, a type of valence variable ion that mostly comes from the pyrite in stone coal, as it will seriously affect the enrichment process of V from the V leaching liquor and the nal V-bearing products. 8,13,14 In most cases, V and Fe are separated from the acid leaching liquor by ion exchange, solvent extraction and chemical precipitation.…”

Section: -10mentioning

confidence: 99%

Source separation of V and Fe by two-stage selective leaching during V extraction from stone coal

et al. 2017

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A method of two stage selective leaching for separation of V and Fe during V extraction from stone coal was developed. In the primary procedure stone coal was roasted in an inert atmosphere at 900 C for 1 h, and then the roasted product was leached for Fe removal in 7% (vol%) H 2 SO 4 at 30 C for 30 min when the liquid-to-solid ratio (L/S) was 3 : 1 mL g À1. The Fe removal residue was then leached under the conditions of 20% (vol%) H 2 SO 4 , L/S ¼ 2 : 1 mL g À1, at 95 C for 4 h. In the first stage, 98.1% Fe could be removed from the roasted product with only 2.0% V loss. In the second stage, a 97.8% V leaching efficiency was obtained, which was 10.4% higher than the leaching efficiency of the roasted product using one-stage leaching. Based on the different solubilities in acid of muscovite and FeS, the decomposition product of pyrite at high temperature in an inert atmosphere, this method admirably prevented Fe from entering the V leaching liquor, realizing source separation of V and Fe during V extraction from stone coal.

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Section: -10mentioning

confidence: 99%

Source separation of V and Fe by two-stage selective leaching during V extraction from stone coal

et al. 2017

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“…After that, the vanadium is liberated from crystal structure and converted to water or acid soluble vanadate [5], which is subsequently recovered by water leaching and/or acid leaching, ion purification, vanadium precipitation, and calcination [6][7][8]. For the process of vanadium extraction from stone coal, the vanadium recovery by the roasting-leaching procedure is around 65-75%, while for other procedures, such as ion exchange, solvent extraction, and vanadium precipitation, the vanadium recoveries are more than 97% [9,10]. Therefore, the total vanadium recovery depends on the vanadium recovery of the roasting-leaching step [11].…”

Section: Introductionmentioning

confidence: 99%

Vanadium Transitions during Roasting-Leaching Process of Vanadium Extraction from Stone Coal

Zhao

Chen

et al. 2018

Minerals

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Abstract:The vanadium occurrence in stone coal, water leaching, and acid leaching residue was investigated by energy dispersive spectrometer (EDS) mapping and point analysis, and the vanadium transitions during roasting-leaching of stone coal were revealed. In the roasting process, vanadium-bearing muscovite is converted to K-Na-feldspar, accompanying the liberation of vanadium. Most liberated vanadium reacts with sodium salt to generate water-soluble sodium vanadate, some reacts with calcite in stone coal to form water-insoluble calcium vanadate, and other liberated vanadium exists as free vanadium oxide. However, for coarse muscovite grains, the reaction of muscovite converted to K-Na-feldspar only occurs at the outer margin of muscovite grains, and the vanadium in the interior of muscovite grains is not liberated. During water leaching, the sodium vanadate is leached out. The calcium vanadate and free vanadium oxide are dissolved out in the process of acid leaching, and the vanadium, presenting in muscovite grains surrounded by K-Na-feldspar, still remains in the acid leaching residue. Two suggestions, including optimization of grinding-classification process and adopting microwave roasting, were proposed for improving vanadium recovery according to the vanadium transition rules.

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“…Some studies have been conducted to investigate effects of metal ions on solvent extraction of V(IV) by D2EHPA, concluding that this extractant presents excellent selectivity to V(IV) over K, Na, and Mg ions but weak selectivity over Al and Fe ions in the acid leaching solution of stone coal 22 . Thus the stages of vanadium extraction with D2EHPA will be long because of co-extractions of massive Al and Fe ions, which increases the impurity load of vanadium extraction prolonging the production recycle.…”

Section: Introductionmentioning

confidence: 99%

Effect of K2SO4 on solvent extraction of vanadium with D2EHPA/TBP

Xue¹,

Zhang²,

Liu³

et al. 2017

ScienceAsia

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ABSTRACT:The effect of K 2 SO 4 on the vanadium extraction with bis(2-ethylhexyl) phosphoric acid (D2EHPA)/tributyl phosphate (TBP) was studied in a pressure acid leaching system of stone coal. K 2 SO 4 intervention achieved good removal of Al and Fe on the premise of high V leaching efficiency during pressure acid leaching. Studies show that when the K 2 SO 4 dosage is 7 wt.%, the H 2 SO 4 concentration is 15 vol.%, the liquid/solid ratio is 1.5 ml/g, the leaching temperature is 190°C, and the leaching time is 5 h, then 90% of V can be leached, but only 30% of Al and 6% of Fe are leached together. After four-stage countercurrent extraction with 20% vol D2EHPA at pH 1.8, the loaded organic phase showed a feature of more V ions with fewer Al and Fe ions, indicating that K 2 SO 4 intervention reduced the impurity load of vanadium extraction from stone coal acid leaching solution.

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Comparison of ion exchange and solvent extraction in recovering vanadium from sulfuric acid leach solutions of stone coal

Cited by 156 publications

References 18 publications

Source separation of V and Fe by two-stage selective leaching during V extraction from stone coal

Source separation of V and Fe by two-stage selective leaching during V extraction from stone coal

Vanadium Transitions during Roasting-Leaching Process of Vanadium Extraction from Stone Coal

Effect of K2SO4 on solvent extraction of vanadium with D2EHPA/TBP

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