Source separation of vanadium over iron from roasted vanadium-bearing shale during acid leaching via ferric fluoride surface coating

Source separation of vanadium over iron from roasted vanadium-bearing shale during acid leaching... The vanadium in acid leachates of vanadium-bearing (V-bearing) shale is usually contaminated by massive impurities during leaching, especially iron impurity. Therefore, the separation of vanadium from iron impurity at source for the production of high purity vanadium products is of great necessity because of increasing demand for vanadium products in the fields of vanadium redox flow battery, specialty steel alloy and catalyst. In this paper, the source separation of vanadium over iron from roasted vanadium-bearing shale during acid leaching was achieved via FeF3 surface coating. Under the conditions of a H2SO4 concentration of 20 vol%, a leaching temperature of 95 °C, a leaching time of 4 h and a liquid–solid ratio of 1.5 mL/g, 89.8% of the vanadium leaching efficiency was obtained with only 5.2% of the iron leached with a CaF2 addition of 5 wt%; however, 20.9% of the iron and only 66.2% of the vanadium were leached without CaF2 addition. The enhancement of vanadium leaching efficiency was mainly attributed to the muscovite disintegration in HF generated from the reaction between CaF2 and H2SO4. The suppression of iron leaching behavior was due to the surface passivation of hematite coated with FeF3 which was generated from the reactions of Fe2O3 and FeSO4+ with HF. The FeF3 coating can prevent the attack of H+ and SO42− on the hematite; therefore, the source separation of vanadium over iron during acid leaching was realized. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Cleaner Production Elsevier

Source separation of vanadium over iron from roasted vanadium-bearing shale during acid leaching via ferric fluoride surface coating

Loading next page...
 
/lp/elsevier/source-separation-of-vanadium-over-iron-from-roasted-vanadium-bearing-3Llff00DU7
Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0959-6526
D.O.I.
10.1016/j.jclepro.2018.01.226
Publisher site
See Article on Publisher Site

Abstract

The vanadium in acid leachates of vanadium-bearing (V-bearing) shale is usually contaminated by massive impurities during leaching, especially iron impurity. Therefore, the separation of vanadium from iron impurity at source for the production of high purity vanadium products is of great necessity because of increasing demand for vanadium products in the fields of vanadium redox flow battery, specialty steel alloy and catalyst. In this paper, the source separation of vanadium over iron from roasted vanadium-bearing shale during acid leaching was achieved via FeF3 surface coating. Under the conditions of a H2SO4 concentration of 20 vol%, a leaching temperature of 95 °C, a leaching time of 4 h and a liquid–solid ratio of 1.5 mL/g, 89.8% of the vanadium leaching efficiency was obtained with only 5.2% of the iron leached with a CaF2 addition of 5 wt%; however, 20.9% of the iron and only 66.2% of the vanadium were leached without CaF2 addition. The enhancement of vanadium leaching efficiency was mainly attributed to the muscovite disintegration in HF generated from the reaction between CaF2 and H2SO4. The suppression of iron leaching behavior was due to the surface passivation of hematite coated with FeF3 which was generated from the reactions of Fe2O3 and FeSO4+ with HF. The FeF3 coating can prevent the attack of H+ and SO42− on the hematite; therefore, the source separation of vanadium over iron during acid leaching was realized.

Journal

Journal of Cleaner ProductionElsevier

Published: Apr 20, 2018

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from
Google Scholar,
PubMed
Create lists to
organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off