Extraction and separation of molybdenum and vanadium from alkaline leaching

Authors

  • Jamal Stas
  • Ajaj Dahdouh
  • Omar Al-Chayah
https://doi.org/10.3311/pp.ch.2010-2.05

Abstract

Extraction of vanadium and molybdenum from alkaline leaching solution of boiler ash was investigated. The ash coming from heavy oil-fired electrical power station was leached with 8 mol dm^-3 sodium hydroxide at 373 K. The leaching solution was cooled to 278 K; an alkali-precipitate was precipitated. The precipitate was dissolved in sulfuric acid and a selective solvent extraction process was applied. First, almost all the molybdenum was extracted with 1.5% (v/v) tri-n-dodecylamine/kerosene, stripped with 0.5 mol dm-3 NaOH and precipitated with CaCl2 as CaMoO4, then acidified with 30% HNO3, the resulting H2MoO4.H2O was calcinated at 723 K for 4 hours to give molybdenum oxide, next the vanadium was extracted from the raffinate coming from the first solvent extraction with 25% (v/v) tri-n-dodecylamine/kerosene at pH 1.8, stripped with 0.5 mol dm-3 NaOH, precipitated with (NH4)_2SO4 at pH between 7.5-8.5 as ammonium metavanadate and calcinated at 773 K for twenty four hours to yield 99.9% vanadium pen toxide.

Keywords:

Fly ash, extraction, molybdenum, vanadium, tri-n-dodecylamine

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How to Cite

Stas, J., Dahdouh, A., Al-Chayah, O. “Extraction and separation of molybdenum and vanadium from alkaline leaching”, Periodica Polytechnica Chemical Engineering, 54(2), pp. 87–93, 2010. https://doi.org/10.3311/pp.ch.2010-2.05

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