Abstract
Significant volumes of waste from mining and metallurgical production (ore tails and metallurgical slags) worsen the ecological situation in industrial regions, but at the same time, they represent a unique source of many technically valuable rare and trace metals, one of which is vanadium. The prospects for the vanadium market (in terms of demand and prices) and the optimism of its consumption forecasts for the coming years are shown. In this regard, the inclusion of vanadium-containing waste in industrial processing simultaneously solves two actual problems – resource saving and environmental protection. The study purpose is the vanadium extraction from the Ural titanomagnetite ore tails and vanadium-containing metallurgical slags of different chemical composition using the hydrometallurgical method. The study objectives are: to determine the effect of various chemical reagents and the temperature regimes for oxidizing roasting on the vanadium extraction degree; comparison of vanadium extraction efficiency in aqueous and acid leaching. The vanadium content in the resulting solutions and solid samples was determined by X-ray fluorescence spectroscopy (XFS). The study result analysis showed the following: the choice of reagents and roasting regimes of the charge with vanadium-containing waste must be carried out taking into account their chemical composition; the best roasting reagents are NaCl and Na2CO3; the highest vanadium extraction degree amounted to almost 75–92 % and were obtained with a 50 % roasting reagent content in the charge, after roasting at a temperature of 950 °C and subsequent aqueous or acid leaching.
Keywords:
Titanomagnetite ore, ore enriched tails, metallurgical slags, vanadium, oxidizing roasting, vanadium leaching, vanadium extraction degree.