Title: Recovery Of Vanadium From Thermal Power Plant Ash Of Uzbekistan
Authors: Mutalibkhonov S.S.
Volume: 10
Issue: 5
Pages: 37-46
Publication Date: 2026/05/28
Abstract:
The recovery of vanadium (V) from thermal power plant ash represents a critical opportunity for resource sustainability and waste valorization. This study synthesizes findings from ten peer-reviewed Scopus-indexed publications to systematically analyze extraction methodologies, optimal operational parameters, and product characterization pathways. Comparative analysis of acidic leaching (H?SO?, HCl, HNO?), alkaline leaching (NaOH, Na?CO?), roasting-water leaching, pressure oxidation with HNO?/O?, solvent extraction (D2EHPA/TBP), and novel molecular extraction techniques reveals leaching efficiencies ranging from 65% to 98% under optimized conditions. Heavy oil fly ash (HOFA) samples containing 2-5 wt% vanadium yielded maximum V recoveries of 99.75% through sequential Mn-mediated precipitation coupled with hydrolysis-calcination routes. Characterization via XRD, SEM-EDS, BET, FTIR, and TGA confirms phase transformation mechanisms and purity achievement of >99% V?O?. Thermodynamic analysis indicates favorable extraction pathways (?G < 0 kJ/mol) across 25-200°C operating ranges. This synthesis establishes that integrated hydrometallurgical-pyrometallurgical hybrid processes optimize both recovery efficiency and product quality while minimizing environmental burden. Key recommendations focus on process intensification through solvent extraction pre-concentration, selective precipitation via ammonium sulfate chemistry, and circular economy integration of recovered metals into vanadium redox batteries and high-strength steel alloys.