| Texto completo | |
| Autor(es): |
Vinco, Jose Helber
;
Duarte, Heitor Augusto
;
Espinosa, Denise Crocce Romano
;
Tenorio, Jorge Alberto Soares
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | HYDROMETALLURGY; v. 240, p. 14-pg., 2026-02-01. |
| Resumo | |
Vanadium (V), predominantly used in steel production, is also a critical element for energy storage in redox flow batteries; however, producing high-purity vanadium remains challenging. This study reports, for the first time, the use of the anion-exchange resin LSC775(SO4) (polystyrene-based and in the sulfate form) for selective vanadium recovery from a real industrial leachate, motivated by vanadium(V) predominating as anionic vanadate species at the working pH. The feed solution originated from a secondary aqueous heap leaching, following alkaline roasting and primary leaching of vanadiferous titanomagnetite. It had a highly alkaline pH (10.3) and contained 3.7 g L-1 V (similar to 33 %), with major contaminants Na, Si, and K (similar to 67 %) and minor Ca, Mg, P, Mo, Al, and Fe (similar to 0.2 %). Batch adsorption experiments were carried out to evaluate vanadium uptake, including equilibrium, kinetics, and thermodynamics. Fixed-bed column tests assessed vanadium breakthrough behavior, capacity, and resin reusability. Optimal V adsorption occurred at pH 2.0, consistent with the anion-exchange mechanism. The data followed the Langmuir isotherm and the pseudo-second order kinetic model, indicating monolayer adsorption via chemisorption. Thermodynamic parameters confirmed the process is endothermic (Delta H-0 > 0) and spontaneous (Delta G(0) < 0). In continuous-flow conditions (2 bed volumes per hour, 10 cycles), adsorption and elution efficiencies averaged 97.4 % and 98.9 %, respectively. The maximum adsorption capacity, per the Thomas model, was 249 mg g(-1). The resin maintained high performance over multiple cycles, confirming its stability and recyclability. Vanadium was recovered by precipitation and calcination, yielding V2O5 with >99.99 % purity. This work demonstrates the first successful application of LSC775(SO4) to selective vanadium recovery from a contaminant-rich secondary leachate. (AU) | |
| Processo FAPESP: | 22/02213-0 - Obtenção de metais críticos de alta pureza a partir de minérios vanadiníferos: purificação de soluções industriais e aproveitamento de resíduos |
| Beneficiário: | José Helber Vinco |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 24/16387-6 - Recuperação de escândio do resíduo da fração magnética de um minério de titanomagnetita contendo vanádio |
| Beneficiário: | José Helber Vinco |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 19/11866-5 - Desenvolvimento de processos inovadores para recuperação de metais críticos |
| Beneficiário: | Denise Crocce Romano Espinosa |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |