Operational variable effects on heavy metals acid leaching present in fly ash

Lourdes Piña, Eligleys Dorante, Cézar García, José González, Karina Martínez

Resumen


In this research work the operational variable effects are analyzed on vanadium and nickel acid leaching, both present in fly ash from fuel oil combustion. The samples used correspond to fly ash coming from a thermoelectric plant. The extraction procedure includes batch acid leaching varying: temperature, particle size, acid concentration and stirring time. Metal content is determined by atomic absorption spectrophotometry. The following leaching conditions gave good vanadium recovery: a) 20% sulfuric acid, 40°C, original sample, 6 hours contact time and 4230 mgV/L maximum concentration. b) 20% nitric acid, 50°C, original sample, 6 hours contact time and 3869 mgV/L maximum concentration. c) 20% hydrochloric acid, 50°C, original sample, 4 hours contact time and 4290 mgV/L maximum concentration (with 100% extraction). The following leaching conditions gave good nickel recovery: a) 20% sulfuric acid, 40°C, original sample, 2 hours contact time and 294. 50 mgNi/L maximum concentration. b) 20% Nitric acid, 50°C, original sample, 6 hours contact time and de 325 mgNi/L maximum concentration. c) 20% Hydrochloric acid, 50°C, original sample, 6 hours contact time and 373.50 mgNi/L maximum concentration. Vanadium and Nickel have been efficiently recovered from oil fly ash.


Palabras clave


acid leaching; fly ash; vanadium and nickel

Texto completo:

PDF




Universidad del Zulia /Venezuela/ Revista Técnica de la Facultad de Ingeniería/ revistatecnica@gmail.com /

p-ISSN: 0254-0770 / e-ISSN: 2477-9377 

 

Licencia de Creative Commons
Este obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-CompartirIgual 3.0 Unported.