Reaction Mechanism of Magnesium in Roasting of Vanadium Slag



Título del documento: Reaction Mechanism of Magnesium in Roasting of Vanadium Slag
Revista: Anais da Academia Brasileira de Ciencias
Base de datos: PERIÓDICA
Número de sistema: 000436056
ISSN: 0001-3765
Autores: 1
1
1
Instituciones: 1Northeastern University, Institute of Metallurgical Resources and Environmental Engineering, Shenyang, Liaoning. China
Año:
Volumen: 92
Número: 2
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Aplicado, descriptivo
Resumen en inglés The influence of magnesium on roasting vanadium slag was investigated by simulating the roasting process of vanadium by mixing V2O5 and MgO. The calcination products of V2O5 reacted with MgO at different temperatures which were characterized by X-ray diffraction (XRD), Thermogravimetry-differential scanning calorimetry (TG-DSC) and scanning electron microscope (SEM). There were two mass loss intervals, three endothermic peaks and one exothermic peak appearing during the reaction by the integrated thermal analysis as the temperature increased from room temperature to 1273.15 K. The samples of mixed V2O5 and MgO began to melt at 573.15 K and reacted at 773 K, and the shape of the particles changed from block to ovoid or irregular sphere at 773.15 K. With increasing the reaction temperature from 973.15 to 1073.15 K, the intermediate of VO2 was produced, and MgV2O6 was partially decomposed at 1073.15 K. During this process, the particle shape gradually returned to block shape. The conversion rate of vanadium is 99.4% with MgO of 1.65%
Disciplinas: Ingeniería
Palabras clave: Ingeniería metalúrgica,
Escoria de vanadio,
Tostado,
Magnesio,
Mecanismo de reacción
Keyword: Metallurgical engineering,
Vanadium slag,
Roasting,
Reaction mechanism,
Magnesium
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