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Recoveryof vanadium from various sources is important to the environmentand industry. This work investigates vanadium leaching from a spentselective catalytic reduction catalyst by sulfuric acid at atmosphericpressure. It includes the effects of stirring speed, solid to liquidratio, temperature, and sulfuric acid concentration on the vanadiumrecovery yield. The results show that the vanadium recovery yieldincreases with increases in temperature, sulfuric acid concentration,and leaching time and decreases with an increase in solid to liquidratio. The leaching data can not be described well by kinetic modelscommonly adopted for similar processes in the literature. The Avramiequation, originally developed for crystallization, is found to bemost suitable. The leaching is controlled by diffusion in the solidwith an activation energy of 5.90 kJ/mol. [ABSTRACT FROM AUTHOR]