Influence of hydrogen peroxide on acid leaching of vanadium from spent catalysts
DOI:
https://doi.org/10.15587/1729-4061.2015.36014Keywords:
catalyst, vanadium, leaching, hydrogen peroxide, thermohydrolysisAbstract
Vanadium leaching from spent catalysts of sulfur dioxide conversion in sulfuric acid solutions with the addition of an auxiliary agent - hydrogen peroxide was investigated. It is shown that the formation of peroxide derivatives of vanadium improves the leaching degree by 30-40% for low-temperature catalysts, containing rubidium and cesium sulfates as promoters. Acid concentration has a weak influence on the leaching degree and may be limited to 5-10 g/l. Low acidity of leaching solutions allows to carry out the thermohydrolytic deposition of pentavalent vanadium without prior neutralization and introduction of extraneous cations with alkali. Solutions, after vanadium deposition, can be returned to the leaching stage, which contributes to their concentrating on valuable rare-metal salt components and reduces the cost of evaporation. 90-95% vanadium extraction in leaching solution was reached, through vanadium extraction is 86-90%.
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