Study on Hydrometallurgical Extraction of Molybdenum and Vanadium from Spent HDS Catalysts AITranslate

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Chinese Library Classification Number:X705[环境科学与工程—环境工程]

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Molybdenum and vanadium were recovered from spent HDS catalysts by two-stage hydrometallurgical extraction including NaOH leaching and H2O2 oxidation leaching without roasting pretreatment at atmospheric pressure.The effects were studied of the dosage of NaOH and H2O2,leaching temperature,leaching time and solid-liquid ratio on molybdenum and vanadium leaching.The results show that the leaching rate of molybdenum and vanadium is greatly influenced by NaOH and H2O2 dosage,increasing along with the increase of the dosage under certain conditions.However,leaching temperature and time have less effects.In addition,the leaching rate of molybdenum decreases with the increase of liquid-solid ratio.After a simple pretreatment of raw material,the leaching rate of molybdenum and vanadium can be above 90%under the optimal experimental conditions as follows：mass ratio of NaOH to Mo and V of 2.5∶1,ratio of H2O2 total volume to spent catalyst mass of 0.8∶1,liquid-solid ratio of 2∶1,NaOH leaching time of 1h,H2O2 batch-feeding leaching time of 2h,and temperature of 35 ℃.