Wastes generated from the Bayer’s process serve as valuable resources for aluminum, vanadium, gallium, etc. This work aims to develop a environmentally acceptable and low-cost chemical leaching-cumpurification method for the recovery of vanadium sludge of Indian alumina plant (10–12% V2O5) and synthesize vanadium pentaoxide. The efficiency of leaching was evaluated by various lixiviants like acidified water, H2SO4, soda and NaOH against variation in pulp density and temperature. Maximum extraction (96%) vanadium was achieved using acidified water leaching at above ambient temperature in 1 h with 200 g/L pulp density following diffusion control model. Finally, the vanadium rich leach liquor was purified by steps of adsorption/precipitation etc., to remove with iron and silica to get vanadium pentaoxide. A high purity product of 99% V2O5 was obtained by allowing the adsorption at acidic pH followed by desorption and precipitation at 90°C.
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Meshram, P., Kumari, J. & Pandey, B.D. Extraction of vanadium and synthesis of vanadium pentaoxide from Bayer’s sludge. Russ. J. Non-ferrous Metals 57, 338–346 (2016). https://doi.org/10.3103/S1067821216040064
- vanadium sludge
- aqueous leaching
- diffusion controlled model
- vanadium pentaoxide