title: Vanadium removal and recovery from bauxite residue leachates by ion exchange.
abstract: Bauxite residue is an important by-product of the alumina industry, and current management practices do not allow their full valorisation, especially with regard to the recovery of critical metals. This work aims to test the efficiency of ion exchange resins for vanadium (V) removal and recovery from bauxite residue leachates at alkaline pH (11.5 and 13). As an environmental pollutant, removal of V from leachates may be an obligation of bauxite residue disposal areas (BRDA) long-term management requirements. Vanadium removal from the leachate can be coupled with the recovery, and potentially can be used to offset long-term legacy treatment costs in legacy sites. Kinetics studies were performed to understand the adsorption process. The rate kinetics for the V adsorption was consistent with the pseudo-first-order kinetic model, with a higher adsorption rate for pH 11.5 (1.2 min-1). Adsorption isotherm data fitted better to Freundlich equations than to the Langmuir model. The maximum adsorption capacity (Langmuir value qmax) was greatest for pH 13 (9.8 mg V g-1resin). In column tests, breakthrough was reached at 70 bed volumes with the red mud leachate at pH 13, while no breakthrough was achieved with the effluent at pH 11.5. In regeneration, 42 and 76 % of V were eluted from the resin with 2 M NaOH from the red mud leachate at pH 13 and 11.5, respectively. Further optimization will be needed to upscale the treatment.
authors: School of Biological, Biomedical and Environmental Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK. h.gomes@hull.ac.uk.
authors: Helena I
authors: HI
authors: Gomes
authors: School of Biological, Biomedical and Environmental Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
authors: Ashley
authors: A
authors: Jones
authors: Department of Geography, Environment and Earth Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
authors: Mike
authors: M
authors: Rogerson
authors: School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK.
authors: Ian T
authors: IT
authors: Burke
authors: School of Biological, Biomedical and Environmental Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
authors: William M
authors: WM
authors: Mayes
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D007474:Ion Exchange; D007475:Ion Exchange Resins / Q000737:chemistry; D007700:Kinetics; D014639:Vanadium / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid
chemical_list: D007475:Ion Exchange Resins; D014639:Vanadium; D000537:Aluminum Oxide
keywords: Alkaline drainage; Anion exchange resin; Metal recovery; Recycling; Red mud; Sorption