Abstract:With strong alkaline anion-exchange resin 717 as the sorbent and NaOH solution as the eluent, a study on the sorption from alkaline solution and elution of vanadium(V), silicon(IV), and aluminium(III) was carried out. Different parameters affecting the sorption and elution process, including temperature, pH values as well as the ratio of resin to solution, were investigated. The results show that sorption degree of vanadium(V) increases with a decrease of pH values, and V(V) ions are easier sorbed than Si(IV) … Show more
“…In test 1, 42 % of vanadium was recovered with 2 bed volumes of NaOH, whereas in test 2 the V recovery was 76 % with 3.5 bed volumes. This value is consistent with others in the literature, that report an 82 % V desorption using 2 M NaOH (Hua et al 2010). Fig.…”
Section: Resultssupporting
confidence: 93%
“…Prior to use, the resin was washed with water until the supernatant became clear and colourless, and then soaked in deionized water for 6 h, with 5 wt.% NaOH solution for 4 h, and again washed with deionized water until the supernatant pH was in the range of 8–9 (Huang et al 2010). The resin was consequently used in the hydroxide form.…”
Section: Methodsmentioning
confidence: 99%
“…Vanadium is mostly used in ferrous and non-ferrous alloys (Song et al 2014), as well as for catalysts in automobiles, and in the chemical and polymer industries (Keränen et al 2013; Navarro et al 2007). The current recovery methods from secondary sources are based on ion exchange (Huang et al 2010; Keränen et al 2013; Li et al 2013; Nguyen and Lee 2013; Zeng et al 2009; Zhao et al 2010), solvent extraction (Barik et al 2014; Kim et al 2014) and bioleaching (Mirazimi et al 2015). Although, ion exchange resins have been used previously for V recovery or removal, limited data exist on feed solutions with a pH higher than 10 (Huang et al 2010), and none with bauxite residue leachate.…”
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 q
max) was greatest for pH 13 (9.8 mg V g−1 resin). 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.
“…In test 1, 42 % of vanadium was recovered with 2 bed volumes of NaOH, whereas in test 2 the V recovery was 76 % with 3.5 bed volumes. This value is consistent with others in the literature, that report an 82 % V desorption using 2 M NaOH (Hua et al 2010). Fig.…”
Section: Resultssupporting
confidence: 93%
“…Prior to use, the resin was washed with water until the supernatant became clear and colourless, and then soaked in deionized water for 6 h, with 5 wt.% NaOH solution for 4 h, and again washed with deionized water until the supernatant pH was in the range of 8–9 (Huang et al 2010). The resin was consequently used in the hydroxide form.…”
Section: Methodsmentioning
confidence: 99%
“…Vanadium is mostly used in ferrous and non-ferrous alloys (Song et al 2014), as well as for catalysts in automobiles, and in the chemical and polymer industries (Keränen et al 2013; Navarro et al 2007). The current recovery methods from secondary sources are based on ion exchange (Huang et al 2010; Keränen et al 2013; Li et al 2013; Nguyen and Lee 2013; Zeng et al 2009; Zhao et al 2010), solvent extraction (Barik et al 2014; Kim et al 2014) and bioleaching (Mirazimi et al 2015). Although, ion exchange resins have been used previously for V recovery or removal, limited data exist on feed solutions with a pH higher than 10 (Huang et al 2010), and none with bauxite residue leachate.…”
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 q
max) was greatest for pH 13 (9.8 mg V g−1 resin). 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.
“…In ion exchange process, D296 (Hu et al, 2009) or some chelating resins are usually applied to separate vanadium from neutral solution, and 201*7 (commercial name in China is 717) resin is used to adsorb vanadium from alkaline solution (Huang et al, 2010). In acidic solution, the ion exchange is used to recover vanadium by D314 resin from the feedstock with fewer metallic impurities (Hu et al, 2009;Wang et al, 2010;.…”
“…Solvent extraction [9][10][11] and ion exchange 12,13 are the two most frequently used methods to obtain a concentrated vanadium solution. The ion exchange process is cost-effective and easy to operate, and various types of resins have been reported to recover vanadium from a neutral solution 14 , alkaline solution 15 , or acid solution 16 . However, ion exchange is more often applied to extract V(V) from low acid solutions with low concentrations of impurities.…”
ABSTRACT:The effect of K 2 SO 4 on the vanadium extraction with bis(2-ethylhexyl) phosphoric acid (D2EHPA)/tributyl phosphate (TBP) was studied in a pressure acid leaching system of stone coal. K 2 SO 4 intervention achieved good removal of Al and Fe on the premise of high V leaching efficiency during pressure acid leaching. Studies show that when the K 2 SO 4 dosage is 7 wt.%, the H 2 SO 4 concentration is 15 vol.%, the liquid/solid ratio is 1.5 ml/g, the leaching temperature is 190°C, and the leaching time is 5 h, then 90% of V can be leached, but only 30% of Al and 6% of Fe are leached together. After four-stage countercurrent extraction with 20% vol D2EHPA at pH 1.8, the loaded organic phase showed a feature of more V ions with fewer Al and Fe ions, indicating that K 2 SO 4 intervention reduced the impurity load of vanadium extraction from stone coal acid leaching solution.
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