Influence Law of Solution pH on Separation of Vanadium and Tungsten by Ion Exchange Adsorption AITranslate
Abstract AITranslate
Abstract.Selective separation of vanadium and tungsten from the simulated NaOH leaching solution of waste SCR denitration catalyst by anion exchange resin was studied. The effect of solution pH change on adsorption behavior of vanadium and tungsten onto the resin was investigated. The experimental results show that solution pH change has little influence on W adsorption under the alkaline condition,but has re- markable influence on V adsorption. When pH increases from 8 to 12, the main ion form of V is trans- formed from V4O12^4- to HVO4^2- , resulting in greatly reduced adsorption ability of V onto the resin. When pH increases from 12 to 14,the increase of OH^- concentration becomes the main factor affecting the ad- sorption of V and W. Due to the adsorption capacity of WO4^2-〉VO4^3-〉OH^- ,the inhibition effect of in- creased OH^- concentration on V adsorption is more obvious,resulting in further weakening of V adsorp- tion. As pH increases from 8 to 14,W/V separation coefficient increases from 0. 146 to 2.36. When pH is equal to 14 and the loaded resin is eluted with a mixed solution of 1 mol/L NaOH ＋ 2 mol/L NaCl,the maximum desorption concentration of W can reach 84 g/L,while the maximum value of V is not more than 2 g/L. As a result,the separation of tungsten and vanadium is achieved to some extent,tungsten is enriched to a certain extent,and the desorbed liquid can be used as a mother liquid for the subsequent calcium pre- cipitation or crystallization process.
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Basic Information:
DOI：
Chinese Library Classification Number:TF804.3[冶金工程—有色金属冶金]
Citation Information:
Abstract.Selective separation of vanadium and tungsten from the simulated NaOH leaching solution of waste SCR denitration catalyst by anion exchange resin was studied. The effect of solution pH change on adsorption behavior of vanadium and tungsten onto the resin was investigated. The experimental results show that solution pH change has little influence on W adsorption under the alkaline condition,but has re- markable influence on V adsorption. When pH increases from 8 to 12, the main ion form of V is trans- formed from V4O12^4- to HVO4^2- , resulting in greatly reduced adsorption ability of V onto the resin. When pH increases from 12 to 14,the increase of OH^- concentration becomes the main factor affecting the ad- sorption of V and W. Due to the adsorption capacity of WO4^2-〉VO4^3-〉OH^- ,the inhibition effect of in- creased OH^- concentration on V adsorption is more obvious,resulting in further weakening of V adsorp- tion. As pH increases from 8 to 14,W/V separation coefficient increases from 0. 146 to 2.36. When pH is equal to 14 and the loaded resin is eluted with a mixed solution of 1 mol/L NaOH ＋ 2 mol/L NaCl,the maximum desorption concentration of W can reach 84 g/L,while the maximum value of V is not more than 2 g/L. As a result,the separation of tungsten and vanadium is achieved to some extent,tungsten is enriched to a certain extent,and the desorbed liquid can be used as a mother liquid for the subsequent calcium pre- cipitation or crystallization process.
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| GB/T 7714-2015 | [1] LIU Ding-ding, SONG Hao, WU Wei-hong, et al. Influence Law of Solution pH on Separation of Vanadium and Tungsten by Ion Exchange Adsorption[J]. Rare Metals and Cemented Carbides, 2018(5): 7-12. |
| MLA | [1] LIU Ding-ding, et al., "Influence Law of Solution pH on Separation of Vanadium and Tungsten by Ion Exchange Adsorption." Rare Metals and Cemented Carbides, no. 5, 2018, pp. 7-12. |
| APA | [1] LIU Ding-ding, SONG Hao, WU Wei-hong, ZHENG Cheng-hang, QIU Kun-zan, & GAO Xiang. (2018). Influence Law of Solution pH on Separation of Vanadium and Tungsten by Ion Exchange Adsorption. Rare Metals and Cemented Carbides(5), 7-12. |
| IEEE | [1] LIU Ding-ding, SONG Hao, WU Wei-hong, ZHENG Cheng-hang, QIU Kun-zan, and GAO Xiang, "Influence Law of Solution pH on Separation of Vanadium and Tungsten by Ion Exchange Adsorption," Rare Metals and Cemented Carbides, no. 5, pp. 7-12, 2018. keywords: {waste SCR denitration eatalyst;separation of vanadium and tungsten;ion exchange;pH;ion form} |