Vanadium removal and recovery from bauxite residue leachates by ion exchange.
Vanadium removal and recovery from bauxite residue leachates by ion exchange.
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DOI：
10.1007/s11356-016-7514-3
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发表时间：
2016-11
期刊：
影响因子：
--
通讯作者：
Mayes WM
中科院分区：
文献类型：
--
作者：
Gomes HI;Jones A;Rogerson M;Burke IT;Mayes WM
铝土矿渣是氧化铝工业的重要副产品，目前的管理做法不允许其充分增值，特别是在回收关键金属方面。本工作旨在测试离子交换树脂在碱性pH（11.5和13）下从铝土矿渣浸出液中去除钒(V)和回收钒(V)的效率。V作为一种环境污染物，从渗滤液中去除V可能是铝土矿渣处理区（BRDA）长期管理要求的义务。从渗滤液中去除钒可以与回收相结合，并有可能用于抵消遗留场地的长期遗留处理成本。对吸附过程进行了动力学研究。吸附速率动力学符合准一级动力学模型，pH为11.5 （1.2 min−1）时吸附速率较高。吸附等温线数据更符合Freundlich方程而不是Langmuir模型。pH为13 （9.8 mg V g−1树脂）时吸附量最大（Langmuir值q max）。在柱式试验中，当赤泥渗滤液pH值为13时，在70层体积处实现了突破，而当出水pH值为11.5时，则没有实现突破。再生时，在pH为13和11.5的赤泥渗滤液中，用2 M NaOH分别洗脱树脂中42%和76%的V。需要进一步优化以提高处理效果。
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.
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影响因子：
11.4
作者：
Burke, Ian T.;Mayes, William M.;Gruiz, Katalin
通讯作者：
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影响因子：
15.1
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影响因子：
11.4
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影响因子：
2.9
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2.9
作者：
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通讯作者：
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