Enhancement of bauxite residue as a low-cost adsorbent for phosphorus in aqueous solution, using seawater and gypsum treatments
Enhancement of bauxite residue as a low-cost adsorbent for phosphorus in aqueous solution, using seawater and gypsum treatments
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DOI：
10.1016/j.jclepro.2018.01.092
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发表时间：
2018-04-01
影响因子：
11.1
通讯作者：
Courtney, Ronan
中科院分区：
文献类型：
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作者：
Cusack, Patricia B.;Healy, Mark G.;Courtney, Ronan
铝土矿残渣（红泥）是氧化铝工业中产生的副产品，其全球产量估计约为每年1.5亿吨。由于铝土矿残渣具有高碱性，许多炼油厂使用中和技术，如泥浆养殖（大气碳酸化）、使用二氧化碳直接碳酸化或与海水反应，以处理铝土矿残渣，并在将其处置到布尔达（铝土矿残渣处置区）之前降低其碱度。应用处理可以使铝土矿残渣无害，并且还可以制备铝土矿残渣用于再利用，特别是作为吸附剂。在这项研究中，石膏和海水处理施加到各种铝土矿渣样品获得和其矿物，元素和物理化学性质的影响，以及其对磷（P）的吸附容量的影响进行了研究。结果发现，除了降低碱度的所有铝土矿渣样品使用，磷吸附容量也增强后，修改与海水或石膏，特别是与石膏。磷吸附量与Ca、CaO均呈正相关。磷吸附量与介质pH呈负相关。将批处理吸附实验获得的数据拟合至Langmuir吸附等温线，估计最大吸附容量范围为0.345至2.73 mg P/g铝土矿残渣，突出了铝土矿残渣作为P吸附剂的再利用潜力。（C）2018 Elsevier Ltd.版权所有。
Bauxite residue (red mud), the by-product produced in the alumina industry, is being produced at art estimated global rate of approximately 150 Mt per annum. Due to its highly alkaline nature, many refineries use neutralisation techniques such as mud farming (atmospheric carbonation), direct carbonation using carbon dioxide or reactions with seawater, to treat the bauxite residue and reduce its alkalinity prior to disposal in the BRDA (bauxite residue disposal area). Applying a treatment can render the bauxite residue non-hazardous and may also prepare the bauxite residue for reuse, particularly as an adsorbent. In this study, gypsum and seawater treatments were applied to the various bauxite residue samples obtained and the effects on its mineral, elemental and physiochemical properties were examined, as well as the effect on its phosphorus (P) adsorption capacity. It was found that in addition to reducing the alkalinity of all bauxite residue samples used, the P adsorption capacity was also enhanced following amendment with seawater or gypsum, particularly with gypsum. A positive correlation was detected between P adsorption and both Ca and CaO. A negative correlation was detected between the P adsorption and pH of the media. Fitting the data obtained from a batch adsorption experiment to the Langmuir adsorption isotherm, the maximum adsorption capacity was estimated to range from 0.345 to 2.73 mg P per g bauxite residue, highlighting the re-use potential for bauxite residue as an adsorbent for P. (C) 2018 Elsevier Ltd. All rights reserved.