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Acid Mine Drainage Treatment Using Bayer Precipitates Obtained from Seawater Neutralization of Bayer Liquor

机译:使用拜耳酒中和后的拜耳沉淀物处理酸性矿山废水

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摘要

Bayer precipitates from the seawater neutralization of Bayer liquor waste from the alumina industry are shown to be a prospective solution for the remediation of acid mine drainage (AMD) water. Precipitates are varied in composition, albeit they are generally comprised of hydrotalcite (Mg6Al2(OH)16CO3∙xH2O), calcite (CaCO3), aragonite (CaCO3), mixed metal hydroxides (Mg2Al(OH)7), and halite (NaCl). Brucite (Mg(OH)2) is detected for lower Bayer liquor concentrations (1–3 g L−1 Al2O3) when the concentrations of aluminum and hydroxyl species are insufficient to promote hydrotalcite formation. The neutralizing capacity of the precipitates also varies with Bayer liquor composition. Treatment of AMD water with Bayer precipitates met discharge pH guidelines. The dissolution of hydrotalcite and brucite (1–3 g L−1 Bayer precipitates only) is responsible for the Bayer precipitate's neutralizing capacity, while calcium carbonate has a buffering affect at around pH 7. Manganese ions are the most challenging species to remove because high pH values are required (pH > 9), which is not possible with all precipitates tested. One caveat is that increasing the degree of manganese removal generates issues with excessive dissolved aluminum which exceeds discharge limits. Future research should address this latter problem and facilitate implementation of this approach to AMD remediation.
机译:氧化铝工业中的拜耳废液的海水中和产生的拜耳沉淀物被证明是补救酸性矿山排水(AMD)水的潜在解决方案。沉淀物的组成有所不同,尽管它们通常由水滑石(Mg6Al2(OH)16CO3∙xH2O),方解石(CaCO3),文石(CaCO3),混合金属氢氧化物(Mg2Al(OH)7)和盐石(NaCl)组成。当铝和羟基物质的浓度不足以促进水滑石形成时,会检测到较低的拜耳液浓度(1-3 g L -1 Al2O3)中的水镁石(Mg(OH)2)。沉淀物的中和能力也随拜耳液体组成而变化。用拜耳沉淀物处理AMD水符合排放pH准则。水滑石和水镁石的溶解(仅1-3 g L −1 Bayer沉淀物)负责Bayer沉淀物的中和能力,而碳酸钙在pH约为7时具有缓冲作用。由于需要高pH值(pH> 9),因此需要去除大多数具有挑战性的物质,这对于所有测试的沉淀物都是不可能的。一个警告是,增加锰的去除程度会产生过量的溶解铝而导致超出排放极限的问题。未来的研究应解决后一个问题,并促进该方法对AMD修复的实施。

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