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首页> 外文期刊>Journal of Hazardous Materials >Acid transformation of bauxite residue: Conversion of its alkaline characteristics
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Acid transformation of bauxite residue: Conversion of its alkaline characteristics

机译：铝土矿渣的酸转化：其碱性特征的转化

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摘要

Bauxite residue (BR) is a highly alkaline solid hazardous waste produced from bauxite processing for alumina production. Alkaline transformation appears to reduce the environmental risk of bauxite residue disposal areas (BRDAs) whilst potentially providing opportunities for the sustainable reuse and on-going management of BR. Mineral acids, a novel citric acid and a hybrid combination of acid-gypsum treatments were investigated for their potential to reduce residue pH and total alkalinity and transform the alkaline mineral phase. XRD results revealed that with the exception of andradite, the primary alkaline solid phases of cancrinite, grossular and calcite were transformed into discriminative products based on the transformation used. Supernatants separated from BR and transformed bauxite residue (TBR) displayed distinct changes in soluble Na, Ca and Al, and a reduction in pH and total alkalinity. SEM images suggest that mineral acid transformations promote macro-aggregate formation, and the positive promotion of citric acid, confirming the removal or reduction in soluble and exchangeable Na. NEXAFS analysis of Na K-edge revealed that the chemical speciation of Na in TBRs was consistent with BR. Three acid treatments and gypsum combination had no effect on Na speciation, which affects the distribution of Na revealed by sodium STXM imaging. (C) 2016 Elsevier B.V. All rights reserved.
机译：铝土矿残留物（BR）是铝土矿加工过程中产生的高碱性固体有害废物，用于氧化铝生产。碱转化似乎降低了铝土矿渣处置区（BRDA）的环境风险，同时潜在地为BR的可持续再利用和持续管理提供了机会。研究了无机酸，新型柠檬酸和酸石膏处理的混合组合，它们具有降低残留pH和总碱度并转化碱性矿物相的潜力。 X射线衍射结果表明，除了andradit之外，基于所使用的转化，将Cancrinite，grosular和方解石的主要碱性固相转化为可鉴别的产物。从BR​​和转化的铝土矿残留物（TBR）分离的上清液在可溶性Na，Ca和Al中显示出明显的变化，并且pH和总碱度降低。 SEM图像表明，无机酸的转化促进了宏观聚集体的形成，并促进了柠檬酸的产生，从而证实了可溶性和可交换Na的去除或减少。 NEXAFS对Na K边缘的分析表明，TBR中Na的化学形态与BR一致。三种酸处理和石膏组合对Na的形态没有影响，这影响了STXM钠显像所揭示的Na的分布。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2017年第ptab期|382-390|共9页
  • 作者

    Kong Xiangfeng; Li Meng; Xue Shengguo; Hartley William; Chen Chengrong; Wu Chuan; Li Xiaofei; Li Yiwei;

  • 作者单位

    Cent S Univ, Sch Met & Environm, 932 Lushan South Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Met & Environm, 932 Lushan South Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Met & Environm, 932 Lushan South Rd, Changsha 410083, Hunan, Peoples R China;

    Harper Adams Univ, Crop & Environm Sci Dept, Newport TF10 8NB, Shrops, England;

    Griffith Univ, Griffith Sch Environm, Nathan Campus, Nathan, Qld 4111, Australia;

    Cent S Univ, Sch Met & Environm, 932 Lushan South Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Met & Environm, 932 Lushan South Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Met & Environm, 932 Lushan South Rd, Changsha 410083, Hunan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bauxite residue; Alkaline transformation; Organic acid; Gypsum combination; NEXAFS analysis;

    机译：铝土矿渣;碱转化;有机酸;石膏组合;NEXAFS分析;

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