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首页> 外文期刊>Environmental Science & Technology >Mechanism of Vanadium Leaching during Surface Weathering of Basic Oxygen Furnace Steel Slag Blocks: A Microfocus X-ray Absorption Spectroscopy and Electron Microscopy Study
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Mechanism of Vanadium Leaching during Surface Weathering of Basic Oxygen Furnace Steel Slag Blocks: A Microfocus X-ray Absorption Spectroscopy and Electron Microscopy Study

机译：碱性氧气炉钢渣块表面风化过程中钒的浸出机理：微聚焦X射线吸收光谱和电子显微镜研究

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摘要

Basic oxygen furnace (BOF) steelmaking slag is enriched in potentially toxic V which may become mobilized in high pH leachate during weathering. BOF slag was weathered under aerated and air-excluded conditions for 6 months prior to SEM/EDS and μXANES analysis to determine V host phases and speciation in both primary and secondary phases. Leached blocks show development of an altered region in which free lime and dicalcium silicate phases were absent and Ca-Si-H was precipitated (CaCO_3 was also present under aerated conditions). μXANES analyses show that V was released to solution as V(V) during dicalcium silicate dissolution and some V was incorporated into neo-formed Ca-Si-H. Higher V concentrations were observed in leachate under aerated conditions than in the air-excluded leaching experiment. Aqueous V concentrations were controlled by Ca_3(VO_4)_2 solubility, which demonstrate an inverse relationship between Ca and V concentrations. Under air-excluded conditions Ca concentrations were controlled by dicalcium silicate dissolution and Ca-Si-H precipitation, leading to relatively high Ca and correspondingly low V concentrations. Formation of CaCO_3 under aerated conditions provided a sink for aqueous Ca, allowing higher V concentrations limited by kinetic dissolution rates of dicalcium silicate. Thus, V release may be slowed by the precipitation of secondary phases in the altered region, improving the prospects for slag reuse.
机译：碱性氧气炉（BOF）炼钢炉渣富含潜在的有毒V，其在风化过程中可能在高pH渗滤液中动员。在进行SEM / EDS和μXANES分析之前，将BOF炉渣在曝气和空气排除条件下风化6个月，以确定初级和次级相中的V宿主相和形态。浸出的块显示出变化区域的发展，其中没有游离石灰和硅酸二钙相，并且沉淀了Ca-Si-H（在充气条件下也存在CaCO_3）。 μXANES分析表明，在硅酸二钙溶解过程中，V以V（V）的形式释放到溶液中，并且某些V掺入了新形成的Ca-Si-H中。在曝气条件下，渗滤液中的V浓​​度要高于空气排除浸出实验中的V浓度。水溶液中的V浓​​度受Ca_3（VO_4）_2溶解度的控制，这表明Ca和V浓度之间存在反比关系。在空气排除的条件下，钙的浓度通过硅酸二钙的溶解和Ca-Si-H的沉淀来控制，从而导致较高的Ca和相应较低的V浓度。在充气条件下形成CaCO_3提供了Ca水溶液的吸收池，允许较高的V浓度受到硅酸二钙动力学溶解速率的限制。因此，改变区域中的第二相的沉淀可能会减缓钒的释放，从而改善了炉渣再利用的前景。

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  • 来源
    《Environmental Science & Technology》 |2017年第14期|7823-7830|共8页
  • 作者

    Hobson Andrew J.; Stewart Douglas I.; Bray Andrew W.; Mortimer Robert J.G.; Mayes William M.; Rogerson Mike R.; Burke Ian T.;

  • 作者单位

    School of Earth and Environment, University of Leeds, Leeds, United Kingdom;

    School of Civil Engineering, University of Leeds, Leeds, United Kingdom;

    School of Earth and Environment, University of Leeds, Leeds, United Kingdom;

    School of Animal, Rural and Environmental Sciences, Nottingham Trent University, Brackenhurst Campus, Southwell, Nottinghamshire, United Kingdom;

    School of Environmental Sciences, University of Hull, Hull, United Kingdom;

    School of Environmental Sciences, University of Hull, Hull, United Kingdom;

    School of Earth and Environment, University of Leeds, Leeds, United Kingdom;

  • 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);
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