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首页> 外文期刊>Environmental Science & Technology >Speciation of Zn in Blast Furnace Sludge from Former Sedimentation Ponds Using Synchrotron X-ray Diffraction, Fluorescence, and Absorption Spectroscopy
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Speciation of Zn in Blast Furnace Sludge from Former Sedimentation Ponds Using Synchrotron X-ray Diffraction, Fluorescence, and Absorption Spectroscopy

机译：同步加速器X射线衍射，荧光和吸收光谱法分析前沉淀池高炉污泥中的锌形态

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摘要

Blast furnace sludge (BFS), an industrial waste generated in pig iron production, typically contains high contents of iron and various trace metals of environmental concern, including Zn, Pb, and Cd. The chemical speciation of these metals in BFS is largely unknown. Here, we used a combination of synchrotron X-ray diffraction, micro-X-ray fluorescence, and X-ray absorption spectroscopy at the Zn K-edge for solid-phase Zn speciation in 12 BFS samples collected on a former BFS sedimentation pond site. Additionally, one fresh BFS was analyzed for comparison. We identified five major types of Zn species in the BFS, which occurred in variable amounts: (1) Zn in the octahedral sheets of phyllosilicates, (2) Zn sulfide minerals (ZnS, sphalerite, or wurtzite), (3) Zn in a KZn-ferrocyanide phase (K_2Zn_3[Fe-(CN)_6]_2-9H_2O), (4) hydrozincite (Zn_s(OH)_6(CO_3)_2), and (5) tetrahedralry coordinated adsorbed Zn. The minerals franklinite (ZnFe_2O_4) and smithsonite (ZnCO_3) were not detected, and zincite (ZnO) was detected only in traces. The contents of ZnS were positively correlated with the total S contents of the BFS. Similarly, the abundance of the KZn-ferrocyanide phase was closely correlated with the total CN contents, with the stoichiometry suggesting this as the main cyanide phase. This study provides the first quantitative Zn speciation in BFS deposits, which is of great relevance for environmental risk assessment, the development of new methods for recovering Zn and Fe from BFS, and potential applications of BFS as sorbent materials in wastewater treatment.
机译：高炉污泥（BFS）是生铁生产中产生的一种工业废物，通常含有高含量的铁和各种与环境有关的微量金属，包括Zn，Pb和Cd。这些金属在BFS中的化学形态在很大程度上尚不清楚。在这里，我们使用了同步加速器X射线衍射，微X射线荧光和X射线吸收光谱技术在Zn K边缘进行固相锌形态分析，以收集在以前BFS沉淀池现场收集的12个BFS样品。另外，分析了一种新鲜的BFS进行比较。我们在BFS中确定了五种主要的Zn类型，它们以不同的量出现：（1）层状硅酸盐的八面体薄片中的Zn，（2）硫化锌矿物（ZnS，闪锌矿或纤锌矿），（3） KZn-亚铁氰化物相（K_2Zn_3 [Fe-（CN）_6] _2-9H_2O），（4）氢锌酸盐（Zn_s（OH）_6（CO_3）_2）和（5）四面体配位吸附的Zn。未检出富兰克林石矿（ZnFe_2O_4）和铁矿石（ZnCO_3），仅痕量检出了锌矿（ZnO）。 ZnS的含量与BFS的总S含量呈正相关。同样，KZn-亚铁氰化物相的丰度与总CN含量密切相关，化学计量表明这是主要的氰化物相。这项研究提供了BFS矿床中第一个定量的Zn形态，这对环境风险评估，从BFS中回收锌和铁的新方法的开发以及BFS作为吸附剂在废水处理中的潜在应用具有重大意义。

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  • 来源
    《Environmental Science & Technology》 |2012年第22期|12381-12390|共10页
  • 作者

    Ruben Kretzschmar; Tim Mansfeldt; Petar N. Mandaliev; Kurt Barmettler; Matthew A Marcus; Andreas Voegelin;

  • 作者单位

    Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, CHN, 8092 Zurich, Switzerland;

    Soil Geography/Soil Science, Department of Geosciences, University of Cologne, Albertus-Magnus-Platz, D-50923 Koln, Germany;

    Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, CHN, 8092 Zurich, Switzerland;

    Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, CHN, 8092 Zurich, Switzerland;

    Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States;

    Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, CHN, 8092 Zurich, Switzerland,Eawag, Swiss Federal Institute of Aquatic Science and Technology, UEberlandstrasse 133, CH-8600 Duebendorf, Switzerland;

  • 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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