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首页> 外文期刊>Journal of Hazardous Materials >Arsenic removal from copper slag matrix by high temperature sulfide-reduction-volatilization
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Arsenic removal from copper slag matrix by high temperature sulfide-reduction-volatilization

机译：通过高温硫化物还原 - 挥发从铜渣基质中除去砷

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摘要

Arsenic contamination has been a major problem in copper slag utilization. Arsenic is easily incorporated into the silicate-based matrix, making the arsenic difficult to volatilize. In this study, pyrite was selected to depolymerize the matrix structure and volatilize the glassy arsenic by sulfide-reduction-volatilization reaction. The optimum technological parameters and mechanism of glassy arsenic volatilization by pyrite were further studied. The optimum operating parameters for glassy arsenic volatilization by pyrite were determined to be a temperature of 1200 degrees C, a holding time of 60 min, a heating rate of 5 degrees C/min, a basicity of 0.3, and a pyrite addition content of 15%. The arsenic volatilization ratio reached 80.9% under these experimental conditions. Besides, the mechanism of glassy arsenic volatilization was elucidated by XRD, XPS, FTIR, and SEM analyses. These results indicate that, with the increase in temperature, the pyrite decomposes to generate a variety of sulfur-based reducing substances (FeS, FeS1-x, S-2(g)). Through "oxygen capture reaction", these sulfur-based reducing substances depolymerize the bridging oxygen structure from the glass former ([AsO4], [FeO4], and [SiO4]) by the conversion of (Q(2)+Q(3))-(Q(0)+Q(1)) and result in the precipitation of glass former ([AsO4], [FeO4] and [SiO4]) combining with the nearby cation. In this process, the glassy arsenic is released by the glass network and participates in reductive volatilization reaction with sulfur-based reducing substances, converting the glassy arsenic with high thermal stability to volatile arsenic oxide and arsenic sulfide. These findings provide a theoretical support for the in situ volatilization of arsenic in copper smelting and centralized control of arsenic contamination.
机译：砷污染是铜渣利用的主要问题。砷易于掺入硅酸盐基质中，使砷难以挥发。在该研究中，选择吡钛矿以解聚基质结构并通过硫化物还原挥发反应使玻璃砷挥发。进一步研究了黄铁矿玻璃砷挥发的最佳技术参数和机制。通过黄铁矿的玻璃砷挥发的最佳操作参数被确定为1200℃的温度，保持时间为60分钟，加热速率为5℃/ min，碱度为0.3，硫铁矿加成含量为15 ％。在这些实验条件下，砷挥发率达到80.9％。此外，通过XRD，XPS，FTIR和SEM分析阐明了玻璃砷挥发的机制。这些结果表明，随着温度的增加，硫铁矿分解以产生各种基于硫的还原物质（FES，FES1-X，S-2（G））。通过“氧气捕获反应”，通过（Q（2）+ Q（3）的转化，将这些硫基的还原物质通过转化率从玻璃剂（π，η，η，[siO4]）中解聚。（q（2）+ q（3） ） - ＆（Q（0）+ Q（1））并导致与附近阳离子相结合的玻璃前（τ，η，[SiO4]）的沉淀。在该方法中，玻璃网络释放玻璃状砷，并参与与基于硫的还原物质的还原挥发反应，将玻璃状砷与挥发性砷氧化物和砷硫化物一起转化为高热稳定性。这些发现提供了对砷的原位挥发在铜冶炼和集中控制的砷污染的理论支持。

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  • 来源
    《Journal of Hazardous Materials》 |2021年第5期|125642.1-125642.12|共12页
  • 作者

    Zhao Zongwen; Wang Zhongbing; Xu Wenbin; Qin Weining; Lei Jie; Dong Zhunqin; Liang Yanjie;

  • 作者单位

    Cent South Univ Sch Met & Environm Changsha 410083 Hunan Peoples R China|Cent South Univ Postdoctoral Mobile Stn Changsha 410083 Hunan Peoples R China|Dongjiang Environm Co Ltd Shenzhen 518057 Guangdong Peoples R China;

    Cent South Univ Sch Met & Environm Changsha 410083 Hunan Peoples R China|Cent South Univ Postdoctoral Mobile Stn Changsha 410083 Hunan Peoples R China|Dongjiang Environm Co Ltd Shenzhen 518057 Guangdong Peoples R China;

    Dongjiang Environm Co Ltd Shenzhen 518057 Guangdong Peoples R China;

    Dongjiang Environm Co Ltd Shenzhen 518057 Guangdong Peoples R China;

    Green Ecomanufacture Co Ltd Shenzhen 518101 Guangdong Peoples R China;

    Shandong Humon Smelting Co Ltd Yantai 264109 Peoples R China;

    Cent South Univ Sch Met & Environm Changsha 410083 Hunan Peoples R China|Chinese Natl Engn Res Ctr Control & Treatment Hea 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

    Glassy arsenic; Pyrite; Sulfur-based reducing substances; Volatilization;

    机译：玻璃砷;黄铁矿;硫基降低物质;挥发;

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