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Clean recycle and utilization of hazardous iron-bearing waste in iron ore sintering process

机译：铁矿石烧结过程中有害含铁废物的清洁回收利用

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摘要

Applying recycled iron-bearing waste materials (RIM) into iron ore sintering process is the general disposal approach worldwide, while its use is still a thorny problem. Results showed that adding RIM increased contents of hazardous elements (K, Na, Pb, Zn, and Cl) in sinter product, and also enhanced emission concentration of PM2.5 in flue gas; increasing reaction temperature, and contents of CaO & coke breeze in raw mixtures improved hazardous elements removal. Based on these features, a novel method through granulating natural iron ores and RIM separately and distributing granulated RIM in bottom sintering layers was proposed for clean RIM cycle. When recycling 5% RIM, granulating RIM separately with higher contents of CaO and coke breeze removed hazardous elements effectively, the contents of which in sinter were reduced to comparable level of the case without RIM. Moreover, distributing RIM in bottom sintering layer reached intensive release of hazardous elements and PM2.5 during sintering, which reduced the flue gas volume needing purification by about 2/3. Through activated carbon purification, about 60% of PM2.5 comprised high contents of hazardous elements was removed. Novel technique eliminated the negative impact of RIM and has the prospect to reach clean recycle in sinter-making plants.
机译：在世界范围内，将回收的含铁废料（RIM）应用于铁矿石烧结工艺是普遍的处置方法，尽管其使用仍然是一个棘手的问题。结果表明，添加RIM可以增加烧结产物中有害元素（K，Na，Pb，Zn和Cl）的含量，并提高烟道气中PM2.5的排放浓度。提高反应温度，原料混合物中CaO和焦炭微风的含量提高了有害元素的去除率。基于这些特征，提出了一种将天然铁矿石和RIM分别造粒，然后将RIM颗粒分布在底部烧结层中的新方法，以实现清洁RIM循环。循环使用5％RIM时，将具有较高CaO和焦炭微风含量的RIM分别制粒可有效去除有害元素，烧结矿中的有害元素含量可降低至没有RIM的情况。此外，在底部烧结层中分布RIM达到了烧结过程中有害元素和PM2.5的强烈释放，这使需要净化的烟气量减少了约2/3。通过活性炭净化，去除了约60％的高浓度有害元素PM2.5。新技术消除了RIM的负面影响，并有望在烧结厂中实现清洁回收。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2018年第5期|381-392|共12页
  • 作者

    Gan Min; Ji Zhiyun; Fan Xiaohui; Chen Xuling; Zhou Yang; Wang Guojing; Tian Ye; Jiang Tao;

  • 作者单位

    Cent S Univ, Sch Minerals Proc & Bioengn, 932,South Lushan Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, 932,South Lushan Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, 932,South Lushan Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, 932,South Lushan Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, 932,South Lushan Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, 932,South Lushan Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, 932,South Lushan Rd, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, 932,South Lushan 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

    Iron ore sintering; Iron-bearing waste; Hazardous elements; PM2.5; Clean recycle;

    机译：铁矿石烧结;含铁废物;有害元素;PM2.5;清洁回收;

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