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首页> 外文期刊>Environmental Technology >Direct reduction of copper slag-carbon composite pellets by coal and biochar
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Direct reduction of copper slag-carbon composite pellets by coal and biochar

机译：通过煤和生物炭直接减少铜渣 - 碳复合颗粒

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摘要

As a renewable resource of reducer, biochar prepared by pine sawdust is proposed for direct reduction of copper slag in this paper. Combined with thermodynamic analysis, effects of reduction time, temperature and CaO addition ratio on solid copper slag reduction characteristics are discussed. The oxides of iron in copper slag are Fe(3)O(4)and 2FeO center dot SiO2. The reduction processes were carried out step by step for Fe(3)O(4)and 2FeO center dot SiO2, respectively: Fe3O4 - FeO - Fe and 2FeO center dot SiO2 - Fe. The porous structure of biochar exhibits higher reduction reactivity and reaction rate than that of coal. CaO reduced the Gibbs free energy of reduction reactions and facilitated the reduction of 2FeO center dot SiO(2)with C and CO. When CaO was added, separation reaction of FeO and SiO(2)took place and alpha-SiO(2)and beta-SiO(2)were produced. When the addition ratio of CaO is above 0.3, CaO center dot SiO(2)and 2CaO center dot SiO(2)are produced. The reduction process of copper slag was established as follows: (a) dehydration and fast pyrolysis; (b) reduction of iron oxides by C and CO; and (c) sweating metallic iron outflows from cracks in pellet. Besides, direct reduction reaction mechanism and transport process of Cu are established based on reduction experiments, XRD and SEM-EDS analysis.
机译：作为减速器的可再生资源，提出了通过松木制备的生物炭，以直接减少本文的铜渣。结合热力学分析，讨论了降低时间，温度和CaO加法比固体铜渣减少特性的影响。铜渣中的铁的氧化物是Fe（3）O（4）和2Feo中心点SiO2。将还原过程逐步进行Fe（3）O（4）和2Feo中心点SiO2：Fe 3 O 4 - > FeO - > Fe和2Feo中心点SiO2 - > Fe。 Biochar的多孔结构表现出更高的反应性和反应速率比煤的更高。 Cao减少了吉布斯的减少反应能量，并促进了C和Co的2Feo中心点SiO（2）的减少。加入CaO时，FeO和SiO（2）的分离反应发生并α-SiO（2）和制作β-SiO（2）。当CaO的添加比率高于0.3时，产生CaO中心点SiO（2）和2caO中心点SiO（2）。铜渣的还原过程建立如下：（a）脱水和快速热解; （b）C和CO的氧化铁还原氧化物; （c）从颗粒中的裂缝中出汗的金属铁流出。此外，基于还原实验，XRD和SEM-EDS分析，建立直接还原反应机理和Cu的运输过程。

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  • 来源
    《Environmental Technology》 |2020年第20期|2240-2252|共13页
  • 作者

    Zuo Zongliang; Yu Qingbo; Xie Huaqing; Yang Fan; Han Zhicheng; Qin Qin;

  • 作者单位

    Northeastern Univ Sch Met POB 345 11 Lane 3 Wenhua Rd Shenyang Peoples R China;

    Northeastern Univ Sch Met POB 345 11 Lane 3 Wenhua Rd Shenyang Peoples R China;

    Northeastern Univ Sch Met POB 345 11 Lane 3 Wenhua Rd Shenyang Peoples R China;

    Northeastern Univ Sch Met POB 345 11 Lane 3 Wenhua Rd Shenyang Peoples R China;

    Northeastern Univ Sch Met POB 345 11 Lane 3 Wenhua Rd Shenyang Peoples R China;

    Northeastern Univ Sch Met POB 345 11 Lane 3 Wenhua Rd Shenyang Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);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

    Copper slag; direct reduction; composite pellet; thermodynamic analysis; biochar;

    机译：铜渣;直接减少;复合颗粒;热力学分析;生物炭;

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