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Iron and copper recovery from copper slags through smelting with waste cathode carbon from aluminium electrolysis

以铝电解废阴极炭为添加剂熔融还原回收铜渣中的铜和铁

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Abstract

To recover metal from copper slags, a new process involving two steps of oxidative desulfurization followed by smelting reduction was proposed in which one hazardous waste (waste cathode carbon) was used to treat another (copper slags). The waste cathode carbon is used not only as a reducing agent but also as a fluxing agent to decrease slag melting point. Upon holding for 60 min in air atmosphere first and then smelting with 14.4 wt% waste cathode carbon and 25 wt% CaO for 180 min in high purity Ar atmosphere at 1450 °C, the recovery rates of Cu and Fe reach 95.89% and 94.64%, respectively, and meanwhile greater than 90% of the fluoride from waste cathode carbon is transferred into the final slag as CaF2 and Ca2Si2F2O7, which makes the content of soluble F in the slag meet the national emission standard. Besides, the sulphur content in the obtained Fe-Cu alloy is low to 0.03 wt%.

摘要

为了回收铜渣中的铜和铁,本文提出了一种铜渣氧化脱硫-废阴极碳熔融还原两步处理新工艺,在熔融还原过程中,废阴极碳不仅可作为还原剂,同时也可作为助熔剂降低熔渣熔点。在 1450 °C 时,铜渣在空气气氛中保温 60 min 后,添加 14.4 wt%的废阴极碳和 25 wt%的 CaO 至铜熔渣中并在高纯Ar 气氛下进行熔融还原 180 min,Cu 和 Fe 的回收率分别可以达到 95.89%和 94.64%。同时,废阴极碳中 90%以上的氟化物以 CaF2 和 Ca2Si2F2O7 形式转移至尾渣中,炉渣中可溶性 F 含量达到国家排放标准。此外,所得 Fe-Cu 合金中硫含量低至0.03 wt%。

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Funding

Project(U1602272) supported by the National Natural Science Foundation of China

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Authors and Affiliations

  1. State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, China

    Kai-xuan Mao  (毛凯旋), Lei Li  (李磊) & Miao Xu  (徐苗)

  2. Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction of Ministry of Education, Kunming University of Science and Technology, Kunming, 650093, China

    Kai-xuan Mao  (毛凯旋), Lei Li  (李磊) & Miao Xu  (徐苗)

  3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Kai-xuan Mao  (毛凯旋), Lei Li  (李磊) & Miao Xu  (徐苗)

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  1. Kai-xuan Mao  (毛凯旋)
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  2. Lei Li  (李磊)
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  3. Miao Xu  (徐苗)
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Contributions

MAO Kai-xuan performed the data analyses and wrote the manuscript, LI Lei performed the analysis with constructive discussions and contributed significantly to manuscript preparation, XU Miao contributed to the validation of this study.

Corresponding author

Correspondence to Lei Li  (李磊).

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Conflict of interest

MAO Kai-xuan, LI Lei and XU Miao declare that they have no conflict of interest.

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Mao, Kx., Li, L. & Xu, M. Iron and copper recovery from copper slags through smelting with waste cathode carbon from aluminium electrolysis. J. Cent. South Univ. 28, 2010–2021 (2021). https://doi.org/10.1007/s11771-021-4749-z

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  • DOI: https://doi.org/10.1007/s11771-021-4749-z

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