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过程工程学报 ›› 2021, Vol. 21 ›› Issue (10): 1187-1195.DOI: 10.12034/j.issn.1009-606X.220327

• 过程与工艺 • 上一篇    下一篇

废阴极炭碳热还原法贫化艾萨铜熔炼渣

吴国东1， 李磊2*， 李孔斋1， 于勇1   

  1. 1. 昆明理工大学冶金节能减排教育部工程研究中心，云南 昆明 650093

    2. 昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室，云南 昆明 650093

  • 收稿日期:2020-10-10 修回日期:2020-12-01 出版日期:2021-10-28 发布日期:2021-10-26
  • 通讯作者: 李磊 tianxiametal1008@163.com
  • 基金资助:
    国家自然科学基金联合基金重点项目

Dilution of Isa copper smelting slag by carbothermic reduction with waste cathode carbon

Guodong WU1,  Lei LI2*,  Kongzhai LI1,  Yong YU1   

  1. 1. Engineering Research Center of Metallurgical Energy Conservation & Emission Reduction, Ministry of Educaiton, Kunming University of Science and Technology, Kunming, Yunnan 650093, China

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

  • Received:2020-10-10 Revised:2020-12-01 Online:2021-10-28 Published:2021-10-26
  • Contact: LI Lei tianxiametal1008@163.com

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摘要： 以电解铝工艺所产生废阴极炭块为还原剂，可实现艾萨铜熔炼渣中铜的有效火法贫化回收。结合热力学分析，研究了废阴极炭加入量、还原温度、保温时间和CaO添加量对艾萨铜渣中铜贫化回收的影响规律。结果表明，废阴极炭添加量2.0%、还原温度1300℃和保温时间60 min条件下，铜贫化回收率可达98.24%。废阴极炭中F可转移并以CaF2形式固定在贫化尾渣中，尾渣中F?和CN?的毒性浸出浓度远低于国家允许排放标准，实现了艾萨铜熔炼渣铜的高效贫化回收和废阴极炭的资源化利用。

关键词: 艾萨铜渣, 废阴极炭, 贫化, 氟

Abstract: Massive waste cathode carbon block are produced from the electrolytic aluminum process each year, which is mainly composed of carbon, sodium fluoride and other compounds. The fluoride and cyanide components in it cause serious environment pollution if it accumulated and exposed to air for a long time. It is regarded as a hazardous waste by various environmental bodies. An innovative method for resource processing of this waste cathode carbon block was proposed in this work. Using this waste cathode carbon block as the reducing agent can realize the effective dilution and recovery of copper from the smelting slag of Isa copper through a reduction process. According to thermodynamic analysis, the influence of the amount of waste cathode carbon addition, reduction temperature, holding time and CaO addition on the recovery ratio of copper dilution in Isa copper smelting slag was studied. The results showed that the recovery ratio of copper dilution can reach 98.24% under the conditions of waste cathode carbon addition amount of 2.0%, reduction temperature of 1300℃ and holding time of 60 min. At the same time, the F in the waste cathode carbon can be transferred and fixed in the diluted tailings in the form of CaF2. The toxic leaching concentrations of F? and CN? in the tailings were far lower than the national permissible emission standard. The research has realized the high-efficiency recovery of copper from Isa copper smelting slag and the resource utilization of waste cathode carbon.

Key words: Isa smelting slag, waste cathode carbon, pyro-dilution, fluorine