Comparisons between magnetic separation and gas smelting separation process to treat copper slag by rotary hearth furnace direct reduction

被引：3
|
作者：
Cao Z. [1 ,2 ]
Sun T. [1 ]
Xue X. [1 ,2 ]
Liu Z. [1 ,2 ]
机构：
[1] Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing
[2] Shenwu Technology Group Corp., Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2017年 / 48卷 / 10期
关键词：
Copper slag; Energy consumption; Gas smelting; Magnetic separation; Rotary hearth furnace;
D O I：
10.11817/j.issn.1672-7207.2017.10.002
中图分类号：
学科分类号：
摘要：
Taking a domestic copper slag as the subject, comparison between the rotary hearth furnace direct reduction process followed by a magnetic separation process and the same rotary hearth furnace direct reduction process followed by a gas smelting process, were investigated. Firstly, the optimum reaction parameters were determined by basic tests, based on which the pilot plant scale tests were conducted to reveal the direct reduction mechanism of the copper slag in the rotary hearth furnace direct reduction process. Finally, computation and comparison analysis of energy consumption of both processes were carried out. The results show that after direct reduction in the rotary hearth furnace, fayalite (Fe2SiO4) and magnetite (Fe3O4) in the copper slag are phased-changed into iron (Fe), quartz (SiO2) and trace amounts of augite (Ca(Fe, Mg)Si2O6) in the metallized pellets. The reduced iron grains aggregate and grow into iron chain crystals, which is the precondition for further iron enrichment either in the magnetic separation or smelting process. After the metallized pellets go through the magnetic separation process, iron powder with an iron content of 91.12% and an iron recovery rate of 86.36% is obtained, while hot metal with an iron content of 94.93% and an iron recovery rate of 97.52% is obtained after the metallized pellets go through the gas smelting process. Energy consumption per ton of product of the rotary hearth furnace direct reduction-gas smelting process is about 30% higher than that of the rotary hearth furnace direct reduction-magnetic separation process. © 2017, Central South University Press. All right reserved.
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页码：2565 / 2571
页数：6
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