Study on Low-Temperature Vacuum Carbothermal Reduction of High-arsenic Copper Dust in Copper Fire Refining Furnace for Arsenic Removal

Li Cong; Zhang Rongliang; Zeng Jia; Lu Qinyao; Zhou Linkai; Zhang Wei

doi:10.3969/j.issn.1000-6532.2022.06.028

2022 No. 6

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Article navigation > Multipurpose Utilization of Mineral Resources > 2022 > 43(6): 167-173

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Li Cong, Zhang Rongliang, Zeng Jia, Lu Qinyao, Zhou Linkai, Zhang Wei. Study on Low-Temperature Vacuum Carbothermal Reduction of High-arsenic Copper Dust in Copper Fire Refining Furnace for Arsenic Removal[J]. Multipurpose Utilization of Mineral Resources, 2022, 43(6): 167-173. doi: 10.3969/j.issn.1000-6532.2022.06.028

Citation:

Li Cong, Zhang Rongliang, Zeng Jia, Lu Qinyao, Zhou Linkai, Zhang Wei. Study on Low-Temperature Vacuum Carbothermal Reduction of High-arsenic Copper Dust in Copper Fire Refining Furnace for Arsenic Removal[J]. Multipurpose Utilization of Mineral Resources, 2022, 43(6): 167-173. doi: 10.3969/j.issn.1000-6532.2022.06.028

Study on Low-Temperature Vacuum Carbothermal Reduction of High-arsenic Copper Dust in Copper Fire Refining Furnace for Arsenic Removal

School of Metallurgy and Materials Engineering, Zhangjiagang Campus, Jiangsu University of Science and Technology, Zhangjiagang, Jiangsu, China

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Corresponding author: Zhang Rongliang, zhangrljx19201@163.com

Received Date: 28 December 2020

Publish Date: 25 December 2022

Abstract

Abstract

Using the high arsenic copper dust from the copper fire refining furnace as the raw material, the low-temperature vacuum carbothermic reduction method is used to remove As from the dust. Differential thermal analysis of the raw materials was carried out by TGA-DSC, and the phase, chemical composition and morphology of the dust and evaporation residue were analyzed by XRD, ICP, SEM and other analytical methods. On the basis of thermodynamic analysis, the effect of evaporation temperature, residual pressure, reducing dose, evaporation time, etc. on the removal rate of As and other valuable metals. The results show that when the evaporation temperature is 350℃, the residual pressure is 100 Pa, the reducing amount is 25%, and the evaporation time is 50 min, the removal rate of As can reach 81.63% while ensuring that other metals do not evaporate basically, realizing As Selective separation of other valuable metals. The evaporate is As₂O₃ with higher purity, which can be used as primary As₂O₃ product. Valuable metals are enriched in the evaporation residue, which is convenient for the subsequent recovery of the waste acid leaching process.
- Pyro-refining furnace /
- High-arsenic copper dust /
- Vacuum carbothermal reduction /
- Arsenic removal

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References

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