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Recovery of Iron from Flotation Tailings of Copper Smelting Slag by Leaching－Magnetic Separation
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Wei WANG1, 2, 3, 4, Ke WANG1, 2, 3, 4, Hongzhao LIU1, 2, 3, 4, Lin LIU1, 2, 3, 4, Yongkang ZHANG1, 2, 3, 4, Yaohua CAO1, 2, 3, 4, Yudong LIANG1, 2, 3, 4, Hongliang WANG1, 2, 3, 4
Hydrometallurgy of China | 2026, 45(3) : 416 - 422
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Hydrometallurgy of China | 2026, 45(3): 416-422
• Experiment Research •
Recovery of Iron from Flotation Tailings of Copper Smelting Slag by Leaching－Magnetic Separation
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Wei WANG1, 2, 3, 4, Ke WANG1, 2, 3, 4, Hongzhao LIU1, 2, 3, 4, Lin LIU1, 2, 3, 4, Yongkang ZHANG1, 2, 3, 4, Yaohua CAO1, 2, 3, 4, Yudong LIANG1, 2, 3, 4, Hongliang WANG1, 2, 3, 4
Affiliations
  • 1.Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Zhengzhou　450006, China
  • 2.China National Engineering Research Center for Utilization of Industrial Minerals, Zhengzhou　450006, China
  • 3.Key Laboratory for Polymetallic Ores' Evaluation and Utilization, MNR, Zhengzhou　450006, China
  • 4.Comprehensive Utilization Key Laboratory of Gold and Copper Resources in Henan Province, Zhengzhou　450006, China
Published: 2026-06-20 doi: 10.13355/j.cnki.sfyj.2026.03.017
Outline
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The iron content in flotation tailings of copper smelting slag is high, which has further comprehensive recycling value. Based on the difference of decomposition performance of fayalite and magnetite minerals in copper tailings in acidic solution, the recovery of iron from copper smelting tailings by sulfuric acid leaching－magnetic separation process was studied. The effects of various factors on iron recovery were investigated, and the optimal leaching and magnetic separation conditions were determined. The results show that under the optimized acid leaching conditions of sulfuric acid concentration of 0.2 mol/L, liquid volume to solid mass ratio of 4∶1, leaching temperature of 40 ℃ and leaching time of 60 min, the total iron mass fraction in the leaching residue is 52.57%, and the iron recovery rate is 95.17%. The optimum magnetic separation conditions are as follows: grinding particle size 28 μm accounts for 90%, magnetic separation field strength 140 kA/m. Under the conditions, the total iron grade of iron concentrate is 59.25%, and the iron recovery rate is 85.70%. The process has good economic feasibility and can provide reference for the resource utilization of iron in flotation tailings of copper smelting slag.

flotation tailings of copper smelting slag  /  acid leaching  /  magnetic separation  /  iron concentrate  /  comprehensive recycling
Wei WANG, Ke WANG, Hongzhao LIU, Lin LIU, Yongkang ZHANG, Yaohua CAO, Yudong LIANG, Hongliang WANG. Recovery of Iron from Flotation Tailings of Copper Smelting Slag by Leaching－Magnetic Separation[J]. Hydrometallurgy of China, 2026 , 45 (3) : 416 -422 . DOI: 10.13355/j.cnki.sfyj.2026.03.017
Appendix
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Year 2026 volume 45 Issue 3
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Article Info
doi: 10.13355/j.cnki.sfyj.2026.03.017
  • Receive Date：2026-01-04
  • Online Date：2026-09-11
  • Published：2026-06-20
Article Data
Affiliations
History
  • Received：2026-01-04
  • Revised：2026-03-01
Funding
Affiliations
    1.Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Zhengzhou　450006, China
    2.China National Engineering Research Center for Utilization of Industrial Minerals, Zhengzhou　450006, China
    3.Key Laboratory for Polymetallic Ores' Evaluation and Utilization, MNR, Zhengzhou　450006, China
    4.Comprehensive Utilization Key Laboratory of Gold and Copper Resources in Henan Province, Zhengzhou　450006, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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