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| Recovery of iron copper slag via modified roasting in CO–CO<sub>2</sub> mixed gas and magnetic separation |
| Ping‑guo Jiang<sup>1,2</sup>, Jin‑sheng Liu<sup>2</sup>, Yi‑yu Xiao<sup>2</sup>, Xiao‑heng Tan<sup>2</sup>, Wen‑jie Liu<sup>2</sup> |
| 1 School of Materials Science, Shanghai Dianji University, Shanghai 201306, China; 2 Department of Materials, Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China |
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Abstract A novel technology, modified roasting in CO–CO<sub>2</sub> mixed gas and magnetic separation, was presented to recover iron copper slag. The effects of various parameters such as dosage of flux (CaO), gas flowrate of CO and CO<sub>2</sub>, roasting temperature, roasting time, particle size of modified slag and magnetic flux density on the oxidized modification and magnetic separation were investigatedcomparison of the X-ray diffraction patterns and iron recovery ratio. The optimum conditions for recovering ironoxidizing roasting and magnetic separation are as follows: calcium oxide content of 25 wt.%, mixed gas flow rates of CO<sub>2</sub> and CO of 180 and 20 mL/min, oxidizing roasting at 1323 K for 2 h, grinding the modified slag to 38.5–25.0 μm and magnetic separation at 170 mT. The mineralogical and microstructural characteristics of modified slag revealed that the iron-bearing minerals in the copper slag were oxidized, the generated magnetite grew into large particles, and the silicate in copper slag was combined with calcium oxide to form calcium silicate. Finally, the iron-bearing concentrate with an iron grade of 54.79% and iron recovery ratio of 80.14% was effectively obtained.
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| Cite this article: |
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Ping‑guo Jiang,Jin‑sheng Liu,Yi‑yu Xiao, et al. Recovery of iron copper slag via modified roasting in CO–CO<sub>2</sub> mixed gas and magnetic separation[J]. Journal of Iron and Steel Research International, 2020, 27(7): 796-806.
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2020, Vol. 27 
