|
|
Recovery of iron from copper slag via modified roasting in CO–CO2 mixed gas and magnetic separation |
Ping‑guo Jiang1,2, Jin‑sheng Liu2, Yi‑yu Xiao2, Xiao‑heng Tan2, Wen‑jie Liu2 |
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 |
|
|
Abstract A novel technology, modified roasting in CO–CO2 mixed gas and magnetic separation, was presented to recover iron from copper slag. The effects of various parameters such as dosage of flux (CaO), gas flowrate of CO and CO2, roasting temperature, roasting time, particle size of modified slag and magnetic flux density on the oxidized modification and magnetic separation were investigated by comparison of the X-ray diffraction patterns and iron recovery ratio. The optimum conditions for recovering iron by oxidizing roasting and magnetic separation are as follows: calcium oxide content of 25 wt.%, mixed gas flow rates of CO2 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.
|
|
|
|
|
Cite this article: |
Ping‑guo Jiang,Jin‑sheng Liu,Yi‑yu Xiao, et al. Recovery of iron from copper slag via modified roasting in CO–CO2 mixed gas and magnetic separation[J]. Journal of Iron and Steel Research International, 2020, 27(7): 796-806.
|
|
|
|
[1] |
Qian Long, Jun-qi Li, Chao-yi Chen, Yuan-pei Lan, Guo-ling Wei. Optimization of iron and aluminum recovery in bauxite[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(3): 310-318. |
[2] |
Ran Wang, Zheng-gen Liu Man-sheng Chu Hong-tao Wang Wei Zhao Li-hua Gao. Modeling assessment of recovering iron from red mud by direct reduction: magnetic separation based on response surface methodology[J]. , 2018, 25(5): 497-505. |
[3] |
Jian-wen Yu*,Yue-xin Han**,Peng Gao,Yan-jun Li. Recovery of boron from high-boron iron concentrate using reduction roasting and magnetic separation[J]. Chinese Journal of Iron and Steel, 2017, 24(2): 131-137. |
[4] |
Qiang Zheng,Xue Bian,Wen-yuan Wu*. Iron recovery and rare earths enrichment from Bayan Obo tailings using Coal-Ca(OH)2-NaOH roasting followed by magnetic separation[J]. Chinese Journal of Iron and Steel, 2017, 24(2): 147-155. |
[5] |
Chao Geng,Ti-chang Sun*,You-wen Ma,Cheng-yan Xu,Hui-fen Yang. Effects of embedding direct reduction followed by magnetic separation on recovering titanium and iron of beach titanomagnetite concentrate[J]. Chinese Journal of Iron and Steel, 2017, 24(2): 156-164. |
[6] |
Yuan-pei Lan,Qing-cai Liu,*,Fei Meng,De-liang Niu,Heng Zhao. Optimization of magnetic separation process for iron recovery from steel slag[J]. Chinese Journal of Iron and Steel, 2017, 24(2): 165-170. |
|
|
|
|