|
|
Effect of Sodium Sulfate on Direct Reduction of Beach Titanomagnetite for Separation of Iron and Titanium |
En-xia GAO,Ti-chang SUN,Zhi-guo LIU,Chao GENG,Cheng-yan XU |
School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China |
|
|
Abstract The effect of sodium sulfate on direct reduction of beach titanomagnetite, followed by magnetic separation, to separate iron and titanium was investigated. Direct reduced iron (DRI) with a high Fe content, low TiO2 content and low iron recovery was obtained after adding sodium sulfate. When the sodium sulfate dosage was increased from 0 to 10 mass%, the Fe content of the DRI increased from 90.00 mass% to 93.55 mass% and the TiO2 content decreased from 1.27 mass% to 0.70 mass%. The reduction mechanism of sodium sulfate was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS). Results revealed that the metallic iron grains in the reduced ore with sodium sulfate were larger than those in the ore without sodium sulfate. Sodium sulfate promoted the migration of iron as well as the accumulation and growth of metallic iron grains by low-melting-point carnegieite and troilite formed in the redox system. Low-melting-point carnegieite decreased the melting point of the system and then promoted liquefaction. Troilite could decrease the surface tension and melting point of metallic iron grains.
|
Received: 25 June 2015
Published: 06 May 2016
|
Fund:National Natural Science Foundation of China |
|
|
|
[1] |
Xue-feng She,*,Xiu-wei An,Jing-song Wang,Qing-guo Xue,Ling-tan Kong. Numerical analysis of carbon saving potential in a top gas recycling oxygen blast furnace[J]. Chinese Journal of Iron and Steel, 2017, 24(6): 608-616. |
[2] |
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. |
[3] |
Chao Geng,,Hua-jun Wang,*,Wen-tao Hu,Li Li,Cheng-shuai Shi. Recovery of iron and copper from copper tailings by coal-based direct reduction and magnetic separation[J]. Chinese Journal of Iron and Steel, 2017, 24(10): 991-997. |
[4] |
Wei Li,Gui-qin Fu,Man-sheng Chu,Miao-yong Zhu*. Reduction behavior and mechanism of Hongge vanadium titanomagnetite pellets by gas mixture of H2 and CO[J]. Chinese Journal of Iron and Steel, 2017, 24(1): 34-42. |
[5] |
Hui-qing Tang*,Xiu-feng Fu,Yan-qi Qin,Shi-yu Zhao,Qing-guo Xue. Production of low-silicon molten iron from high-silica hematite using biochar[J]. Chinese Journal of Iron and Steel, 2017, 24(1): 27-33. |
[6] |
Dong��bo HUANG,Yan��bing ZONG,Ru��fei WEI,Wei GAO,Xiao��ming LIU,. Direct Reduction of High��phosphorus Oolitic Hematite Ore Based on Biomass Pyrolysis[J]. Chinese Journal of Iron and Steel, 2016, 23(9): 874-883. |
|
|
|
|