Chemical Composition of Dust from Stainless Steel Smelting and Existing Forms of Cr and Ni
WEI Fen-rong ZHANG Yan-ling WEI Wen-jie YANG Xiao-gang
Key Laboratory of Ecological and Recycle Metallurgy Ministry of Education, University of Science and Technology Beijing School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
Abstract：Chemical compositions, substantial phases, and microscopic morphology of stainless steel dust from TISCO and BaoSteel were analyzed by using several methods, chemical analysis, ICP, XRF, XRD, SEM-EDS and FESEM. Meanwhile, the predominance diagrams of Cr-Fe-C-O and Ni-Fe-C-O systems under various conditions were simulated by using FactSage software. Combining the conditions of stainless steel-making process, it is suggested that in stainless steel dust Cr and Ni exist in the forms of FeCr2O4 and Fe2NiO4, respectively. Furthermore, thermodynamic predictions show that for the four kinds of reduction reagents, C powder, [C] in molten iron, SiC and FeSi, FeCr2O4 is reduced to metallic Cr prior to Cr2O3, and below 1500℃ the reduction ability of these four reagents has the following order: FeSi > SiC > [C] in molten iron > C powder, while above 1500℃, it becomes: [C] > FeSi > C powder > SiC. And for the reduction of Ni, in the cases of FeSi and SiC as reagents, Fe2NiO4 is reduced prior to NiO, while in the cases of [C] and C powder used, the reduction of NiO is easier. Finally, the recovery feasibility of Cr and Ni from stainless steel dust in the form of ferroalloys is discussed.
魏芬绒 张延玲 魏文洁 杨小刚. 不锈钢粉尘化学组成及其Cr，Ni存在形态[J]. , 2011, 11(5): 786-793.
WEI Fen-rong ZHANG Yan-ling WEI Wen-jie YANG Xiao-gang. Chemical Composition of Dust from Stainless Steel Smelting and Existing Forms of Cr and Ni. , 2011, 11(5): 786-793.
2011, Vol. 11 
