Modification of industrial BOF slag: Formation of MgFe2O4 and recycling of iron
Modification of industrial BOF slag: Formation of MgFe2O4 and recycling of iron
复制标题
工业转炉渣的改性：MgFe2O4的形成和铁的回收
DOI：
10.1016/j.jallcom.2017.04.142
复制
发表时间：
2017-07
影响因子：
6.2
通讯作者：
Bjorkman Bo
中科院分区：
文献类型：
--
作者：
Peng Xue;Dongfeng He;Anjun Xu;Zongxi Guo;Qixing Yang;Engstrom;Fredrik;Bjorkman Bo
氧气顶吹转炉渣中氧化铁的有效回收一直是冶金领域的一个难题。本研究开发了一种高效回收氧化铁的新方法：先将工业转炉渣与6.00%SiO2混合，使其转化为镁铁尖晶石（MgFe 2 O 4），然后以1 °C/min的速率将改性渣从1400 °C冷却至1270 °C，最后通过磁选回收铁资源。进行了XRD、SEM-EDS分析、Factsage热力学模拟、磁化表征、干磁分离和化学分析等实验和分析。结果表明，所得MgFe 2 O 4具有较高的熔点（理论值为1716.76 °C）和铁磁性（比磁化率为（8.03-206.84）× 10− 5 m3/kg）。因此，它可以从弱磁性的工业转炉炉渣（比磁化率为（0.024-0.136）× 10− 5 m3/kg）中分离出来。该方法适用于不同转炉渣系。当Fe_2O_3含量在25.81- 46.90%时，MgFe_2O_4的产率可达80%以上。经改性和磁选后，工业转炉渣中全铁含量由21.20%提高到37.00%，提高了15.80%。这比氧化铁不经任何处理直接磁选要好。磁渣可作为烧结材料或溅渣护炉材料使用。炉渣可用于生产高附加值的建筑材料。因此，该方法可用于回收工业转炉渣中的氧化铁，实现钢铁工业的可持续发展。
Efficient recycling of iron oxide from industrial BOF (basic oxygen furnace) slags has always been an issue in metallurgy. In this study, a new method was developed for the efficient recycling of iron oxide: It was transformed into magnesioferrite spinel (MgFe2O4) by mixing the industrial BOF slag with 6.00% SiO2first, and then the modified slag got cooled down from 1400 °C to 1270 °C at a rate of 1 °C/min. Finally, the Fe resources were recycled by magnetic separation. Various experiments and analyses such as XRD, SEM–EDS analyses, Factsage thermodynamic simulation, magnetization characterization, dry magnetic separation, and chemical analysis were carried out. The results show that the obtained MgFe2O4has a high melting point (1716.76 °C in theory) and ferromagnetism (specific magnetic susceptibility of (8.03–206.84) × 10−5m3/kg). Therefore, it could be separated from the weakly magnetic industrial BOF slag (specific magnetic susceptibility of (0.024–0.136) × 10−5m3/kg). Furthermore, this new method could be applied to different BOF slags. The yield of MgFe2O4increased to above 80% when the content of Fe2O3was in the range 25.81–46.90%. After the modification and magnetic separation, the total Fe content increased by 15.80%, from 21.20% in the industrial BOF slag to 37.00% in the magnetic slag. This is better than the direct magnetic separation of iron oxide without any treatment. The magnetic slag could be reused as either a sintering or slag splashing material. The nonmagnetic slag can be used to produce high value-added building materials. Hence, this new method can be used to recycle the iron oxide from industrial BOF slags, achieving the sustainable development of the iron and steel industry.
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影响因子：
8
作者：
A. Semykina
通讯作者：
A. Semykina
影响因子：
6.1
作者：
R. Young;P. Mackie;R. Dreele
通讯作者：
R. Young;P. Mackie;R. Dreele
DOI：
10.1016/s1006-706x(12)60006-5
发表时间：
2011-12
影响因子：
2.5
作者：
Jintao Gao;Shi-qi Li;Yan-ting Zhang;Yan-ling Zhang;Peiyu Chen;Ping Shen
通讯作者：
Jintao Gao;Shi-qi Li;Yan-ting Zhang;Yan-ling Zhang;Peiyu Chen;Ping Shen
影响因子：
3.9
作者：
E. Chang;An-Chia Chiu;S. Pan;Yi-Hung Chen;Chung-Sung Tan;P. Chiang
通讯作者：
E. Chang;An-Chia Chiu;S. Pan;Yi-Hung Chen;Chung-Sung Tan;P. Chiang
影响因子：
12.8
作者：
J. Stimson;G. Chae;C. Ptacek;M. Emelko;M. M. Mesquita-M.;R. Hirata;D. Blowes
通讯作者：
J. Stimson;G. Chae;C. Ptacek;M. Emelko;M. M. Mesquita-M.;R. Hirata;D. Blowes