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Magnesium-containing pellet regulating blast furnace ferrous burden interaction:softening-melting behavior and mechanism

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Journal of Iron and Steel Research International 2024年第7期31卷 1623-1635页

作者： Li-ming Ma Jian-liang Zhang Yao-zu Wang Xiao-yong Ma Gui-lin Wang Zhuo Li Hui-qing Jiang Zheng-jian Liu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China Lingyuan Iron and Steel Group Co. Lingyuan 122500LiaoningChina

MgO participates in all stages of sintering,pelletizing,and blast furnace ironmaking,and synergistically optimizing the distribution of MgO in ferrous burden can effectively enhance the interaction within the ferrous burdens and optimize the softening-melting properties of the mixed ***-containing pellets mixed with low-MgO sinter or mixed with high-MgO sinter in the blast furnace ferrous burden structure have opposite softening-melting performance *** the structure of the ferrous burden is magnesium-containing pellets mixed with low-MgO sinter,the magnesium-containing pellets can enhance the interaction of the ferrous burden in the process of softening-melting,which can optimize the composition of the slag phase and improve the slag *** the structure of the ferrous burden is magnesium-containing pellets mixed with high-MgO sinter,the magnesium-containing pellets weaken the interaction of the ferrous burden in the process of softening-melting,increase the content of the high melting point solid-phase particles in the slag,lead to an increase in the viscosity of the slag and difficult separation of the slag and iron,and decrease the permeability of the charge ***,to ensure good permeability of the mixed burden,the following measures are suggested:optimizing the MgO distribution of the ferrous burden,reducing the MgO content of the sinter to 1.96 wt.%,increasing the MgO content of the pellets to 1.03-1.30 wt.%,controlling the MgO/Al_(2)O_(3) ratio of the mixed burden within 1.15-1.32,narrowing the position of the cohesive zone,and maintaining an S value(permeability index)of approximately 150 kPa℃.

关键词： Ironmaking Ferrous burden softening-melting property Interaction Permeability Slag

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Effect of organic binders on the activation and properties of indurated magnetite pellets

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International Journal of Minerals,Metallurgy and Materials 2021年第7期28卷 1145-1152页

作者： Cui Wang Chen-yang Xu Zheng-jian Liu Yao-zu Wang Rong-rong Wang Li-ming Ma State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Ferrous Metallurgy RWTH Aachen UniversityIntzestraße 152072 AachenGermany

In the ironmaking process,the addition of an organic binder to replace a portion of bentonite has the potential to improve the per-formance of *** interaction between original bentonite(OB)and organic binder was *** indicated that the micromor-phology of organic composite bentonite(OCB)became porous and the infrared difference spectrum exhibited a curved *** addition,the residual burning rates of OB and organic binder were determined to be 82.72%and 2.30%,***,the influence of OCB on the properties of pellets was *** compressive strength of OCB-added green pellets(14.7 N per pellet)was better than that of OB-ad-ded pellets(10.3 N per pellet).Moreover,the range of melting temperature of OCB-added green pellets(173℃)was narrower than that of OB-added pellets(198℃).The compressive strength of OCB-added green pellets increased from 2156 to 3156 N per pellet with the increase in roasting temperature from 1200 to 1250℃.

关键词： pellets organic composite bentonite softening-melting property interaction behavior

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Effect of lump ore ratio on the metallurgical properties of blast furnace charge

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Baosteel Technical Research 2023年第4期17卷 28-34页

作者： TAN Chenglin MAO Xiaoming XU Wanren Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

We conducted a series of experimental studies on the metallurgical properties of N-lump and F-lump ores used in Baosteel’s blast furnace, including thermal cracking, low-temperature reduction pulverization, reducibility, and droplet *** results show that the thermal burst properties of N-lump ore are better than those of F-lump *** low-temperature reduction degradation index(RDI) pulverization of the charge is the best when the ratios of N-lump ore and F-lump ore account for 35% *** reduction performance of the charge is improved when F-lump and N-lump ores are mixed with *** the softening-melting performance experiment, when the proportion of N-lump ore is 40%,the characteristic area value(S) as the charge permeability index is the *** F-lump ore is mixed with sinter, its droplet performance improves compared with that of single F-lump *** proportion of F-lump ore should not exceed 15%.

关键词： lump ore ratio metallurgical property experiment softening-melting property the RDI pulverization reduction property

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