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At present, cost reduction and environmental protection are the mainstream of blast furnace (BF) development and the high lump ore ratio is an effective means. Therefore, it is significant to explore the relationship and mechanism of burden soft-melt dropping and its primary-slag formation behaviors under increasing lump ore ratio. In this paper, the melt–drop test is carried out on the single ore and mixed burden, and obtained primary-slag properties are subjected to analysis. The experimental results show that the primary-slag of lump ore contains a large amount of FeO and SiO2, so it simply produces many low melting point compounds, which cause terrible soft-melt dropping properties and primary-slag formation behaviors. Notably, mixing with sinter and pellet can effectively improve both the properties. With the increase in lump ore ratio, the CaO in the primary-slag decreases, FeO and SiO2 increase, resulting in the melting temperature of the primary-slag sequentially decreasing and the cohesive zone moves to the low temperature zone. In addition, the maximum pressure difference increases, and the gas permeability deteriorates. Increasing the sinter ratio can overcome the defect of high lump ore ratio that can effectively improve the poor softening performance, melting performance and the position and thickness of the cohesive zone. However, because of the pulverization performance, the maximum pressure difference and gas permeability of the burden become worse.
Yun-Fei Li; Zhi-Jun He; Wen-Long Zhan; Wei-Guo Kong; Peng Han; Jun-Hong Zhang; Qing-Hai Pang. Relationship and Mechanism Analysis of Soft-Melt Dropping Properties and Primary-Slag Formation Behaviors of the Mixed Burden in Increasing Lump Ore Ratio. Metals 2020, 10, 1254 .
AMA StyleYun-Fei Li, Zhi-Jun He, Wen-Long Zhan, Wei-Guo Kong, Peng Han, Jun-Hong Zhang, Qing-Hai Pang. Relationship and Mechanism Analysis of Soft-Melt Dropping Properties and Primary-Slag Formation Behaviors of the Mixed Burden in Increasing Lump Ore Ratio. Metals. 2020; 10 (9):1254.
Chicago/Turabian StyleYun-Fei Li; Zhi-Jun He; Wen-Long Zhan; Wei-Guo Kong; Peng Han; Jun-Hong Zhang; Qing-Hai Pang. 2020. "Relationship and Mechanism Analysis of Soft-Melt Dropping Properties and Primary-Slag Formation Behaviors of the Mixed Burden in Increasing Lump Ore Ratio." Metals 10, no. 9: 1254.
In order to systematically elucidate the combustion performance of fuel during sintering, this paper explores the influence of three factors, namely coal substitution for coke, quasi-particle structure and the coupling effect with reduction and oxidation of iron oxide, on fuel combustion characteristics, and carries out the kinetic calculation of monomer blended fuel (MBF) and quasi-granular fuel (QPF). The results show that replacing coke powder with anthracite can accelerate the whole combustion process. MBF and QPF are more consistent with the combustion law of the double-parallel random pore model. Although the quasi-particle structure increases the apparent activation energy of fuel combustion, it can also produce a heat storage effect on fuel particles, improve their combustion performance, and reduce the adverse effect of diffusion on the reaction process. In the early stage of reaction, the coupling between combustion of volatiles and reduction of iron oxide is obvious. The oxidation of iron oxide will occur again when the combustion reaction of fuel is weakened.
Jihui Liu; Yaqiang Yuan; Junhong Zhang; Zhijun He; Yaowei Yu. Combustion Kinetics Characteristics of Solid Fuel in the Sintering Process. Processes 2020, 8, 475 .
AMA StyleJihui Liu, Yaqiang Yuan, Junhong Zhang, Zhijun He, Yaowei Yu. Combustion Kinetics Characteristics of Solid Fuel in the Sintering Process. Processes. 2020; 8 (4):475.
Chicago/Turabian StyleJihui Liu; Yaqiang Yuan; Junhong Zhang; Zhijun He; Yaowei Yu. 2020. "Combustion Kinetics Characteristics of Solid Fuel in the Sintering Process." Processes 8, no. 4: 475.
This study evaluated the effect of an increase in carbon content and the presence of the elements Mo and V on the microstructure and properties of the surfacing layer of stainless steel powder for knives and scissors production. Various types of high-quality stainless steel powder (5Cr13, 8Cr13, and 8Cr13MoV) were deposited on the surface of low-grade stainless steel used to produce knives and scissors (2Cr13). The microstructure, comprehensive hardness, wear resistance, impact toughness, and corrosion resistance of the stainless steel powder surfacing layers were tested and analyzed. Results indicate that the increase in carbon content and the presence of Mo and V improve the comprehensive hardness and wear resistance of the stainless steel powder surfacing layer, and both exert the superposition effect. However, the increase in carbon content and the presence of Mo and V slightly influence the impact toughness of the surfacing layer. In addition, the increase in carbon content significantly reduces the corrosion resistance of the surfacing layer. This adverse effect is reduced when Mo and V exist. Other advantages of the presence of Mo and V in the stainless steel powder surfacing layer include the refinement of grain size, reduction of carbide particle size, and improvement of the metallurgical bonding of the surfacing layer and the matrix.
Taixu Xu; Chongyi Wei; Xiao Han; Jihui Liu; Zhijun He; Nan Lü. Effect of Carbon Content and Elements Mo and V on the Microstructure and Properties of Stainless Steel Powder Surfacing Layer. Coatings 2020, 10, 371 .
AMA StyleTaixu Xu, Chongyi Wei, Xiao Han, Jihui Liu, Zhijun He, Nan Lü. Effect of Carbon Content and Elements Mo and V on the Microstructure and Properties of Stainless Steel Powder Surfacing Layer. Coatings. 2020; 10 (4):371.
Chicago/Turabian StyleTaixu Xu; Chongyi Wei; Xiao Han; Jihui Liu; Zhijun He; Nan Lü. 2020. "Effect of Carbon Content and Elements Mo and V on the Microstructure and Properties of Stainless Steel Powder Surfacing Layer." Coatings 10, no. 4: 371.
In this paper, Huolinhe lignite was selected as the lignite experimental sample, using microwave modification and ultrasonic modification separately as improvement methods. The three-dimensional molecular models of HLH before and after modification were established base on the parameters obtained by 13C NMR, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman), and Fourier transform infrared (FTIR). After the microwave treatment, the methylene carbon in the HLH coal sample structure mostly exists in the form of long straight chains, and after microwave and ultrasonic treatment, the -OH content of oxygen atoms in the coal sample increases, and form the CO- and the COO-. The proportion is decreasing. The models were adjusted and tested by the covalent bond concentration method and carbon chemical shift spectra calculation using Chemdraw software. A new method is proposed to study the structure and physicochemical properties of lignite modification from the molecular point of view through this study.
Jihui Liu; Shuang Qiu; Zhijun He; Yaowei Yu. Experiments and 3D Molecular Model Construction of Lignite under Different Modification Treatment. Processes 2020, 8, 399 .
AMA StyleJihui Liu, Shuang Qiu, Zhijun He, Yaowei Yu. Experiments and 3D Molecular Model Construction of Lignite under Different Modification Treatment. Processes. 2020; 8 (4):399.
Chicago/Turabian StyleJihui Liu; Shuang Qiu; Zhijun He; Yaowei Yu. 2020. "Experiments and 3D Molecular Model Construction of Lignite under Different Modification Treatment." Processes 8, no. 4: 399.