Effect of MgO and BaO on viscosity and structure of blast furnace slag

Xiao, Xing; Pang, Zhuogang; Mo, Chuan; Sha, Wei E. I.; Ju, Jiantao

doi:10.1016/j.jnoncrysol.2019.119801

Cited by 63 publications

(23 citation statements)

References 24 publications

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“…The image J software was used to calculate the porosity of the ferro-coke. The ferro-coke was ground and then analyzed by X-ray diffraction (XRD, MAXima-7000, Shimadzu, Japan) that used Cu Kα radiation (λ = 1.5406 Å) with the scan rate of 2°/min in the 2 degree range of 10° to 90° [29,30]. Figure 5 shows the comparison of macro morphology of ferro-coke with different amount of iron ore powder.…”

Section: Structure Analysis Of Ferro-cokementioning

confidence: 99%

Effect of Binders on the Crushing Strength of Ferro-Coke

Deng

Wang

et al. 2021

Materials

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Ferro-coke, as a new burden of blast furnace (BF), can not only greatly reduce the energy consumption and CO2 emission, but also promote the resource utilization by using the low-quality iron ore and low-grade coal. However, the strength of ferro-coke decreased with the increasing amount of iron ore powder. In order to maintain the strength of ferro-coke while increasing the amount of iron ore powder, it is necessary to add binder during the coking process to enhance the strength of ferro-coke. In this paper, phenolic resin, silicon metal powder, corn starch, and coal tar pitch were used as binder for the fabrication of ferro-coke. I-type drum machine (I 600), scanning electron microscope (SEM), and X-ray diffraction (XRD) were applied to test the crushing strength, morphology, and microcrystalline structure of the ferro-coke. The results showed that the increasing amount of iron ore powder resulted in lower crushing strength, higher porosity, and the worse macroscopic morphology of ferro-coke. When the amount of iron ore powder reached 40%, obvious cracks appeared on the surface of ferro-coke. When the amount of iron ore was 30%, the crushing strength of ferro-coke dropped to 18.15%. Among the four binders, coal tar pitch could significantly enhance the cold crushing strength of ferro-coke through decreasing the porosity of ferro-coke and improving the bonding effect between carbon matrix particles. In the case of the 10% coal tar pitch addition, the cold crushing strength of ferro-coke was increased from 18.15% to 76.41%; meanwhile, its hot compression strength during gasification improved by 100N.

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Section: Structure Analysis Of Ferro-cokementioning

confidence: 99%

Effect of Binders on the Crushing Strength of Ferro-Coke

Deng

Wang

et al. 2021

Materials

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“…Previous works by the present authors [3] found that MgO decreased the viscosity and break temperature of BaO-bearing blast furnace (BF) slag. The results of Sun et al [4] indicated that MgO provided oxygen ions to the molten slag which caused the depolymerization of the complex structure into simple units, resulting in decreasing the viscosity of SiO 2 -CaO-17 mass% Al 2 O 3 -MgO slag, while the viscosity increased when MgO content exceeded 10 mass%.…”

Section: Introductionmentioning

confidence: 46%

Effect of MgO and K2O on High-Al Silicon–Manganese Alloy Slag Viscosity and Structure

et al. 2020

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The viscosity, melting proprieties, and molten structure of the high-Al silicon–manganese slag of SiO2–CaO–25 mass% Al2O3–MgO–MnO–K2O system with a varying MgO and K2O content were studied. The results show that with the increase in MgO content from 4 to 10 mass%, the measured viscosity and flow activation energy decreases, but K2O has an effect on increasing those of slags. However, the melting temperature increases due to the formation of high-melting-point phase spinel. Meanwhile, Fourier transform infrared (FTIR) and X-ray photoelectron spectra (XPS) were conducted to understand the variation of slag structure. The O2− dissociates from MgO can interact with the O0 within Si–O or Al–O network structures, corresponding to the decrease in the trough depth of [SiO4] tetrahedral and [AlO4] tetrahedral. However, when K2O is added into the molten slag, the K+ can accelerate the formation of [AlO4] tetrahedra, resulting in the increase in O0 and O− and the polymerization of the structure.

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“…The Raman peak position of nickel slag in this system was mainly 811 cm −1 Si-O nb bending vibration and 846 cm −1 Q 0 symmetrical stretching vibration. The results show that the content of Q 0 [24] in the slag was higher, while the relative content of Q 1 and Q 2 were lower [25]. With the CaO content increase in the nickel slag system, the relative fractions of Q 0 increased first and then decreased, while Q 1 and Q 2 decreased first and then increased gradually.…”

Section: Experimental Characterization Of Phase Composition and Micromentioning

confidence: 86%

Molecular Dynamics Simulation on Microstructure and Physicochemical Properties of FexO-SiO2-CaO-MgO-“NiO” Slag in Nickel Matte Smelting under Modulating CaO Content

Wang

Cui

et al. 2020

Minerals

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To improve the conditions of extracting iron from nickel smelting residues, the composition modulating from Fe x O-SiO 2 -CaO-MgO-"NiO" slag source for matte smelting using high MgO nickel sulfide concentrate was carried out. Based on the molecular dynamics simulation and experimental characterization, the effect of CaO content in nickel slags on the physicochemical properties, the microstructure evolution, and the feasibility of subsequent iron extraction were analyzed. The results showed that, for nickel smelting slag with 9 wt.% MgO, 13-15 wt.% CaO and Fe/SiO 2 ratio of 1.2, the melting temperature of nickel slag was lower than 1200 • C, and the viscosity was lower than 0.22 Pa·s at 1350 • C. The electric conductivity was similar to that of the industrial slag, and the interfacial tension between slag and matte was relatively large, which ensured a good separating characteristic. It not only met the requirements for the slag performances in the existing flash smelting process but also improved conditions for the subsequent iron extraction. Additionally, it could be adapted to the current situation where an increasing MgO content exists in the nickel sulfide concentrate.Minerals 2020, 10, 149 2 of 15 research results from the literatures [8,9] also show that the liquids temperature and viscosity of liquid phase can be reduced with an appropriate addition of CaO, a low amount of MgO and the reduction of oxygen potential in the system. Jian PAN et al. [6,10] used reduction-magnetic separation to recover valuable metals in nickel slags. It is shown that an increasing CaO content contributes to the enrichment of valuable metals and improves the recovery rate of Ni, Cu, Fe, and other metals. However, when CaO is added to extract Fe from waste slag, a lot of heat is consumed and a lot of waste slag is generated. Therefore, the direct addition of an appropriate amount of CaO and a reduction in SiO 2 in the smelting process is considered to regulate the nickel slag performance to meet the smelting requirements and obtain final slag, which is beneficial to the subsequent extraction of valuable metals. In this way, the proper regulation of the composition of the existing matte smelting slags from the source of solid waste is proposed to replace the past terminal treatment mode in the present study.In the production practice, MgO content in nickel concentrate is required to be less than 6.5 wt.% in the nickel flash furnace smelting system, while the MgO content is generally as high as 10 wt.% in the nickel concentrate produced by Jinchuan company (Jinchang, China). Most of the MgO in the nickel concentrate is transferred into the slags, so that the MgO content reaches 8 wt.% to 13 wt.% in the slags when using Jinchuan self-mined concentrates. It is inevitable that MgO content at the current level in slag leads to higher melting temperature, lower fluidity, and worse separation characteristics between slag-matte than before. How to solve the above problems caused by high-MgO-containing slag? Increasing smelting temperature...

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Effect of MgO and BaO on viscosity and structure of blast furnace slag

Cited by 63 publications

References 24 publications

Effect of Binders on the Crushing Strength of Ferro-Coke

Effect of Binders on the Crushing Strength of Ferro-Coke

Effect of MgO and K2O on High-Al Silicon–Manganese Alloy Slag Viscosity and Structure

Molecular Dynamics Simulation on Microstructure and Physicochemical Properties of FexO-SiO2-CaO-MgO-“NiO” Slag in Nickel Matte Smelting under Modulating CaO Content

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