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Effects of Fe2O3 on the properties of ceramics from steel slag

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International Journal of Minerals,Metallurgy and Materials 2018年第4期25卷 413-419页

作者： Yu Li Li-hua Zhao Ya-kun Wang da-qiang cang State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China China Electronics Standardization Institute Number 1 An-Dingmeng East Road Beijing 100007 China

Ferric oxide is one of the key factors affecting both the microstructure and the properties of CaO-MgO-SiO2-based ceramics. Research on this effect is significant in the utilization of iron-rich solid wastes in ceramics. Ceramic samples with various Fe2O3 contents（0 wt%, 5 wt%, and 10 wt%） were prepared and the corresponding physical properties and microstructure were studied. The results indicated that Fe2O3 not only played a fluxing role, but also promoted the formation of crystals. Ceramics with 5 wt% of Fe2O3 addition attained the best mechanical properties with a flexural strength of 132.9 MPa. Iron ions were dissolved into diopside, consequently causing phase transformation from diopside and protoenstatite to augite, thereby contributing to the enhancement of its properties. An excess amount of Fe2O3 addition（10 wt% or more） resulted in deteriorated properties due to the generation of an excess volume of liquid and the formation of high-porosity structures within ceramics.

关键词： solid wastes ceramics ferric oxide fluxing role augite phase transformation

Synthesis of steel slag ceramics: chemical composition and crystalline phases of raw materials

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International Journal of Minerals,Metallurgy and Materials 2015年第3期22卷 325-333页

作者： Li-hua Zhao Wei Wei Hao Bai Xu Zhang da-qiang cang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

Two types of porcelain tiles with steel slag as the main raw material （steel slag ceramics） were synthesized based on the CaO-A1203-SiO2 and CaO--MgO-SiO2 systems, and their bending strengths up to 53.47 MPa and 99.84 MPa, respectively, were obtained. The presence of anorthite, a-quartz, magnetite, and pyroxene crystals （augite and diopside） in the steel slag ceramics were very different from the composition of traditional ceramics. X-ray diffraction （XRD） and electron probe X-ray microanalysis （EPMA） results illustrated that the addition of steel slag reduced the temperature of extensive liquid generation and further decreased the firing temperature. The considerable contents of glass-modifying oxide liquids with rather low viscosities at high temperature in the steel slag ceramic adobes promoted element diffusion and crystallization. The results of this study demonstrated a new approach for extensive and effective recycling of steel slag.

关键词： ceramic materials synthesis steel slag chemical composition crystalline phases solid waste recycling

Staged reaction kinetics and characteristics of iron oxide direct reduction by carbon

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International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1025-1032页

作者： Ru-fei Wei da-qiang cang Ling-ling Zhang Yuan-yuan Bai School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Civil and Environmental Engineering University of Science and Technology Beijing Key Laboratory of Electromagnetic Processing of Materials of the Ministry of Education Northeastern University

Staged reduction kinetics and characteristics of iron oxide direct reduction by carbon were studied in this work. The characteristics were investigated by simultaneous thermogravimetric analysis, X-ray diffraction（XRD）, and quadrupole mass spectrometry. The kinetics parameters of the reduction stages were obtained by isoconversional（model-free） methods. Three stages in the reduction are Fe2O3→Fe3O4, Fe3O4→Fe O, and Fe O→Fe, which start at 912 K, 1255 K, and 1397 K, respectively. The CO content in the evolved gas is lower than the CO2content in the Fe2O3→Fe3O4stage but is substantially greater than the CO2 contents in the Fe3O4→Fe O and Fe O→Fe stages, where gasification starts at approximately 1205 K. The activation energy（E） of the three stages are 126–309 k J/mol, 628 k J/mol, and 648 k J/mol, respectively. The restrictive step of the total reduction is Fe O→Fe. If the rate of the total reduction is to be improved, the rate of the Fe O→Fe reduction should be improved first. The activation energy of the first stage is much lower than those of the latter two stages because of carbon gasification. Carbon gasification and FexOy reduction by CO, which are the restrictive step in the last two stages, require further study.

关键词： iron oxides direct reduction reduction kinetics re

Thermodynamic analysis and formula optimization of steel slag-based ceramic materials by FACTsage software

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International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 379-385页

作者： Xian-bin Ai Hao Bai Li-hua Zhao da-qiang cang Qi Tang State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Foshan Oceano Ceramic Co. Ltd.

Using steel slag as a main raw material of ceramics is considered as a high value-added way. However, the relationship among the initial composition, ceramic microstructure, and macroscopic properties requires further study. In this paper, a series of ceramics with different slag ratios （0-70wt%） were designed, and the software FACTsage was introduced to simulate the formation of crystalline phases. The simulation results indicate that mullite is generated but drastically reduced at the slag ratios of 0-25wt%, and anorthite is the dominant crystalline phase in the slag content of 25wt%-45wt%. When the slag ratio is above 45wt%, pyroxene is generated more than anorthite. This is because increasing magnesium can promote the formation of pyroxene. Then, the formula with a slag content of 40wt% was selected and optimized. X-ray diffraction results were good consistent with the simulation results. Finally, the water absorption and bending strength of optimized samples were measured.

关键词： ceramic materials steel slag phase composition thermodynamics optimization

Effects of sintering atmosphere on the physical and mechanical properties of modified BOF slag glass

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International Journal of Minerals,Metallurgy and Materials 2014年第5期21卷 494-502页

作者： Wen-bin dai Yu Li da-qiang cang Yuan-yuan Zhou Yong Fan State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Institute of Multidisciplinary Research for Advanced Materials Tohoku University

This study proposes an efficient way to utilize all the chemical components of the basic oxygen fttrnace （BOF） slag to prepare high value-added glass-ceramics. A molten modified BOF slag was converted from the melting BOF slag by reducing it and separating out iron component in it, and the modified BOF slag was then quenched in water to form glasses with different basicities. The glasses were subsequently sintered in the temperature range of 600-1000℃ in air or nitrogen atmosphere for 1 h. The effects of different atmospheres on the physical and mechanical properties of sintered samples were studied by using differential scanning calorimetry （DSC）, X-ray diffraction （XRD） and scanning electron microscopy （SEM） and by conducting experiment on evaluating the sintering shrinkage, water absorption and bulk density. It is found that the kinetics of the sintering process is significantly affected by sintering atmosphere. In particular, compared with sintering in air atmosphere, sintering in N2 atmosphere promotes the synergistic growth of pyroxene and melilite crystalline phases, which can contribute to better mechanical properties and denser microstructure.

关键词： glass ceramics slags sintering iron oxides physical properties mechanical properties

Balanced solubility product and enthalpies of formation of Nb compounds in 0.09 % oriented silicon steel

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Rare Metals 2013年第3期32卷 318-322页

作者： Hui Li Yun-Li Feng dan Zhang Meng Song da-qiang cang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Metallurgy and Energy Hebei United University

Balance solubility products and enthalpy of for- mation for NbC0.75, NbC0.85, NbC0.88, NbC and NbN in oriented silicon steels were calculated and compared quali- tatively. Meanwhile, the mixing enthalpies of these five Nb compounds were calculated based on Miedema Model. The results show that the solubility products of Nb compounds in ferrite and austenite meet the following relationship, NbC0.75 〉 NbC0.85 〉 NbC0.88 〉 NbC 〉 NbN and NbN has the minimum enthalpy of formation. It indicates that NbN easily precipitate out, but it is more difficult for NbC0.75.

关键词： Oriented silicon steel Nb compounds Solubility formula Enthalpy of formation

Preparation of hydro-sodalite from fly ash using a hydrothermal method with a submolten salt system and study of the phase transition process

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International Journal of Minerals,Metallurgy and Materials 2020年第1期27卷 55-62页

作者： Yan-bing Zong Cheng-yu Zhao Wen-hui Chen Zhao-bo Liu da-qiang cang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China China Nonferrous Engineering and Research Institute(China ENFI Engineering Corporation) Beijing 100038China

Hydro-sodalites are zeolitic materials with a wide variety of *** ash is an abundant industrial solid waste,rich in silicon and aluminum,from which hydro-sodalite can be ***,traditional hydrothermal synthesis methods are complex and cannot produce high-purity ***,there is a demand for processing routes to obtain high-purity *** the present study,high-purity hydro-sodalite(90.2 wt%)was prepared from fly ash by applying a hydrothermal method to a submolten salt *** were characterized by powder X-ray diffraction(XRD),scanning electron microscopy(SEM),thermogravimetry and differential thermal analysis(TG–DTA),and Fourier transform infrared spectroscopy(FTIR)to confirm and quantify conversion of the raw material into the product *** of the samples prepared with an H2O/Na OH mass ratio of 1.5 and an H2O/fly ash mass ratio of 10 was calculated and the conversion process of the product phase was *** of the product was influenced more by the Na OH concentration,less by the H2O/fly ash mass *** main reaction process of the system is that the Si O ions produced by dissolution of the vitreous body in the fly ash and Na+ions in the solution reacted on the destroyed mullite skeleton to produce *** processing route could help mitigate processing difficulties,while producing high-purity hydro-sodalite from fly ash.

关键词： fly ash submolten salt system hydrothermal method hydro-sodalite

Complementation in the composition of steel slag and red mud for preparation of novel ceramics

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International Journal of Minerals,Metallurgy and Materials 2018年第9期25卷 1010-1017页

作者： Yan-bing Zong Wen-hui Chen Yong Fan Tai-lin Yang Zhao-bo Liu da-qiang cang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Institute of Iron and Steel Technology TU Bergakademie FreibergFreiberg 09599Germany Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-8577Japan China Nonferrous Engineering and Research Institute(China ENFI Engineering Corporation) Beijing 100038China

A method for preparing novel ceramics was developed in this study. Different ratios red muds were added to steel slags to optimize the preparation of novel ceramics by a traditional ceramic preparation process. The sintering mechanism, microstructure, and performance were studied by X-ray diffraction techniques, scanning electron microscopy, and combined experiments of linear shrinkage, water absorption, and flexural strength. The results confirmed that red mud can reduce the volumetric instabilities through the complementarity of red mud and ferroalloy slag. The crystal phases in the ceramics are all pyroxene group minerals, including diopside ferrian, augite, and diopside. The flexural strength of the ceramic that contains 40 wt% red mud and was prepared at the optimal sintering temperature(1140°C) is greater than 93 MPa; its corresponding water absorption is less than 0.05%.

关键词： ceramics steel slag red mud flexural strength

Mechanisms of ultrafine particle formation during coal combustion in a new swirl modification device

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Journal of Iron and Steel Research International 2019年第1期26卷 11-19页

作者： Jun-xiang Guo Ling-ling Zhang Wen-bin dai Li-ying Qi Ru-fei Wei da-qiang cang School of Metallurgical and Ecological Engineering University of Science and Tech no logy BeijingBeijing 100083China School of Energy and Environment Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Solid Waste Reuse for Building Materials(SKL-SWR) Beijing Building Materials Academy of Sciences Research(BBMA)Beijing 100083China College of Energy and Environmental Engineering Hebei University of EngineeringHandan 056038HebeiChina

A new swirl combustion device was designed and enhaneed,which realized the utilization of steel slag,achieved highly efficient and clean coal combustion,and simultaneously realized a fully elemental utilization of *** distribution laws of different sized particulate matter(PM)emission and the enrichment laws of elements in particles under diverse conditions(such as various excess air coefficients and different coal ratios)were systematically *** enrichments of PM under both non-staged and fuel-staged conditions were also *** results indicated that fuel-staged combustion is more helpful in reducing PM emissions than non-staged combustion,and a suitable coal ratio is also beneficial for reducing PM *** melted liquid steel slag drop captured the fly ash produced from pulverized combustion,thus reducing PM *** alkali metal elements(K,Na,and Mg),the trace elements(As and Ti).and S have an obvious enrichment tendency in PM]and PM2.5,A different coal ratio under fuel-staged combustion has a significant influence on the enrichment of Al,Si,Ca,and Fe in PM),whereas in ***4,and PM10,the effect of different coal ratios on the enrichment of each element is slight.

关键词： Coal combustion Steel slag modification Particulate matter Elemernal enrichment Fuel-staged feed Non-staged feed Swirl modification device