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Effect of Al2O3 modification on enrichment and stabilization of chromium in stainless steel slag

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Journal of Iron and steel Research International 2017年第3期24卷 258-265页

作者： Long-hu Cao Cheng-jun Liu Qing Zhao Mao-fa Jiang Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education) Northeastern University Shenyang 110819 Liaoning China

Spinel phase is considered to be the optimal phase for stabilization of chromium in stainless steel *** order to restrain chromium leaching from slag for the effective environmental protection,Al2O3 was utilized for the modification treatment,and the effects on the enrichment and stabilization of chromium were investigated. The mineral phases and the existence state of chromium in slag with various Al2O3 contents at different basicities（ w（CaO）/w（SiO2） were analyzed by scanning electron microscopy-energy dispersive spectroscopy（ SEM-EDS） and X-ray diffraction（ XRD）. The results showed that chromium mainly existed in the glass and spinel phases at basicity of 1. 0 and 1. 5. As the slag basicity increased to 2. 0,chromium was also found in periclase phase. Al2O3 in the stainless steel slag reacted with MgO and Cr2O3,which could generate the Al-rich Mg（CrxAl（1- x））2O4 solid solution. Moreover,the addition of Al2O3 was favorable to reduce the solubility of chromium oxide in liquid phase and suppress the precipitation of periclase phase. The experimental results demonstrated that Al2O3 modification has a positive influence on the enrichment and the stabilization of chromium in the stainless steel slag.

关键词： stainless steel slag Chromium Spinel Al2O3 modification Enrichment Stabilization

Effects of iron oxide on crystallization behavior and spatial distribution of spinel in stainless steel slag

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 292-300页

作者： Zihang Yan Qing Zhao Chengzhi Han Xiaohui Mei Chengjun Liu Maofa Jiang Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

Chromium plays a vital role in stainless steel due to its ability to improve the corrosion resistance of the ***,the re-lease of chromium from stainless steel slag(SSS)during SSS stockpiling causes detrimental environmental *** prevent chromium pollution,the effects of iron oxide on crystallization behavior and spatial distribution of spinel were investigated in this *** results revealed that FeO was more conducive to the growth of spinels compared with Fe2O3 and *** were found to be mainly distrib-uted at the top and bottom of *** amount of spinel phase at the bottom decreased with the increasing FeO content,while that at the top *** average particle size of spinel in the slag with 18wt%FeO content was 12.8μ***,no notable structural changes were observed with a further increase in FeO *** other words,the spatial distribution of spinel changed when the content of iron oxide varied in the range of 8wt%to 18wt%.Finally,less spinel was found at the bottom of slag with a FeO content of 23wt%.

关键词： stainless steel slag spinel chromium waste remediation ferrous oxide

Properties of steel slag and stainless steel slag as Cement Replacement Materials:A Comparative Study

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Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1444-1451页

作者： SALY Fathy GUO Liping MA Rui GU Chunping SUN Wei School of Material Science and Engineering Southeast UniversityNanjing 211189China Collaborative Innovation Center for Ad-vanced Civil Engineering Materials Nanjing 211189China Jiangsu Key Laboratory of Construction Materials Nanjing 211189China College of Civil Engineering and Architecture Zhejiang University of TechnologyHangzhou 310014China

To enhance the understanding about the utilization of steel slags as a cementitious material, we comparatively studied the chemical, mineralogical and morphological properties of two types of steel slag; basicoxygen-furnace carbon slag(BOF C) and electric-arc-furnace stainless steel slag(EAF S). Moreover, we studied the standard consistency, setting time and the effect of the slag replacement ratios on the fluidity and compressive strength of blended cement mortar. The experimental results showed that BOF C had higher alkalinity, higher pH value and more hydraulic phases than EAF S. Both types of slag showed water reduction effect due to its high fineness. Neat BOF C paste showed flash set and acceleration in the initial setting time of blended cement especially at high slag proportions. However, EAF S prolonged the setting time of blended cement even at low slag proportions. The pH values for blended cement contained 50% BOF C or EAF S were lower than those of pure cement paste. Despite of slag type, compressive strength gradually decreased with increasing slags content. The strength of BOF C mortar was higher than that of EAF S mortar with the same replacement ratio for the same age. slag activity index demonstrated that BOF C and EAF S conformed to the Chinese National Standard(GB/T 20491-2006) requirements for steel slag as grade one and grade two, respectively.

关键词： steel slag stainless steel slag fluidity setting time compressive strength activity index

Effect of CaO/SiO2 Mass Ratio on the Precipitation Behavior of Spinel Phase in stainless steel slag

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Effect of CaO/SiO2 Mass Ratio on the Precipitation Behavior ...

Challenges in the use of stainless steel slag

“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Cao Longhu Liu Chengjun Zhang Chi Jiang Maofa Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education) Northeastern University

In the present work, synthetic samples of CaO-SiO-MgO-AlO-FeO-CrO slagwere obtained to analyze the effect of CaO/SiO mass ratioon the precipitation of spinel *** samples were heated to 1600°C for melting completely,and then slowly cooled to 1300°C for holding 30 min beforequenching in water. The phases composition and precipitation behavior of spinel phasewere analyzed by X-ray powder diffraction(XRD) and scanning electron microscope-energydispersive spectroscopy(SEM-EDS). The law of conservation of mass and linear least square equation were used to calculate the mineral phase proportion in stainless steel slag. The leaching test was conducted for pointing out the chromium stability in different CaO /SiO ratio slags. The results showed that Cr was mainly enriched in spinel phase and liquid phase. slag composition with CaO/SiO=1.5 was beneficial to improve theprecipitation of spinel phase and reduce the chromium leaching *** CaO /SiO ratioshould be avoided, which could lead to the formation of leachable chromium containing periclase phase and high chromium leaching. The average grain size of spinel phase was found to increase with decreasing CaO/SiO ratio.

关键词： stainless steel slag spinel phase thermodynamic leaching basicity

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Baosteel Technical Research 2010年第S1期4卷 138-页

作者： Juha YLIMAUNU Timo PARVIAINEN Outi JRVINEN Outokumpu Oyi.Corporate Management Riihitontuntie 7 A P.O.Box 140FI-02201 EspooFinland R & D Engineer Outokumpu stainless Oy Outokumpu Tornio WorksFI-95490 TornioFinland Aalto University School of Science and Technology HelsinkiFinland

stainless steel melting shops of Outokumpu Group are located in Finland,Sweden and England(UK). In all of the countries the European Union legislation is the same,but in practice the plants face different technical,economical and administrative challenges in developing sustainable treatments and use of by-products. Due to availability of good natural construction materials,the use of slag and other industrial by-products has been quite small in Northern *** furnace slag has been completely utilized,while slag from stainless steel processes has earlier been regarded as *** of the metallurgical melt phase,slag cooling,treatment and metal recovery processes are the main technical challenges for increasing the sustainable use of stainless steel slag. Moreover,product properties have to fulfill standards and customer *** or water-cooled EAF slag aggregates are typically used in road *** has developed light mineral slag aggregates which are cooled in rapid water *** this process,a specific structure and mineralogy is formed in the slag and leaching from the material *** many regulatory discussions,it seems that there is not enough relevant scientific data from harmful *** values are based only on laboratory tests and model estimations,not on the material use itself or real nature.A risk-based approach is needed when environmental acceptance is not *** values based on content are not applicable because environmental or health risks depend on the release or leaching of substances from the *** is the case especially with metals.

关键词： stainless steel slag slag aggregate environmental acceptance leaching