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Phosphorus fixation capacity of CaO-SiO_(2)-Al_(2)O_(3)-MnO-Ce_(2)O_(3) slag based on structural considerations

Journal of Rare Earths 2023年第3期41卷 446-453,I0005页

作者： Jiali Sun Chengjun Liu maofa jiang Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

The phosphorus fixation capacity of some slag systems,such as Ce_(2)O_(3)-containing slag,has hardly been investigated from a thermodynamics view due to the lack of relevant thermodynamic *** the macroscopic properties are primarily determined by the microscopic structure,the correlation between phosphorus fixation capacity and slag structure was explored by spectroscopy(XPS),Raman spectroscopy,and ferromanganese dephosphorization *** results show that the predominant species of P^(5+)are Q_(P)^(0)(PO_(4)^(3-))and Q_(P)^(1)(P_(2)O_(7)^(4-))units in the CaO^(-)SiO_(2)-Al_(2)O_(3)-MnO^(-)Ce_(2)O_(3)-P_(2)O_(5)quenched slag,and the phosphorus fixation capacity increases with the Q_(P)^(1)(P_(2)O_(7)^(4-))unit to Q_(P)^(0)(PO_(4)^(3-))unit transformation(the P-O^(0) bond to P-O^(-)bond transformation)since the electron cloud density between P and O atoms increases and the average radius of P-O bonds ***,CaO or Ce_(2)O_(3) as a network modifier can release the O_(2)-and promote the P-O^(0) bond to P-O^(-)bond(connected to Ca^(2+),/Ce^(3+))transformation in the quenched ***,the phosphorus enrichment phases in the slow cooling slag are confirmed as nCa_(2)SiO_(3)-Ca_(3)P_(2)O_(8)(nC_(2)S-C3P)and CePO_(4) solid solutions by the scan electron microscopy(SEM),transmission electron microscopy(TEM),and energy-dispersive spectrometer(EDS)*** re sults show Ce_(2)O_(3) can depolymerize the polyphosphate structure partially replacing CaO after introducing Ce_(2)O_(3) into CaO based slag because of its strong ability to donate *** above results not only help to understand the dependence of phosphorus fixation capacity on slag composition from a structural view,but also provide the theoretical guidance for optimizing the composition of Ce_(2)O_(3)-containing dephosphorization slag.

关键词： Phosphorus fixation capacity Slag structure X-ray photoelectron spectroscopy Raman spectroscopy Ce_(2)O_(3) CePO_(4)

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Thermoelectric Characterization of (Na_(1-y)M_y)_(1.6)Co_2O_4(M=K, Ca, Sr)

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Journal of Materials Science & Technology 2006年第4期22卷 526-528页

作者： Ying LI Guiying XU maofa jiang School of Material and Metallurgy Northeastern University Shenyang 110004 China University of Science and Technology Beijing Beijing 100083 China

Oxide materials NaCo2O4 and （Na1-yMu）1.6Co2O4 （M=K, 0.05≤y≤0.35; M=Ca, St, 0.10≤y≤0.40） were prepared by a sol-gel method. Experimental resultS indicated that the Seebeck coefficient and the Powerfactor of NaCo2O4 were improved by doping Ca and Sr but not by K. The Power-factor of NaCo2O4 is in its maximum, 1.68×10^-4 W·m^-1·K^-2 and 11% bigger than that of the original one when the dopant fraction of Ca was 0.1. Doping Sr makes NaCo2O4 have the biggest Power-factor, 1.68×10^-4 W·m^-1·K^-2 that is 50% bigger than the non-doping oxide. The experimental results indicate that suitable dopants and addition amounts could improve the thermoelectric properties of NaCo2O4 greatly.

关键词： Thermoelectric materials Electric properties Sol-Gel method Doping

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Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum

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Chinese Journal of Chemical Engineering 2016年第11期24卷 1552-1560页

作者： Chengjun Liu Qing Zhao Yeguang Wang Peiyang Shi maofa jiang Key Laboratory for Ecolocal Metallurgy of Multimetallic Ores (Ministry of Education) School of Metallurgy Northeastern University Shenyang 110819 China

Plenty of flue gas desulfurization(FGD) gypsum generated from coal-fired power plants for sulfur dioxide sequestration caused many environmental issues. Preparing calcium sulfate whisker(CSW) from FGD gypsum by hydrothermal synthesis is considered to be a promising approach to solve this troublesome problem and utilize calcium sulfate in a high-value-added way. The effects of particle size of FGD gypsum, slurry concentration,and additives on CSW were investigated in this work. The results indicated that fine particle size of FGD gypsum and moderately high slurry concentration were beneficial for crystal nucleation and growth. Three additives of magnesium chloride, citric acid, and sodium dodecyl benzene sulfonate(SDBS) were employed in this study. It was found that mean length and aspect ratio of CSW were both decreased by the usage of magnesium chloride,while a small quantity of citric acid or SDBS could improve the CSW morphology. When multi-additives of citric acid-SDBS were employed, the mean length and aspect ratio increased more than 20%. Moreover, surface morphology of CSW went better, and the particle size and crystal shape became more uniform.

关键词： Calcium sulfate whisker Hydrothermal Synthesis Environment

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Thermodynamic　Study　on　BaO－BaF_2－Fe_xO　Slags　Used　for　Dephosphorization　of　Chromium－Containing　Hot　Metal

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Journal of Iron and Steel Research International 1996年第2期3卷 23-27页

作者： Chen Zaoping jiang maofa Li Yintai Northeastern University Shenyang 110006 China

Electrochemical measurements of the solid-oxide galvanic cell, Mo|Mo+MoO2|ZrO2 (MgO)| Fe+ (FexO)+Ag| Fe, have been made at temperatures of 1473K and 1573K in order to obtain the activities of FexO in BaO-BaF2-FexO slags used for dephosphorization of chromium-containing hot metal. The FexO activities show a significant dependence upon the molar ratio of BaO/BaF2. Within the homogeneous liquid region, the substitution of BaF2 for BaO has an effect of raising the FexO activity. From these activity data, the phase diagrams of the system BaO -BaF2-FexO are drawn at 1473K and 1573K. The temperature dependence of the activity coefficient of FexO at a fixed BaO/ BaF2 molar ratio can be expressed by formula RTlnγ(FexO)=constant.

关键词： activity BaO-BaF_2-Fe_xO slag chromium-containing hot metal

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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

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Research on Solidification Structure of Billet for Bearing Steel

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稀有金属材料与工程 2011年第S3期40卷 220-223页

作者： Liu Chengjun, Wang Hongpo, jiang maofa Northeastern University, Shenyang 110004, China Northeastern Univ Coll Mat & Met Shenyang 110004 Peoples R China

Secondary dendrite arm spacing (SDAS), which is an important parameter for solidification structure, has a significant effect on the level of segregation and the time for dispelling micro-segregation. The solidification structure of billets, poured under different drawing speeds for high-carbon chromium continuous casting and etched by saturated water solution of picric acid, was investigated by OLYMPUS BX51 optical microscope; and the indexes of carbon and sulfur segregation were also determined. It is concluded that the solidification structure consists of fine grain region, columnar region, cross dendrite region and central equiaxed grain region. In the columnar grain region, the SDAS at outer arc of billet is about 30 μm bigger than that of inner arc; the SDAS increases with the increasing drawing speed and the indexed of carbon and sulfur segregation change from positive segregation to the negative with the increasing SDAS. The SDAS can be used as an important parameter not only to establish reasonable secondary cooling system and drawing speed but also to judge the level of segregation in the unidirectional solidification region.

关键词： bearing steel solidification structure secondary dendrite arm spacing drawing speed segregation

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Effect of Rare Earth Elements on Transformation Behavior and Microstructure Characteristics in X80 Pipeline Steel

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稀有金属材料与工程 2011年第S3期40卷 51-55页

作者： Liu Chengjun, Liu Hongliang, jiang maofa Northeastern University, Shengyang 110004, China Northeastern Univ Sch Met & Mat Shenyang 110004 Peoples R China

The studies of the rare earth elements (RE) in low carbon steels suggest that the RE inhibits the ferrite transformation, which is the same effect as Mo alloying in pipeline steels. The purpose of this work is to discuss the relationships between the RE microalloying and the microstructure in pipeline steels. The X80 pipeline steels with different RE and Mo additions have been produced by vacuum induction furnace. The Gleeble-2000 thermal simulator, optical microscopy, and scanning electron microscopy with EBSD have been used. The continuous cooling transformation (CCT) curve was obtained and analyzed, combined with the study of microstructure. The results indicate that the microstructure of thermal simulator test metal is characteristic of quasi-polygonal ferrite and bainite, and trace RE could significantly inhibit the transformation of quasi-polygonal ferrite. The 0.0040wt% content of RE plays the same role as 0.1 wt% content of Mo alloying in pipeline steels. What’s more, the fine bainite grained structure is obtained with RE microalloying. Theoretically RE could be employed in pipeline steels as microalloying, and a partial substitution of Mo by RE is possible.

关键词： rare earth elements pipeline steel transformation microstructure CCT

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Micro-alloying of Rare Earths in Heavy Rail Steel

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稀有金属材料与工程 2011年第S3期40卷 245-249页

作者： Huang Yahe, Liu Chengjun, jiang maofa Northeastern University, Shenyang 110819, China Northeastern Univ Sch Met & Mat Shenyang 110819 Peoples R China

In the present study, heavy rail steel was prepared by the process of vacuum induction furnace smelting, forge work and rolling. Effects of Rare earths (RE) on microstructure and mechanical properties of heavy rail steel were systematically investigated by metallographic microscope, SEM, integrated mechanical testing machine, impact tester and so on. Metallographic analysis shows that, a few of RE can evidently delay the growth of austenite grain and fine pearlite. When the RE content is 0.016%, both annealing and normalizing pearlite laminae distances reach the minimum which is 115 nm (annealing) and 104nm (normalizing), respectively. But when the RE content reaches 0.133%, the annealing and normalizing pearlite laminae distance is respectively increased by 40% and 13%. Mechanical properties tests show that, a few of RE has not notable effect on the strength, but both plasticity and ductility can be improved obviously. When the RE content is 0.016%, both plasticity and ductility reach maximum. The maximum of elongation and reduction of area is 13.3% and 29.0%, respectively. However, when the RE content reaches 0.133%, the strength, plasticity and ductility are decreased. Especially, the low temperature (-40 ℃) and room temperature (20 ℃) ballistic work is respectively decreased by 9% and 24.8%.

关键词： rare earths heavy rail steel austenite pearlite mechanical properties

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利用COREX尾气还原铁矿石生产碳化铁的实验研究

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钢铁 1998年第1期33卷 18-21页

作者：王光辉姜茂发东北大学

根据热力学分析，在５５０～７００℃范围内选择相应条件进行还原铁矿石的实验，研究温度及ＣＯ－ＣＯ２－Ｈ２系气体成分不同时矿石失重情况的变化，并论述二者对于还原、析碳以及碳化铁生成的影响，确定利用ＣＯＲＥＸ尾气还原铁矿石... 详细信息

根据热力学分析，在５５０～７００℃范围内选择相应条件进行还原铁矿石的实验，研究温度及ＣＯ－ＣＯ２－Ｈ２系气体成分不同时矿石失重情况的变化，并论述二者对于还原、析碳以及碳化铁生成的影响，确定利用ＣＯＲＥＸ尾气还原铁矿石生产碳化铁的可行性。

关键词：碳化铁 COREX尾气还原析碳铁矿石电炉炼钢

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Li_2O和B_2O_3对含稀土氧化物结晶器保护渣结晶相的影响

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硅酸盐学报 2006年第3期34卷 366-370页

作者：王德永姜茂发东北大学材料与冶金学院沈阳110004

通过在结晶器保护渣中添加Li2O和B2O3作助熔剂,在实验室内模拟渣膜的形成条件,结合岩相和扫描电镜能谱分析,研究了Li2O3和B2O3对含稀土氧化物保护渣结晶矿物组成的影响。结果表明稀土氧化物可以促进保护渣中枪晶石析出,抑制玻璃相形成,... 详细信息

通过在结晶器保护渣中添加Li2O和B2O3作助熔剂,在实验室内模拟渣膜的形成条件,结合岩相和扫描电镜能谱分析,研究了Li2O3和B2O3对含稀土氧化物保护渣结晶矿物组成的影响。结果表明稀土氧化物可以促进保护渣中枪晶石析出,抑制玻璃相形成,提高保护渣结晶率;当稀土氧化物含量达到一定数值,保护渣结晶矿物中可以形成稀土硅酸钙相,稀土氧化物继续增加,会有未溶稀土氧化物固态质点出现;保护渣中加入少量B2O3和Li2O作助熔剂,不仅可以促进硅灰石生成,而且能够有效抑制高熔点的枪晶石和稀土硅酸钙形成,防止渣膜形成过程中过早析出高熔点相。

关键词：结晶器保护渣稀土氧化物结晶矿物硅酸钙

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