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Fundamental mechanism of effects of MgO on sinter strength

Journal of Iron and Steel Research International 2019年第11期26卷 1171-1177页

作者： Hong-song Han Feng-man Shen Xin Jiang Chuan-guang Bi Hai-yan Zheng Qiang-jian Gao School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Technology Center Meishan Iron and Steel Limited CorporationNanjing 210000JiangsuChina

MgO-containing flux may have a series of effects on the quality of sinter and performances of the blast ***,the fundamental mechanism of the effects of MgO on the sinter strength was *** the chemical reagent and industrial flux were used for preparing the *** experimental results show that the sinter strength decreases with MgO *** are three reasons for *** first reason is diffusion *** all of the CaO may react with Fe2O3 and generate CaO Fe2O3,but most of MgO cannot react with Fe2O3,and it still remains in the state of original *** diffusion rate of MgO in iron oxide is only 17.51μm/min in 30 *** second reason is the fluidity and ability to generate liquid *** the case of Fe2O3 mixed with CaO,there is some liquid phase formed above 1200℃,while in the case of Fe2O3 mixed with MgO,even at 1200 and 1220℃,there is still no liquid *** third reason is *** the case of industrial flux,the compression strength of the specimens made of Fe2O3 and limestone is 0.52 and 0.71 kN at 1150 and 1180℃,respectively,while that of the specimens made of Fe2O3 and magnesite is 0.48 and 0.56 kN,***,the fundamental mechanism of the effects of MgO additive on sinter strength can be better understood based on the diffusion rate of MgO in iron oxides,the fluidity of liquid phase,and the self-strength of bonding phase.

关键词： MgO addition Sinter strength Blast furnace mineralization rate Fluidity Self-strength

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High concentration xylene decomposition and diagnostic analysis by non-thermal plasma in a DBD reactor

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Plasma Science and Technology 2017年第6期19卷 60-65页

作者： Zehua XIAO Di XU Chunjing HAO Jian QIU Kefu LlU Department of Light Sources ＆ Illuminating Engineering Fudan University Shanghai 200433 People＇s Republic of China

Dielectric barrier discharge（DBD） is utilized to decompose xylene vapor in mobile gas under normal atmospheric *** plasma is generated by an AC power source with a frequency of 6 *** the experiment,the discharge power on the DBD reactor was calculated by a Lissajous figure,and the specific input energy（SIE） of different discharge voltage or residence time was *** concentrations of xylene,carbon monoxide and carbon dioxide in the gas were analyzed by gas *** spectra of DBD were diagnosed using a *** calculated the conversion rate（CR）,mineralization rate（MR） and carbon dioxide *** relationship between these quantities and the SIE was *** experimental results show that high concentration xylene can be decomposed mostly by DBD *** CR can reach as high as 90%with the main product of carbon dioxide.

关键词： dielectric barrier discharge specific input energy conversion rate mineralization rate carbon dioxide selectivity

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Fractionation of Moderately and Highly Stable Organic Phosphorus in Acid Soil *1

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Pedosphere 1998年第3期8卷 261-266页

作者： FANYEKUAN LISHIJUN DepartmentofResources EnvironmentandAgrochemistryHuazhongAgriculturalUniversityWuhan430070（China） D

The fractionation of moderately and highly organic phosphorus (P o) in acid soil was studied by two me thods. By the first method, after incubation for 40 d, the mineralization rates of eight constituents of stable P o in the soil were determined. By the second method, five constituents of precipitates of stable P o in the soil were separated, then the five precipitates were put back into the original soils and incubated for 40 d and 60 d. Then, mineralization rates of the five precipitates were determined. The same results were obtained by the two methods. When the pH of the alkali solution containing stable P o was adjusted from 3.00 to 3.10, the mineralization rate of moderately stable P o was rapidly raised. Therefore, the pH 3.00 is the critical point between moderately and highly stable P o.

关键词： fractionation mineralization rate soil stable organic P

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