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Kinetics of isothermal reduction of stainless steelmaking dust pellets

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中国有色金属学会会刊：英文版 2004年第3期14卷 593-598页

作者：彭及彭兵余笛唐谟堂宋海 J.Lobel3 J.A.kozinski College of Metallurgical Science and Engineering College of Information Science and Engineering Department of Metallurgical Engineering

The stainless steelmaking dust pellets were reduced in isothermal temperature condition simulating the direct recycling practice in the stainless steel production and the kinetics of the reduction process was investigated. The pellets were formed after mixing the dust with carbon as the reducing agent and dolomite as the binder and smelting flux. An electric furnace was used to heat the pellets and an electrical microbalance was used to check the mass of the pellets in the reduction process. The reduction rate was calculated according to the data of pellet mass change in consideration of the evaporation of moisture, zinc and lead at high temperature. The results of the experiments show that the reduction process is in two consecutive stages. The reduction kinetic models were set up for each stage and the kinetic parameters such as activation energy and frequency factor were determined. The apparent activation energy of the first stage is 21.69 kJ/mol, and this stage is controlled by chemical reaction. The apparent activation energy of the second stage is 17.35 kJ/mol, and this stage is controlled by the diffusion of carbon monoxide through the resultants of reaction.

关键词：不锈钢炼钢尘泥等温分解动力学循环利用

Volatilization of zinc and lead in direct recycling of stainless steel making dust

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中国有色金属学会会刊：英文版 2004年第2期14卷 392-396页

作者：彭及彭兵余笛唐谟堂 J.Lobel J.A.kozinski School of Metallurgical Science and Engineering School of Information Science and Engineering Department of Metallurgical Engineering

The volatilization of zinc and lead from the stainless steel making dust pellets in the direct recycling procedure was conducted by using a thermo-gravimetric analyzer and a Tamman furnace in the nitrogen atmosphere respectively. The results show that the temperature has a significant effect on the volatilization rates of zinc and lead, and the carbon content in the pellets has no effect on the volatilization process. The volatilization of zinc is controlled by the chemical reaction between zinc oxide and carbon monoxide, while the volatilization of lead is controlled by the evaporation from liquid phase to the atmosphere. The volatilization of zinc and lead mainly happen at about 1 000 ℃ according to non-isothermal experiment.

关键词：不锈钢炼钢冶炼烟尘电弧炉 AOD炉 VOD炉

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不锈钢冶炼粉尘中锌还原的研究

中南工业大学学报 2002年第3期33卷 242-246页

作者：彭兵张传福彭及柴立元陈为亮 Jonathan Lobel janusza.kozinski 中南大学冶金科学与工程学院湖南长沙410083 Department of Metallurgical Engineering McGill University3610 University StreetMontreal

直接还原回收有价金属处理不锈钢冶炼粉尘过程中 ,锌在冶炼系统中不断循环积聚 ,可从收尘系统中分离出高含锌粉尘 ,然后采用CO在等离子炉中选择性还原回收锌 .作者研究了反应温度、粉尘给料速度、粉尘给料量与还原剂CO量比等对锌还原挥... 详细信息

直接还原回收有价金属处理不锈钢冶炼粉尘过程中 ,锌在冶炼系统中不断循环积聚 ,可从收尘系统中分离出高含锌粉尘 ,然后采用CO在等离子炉中选择性还原回收锌 .作者研究了反应温度、粉尘给料速度、粉尘给料量与还原剂CO量比等对锌还原挥发率的影响 ,建立了还原过程的数学模型 .研究结果表明 :还原温度对粉尘中锌的还原影响很大 ,升高温度有利于锌的还原 ,但当温度超过 12 2 8.2℃时 ,进一步升高温度不会明显提高锌的还原率 ,高的锌还原率的获得还应通过降低给料速度和控制给料比来实现 ;在 14 0 0℃ ,给料速度为 5 0g/min ,给料比为 4 5∶1时 ,锌还原率可达 99 98%;ZnFe2 O4在高温下可分解 ,在还原过程进行前将粉尘中ZnFe2 O4分解可显著提高锌的还原挥发率 .

关键词：氧化锌还原冶炼粉尘

Thermo-analytical study on stainless steelmaking dust

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Journal of Central South University of Technology 2003年第4期10卷 301-306页

作者：彭及彭兵余笛唐谟堂 Neil Souza Janusz A.kozinski Jonathan Lobel School of Metallurgical Science and Engineering School of Information Science and Engineering Department of Metallurgical Engineering

Thermo-gravimetric analyzer (TGA) was used to determine the thermal behavior of stainless steelmaking dust and FTIR was used to detect the components of off-gas. The TGA results indicate that three mass loss/gain stages exist in the thermal process. The mass loss of the dust in the first stage results from the evaporation of moisture and the reaction between dissociated carbon and metal oxides in the dust. The evaporation of moisture within the dust happens at 90-350 ℃ and the formation of carbon dioxide happens at 250-470 ℃. The mass gain of the dust in the second stage results from the oxidation of metals in the dust by the oxygen at 470-950 ℃. The third stage is a slow mass loss process, and some metals in the dust are evaporated into the atmosphere in this stage. The evaporation of metals is carried out mainly at 900-1 200 ℃ and the dust is sintered at high temperature over 1 200 ℃.

关键词： thermal analysis stainless steelmaking dust environmental protection

Comparative evaluation for catalytic gasification of petroleum coke and asphaltene in subcritical and supercritical water

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Journal of Energy Chemistry 2019年第4期28卷 107-118页

作者： Rachita Rana Sonil Nanda Aimee Maclennan Yongfeng Hu Janusz A.kozinski Ajay K.Dalai Department of Chemical and Biological Engineering University of Saskatchewan Department of Chemical and Biochemical Engineering University of Western Ontario Soft X-Ray Micro-Characterization Beamline Canadian Light Source Inc. New Model in Technology & Engineering

Subcritical and supercritical water gasification of petroleum coke and asphaltene was performed at variable temperatures(350–650°C),feed concentrations(15–30 wt%)and reaction times(15–60 min).Nickel-impregnated activated carbon(Ni/AC)was synthesized as a catalyst for enhancing syngas yields at optimal gasification conditions(650°C,15 wt%and 60 min).Structural chemistry of precursors and chars developed at different gasification temperatures was studied using physicochemical and synchrotronbased approaches such as carbon–hydrogen–nitrogen–sulfur(CHNS)analysis,thermogravimetric and differential thermogravimetric analysis(TGA/DTA),scanning electron microscopy(SEM),Fourier-Transform Infrared spectroscopy(FTIR),Raman spectroscopy,X-ray diffraction(XRD)and X-ray absorption spectroscopy(XAS).Asphaltene testified to be a better precursor for catalytic hydrothermal gasification leading to 11.97 mmol/g of total gas yield compared to petroleum coke(8.04 mmol/g).In particular,supercritical water gasification using 5 wt%Ni/AC at 650°C with 15 wt%feed concentration for 60 min resulted in 4.17 and 2.98 mmol/g of H_2from asphaltene and petroleum coke,*** the same conditions,the respective CH_4yields from catalytic gasification of asphaltene and petroleum coke were 2.54and 1.07 mmol/***,asphaltene also seemed to an attractive feedstock for the production of highly aromatic chars through hydrothermal gasification.

关键词： Asphaltene Petroleum coke Subcritical water Supercritical water Gasification Char

Heating and melting mechanism of stainless steelmaking dust pellet in liquid slag

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Journal of Central South University of Technology 2007年第1期14卷 32-36页

作者：彭及唐谟堂彭兵余笛 J. A. kozinski 唐朝波 School of Metallurgical Science and Engineering Central South University School of Information Science and Engineering Central South University Department of Metallurgical Engineering McGill University3610 University StreetMontrealH3A 2B2Canada

The heating and melting mechanisms of the pellets immersed in liquid slag were investigated, and the effect of the pellet heating and the melting conditions were studied. The results show that the dust component in the pellet is melted from the surface and no metallic elements are melted before the dust component, the time for the pellet completely melted is reduced as the iron powder content increases since the metallic iron has high thermal conductivity. These are four stages of heating and melting of pellet in liquid slag, they are the growth and melt of solid slag shell, penetration of liquid slag, dissolving of dust component and melting of reduced metals. The lifetime of the solid slag shell is in the range of 7-16 s and increasing the pre-heating temperature of the pellet and the slag temperature can shorten the slag shell lifetime. The time for the dust component in the pellet to be melted completely is in the range of 20-45 s and increasing the pre-heating temperature, especially in the range of 600-800 ℃, can obviously reduce the melting time. A higher slag temperature can also improve the pellet melting and the melting time is reduced by 10-15 s when the slag temperature is increased from 1 450 to 1 550 ℃. The pellet with higher content of iron powder is beneficial to the melting by improving the heat conductivity.

关键词： heating melting mechanism stainless steelmaking dust recycling

Thermodynamic calculation on the smelting slag of direct recycling of electric arc furnace stainless steelmaking dust

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Journal of Central South University of Technology 2003年第1期10卷 20-26页

作者：彭兵彭及 Janusz A.kozinski Jonathan Lobel 柴立元张传福陈为亮 SchoolofMetallurgicalScienceandEngineeringCentralSouthUniversity DepartmentofMetallurgicalEngineeringMcGillUniversity

Thermodynamic calculation on the smelting slag of direct recycling of electric arc furnace stainless steelmaking dust was presented. An induction furnace was used to simulate electric arc furnace smelting to recover the metals from the dust. The elements of iron, chromium and nickel in the ingot and the components of metal oxides in the slag were analyzed. The thermodynamic model for FeO Cr 2O 3 MgO SiO 2 slag was set up and the active concentrations of substances in the slag at 1 550 ℃ were determined by thermodynamic calculation according to the experimental data. The results show that the apparent equilibrium constant and quantitative distribution of chromium between slag and steel are unstable and affected by the mass ratios of pellets to start iron and metal reducing agent to the pellets. In order to get satisfactory chromium recovery from the direct recycling of electric arc furnace stainless steelmaking dust, it is important to ensure the mass ratio of pellets to the steel below 0.20 and the mass ratio of metal reducing agent to pellets over 0.18 in practical smelting runs.

关键词： thermodynamic calculation stainless steelmaking dust reduction recycling

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电弧炉粉尘球团直接还原的热传导模型

上海金属 2000年第5期22卷 9-13页

作者：彭兵张传富彭及 JonathanLobel janusza.kozinski 中南工业大学长沙410083 McGillUniversity

对电弧炉炼钢粉尘加上还原剂碳混合制粒成的球团还原过程的热传导行为进行了研究 ,根据实验推导了球团导热模型的结构参数。

关键词：热传导模型电弧炉粉尘球团直接还原

不锈钢电弧炉粉尘加热过程的TGA及FTIR分析

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北方工业大学学报 2002年第3期14卷 38-43页

作者：彭兵张传福彭及柴立元 Neil Souza Jonathan Lobel janusza.kozinski 中南大学冶金科学与工程系湖南长沙410083 Dept.of Metallurgical Eng. McGillUniv.3610 University StreetMontrealQCCanada H3A 2B2

本研究采用热重分析仪 ( TGA)和傅里叶变换远红外气体分析仪 ( FTIR)检测了不锈钢电弧炉粉尘的加热过程 ,确定了加热过程中粉尘热性质变化的 3个阶段 .第 1阶段表现为失重 ,它是由水分的蒸发以及粉尘中的游离碳与金属氧化物作用所致 .... 详细信息

本研究采用热重分析仪 ( TGA)和傅里叶变换远红外气体分析仪 ( FTIR)检测了不锈钢电弧炉粉尘的加热过程 ,确定了加热过程中粉尘热性质变化的 3个阶段 .第 1阶段表现为失重 ,它是由水分的蒸发以及粉尘中的游离碳与金属氧化物作用所致 .第 2阶段表现为增重 ,粉尘中的金属与空气中的氧发生氧化反应 .第 3阶段为缓慢失重过程 ,粉尘中部分金属挥发进入气相 .研究结果可为不锈钢电弧炉粉尘的直接回收及固化处理提供数据 .

关键词：不锈钢电弧炉粉尘加热过程 TGA FTIR