11th International Symposium on High Temperature Metallurgical Processing: CANCELLED: Sintering and Pelletizing
Sponsored by: TMS Extraction and Processing Division, TMS: Pyrometallurgy Committee
Program Organizers: Zhiwei Peng, Central South University; Jiann-Yang Hwang, Michigan Technological University; Jerome Downey, Montana Technological University; Dean Gregurek, RHI Magnesita; Baojun Zhao, Jiangxi University of Science and Technology; Onuralp Yucel, Istanbul Technical University; Ender Keskinkilic, Atilim University; Tao Jiang, Central South University; Jesse White, Kanthal AB; Morsi Mahmoud, King Fahd University Of Petroleum And Minerals
Thursday 8:30 AM
February 27, 2020
Room: 16A
Location: San Diego Convention Ctr
Session Chair: Guanghui Li, Central South University; Mingming Zhang, ArcelorMittal Global R&D
8:30 AM Introductory Comments
8:45 AM Cancelled
Magnetite Carbon-free Sintering Process based on Electromagnetic Induction: Xuangeng Zhou1; Xuewei lv1; Zhongci Liu1; Mingrui Yang1; Gang Li1; Zihang Deng1; Yongda Li1; Linpei Li1; 1ChongQing Unversity
In order to reduce energy consumption and pollution in the existing sintering process, It was developed a carbon-free sintering process of magnetite based on electromagnetic induction. Compared with the existing sintering process, this new magnetite sintering process could achieve high thermal efficiency, with no coke added. It could reduce pollutant emission, e.g. COX, NOX, SOX. etc, decreasing energy consumption and ore return rate. In this study, we focus on the influences of iron powder addition amount, insulation time, insulation temperature and heating power on sinter. Moreover,through this new process, the sintered ore can be made to have good strength. It can be concluded by XRD analysis that the obtained product is the same as the existing sintered ore. In addition, it can be seen from the analysis of the mineral phase that the main phases of the obtained sintered ore are magnetite, olivine, calcium ferrite and residual iron powder.
9:05 AM Cancelled
Preparation of Metallized Pellets from Blast Furnace Dust and Electric Arc Furnace Dust Based on Microwave Impedance Matching: Lei Ye1; Zhiwei Peng1; Qing Ye1; Liancheng Wang1; Robin Augustine2; Lee Joonho3; Yong Liu4; Mudan Liu4; Mingjun Rao1; Guanghui Li1; Tao Jiang1; 1Central South University; 2Uppsala University; 3Korea University; 4Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources
Blast furnace (BF) dust and electric arc furnace dust (EAF) dust are two typical solid wastes of iron and steel industry. In order to overcome the shortcomings of traditional process, such as low metal recovery efficiency and high secondary pollution, microwave energy was applied in this study to intensify the self-reduction of core-shell BF dust-EAF dust composite pellets based on impedance matching for realizing highly efficient migration and separation of Fe, Zn, and Pb. By reducing the composite pellets in the microwave field, it was found that under the optimal conditions of proportion of EAF dust in shell to all of EAF dust in pellets of 20%, reduction temperature of 1000 °C, and dwell time of 15 min, metallized pellets with the total iron content of 68.73%, iron metallization degree of 95.87%, zinc removal rate of 88.78%, and lead removal rate of 94.38% were obtained.
9:25 AM Cancelled
Effect of Distributor Structure on the Uniformity of Multiphase System in Fluidized Ironmaking Process: Tao Wang1; Yan Liu1; Xiaolong Li1; Xuejiao Cao1; Ting-an Zhang1; 1Northeastern University
For the uneven gas-solid distribution in the process of fluidized bed ironmaking, the effect of distributor on gas-solid homogeneity in fluidized bed was investigated by using physical simulation. Statistical analysis, spectral analysis were used to study the pressure signal fluctuations in the fluidized bed with different perforated ratio of distributor, and the results were verified by optical analysis. The results show that the smaller perforated ratio of the distributor can reduce the bubble size of the whole bed and reduce the pressure fluctuation, so that the gas-solid dispersion is uniform, and the fluidization quality of the fluidized bed is improved. However, the distributor has a limited effect area, which has a great influence on the lower part of the fluidized bed. As the gas velocity and the height increase, the effect becomes weaker. Under the operating conditions of 100 L/min, the perforated ratio of 0.91% can reduce the pressure drop of the entire bed by 65%, which can reduce the pressure drop deviation in the lower part of the bed by more than 79%.
9:45 AM Cancelled
Prediction of Iron Ore Sinter Strength Using Statistical Technique: Zhongci Liu1; Xuangeng Zhou1; Gang Li1; Shanshan Wu1; Xuewei Lv1; 1Chongqing University
Sintered ore is the main iron-containing raw material for blast furnaces. As iron ore resources are gradually depleted, the types of raw materials for sinter are complicated, so their chemical composition often changes. At present, the common method for studying the sintering performance of iron ore is the sintering pot test. This method is cumbersome and has a long process time, and it is impossible to recognize the rapid reaction change of the raw material. Therefore, a prediction model was established by building a sintering experimental database and using statistical analysis methods such as correlation, regression and sequence quadratic programming analysis to analyze the relationship between the chemical composition and the tumbler strength of sinter, so as to simplify the sintering blending technology. The regression coefficient of the model is 0.803, indicating that the model has good prediction potential for sinter strength.
10:05 AM Cancelled
Reduction Behavior of In-flight Fine Hematite Ore Particles by CO+H2 Mixtures in a High-temperature Drop Tube Furnace: Liyong Xing1; Yingxia Qu1; Fanchao Meng1; Chunsong Wang1; Zongshu Zou1; 1Northeastern University
The ironmaking processes that directly use the raw materials of iron ore fines are expected to significantly reduce energy consumption, carbon dioxide emission and have great advantages in iron ore resource utilization. In this paper, the reduction behavior of the in-flight fine hematite particles in CO and H2 mixture atmosphere is studied with a modified high-temperature drop tube furnace. The kinetic mechanism of the gas-solid reduction of hematite ore fines is determined in the temperature range of 1450K~1550K. The particle size is 53~64 μm and the reaction time is less than 2 s. The effect of carbon monoxide concentration in the gas mixture on the reaction rate is examined. Based on the kinetic analysis and the morphology observation, the unreacted shrinking core model is used as the mathematical description for the reduction mechanism. The reaction rate equation is obtained and the calculated results are in good agreement with the experimental results.