11th International Symposium on High Temperature Metallurgical Processing: Fundamentals of Metallurgical Processes
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
Tuesday 8:30 AM
February 25, 2020
Room: 12
Location: San Diego Convention Ctr
Session Chair: Baojun Zhao, University of Queensland; Morsi Mahmoud, King Fahd University of Petroleum and Mineral
8:30 AM Introductory Comments
8:45 AM
Phase Equilibria in the System Al2O3-MnO-SiO2: Thermodynamic and Application: Yunhui Hua1; Baojun Zhao1; 1University of Queensland
Al2O3-MnO-SiO2 is an important base system related to steelmaking, silicomanganese production and lithium ion battery treatment. Phase equilibria in this system have been extensively and repeatedly studied since 1934 due to significant discrepancies. The early experimental studies were carried out under nitrogen gas flow which was considered as inert atmosphere. Recent studies showed that nitrogen can dissolve into the oxide melts causing different liquidus temperatures and compositions. Clearly the experimental data and system have to be identified to be N-containing and N-free for various applications. Careful experiments and comparison of experimental techniques explained the discrepancies in this system reported by different researchers. Thermodynamic modeling calculations are also performed for the N-containing and N-free systems to demonstrate the importance in selection of the parameters.
9:05 AM Cancelled
Thermodynamic Analysis of Chlorination of Zinc-bearing Phases in Pyrite Cinder: Deqing Zhu1; Dingzheng Wang1; Congcong Yang1; Jian Pan1; Hongyu Tian1; Yuxiao Xue1; 1Central South University
Thermodynamic analysis of chlorination of zinc-bearing phases in pyrite cinder was conducted by FactSage thermochemical software. The effects of temperature and main components of pyrite cinder on the chlorination of ZnO and ZnFe2O4 were studied. The results show that the presence of CaO and MgO has no effect on the chlorination of ZnO while the starting chlorination temperatures of ZnO decrease from 1525°C to 1200, 950, 850°C with the presence of Fe2O3, SiO2 and Al2O3, respectively. In contrast, the presence of Fe2O3 and MgO has no effect on the chlorination of ZnFe2O4 while the starting chlorination temperatures of ZnFe2O4 change from 1350°C to 825, 1075, 1525°C with the presence of SiO2, Al2O3 and CaO, respectively. The thermodynamic analysis is consistent with the experimental results available in literature.
9:25 AM Cancelled
Numerical Simulation Study of Arrangement Height and Angle of Rotary Hearth Furnace Burner: Yang Wang1; 1Chongqing University
Based on the problem of the height and angle of the burner setting of a rotary furnace in a steel plant,the three-dimensional model was built using ANSYS software to simulate the influence of the burner on the temperature field and flow field in the rotary hearth furnace at different heights and different inclination angles.The results show that the lower the height of the burner, the more uneven the temperature distribution of the reduction section, and the phenomenon that the local temperature is too high;the smaller the inclination angle of the burner, the lower the utilization rate of reduced carbon, and the local temperature is too high in the reduction section.By comparing the simulation results, a reasonable arrangement height and angle are obtained to provide reliable data for the production of the rotary hearth furnace.
9:45 AM Cancelled
Estimation of Thermodynamic Properties of Sodium Magnesium Silicates by Polyhedron Method: Zhongping Zhu1; Jinxiang You1; Xin Zhang1; Jian Wang1; Jiaoyang Duan1; Tao Zhang1; Zhiwei Peng1; T Jiang1; Mingjun Rao1; 1Central South University
Sodium salt-assisted roasting is a common activation method for the utilization of serpentine-bearing iron ores, e.g. laterite and ludwigite ore, along with the formation of sodium magnesium silicates. However, the lack of thermodynamic data of sodium-magnesium silicates hinders the corresponding thermodynamic analysis of the involved chemical reactions during the roasting process. Hence, different approaches for thermodynamic calculation were compared and evaluated in this work, and polyhedral method was finally determined to be an optimal method. Standard enthalpy, entropy, Gibbs free energy and molar hear capacity for the formation of five different sodium-magnesium silicates (Na2MgSiO4, Na2Mg2Si2O7, Na4Mg2Si3O10, Na2MgSi4O10, Na2Mg2Si6O15) were obtained through calculation, which provides a foundation for the evaluation of reaction possibility and priority.Keywords: sodium magnesium silicates, polyhedral method, standard formation enthalpy, entropy, molar heat capacity.
10:05 AM Cancelled
Effect of Al and Ca Content on the Behavior of the Inclusion in High Grade 304 Type Stainless Steel: Tongsheng Zhang1; Hualong Zhang1; Wanlin Wang1; Liwen Xue1; Shifan Dai1; Guomin Ying1; 1Central South University
High-grade stainless steel products, such as 2A, BA, 8K grade mirror plate, have high requirements on surface quality. However, there are always defects in the final products such as surface line-scale defect and point-shape defect caused by the inclusions. Unreasonable calcium treatment process can deteriorate the quality of the final product, rather than improve it. However, the thermodynamics and kinetic researches on the inclusions in stainless steel are limited until now. Based on that, the experiment, thermodynamics and kinetic researches were conducted in current work. The researches can quantify the following: (1) the composition, morphology and size distribution of inclusions in melts, (2) the stability diagrams of the complex system at 1873K, (3) the evolution process of the inclusions in the complex system during solidification process. The thermodynamic and kinetic models are in good agreement with experimental results.