12th International Symposium on High Temperature Metallurgical Processing: Poster Session
Sponsored by: TMS Extraction and Processing Division, TMS: Pyrometallurgy Committee
Program Organizers: Zhiwei Peng, Central South University; Jiann-Yang Hwang, Michigan Technological University; Jesse White, Kanthal AB; 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; Morsi Mahmoud, King Fahd University Of Petroleum And Minerals
Monday 5:30 PM
February 28, 2022
Room: Exhibit Hall C
Location: Anaheim Convention Center
Session Chair: Ailiang Chen, Central South University; Ender Keskinkilic, Atilim University
F-4: Effect of Humic Acid-based Binder on the Properties of Vanadium-titanium Magnetite Oxidized Pellets: Jin Zhang1; 1Central South University
A new type of humic acid-based binder was tested as a substitute for bentonite to prepare qualified vanadium-titanium magnetite oxide pellets. The results show that there is strong chemical adsorption between the organic functional groups in the humic acid-based binder and the vanadium-titanium magnetite particles, which improves the strength of the green pellets. The thermal decomposition process of the humic acid-based binder will adversely affect the compressive strength and microstructure of the preheated pellets, but it has better thermal stability than other organic binders. Compared with bentonite binder, the microstructure of oxidized pellets is denser, and the recrystallization of the Fe2O3 crystal grains is better. Therefore, use the same quality of humic acid-based binders as other organic binders can replace 2% of bentonite, and contain more than 1% total iron. The results show that humic acid-based binders are promising and can effectively replace bentonite and other organic binders.
F-9: Phosphorus Migration Behavior in the Process of Converter Slag Gasification Dephosphorization: Chenxiao Li1; Yuekai Xue1; Shuai Tong1; Kaixuan Zhang1; 1North China University of Science and Technology
In order to realize the gasification dephosphorization process in converter slag splashing stage for avoiding the P enrichment, and the dephosphorized slag can be left for recycling in subsequent furnaces. The migration behavior of P during the slag gasification dephosphorization was studied. The results show that P element in converter slag is mainly enriched in silicate phase. The FeO in the converter slag is reduced by the coke into a large-diameter granular elemental Fe phase. The P2O5 in the slag is reduced by the coke at high temperature as P2 steam. Most of the P2 steam passes through the gas-slag interface and enters the furnace gas. A small part of the P2 steam will be adsorbed by the nearby elemental Fe phase to form iron phosphide.
F-10: Prediction Model of Calcium Addition in SPHC Steel Refining Process: Zhiqiang Du1; Nan Wang1; 1Northeastern University
Thecalcium treatment of SPHC liquid steel produced by a domestic steel plantwas studied in this paper.According to multiple linear regression mrthod,the predictionmodel of calcium addition with composition and temperature of liquid steel, soft stirringtimebyargon gasand top slag condition was established based on the industrial RH refining data. The results show that the hit rates of the two multiplelinearregression models with constant terms or notare 89.5% and 81.5%, respectively, and the multiple linear regression model with constant termhas better fitting ability and higherhit rate.The calcium additionmainly depends on the content of [Ca], [AlS], [AlT], and [S] in liquidsteel.Therefore, forthe actual calcium treatment process, it is need to accurately controlthe calciumadditionby combiningwith the liquid steelcomposition.
F-11: Simulation Study on Top Blowing Combustion in Iron Bath Smelting Reduction: Panfeng Wang1; Nan Wang1; 1Northeast University
Smelting reduction ironmaking process can use non coke coal powder and iron ore powder to smelt hot metal. It has the advantages of short process flow, less production investment and low energy consumption. It is a cutting-edge ironmaking technology in contemporary iron and steel industry. In this paper, the "upper space" combustion model of iron bath smelting reduction furnace is established by using numerical simulation method. the effects of different top oxygen lance position and oxygen enriched flow inlet angle on the combustion characteristics of furnace are studied. The temperature of flame increases with the increase of top lance position; With the increase of oxygen enriched gas flow rate, the temperature of combustion flame decreases. When oxygen enriched gas flow rate is 0.2kg/s, the temperature of upper space of furnace is the highest; The oxygen lance inlet angle is 10° The temperature increases from the furnace wall to the furnace.
F-12: Thermodynamic Study on Modification Converter Slag Using Hot Blast Furnace Slag: YuZhu Pan1; Dajun Luo1; Xiang Yuan1; Gaoming Liang1; Jingxin Wang1; Pengcheng Zhang1; 1Hunan ValinXiangtan Iron & Steel Co.,Ltd.
Due to the characteristics of converter slag, compared with blast furnace slag, it cannot be widely used in the building materials industry, which is an important issue for the development of Chinese steel companies. This paper uses FACTSage thermodynamic calculation software to study the conversion of converter slag by using the heat of blast furnace slag, and the research results provide a theoretical basis for improving the utilization rate of converter slag. The thermodynamic calculation results show that the molten blast furnace slag can absorb the free CaO and MgO in the slag through a variety of eutectic phase and peritectic phase melting reactions, and melt part or all of the high melting point Ca2SiO4; When the proportion of blast furnace slag is relatively high, the fluidity of the mixed slag can be maintained, which provides a guarantee for subsequent processing.