Advances in Pyrometallurgy: Furnace Containment: Poster Session
Sponsored by: TMS Extraction and Processing Division, TMS: Pyrometallurgy Committee, TMS: Process Technology and Modeling Committee, TMS: Materials Characterization Committee, TMS: Industrial Advisory Committee
Program Organizers: Gerardo Alvear Flores, CaEng Associates; Camille Fleuriault, Eramet Norway; Dean Gregurek, RHI Magnesita; Quinn Reynolds, Mintek; Hugo Joubert, Tenova Pyromet; Stuart Nicol, Glencore Technology; Phillip Mackey, P.J. Mackey Technology, Inc.; Jesse White, Kanthal AB; Isabelle Nolet, Hatch
Monday 5:30 PM
March 4, 2024
Room: Regency R
Location: Hyatt
Corrosion Behavior of MgO-C Refractory in the Electric Arc Furnace that Entirely Uses Direct Reduced Iron as Raw Materials: Zhuogang Pang1; Haibin Zuo1; 1University of Science and Technology Beijing
The corrosion behavior of MgO-C refractory in electric arc furnace (EAF) slags was investigated by adopting a rotating immersion method (25r/min) at 1823K. The EAF entirely uses direct reduced iron as raw materials, and the change of refractory radius, MgO content in slag, and contact angle were studied at various slag basicity conditions. The results showed that the reduction of radius diminished as the slag basicity increased from 1.6 to 2.47. The slag with higher basicity has a larger contact angle compared to lower basicity slags. In addition, the MgO solubility increased with a decrease in basicity and an extension of exposure time and subsequently stabilized after 60 min. The reduction of FeOx and the formation of a magnesiowüstite (MW) intermediate layer occurred within the refractory. The MW layer is thicker in cases of low-basicity slag, but the slag penetration is deeper, leading to severe erosion.
Corrosion of Alkali Metals on SiC-Si3N4 Refractory of Pusher Kiln: Ruixin Hu1; Jiang Diao1; Jinan Wang1; Deman Liu1; Wenfeng Tan1; Hongyi Li1; Bing Xie1; 1Chongqing University
When using pusher kiln to produce vanadium nitrogen alloy, alkali metals in raw materials will volatilize and deposit in the kiln, which will corrode refractories. In this paper, SiC-Si3N4 composite brick was used as the research object, and sodium carbonate and potassium carbonate were used as corrosion reagents to carry out corrosion experiments in a vacuum tube furnace. The results indicate that after 3 hours of corrosion of composite bricks with sodium carbonate or potassium carbonate, micropores appear on the surface and peel off. The thickness of spalling layer and corrosion layer caused by sodium carbonate is 3.0 mm and 2.67 mm, respectively. The thickness of spalling layer and corrosion layer caused by potassium carbonate is 0.5 mm and 0.77 mm, respectively. Combined with theoretical calculation and experimental characterization, it is found that the corrosion process is divided into three stages: corrosion reaction, slagging and reduction of alkali metal oxides.
Development of Prediction Criteria for Gas Channeling in Blast Furnace: Kratika Jain1; 1Indian Institute of Technology ( Indian School of Mines), Dhanbad
The gas channeling is uneven distribution of gas through burden layers in the blast furnace due to difference in permeability across the horizontal cross sectional area, which causes unusual operation of furnace. When it is not timely analyzed, channeling can lead to hanging, burden slippage and chilling of hearth. The objective of this work is to develop gas channeling prediction system based on statistical modeling by analyzing the real-time data for the parameters like stave temperature, pressure, gas utilization ratio and uptake temperature. First, the criteria indicative of the fluctuations in physical and chemical process parameters during channeling are obtained from theoretical understanding of the event with historical data of an operational furnace. The model is developed on python and optimum combinations of criteria are found through fine tuning of statistical parameters and cross validation with the pre-existing events. It is run on test dataset and the accuracy is determined.
Long Long-term Safety Work of 3 # Blast Furnace Hearth: YuZhu Pan1; 1Hunan ValinXiangtan Iron & Steel Co., Ltd.
The long-term safety work of the blast furnace hearth involves the safety and efficiency of blast furnace production. The damage to the blast furnace hearth is a huge disaster for enterprises and blast furnace producers. 3#blast furnace of Hunan ValinXiangtan Iron & Steel Co.,Ltd was put into production for 8 years, The carbon bricks in the hearth of 3# blast furnace are eroded, and the thickness of the carbon bricks is reduced. The safety production of the blast furnace is facing serious challenges. The technical managers successfully solved the contradiction between the production capacity, fuel consumption, and blast furnace safety by increasing the [Ti%] content of molten iron, reducing the tuyere area to increase blast energy, adjusting the charging system, and increasing the temperature of the molten iron.