Analysis of hot metal desulfurization methods efficiency during titanomagnetite processing

2020 ◽  
Vol 76 (6) ◽  
pp. 543-549
Author(s):  
V. V. Panteleev ◽  
K. B. Pykhteeva ◽  
M. V. Polovets ◽  
K. V. Mironov ◽  
S. A. Zagainov
Keyword(s):  
Blast Furnace ◽  
Data Analysis ◽  
Sulfur Content ◽  
Slag Basicity ◽  
Slag Viscosity ◽  
Blast Furnaces ◽  
Hot Metal ◽  
Blast Furnace Smelting ◽  
Low Sulfur ◽  
Hot Metal Desulfurization

To make high-quality steel, it is necessary to ensure low sulfur content in the hot metal entering a steelmaking shop. The task to obtain low sulfur metal can be solved either during blast furnace smelting or its ladle desulfurization immediately after tapping out of blast furnace. Under conditions of JSC EVRAZ NTMK, the ladle desulfurization of vanadium hot metal is not applied, since it leads to a loss of vanadium. Is explained by the fat, that calcium oxide forms with V2O5 a strong calcium vanadate (3СаО·V2O5), which makes the process of vanadium recovery during further slag processing more complicated. Therefore the ladle desulfurization is accomplished after devanadation of hot metal. After the devanadation the semi-product has ions of oxygen, which makes it impossible to arrange an effective desulfurization and males it necessary to smelt the hot metal with limited sulfur content. The factors, effecting the process of hot metal desulfurization in a blast furnace, including slag basicity, MgO content in it, temperature of smelting products and slag viscosity, are presented. Dependence of distribution coefficient of sulfur on slag basicity has been shown. Research goal is pig iron desulphurization efficiency estimation by means of MgO increasing in slag. Data analysis findings about smelting products composition over 500 tappings for each of two investigated JSC EVRAZ NTMK blast furnaces have been reported. The aim of the study was comparison of hot metal desulphurization efficiency due to both slag basicity increase and MgO increase in slag. Results of data analysis on smelting products composition of over 500 heats for each of two investigated JSC EVRAZ NTMK blast furnaces have been presented. It was established that a sulfur content decrease in hot metal is achieved more effectively by MgO increase in slag. It has been shown that MgO has better desulfurizing properties, and with an increase of its content in the blast furnace slag, the overall technology for running the blast furnace process improves. It was recommended to increase the consumption of materials containing MgO while maintaining basicity at a constant level. Such a technology will allow to decrease sulfur content in hot metal, as well as will result in the process stabilization providing other conditions being equal.

scholarly journals Analysis of possible ways to reduce sulfur content in pig iron

2021 ◽  
Vol 63 (11-12) ◽  
pp. 878-882
Author(s):  
S. V. Myasoedov ◽  
S. V. Filatov ◽  
V. V. Panteleev ◽  
V. S. Listopadov ◽  
S. A. Zagainov
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Sulfur Content ◽  
Sulfur Removal ◽  
Slag Basicity ◽  
Slag Viscosity ◽  
Pig Iron ◽  
Blast Furnace Smelting ◽  
Coal Fuel ◽  
Slag Yield

One of the ways to increase the energy efficiency and intensity of blast furnace smelting, especially when using pulverized coal fuel, is to increase the hot strength of coke. In the conditions of OJSC NLMK, an oil additive was introduced into the coal charge to improve the coke quality. At the same time, sulfur content in the coke increases, and, consequently, sulfur content in the cast iron increases as well. In this regard, the task of finding ways to improve the desulfurization of cast iron in blast furnace becomes urgent. The main factors determining the desulfurization of cast iron are slag basicity, content of MgO oxide in it, temperature of the smelting products, and the slag viscosity. The purpose of this work was to compare the efficiency of sulfur removal by increasing the slag basicity and MgO content. On the basis of wellknown equations, an algorithm was developed that allows the problem to be solved. It was established that an increase in MgO content in the slag promotes desulfurization of cast iron to a greater extent than a basicity increase. In addition, an increase in MgO content by 1 % is accompanied by an increase in slag yield by 3.0 – 3.5 kg/t of cast iron. At the same time, an increase in basicity by 0.01 leads to an increase in the slag yield by 4 – 5 kg/t of pig iron. Consequently, reducing the sulfur content in pig iron by increasing the slag basicity requires less heat. In terms of the specific consumption of coke, difference in heat demand is 0.4 – 0.5 kg/t of pig iron. It is shown that with an increase in MgO content in the slag, the slag viscosity at a temperature of 1450 °C increases to a lesser extent than with an increase in basicity.

Application in the Experimental Data Analysis of the Slag Viscosity with Minitab Software

2013 ◽  
Vol 753-755 ◽  
pp. 1857-1861
Author(s):  
Shu Qing Zhang ◽  
Xiu Ling Lv ◽  
Li Hong Zhang ◽  
Na Hui Zhang
Keyword(s):  
Experimental Data ◽  
Blast Furnace ◽  
Data Analysis ◽  
Blast Furnace Slag ◽  
Slag Basicity ◽  
Slag Viscosity ◽  
Chemical Compositions ◽  
Single Factor ◽  
Experimental Data Analysis ◽  
Furnace Slag

The single factor variance of viscosity experimental data of blast furnace slag was calculated by Minitab software. The influence of slag basicity and chemical compositions on the slag viscosity was obtained. The results show that there have insignificant effects on the slag viscosity when the slag basicity is over than 1.02, MgO content is less than 11.95% or TiO2 content is less than 12.57%. While the slag basicity can be influenced significantly with the slag basicity less than 1.02, MgO content over than 13.95% and TiO2 content over 13.57%. The Al2O3 content of the slag should be less than 12.75%.

Prediction of Blast Furnace Thermal State in Real-Time Operation

2020 ◽  
Vol 299 ◽  
pp. 518-523
Author(s):  
Nikolay Spirin ◽  
Oleg Onorin ◽  
Alexander Istomin
Keyword(s):  
Blast Furnace ◽  
Gas Flow ◽  
Thermal State ◽  
General Description ◽  
Blast Furnaces ◽  
Hot Metal ◽  
Blast Furnace Smelting ◽  
Transition Processes ◽  
Control Actions ◽  
Time Operation

The paper gives a general description of the dynamic model of the blast-furnace process that enables to calculate transition processes of the blast furnace thermal state, evaluated by the content of silicon in hot metal. It provides calculation results of the transition processes to be subjected to changes in control actions: ore load from the top and oxygen concentration in blast, natural gas flow rate and hot blast temperature from the bottom. Specific features of these transition processes during blast-furnace smelting are analyzed. The paper shows that the dynamic characteristics of blast furnaces change are subjected to control actions and depend significantly on properties of melted raw materials and operating parameters of blast furnaces. The oscillatory transition process in the blast furnace is observed in the case after disturbance it has an opposite influence on the thermal state of the lower and uppers stages of heat exchange. The paper presents prediction results of the silicon content in hot metal. It gives practical recommendations for selection of control actions.

Blast-furnace smelting with the production of low-silicon hot metal

2013 ◽  
Vol 43 (8) ◽  
pp. 503-507 ◽  
Author(s):  
S. V. Filatov ◽  
I. F. Kurunov ◽  
L. A. Smirnov ◽  
V. A. Kobelev ◽  
O. P. Onorin
Keyword(s):  
Blast Furnace ◽  
Hot Metal ◽  
Blast Furnace Smelting ◽  
Furnace Smelting

scholarly journals Effect of Basicity and Al2O3 on Viscosity of Blast Furnace Slag and Thermodynamic Analysis

2021 ◽  
Author(s):  
Jian Zhang ◽  
Zhengjian Liu ◽  
Jianliang Zhang ◽  
Cui Wang ◽  
Hengbao Ma ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Blast Furnace ◽  
Constant Temperature ◽  
Slag Basicity ◽  
Al2o3 Content ◽  
Wave Number ◽  
Slag Viscosity ◽  
Slag Structure ◽  
Slag Temperature

With the increased use of laterite nickel ore, the impact of high Al2O3 slag on blast furnace smelting has gradually increased. In this paper, the effects of slag basicity and Al2O3 content on slag viscosity and enthalpy change under constant temperature conditions was investigated. The changes in slag structure were analyzed by activation energy and Fourier Transform Infrared (FT-IR) spectroscopy. The relationship between slag components and slag temperature and viscosity when slag heat is reduced was investigated. The results showed that the viscosity first slightly decreased and then significantly increased with increasing basicity at constant temperature. With the addition of Al2O3 content, the viscosity of the slag increases. The activation energy increases with increasing slag basicity and Al2O3. With increasing basicity, the [SiO4]4- tetrahedral unit trough depth becomes shallow, the [AlO4]5- asymmetric stretching band migrates to lower wave numbers, and the slag structure depolymerizes. With the increase of Al2O3 content, the trough of [SiO4]4- tetrahedra deepens and the center of the symmetric stretching band moves to a higher wave number. The [AlO4]5- asymmetric stretching band becomes obvious, indicating the complexity of the slag structure. When the heat decreases, the slag temperature increases as the basicity increases, and the slag thermal stability is better at the basicity of 0.95-1.05. As the Al2O3 content increases, the thermal stability of the slag becomes worse.

scholarly journals COMPUTER SYSTEM OF CONTROL OF SLAG MODE IN MODERN blast furnace conditions

2020 ◽  
pp. 373-377
Author(s):  
Daria Tohobytska ◽  
Alla Bielkova ◽  
Dmytro Stepanenko ◽  
Yurii Likhachov ◽  
Oleksandr Skachko
Keyword(s):  
Blast Furnace ◽  
Computer System ◽  
Slag System ◽  
Slag Viscosity ◽  
Melting Points ◽  
Blast Furnace Smelting ◽  
Functional Capabilities ◽  
Slag Regime ◽  
Furnace Slag ◽  
Furnace Smelting

The functional capabilities, methodological foundations and information software of a modernized computer system for controlling the slag regime of blast furnace smelting, developed at the Institute of Ferrous Metallurgy on the basis of fundamental principles in the physicochemical and mathematical modeling of metallurgical melts and systems based on the concept of directional chemical bonding, are considered. The system provides a predictive calculation of the complex of technological properties of the final blast furnace slag: viscosity, melting points, enthalpy, and desorption capacity. Operational assessment of the slag regime using the Slag system as part of the process control system allows efficiently and up-to-date solving the problems of optimizing the slag regime and pig iron quality under unstable blast furnace conditions

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