Mineralogy and microstructure of skull varieties in blast furnace № 6 JSC EVRAZ NTMK

2020 ◽  
pp. 11-20
Author(s):  
V. A. Perepelitsyn ◽  
K. G. Zemlyanoy ◽  
K. V. Mironov ◽  
A. A. Forshev ◽  
F. P. Nikolaev ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Petrographic Analysis ◽  
Blast Furnaces ◽  
Vanadium Compounds ◽  
Genetic Types ◽  
Refractory Compounds ◽  
Ferrous Metals ◽  
Titanium Zinc ◽  
Metal Phases ◽  
Comprehensive Study

The results of a comprehensive study of the material composition and microstructure of 20 skull samples taken after blowing out blast furnace № 6 of EVRAZ NTMK JSC are presented. More than 30 minerals and metal phases of different chemical classes were diagnosed in the samples of the skull. Unlike the skull of blast furnaces of other metallurgical plants (NLMK, ZSMK), the skull of NTMK blast furnaces has an abnormally high content of titanium, zinc, vanadium compounds, as well as heavy non-ferrous metals and sulfur. On the basis of a detailed petrographic analysis, 5 structural and genetic types (varieties in composition and origin) of the garnice were identified. The varieties of the garnish contain a large amount of grenal, which is dominated by refractory compounds of titanium and vanadium carbonitrides of the general formula (Ti, V) (C, N).

A Comprehensive Review on Blast Furnace

2018 ◽  
Vol 4 (11) ◽  
pp. 6
Author(s):  
Upendra Kumar ◽  
Avinash Patidar ◽  
Bhupendra Koshti
Keyword(s):  
Blast Furnace ◽  
Metallurgical Coke ◽  
Waste Plastics ◽  
Blast Furnaces ◽  
Liquid Hydrocarbons ◽  
Comprehensive Review ◽  
Global Performance ◽  
Flow Heat ◽  
And Control ◽  
Recycled Waste

The design and control of blast furnace (BF) ironmaking must be optimized in order to be competitive and sustainable, particularly under the more and more demanding and tough economic and environmental conditions. To achieve this, it is necessary to understand the complex multiphase flow, heat and mass transfer, and global performance of a BF. In this paper injection of alternative reducing agents via lances in the tubers of blast furnaces is discussed to reduce the consumption of metallurgical coke. Besides liquid hydrocarbons and pulverized coal the injection of recycled waste plastics is possible, offering the opportunity to chemically reuse waste material and also utilize the energy contained in such remnants.

EFFECT OF AIR HEATING ON CONCENTRATION OF NITROGEN OXIDES IN COMBUSTION PRODUCTS OF GASEOUS FUELS

2020 ◽  
Vol 0 (10) ◽  
pp. 35-40
Author(s):  
S.I. Gertsyk ◽  
◽  
I.V. Belyakov ◽  
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Nitrogen Oxides ◽  
Combustion Products ◽  
Blast Furnaces ◽  
Natural Gases ◽  
Gaseous Fuels ◽  
Air Heating ◽  
Formation Probability ◽  
Oxide Concentration

The formation probability of nitrogen oxides in combustion products of mixed blast-furnace and natural gases under different conditions of combustion was calculated. It has been found out that heating the air incoming into burners of high-temperature blast-furnaces sharply increases concentration of nitrogen oxides in combustion products (by 1.5-1.75 times). It was notices that in furnaces where temperature was less than 950-1000 °С, heating the air up to 400 °С increased NOx content in gases released to the atmosphere no more than by 20-23%, and oxide concentration was in limits of sanitary standards.

Obtaining and investigation of a finely dispersed fraction of granulated blast-furnace slags for use as components of clinker-free binders

2021 ◽  
pp. 56-63
Author(s):  
B. B. Khaidarov ◽  
D. S. Suvorov ◽  
D. V. Lysov ◽  
A. K. Abramov ◽  
G. G. Luchnikova ◽  
...  
Keyword(s):  
Particle Size ◽  
Blast Furnace ◽  
Physicochemical Characteristics ◽  
Air Classification ◽  
Granulated Slag ◽  
Comprehensive Study

A method for obtaining a finely dispersed fraction of ground blast-furnace granulated slag has been developed. The resulting material with the introduction of an alkaline additive can be offered as an alternative to foreign analogous fine-dispersed mineral binders, an example of which can be microcement. A comprehensive study of granular slags of two metallurgical plants was carried out, the physicochemical characteristics of materials were determined. The possibility of obtaining a fraction of ground granular slag with a particle size of no more than 16 microns using vortex electromagnetic homogenization and subsequent air classification is shown.

scholarly journals Proper MgO/Al2O3 Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al2O3 Ratio Based on Observed Data

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 784
Author(s):  
Fengman Shen ◽  
Xinguang Hu ◽  
Haiyan Zheng ◽  
Xin Jiang ◽  
Qiangjian Gao ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Social Benefits ◽  
Blast Furnaces ◽  
High Quality ◽  
Diagram Analysis ◽  
Furnace Slag

With the gradual depletion of high-quality iron-ore resources, ironmaking blast furnaces have gradually shifted to using high-content Al2O3 iron ore. Under this condition, the addition of MgO in the slag is adopted to alleviate operation problems caused by the high content of Al2O3. However, the proper value of the MgO/Al2O3 ratio for blast-furnace slag systems (Al2O3 = 8–25%) is not systematically studied. In this paper, we discuss the proper MgO/Al2O3 ratio on the basis of blast-furnace slag systems under different Al2O3 contents. On the basis of thermodynamics and phase-diagram analysis, it could be concluded that: (1) the MgO/Al2O3 ratio is not limited when Al2O3 in slag is less than 14%, (2) the MgO/Al2O3 ratio is required to be in the range of 0.40–0.50 when Al2O3 in the slag is 15–17%, and (3) the MgO/Al2O3 ratio should be 0.45–0.55 when Al2O3 in the slag is larger than 18%. The proper MgO/Al2O3 ratio value has been established in various industries, and it has achieved significant economic and social benefits.

Deflocculant Polyplast 3MB-RC for unformed refractories

2020 ◽  
pp. 13-18
Author(s):  
A. A. Ponomarenko ◽  
I. V. Kormina
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Refractory Concrete ◽  
Physical And Mechanical Properties ◽  
Petrographic Analysis ◽  
Russian Company ◽  
Furnace Slag

The influence of the deflocculant of the Russian company Polyplast-UralSib LLC on the properties of the groove and selfdissolving masses for lining the working surfaces of thermal units is considered. It was found that when a deflocculant is introduced into the refractory concrete masses in an amount of 2.0 wt. % satisfactory workability of the mass and the required physical and mechanical properties of concrete after firing at 1000 and 1400 °C are ensured compared to the introduction of imported deflocculants ADW / ADS and SioxX / Siox-Quick. It is shown that the gutter concrete obtained using the Russian deflocculant has higher strength than concrete with an imported deflocculant, including 0.5 wt. % ADW1 and 0.5 wt. % ADS3. Petrographic analysis revealed equal resistance of the trench concrete to the effects of blast furnace slag when using Russian additives and imported SioxX and Siox-Quick in the amount of 2,0 and 0,5 wt. % as deflocculants respectively. Ill. 1. Ref. 26. Tab. 2.

Intensifying Smelting Synthesis Technique of 2500m3 Blast Furnace

2007 ◽  
Vol 561-565 ◽  
pp. 1031-1034
Author(s):  
Bin Chu ◽  
Yang Xiao ◽  
Pei Hua Tang
Keyword(s):  
Stainless Steel ◽  
Blast Furnace ◽  
Blast Furnaces ◽  
Synthesis Technique ◽  
Fuel Ratio

Based on the existing smelt condition, after exploring and practicing, 2500m3BF of the Stainless Steel Branch of Baosteel procured breakthrough on the intensifying smelting. By researching technologies of compounding many coke kinds for lessening the effect to the BF, adjusting the proportion of each ore to optimize the structure of charging, increasing the gas using ratio for cutting down fuel ratio, and taking low silicon smelting to optimize BF operation, the general indicators in the top position among the same type blast furnaces in china.

scholarly journals Prediction of the properties of blast furnace slag in modern conditions of blast furnaces of Ukraine

2018 ◽  
pp. 118-136
Author(s):  
D.N. Togobitskaya ◽  
A.I. Belkova ◽  
D.A. Stepanenko ◽  
N.A. Tsyupa ◽  
Yu.M. Likhachev
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Rapid Assessment ◽  
Operating Conditions ◽  
Integral Parameter ◽  
Blast Furnaces ◽  
Magnesia Content ◽  
The Individual ◽  
Management Recommendations ◽  
Furnace Slag

The aim of the work is the development of models for predicting the properties of final blast-furnace slags for the rapid assessment of the slag regime and the development of sound management recommendations when using various additives in the operating conditions of blast furnaces in Ukraine. A two-stage approach to calculating the properties of blast-furnace slag is proposed: according to the model of a “homogeneous” melt and taking into account its heterogeneity. A predictive model has been developed for calculating the viscosity of a «homogeneous» slag by including the integral parameter of the slag melt parameter e in the model structure, which takes into account the individual effect on the viscosity of each component of the slag composition. The current production data of the chemical composition of the final slag shows the effect of the magnesia content, alkaline compounds, basicity, Al2O3/MgO ratio on the calculated viscosity of the slags. For various operating conditions of blast furnaces, it has been shown that, due to incomplete combustion of coke and pulverized coal, the viscosity of slags increases by 1.5–2 times and their melting temperatures by 30–500C. Comparative analysis of the calculated properties of slag for different operating conditions of 3 furnaces in Ukraine confirms the appropriateness of using a complex of predictive models for the rapid assessment of the technological properties of slag, which makes it possible to choose a rational slag mode in modern conditions of blast smelting.

scholarly journals Numerical Simulation of the Raceway Zone in Melter Gasifier of COREX Process

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 867 ◽  
Author(s):  
Ye Sun ◽  
Ren Chen ◽  
Zuoliang Zhang ◽  
Guoxi Wu ◽  
Huishu Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Blast Furnace ◽  
Gas Flow ◽  
Chemical Processes ◽  
Blast Furnaces ◽  
Two Phase ◽  
Corex Melter Gasifier ◽  
Unsteady Numerical Simulation ◽  
Physical And Chemical ◽  
Shape And Size

The physical and chemical processes in the raceway zone of the COREX melter–gasifier express are similar to those inside the blast furnace. Based on the research achievements on blast furnaces, the unsteady numerical simulation of a gas-solid two-phase in the raceway was carried out by using computational fluid software. The formation process of the raceway in the COREX melter–gasifier was simulated. The shape and size of the raceway were obtained. Then, the effect of gas flow on the depth and height of the raceway was analyzed in this paper.

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