scholarly journals The researches of high-temperature properties of iron materials in laboratory conditions

2018 ◽  
pp. 64-79
Author(s):  
A.S. Nesterov ◽  
L.I. Garmash ◽  
K.P. Lopatenko ◽  
M.G. Boldenko ◽  
N.V. Gorbatenko ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Initial Period ◽  
Slag Formation ◽  
Integrated Method ◽  
Laboratory Conditions ◽  
Liquid Phases ◽  
Coke Layer ◽  
Slag Melt

The aim of the study is to simulate in laboratory conditions the behavior of iron ore materials in the zone of softening-melting DP and drip flow using an integrated method developed at the Institute of Ferrous Metallurgy. It is shown that the widespread idea of the formation in the blast furnace of primary slag melt based on FeO takes place mainly in the initial period of slag formation and is true for low basicity iron ore materials. For pellets, the nature of the formation of liquid phases differs significantly from the agglomerate. Experimentally established changes in the composition of the slag melt as heating. It is shown that under the conditions of temperature and heat treatment of raw materials, each temperature has its own composition of the liquid phase. When the pellets are melted, the primary melt is formed in the temperature range of 1330–13600C, in which the proportion of primary slag is 16–25%. Melt from high-silicon lumpy ore is formed at high temperatures of 1490-15200С. The mass of the primary slag with 42-48% FeO is 4-8% by weight of iron ore materials. The main part of the melt hangs on the coke nozzle on the coke layer at temperatures above 16000C. Melts formed from mixtures of iron-containing materials, as a rule, have averaged characteristics. The observed patterns make it possible to predict the behavior and properties of multicomponent charge mixtures in a blast furnace.

Adjustment of a technology of cast iron smelting in the blast furnace of jsc "ural steel" w ith a volume of 1232 см3 with charge h a v in g 95% share of Mikhailovskii GOK pellets

2021 ◽  
Vol 77 (7) ◽  
pp. 768-775
Author(s):  
I. F. Iskakov ◽  
G. A. Kunitsyn ◽  
D. V. Lazarev ◽  
А. А. Red`kin ◽  
S. A. Trubitsyn ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Raw Material ◽  
Material Base ◽  
Hot Metal ◽  
Charging System ◽  
Iron Smelting ◽  
Gas Consumption ◽  
A Charge

To use effectively internal raw material base, JSC “Ural Steel” accomplished I category major overhaul of the blast furnace No. 2. The main purpose of the overhaul was to design a rational profile which could ensure an ability to operate with a charge containing 95 % of Mikhailovskii GOK (mining and concentrating plant) pellets having basicity of 0.5 by CaO/SiO2. The blast furnace No. 2 having useful volume of 1232 m3, was constructed by design of Danieli Corus, the Netherlands, and was blown in on December 30, 2020. In the process of guarantee tests, step-by-step increase of Mikhailovskii GOK pellets (Fetotal = 60.5 %, CaO/SiO2 = 0.5) content in the charge iron ore part was being accomplished from 55 to 95.1%. Charging of the blend containing pellets in the amount of 55% of iron ore part, was done by charging system 4OOCC + 1COOCC (Ore - Coke) with filling level 1.5 m. Under conditions of pellets part increase in the blend, the charging system was changed to decrease their content at the periphery, to increase it in the ore ridge zone and make it intermediate between periphery and the ore ridge. At the pellets share in the iron ore raw materials 0.75 the charging system was used as the following: 3OOCC + 1COOC + 1COOCC, while at the content 95.1% the following charging system was used: 2COOC + 2COOC + 1COOCC. It was noted that in the period of guarantee tests the furnace running was smooth. The average silicon content in the hot metal was 0.70% at the standard deviation 0.666. Sulfur content in the hot metal did not exceed 0.024%, the blowing and natural gas consumption figures were 2100 m3/min and 11000 m3/min correspondently, oxygen content in the blowing 26.5%, hot blowing and top smoke pressure figures were 226.5 and 109.8 KPa correspondently. The productivity of the furnace was reached as high as 2358 t/day at the specific coke rate 433 kg/t of hot metal. After guarantee tests completion, the pellets content in the iron ore part was decreased gradually from 95 down to 50%. The decreasing was made by 5% in every 6 hours of operation. Application of the mastered technology of the blast furnace No. 2 with the increased share of pellets will enable to stably supply the blast furnaces No. 1, 3 and 4 by iron ore raw materials in the proportion of 30-35% of pellets and 65-70% of sinter.

Research on the Magnetizing Roasting and Magnetic Separation of Blast Sludge

2014 ◽  
Vol 644-650 ◽  
pp. 5451-5454
Author(s):  
Xu Bai ◽  
Shu Ming Wen ◽  
Shao Jun Bai ◽  
Chao Lv ◽  
Peng Xiang Zhang
Keyword(s):  
Experimental Study ◽  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Optimum Conditions ◽  
High Iron Content ◽  
Magnetic Current ◽  
Blast Furnace Production ◽  
Magnetizing Roasting ◽  
Roasting Time

In the blast furnace production process, the high iron content in the sludge produced by collecting, Iron can be used as recycled raw materials. Experimental study found that the use of magnetic roasting - weak magnetic iron powder method of recovering technology is feasible. The optimum conditions are: the grinding fineness is 87%, calcination temperature is 750 °C, roasting time is 25min, magnetic current is 1.5A under conditions to obtain a grade of 59% recovery rate of 79.3% iron ore .

Mathematical Model of Forecasting the Iron Ore Materials and Coke Quality Indicators

2011 ◽  
Vol 312-315 ◽  
pp. 1198-1203 ◽  
Author(s):  
A.N. Dmitriev ◽  
Yu.A. Chesnokov ◽  
G.Yu. Arzhadeeva ◽  
Yu.P. Lazebnaya
Keyword(s):  
Mathematical Model ◽  
Blast Furnace ◽  
Quality Indicators ◽  
Iron Ore ◽  
Coke Quality ◽  
Raw Materials ◽  
Blast Furnace Smelting ◽  
Furnace Technology ◽  
Furnace Smelting

The iron ore raw materials and coke quality is the basic reserve of improvement of blast furnace technology. Some of the quality indicators of iron ore raw materials and coke and their influence on the main parameters of the blast furnace smelting are considered in this paper.

Improvement of the technology for the production of pellets and new iron ore raw materials for modern blast-furnace smelting. Volume 1.

2019 ◽  
Author(s):  
Feleks Zhuravlev ◽  
Vitalii Lyalyuk ◽  
Nikolay Stupnik ◽  
Vladimir Morkun ◽  
Evgeny Chuprinov ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Blast Furnace Smelting ◽  
Furnace Smelting

The Coke and Iron Ore Materials Kinetic Characteristics and Quantitative Indicators of Blast Furnace Process

2012 ◽  
Vol 322 ◽  
pp. 87-106 ◽  
Author(s):  
A.N. Dmitriev ◽  
Yu.A. Chesnokov ◽  
G.Yu. Arzhadeeva
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Energy Costs ◽  
Blast Furnace Process ◽  
Blast Furnace Smelting ◽  
Furnace Process ◽  
General Energy ◽  
Quantitative Indicators ◽  
Furnace Smelting

The most important problem at the blast furnace process developing is the great coke consumption decreasing at the minimization of the general energy costs. One of the most effective ways of iron-making technical progress is the iron ore materials and coke physicochemical properties improvement which allows to increase the iron productivity and decrease the specific coke rate without construction of new blast furnaces and concentrating mills. Some of the quality indicators of iron ore raw materials and coke and their influence on the main parameters of a blast furnace smelting are considered in the paper.

Research of Titaniferous Ores Melting and Properties of Cast Iron and Slag

2019 ◽  
Vol 391 ◽  
pp. 221-225
Author(s):  
Andrey N. Dmitriev ◽  
R.V. Petukhov ◽  
G.Yu. Vitkina ◽  
E.A. Vyaznikova
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Chemical Composition ◽  
Iron Ore ◽  
Raw Materials ◽  
Scientific Research ◽  
Economic Indicators ◽  
Furnace Melting ◽  
Technical And Economic Indicators

Questions of melting of iron ore and raw materials with receipt of cast iron and slag are considered in vitro. The chemical composition of cast iron of slag is studied in vitro. The viscosity of slag is researched. Object of research - titaniferous ores with various contents of titan dioxide. The technical and economic indicators of a blast furnace melting an agglomerate and pellets (a consumption of coke and productivity, a chemical composition of cast iron and slag) received from a concentrate of the Kachkanarsky deposit are calculated. The technique of scientific research is used [1].

scholarly journals Study on the Manufacturing of Ultra-Fine Ore Briquettes for Charging in a Sintering Machine

2021 ◽  
Vol 59 (1) ◽  
pp. 14-20
Author(s):  
Jong-Ho Bae ◽  
Kang-Min Kim ◽  
Kyeong-Uk Lee ◽  
Jeong-Whan Han
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Firing Process ◽  
Optimal Size ◽  
Large Particle Size ◽  
Pocket Depth ◽  
Co2 Gas ◽  
Feeding Speed ◽  
The Republic

In ironmaking, the optimal size of the iron ore charged into a blast furnace is generally 10-30 mm. Oversized ores, which have a smaller reaction surface area, are crushed, while undersized ores, which decrease permeability, undergo a sizing process before being charged into the blast furnace. Recently, however, iron ore has been micronized, and there is less high-quality iron ore. Also, in accordance with the Paris climate change accord, the Republic of Korea must reduce CO2 gas emissions by about 39% before 2030 to conserve the environment. In response, steelmakers have researched a sinter-briquette complex firing process which employs a method of charging where the raw materials are sintered together with briquettes made of ultra-fine ore. Extra heat is needed to sinter the briquettes. If the briquettes are broken during transporting and charging, the sinter bed permeability decreases, which decreases productivity. In this study, briquettes were made by changing manufacturing conditions such as moisture content, feeding speed, and size, and were simulated by changing the pocket depth in a numerical analysis. Consequently, it was determined that the compressive strength of the briquette was highest when moisture in the briquette was 6 wt%, in proportion to feeding speed and large particle size. Briquette density was in inverse proportion to pocket depth, and when the depth was over 15 mm, the briquette was broken in the pocket.

Improvement of technology and equipment for the production of iron ore raw materials for modern blast-furnace smelting

2017 ◽  
Author(s):  
Vitalii Lyalyuk ◽  
Nikolay Stupnik ◽  
Feleks Zhuravlev ◽  
Evgeny Chuprinov ◽  
Irina Lyachova ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Blast Furnace Smelting ◽  
Furnace Smelting

Using a Mathematical Model of Counter-Current Flow in a Blast Furnace to Evaluate Reducibility of Iron-Ore-Bearing Raw Materials

2015 ◽  
Vol 86 (4) ◽  
pp. 320-328 ◽  
Author(s):  
Pavlina Pustejovska ◽  
Jiri Tuma ◽  
Vladimir Stanek ◽  
Jiri Kristal ◽  
Simona Jursova ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Blast Furnace ◽  
Iron Ore ◽  
Current Flow ◽  
Raw Materials ◽  
Counter Current Flow ◽  
Counter Current

scholarly journals Regularity reveal of joint sinter and pellets inflow from silo of chute type top charging device into the BF mouth space by physical simulation

2019 ◽  
Vol 75 (1) ◽  
pp. 37-47
Author(s):  
A. S. Kharchenko
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Physical Simulation ◽  
Raw Materials ◽  
Specific Rate ◽  
High Productivity ◽  
Rational Distribution ◽  
Laboratory Facility ◽  
Distribution Uniformity ◽  
Index Value

A uniform distribution of burden along blast furnace circumference is an important condition for its operation with high productivity and low coke specific rate. This condition is difficult to realize with bell-less charging device of chute type. To reveal rational regimes of burden components charging into the blast furnace mouth space providing most uniform inflow of the burden components by mass, a physical simulation was realized at a laboratory facility of compact bell-less charging device of chute type, manufactured in scale 1:5 relating the linear dimensions of the PAO MMK blast furnaces Nos 2, 4 and 6 charging devices. Succession the burden components charging was being changed by pellets and additional materials supply regimes into the cilo of the bell-less charging device. As a result of the simulation dependences of the burden rational distribution on the priority and uniformity of iron ore materials inflow from the burden cilo at pellets content in them from 10 till 90% were determined. The burden components rational charging regimes were revealed depending on the heat conditions. At blast furnace running with scull it is reasonable to charge the pellets into the lower part of the bell-less charging device cilo. This will provide their inflow into the nearwall area of the furnace mouth, that enables to eliminate the scull during the furnace running. At the pellets share of 50% of the burden iron ore part, by placing of them in the bell-less charging device cilo lower part and the chure moving from periphery to center, the peripherial zone of the furnace mouth will be formed from 82% of pellets and 18% of sinter. New regimes of iron ore materials elaborated, which enable to improve uniformity of their circumference distribution. The highest value of iron ore materials inflow mass uniformity index was registered at the following sequence of the burden components charging into the bell-less charging device cilo: 25% of sinter at the burden cilo bottom, next pellets and additional materials, next charging of the 75% left sinter. At the pellets content of 30–38% of iron ore raw materials, the distribution uniformity index value exceeded 0.75.

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