scholarly journals Complex of methodologies and laboratory equipment for determination of coke and slags properties in smelting zone of blast furnace

2019 ◽  
Vol 75 (2) ◽  
pp. 182-188
Author(s):  
M. I. Stukov ◽  
A. Yu. Chernavin ◽  
V. A. Kobelev ◽  
D. A. Chernavin ◽  
K. P. Ivashinenko
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Carbon Materials ◽  
Raw Materials ◽  
Softening Temperature ◽  
Slow Heating ◽  
Electric Resistance ◽  
Air Blast ◽  
Reduction Treatment

Information about character of burden materials behavior inside a blast furnace at its different horizons enables to increase control efficiency of BF heat running. The elaborated complex of methodologies for carbon materials and iron ore raw materials properties study enables to simulate their behavior at the horizon of iron ore materials reducing, in the viscoplastic zone, at the horizon of iron ore raw materials smelting and its interaction with coke filling. A vertical electric resistance shaft furnace with a tube carbon heater was used as a base equipment for simulation of burden behavior in the reduction zone and smelting zone, as well as for simulation of iron ore burden melt outflow through coke filling. Burden materials preparation to the experiment concluded in crushing of iron ore component followed by 3–5 mm fraction extraction and a mixing it with 3–5 mm fraction of brown coal semi-coke in relation 2:1 for further heating-reduction treatment. The heating-reduction treatment of the mixture charged in the electric furnace simulates the reducing zone and is carried out by a slow heating of the iron ore component and reducing agent mixture from 20 up to 980–1020 ºС. The methodology of determination of lump carbon materials combustibility in the highly heated air blast flow was developed for the complex of equipment based on the shaft electric resistance furnace and aimed at testing of burning process of carbon samples of technological fuels. The combustibility was determined under conditions of burnt sample heating in the temperature range from 500 up to 1500 °C with an accuracy of ±10 °С. The temperature of air blast flow (21 % vol. of oxygen at natural moisture) was set in the range from 120 up to 1200 °С and was kept with an accuracy of ±12 °С. The burnt sample mass, volume of air blast and its velocity was correlated to obtaining of complex non-dimensional Re factor (Reinolds number) more than 100, that guaranteed a reliable process running in the combustion area with no risk of transferring to gasification process. Based on GOST 26517–85 (“Iron ores, sinter and pellets”) a methodology was elaborated for determining of parameters of iron ore materials status in the viscoplastic zone. The methodology comprises heating of preliminary reduced sample of a tested iron ore material in an inert gas and determination of softening temperature and smelting end by a hard rod sinking into the material layer under external pressure action. The temperature at which the layer shrinkage reaches level of 2% during heating, was taken as the softening temperature of the iron ore material. The sinking of the rod into the material by 80% was taken as the temperature of the beginning of the material melting. The interval softening-melting was determined as the difference between melting temperature and softening temperature (at sample shrinkage by 2 %).

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.

scholarly journals Flame Photometric Determination of Alkali Elements in Raw Materials and By-product of Blast Furnace

1956 ◽  
Vol 4 (3) ◽  
pp. 14-22
Author(s):  
Ryohei ISHIDA ◽  
Yoshimasa FUJISHIRO ◽  
Hayata MANAKA ◽  
Yujiro HASHIMOTO ◽  
Hironori KANEKO
Keyword(s):  
Blast Furnace ◽  
Raw Materials ◽  
Photometric Determination ◽  
Alkali Elements

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.

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