Blast-furnace foreman ? Organizer of pig-iron smelting with a low coke consumption

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.

Download Full-text

Reduction in the loss of pig iron with blast-furnace slags

Metallurgist ◽

10.1007/bf00738947 ◽

1986 ◽

Vol 30 (12) ◽

pp. 431-433

Author(s):

I. I. Shestopalov ◽

V. V. Mosiashvili ◽

V. V. Parastashvili ◽

D. N. Gobedzhishvili ◽

V. I. Varava ◽

...

Keyword(s):

Blast Furnace ◽

Pig Iron

Download Full-text

Present Situation of Producing Pig Iron with Low Silicon Content in Blast Furnace and Operational Problem to Be Solved

Tetsu-to-Hagane ◽

10.2355/tetsutohagane1955.69.16_1945 ◽

1983 ◽

Vol 69 (16) ◽

pp. 1945-1954 ◽

Cited By ~ 4

Author(s):

Nobuo TSUCHIYA ◽

Seiji TAGUCHI

Keyword(s):

Blast Furnace ◽

Silicon Content ◽

Present Situation ◽

Pig Iron ◽

Operational Problem

Download Full-text

Coke consumption in the blast furnace

Steel in Translation ◽

10.3103/s0967091214110072 ◽

2014 ◽

Vol 44 (11) ◽

pp. 824-828

Author(s):

E. G. Donskov ◽

V. P. Lyalyuk ◽

A. D. Donskov

Keyword(s):

Blast Furnace ◽

Coke Consumption

Download Full-text

Glassy blast furnace pig iron and design of other glassy compositions using thermodynamic calculations

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2018.01.029 ◽

2018 ◽

Vol 484 ◽

pp. 95-104 ◽

Cited By ~ 5

Author(s):

N. Mahata ◽

A. Banerjee ◽

P.K. Rai ◽

P. Bijalwan ◽

A.S. Pathak ◽

...

Keyword(s):

Blast Furnace ◽

Thermodynamic Calculations ◽

Pig Iron

Download Full-text

Production of SG Grade Pig Iron in Mini Blast Furnace

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.3174 ◽

2013 ◽

Vol 634-638 ◽

pp. 3174-3180

Author(s):

Madan Mohan Mahato ◽

Mahesh Kumar Agrawal ◽

Sharda Nand Sinha

Keyword(s):

Blast Furnace ◽

Metallurgical Coke ◽

Chemical Compositions ◽

Pig Iron ◽

Hot Metal ◽

Efficient Operation ◽

Demand And Supply ◽

Slag Chemistry ◽

Capital Intensive

The entire life of a Blast furnace operator is spent to achieve the following aims: • To increase the productivity of Blast Furnace as high as possible. • To decrease the coke rate as low as possible to produce unit ton of hot metal. • To produce the hot metal of superior SG quality with particular reference to Sulphur & Silicon. • To keep the production cost as low as possible. The process indices of Mini Blast Furnace are similar to that of a conventional blast furnace. But, conventional blast furnace is capital intensive, solely dependent on good quality metallurgical coke, the gestation period is longer, and requires elaborate burden preparation. There is huge gap between demand and supply of steel in India. Also, India is dreaming to become developed nation by 2020. In such situations, the role of Mini Blast Furnace becomes very important. The slag chemistry is an important parameter to improve the process indices of MBF. The slag chemistry includes its chemical composition, liquidus temperature, fluidity, Sulphide capacity etc, which has an important bearing on the smooth & efficient operation of the MBF. The main important constituent of SG grade pig iron, particularly, Sulphur & silicon content should be 0.040% maximum and 1.20% to 2.20% maximum respectively. The chemical compositions of SG Grade Pig Iron is C- 3.80-4.20%, Mn – 0.35- 0.80%, Si – 1.20- 2.20%, S - 0.040% maximum and P – 0.15% maximum. The role of slag to produce such a low sulphur & low silicon in Mini Blast Furnace is very important. Therefore, to control Sulphur and silicon in SG Grade Pig Iron in Mini Blast Furnace, the optimisation of Slag Chemistry is an essential step.

Download Full-text

Reduction of Composite Pellet Containing Indonesia Lateritic Iron Ore as Raw Material for Producing TWDI

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.281.490 ◽

2013 ◽

Vol 281 ◽

pp. 490-495 ◽

Cited By ~ 6

Author(s):

Adji Kawigraha ◽

Johny Wahyuadi Soedarsono ◽

Sri Harjanto ◽

Pramusanto

Keyword(s):

Blast Furnace ◽

Iron Ore ◽

Raw Material ◽

Pig Iron ◽

Blast Furnace Process ◽

Composite Pellet ◽

Furnace Process ◽

Iron Phase ◽

Reductive Atmosphere ◽

Reduced Pellets

Blast furnace process is still an important process for producing pig iron. The process needs high grade iron ore and coke. The two materials can not be found easily. In addition blast furnace process needs cooking and sintering plant that produces polluted gases. Utilization of composite pellet for pig iron production can simplify process. The pellet is made of iron ore and coal. In addition the pellet can be made from other iron source and coal. This paper discusses the evolution of phase during reduction of composite pellet containing lateritic iron ore. Fresh iron ore and coal were ground to 140 mesh separately. They were mixed and pelletized. The quantity of coal added was varied from 0 %, 20 % and 29 % of pellet weight. Pellets were heated with 10 °C/minute to 1100 °C, 1200 °C, 1300 °C and 1350 °C in a tube furnace and temperature was held during 10 minutes. Heated pellets were analyzed with XRD equipment. XRD of reduced pellets showed that iron phase change with coal and temperature. Lack of coal during heating results the re-oxidation of iron phases. This process is due to replacement of reductive atmosphere by oxidative atmosphere.

Download Full-text