Means to cope with the higher alumina burden in the blast furnace

Agrawal, Ashish; Das, Kanak; Singh, Basant; Singh, Rohit; Tripathi, Vineet Ranjan; Kundu, Saurabh; Padmapal,; Ramna, R. V.; Singh, Manish Kumar

doi:10.1080/03019233.2019.1702828

Cited by 10 publications

(4 citation statements)

References 31 publications

(42 reference statements)

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“…In addition to that, the process involving the separation of slag and hot metal is also affected owing to the high Al 2 O 3 content in the slag [61]. The liquidus temperature is significantly increased owing to higher Al 2 O 3 content which increases the temperature requirement of the blast furnace.…”

Section: Industrial Impact Of High Alumina Burden In the Blast Furnacementioning

confidence: 99%

Optimization of high alumina slag practice in blast furnace ironmaking: an industrial approach (PART 1: fundamental aspects)

Hazra,

Pal,

Biswajeet

et al. 2023

Ironmaking & Steelmaking

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The productivity of the blast furnace Ironmaking process is significantly dependent on the slag chemistry. The presence of compounds like Al 2 O 3 in high quantities can make the hearth slag highly viscous and difficult to tap. The objective of part-1 of this study is to provide a comprehensive analysis of the role of high alumina (Al 2 O 3 > 15%) compositions in the blast furnace slags. Slag viscosity, liquidus temperature, activation energy, etc., are critically reviewed with respective solutions to operate under the desired conditions. Flow parameters of the slag are examined to understand the melting-softening phenomena which directly affect the slag tap-totap time. The addition of certain additives to the slag system has also been studied with the aim to improve the target properties of the slag. A range of slag compositions and their optimization techniques are discussed in this part to provide greater insight into the topic.

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Section: Industrial Impact Of High Alumina Burden In the Blast Furnacementioning

confidence: 99%

Optimization of high alumina slag practice in blast furnace ironmaking: an industrial approach (PART 1: fundamental aspects)

Hazra,

Pal,

Biswajeet

et al. 2023

Ironmaking & Steelmaking

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“…The high alumina content in the iron ore poses a major challenge in blast furnace operation. To maintain appropriate slag viscosity, plants practice the addition of quartz and correspondingly the addition of lime to take care of basicity [17]. This results in a significant increase in the slag rate for Indian blast furnaces (375-420 kg/ton of hot metal as compared to 350-375 kg/ton of hot metal in China).…”

Section: Processesmentioning

confidence: 99%

Challenges and Outlines of Steelmaking toward the Year 2030 and Beyond—Indian Perspective

Shanmugam

Nurni

Sambandam

et al. 2021

Metals

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In FY-20, India’s steel production was 109 MT, and it is the second-largest steel producer on the planet, after China. India’s per capita consumption of steel was around 75 kg, which has risen from 59 kg in FY-14. Despite the increase in consumption, it is much lower than the average global consumption of 230 kg. The per capita consumption of steel is one of the strongest indicators of economic development across the nation. Thus, India has an ambitious plan of increasing steel production to around 250 MT and per capita consumption to around 160 kg by the year 2030. Steel manufacturers in India can be classified based on production routes as (a) oxygen route (BF/BOF route) and (b) electric route (electric arc furnace and induction furnace). One of the major issues for manufacturers of both routes is the availability of raw materials such as iron ore, direct reduced iron (DRI), and scrap. To achieve the level of 250 MT, steel manufacturers have to focus on improving the current process and product scenario as well as on research and development activities. The challenge to stop global warming has forced the global steel industry to strongly cut its CO2 emissions. In the case of India, this target will be extremely difficult by ruling in the production duplication planned by the year 2030. This work focuses on the recent developments of various processes and challenges associated with them. Possibilities and opportunities for improving the current processes such as top gas recycling, increasing pulverized coal injection, and hydrogenation as well as the implementation of new processes such as HIsarna and other CO2-lean iron production technologies are discussed. In addition, the eventual transition to hydrogen ironmaking and “green” electricity in smelting are considered. By fast-acting improvements in current facilities and brave investments in new carbon-lean technologies, the CO2 emissions of the Indian steel industry can peak and turn downward toward carbon-neutral production.

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“…As a result, alumina input to the blast furnace (BF) has increased from 52 to 62 kg/thm. 2 Higher Al 2 O 3 content in the BF slag increases the viscosity and liquidus temperature, which, in turn, would cause difficulty during the taping of BF slag.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of slag composition (MgO and Basicity) to operate 20% alumina in Blast Furnace slag

Sahoo,

Hazra,

Kumar

et al. 2024

Mineral Processing and Extractive Metallurgy: Transactions of t

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Blast furnace (BF) operation depends on the smooth upward movement of gas and its pressure drop. The slag properties like viscosity affects the gas flow inside the furnace. It is well-known that Al2O3 contributes to the increase of slag viscosity. For smooth BF operation, the maximum limit of Al2O3 in the Indian BF slag is around 18.5%. Higher Al2O3 contents make tapping of the BF slag difficult. In the present work, FACTSAGE calculations were carried out to estimate the viscosity and melting temperature of 20% Al2O3 slag varying MgO% between 7 and 13 and basicity (B2, defined as wt% CaO/wt % SiO2) between 0.9 and 1.2 to find an optimum MgO% and basicity for easy tapping of the slag. The results of the calculations provide three combinations of MgO (12,12.5,13%) and B2 (0.95) of slag for operating 20% Al2O3 in slag which were validated through experimental studies involves the inclined plane test, hot stage microscopy and X-ray diffraction.

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Means to cope with the higher alumina burden in the blast furnace

Cited by 10 publications

References 31 publications

Optimization of high alumina slag practice in blast furnace ironmaking: an industrial approach (PART 1: fundamental aspects)

Optimization of high alumina slag practice in blast furnace ironmaking: an industrial approach (PART 1: fundamental aspects)

Challenges and Outlines of Steelmaking toward the Year 2030 and Beyond—Indian Perspective

Optimisation of slag composition (MgO and Basicity) to operate 20% alumina in Blast Furnace slag

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