University of Oulu

Hietava, Anne; Iljana, Mikko; Heikkinen, Eetu-Pekka; Koskela, Aki; Fabritius, Timo (2021) Effect of coal and coke ash on blast furnace slag formation : comparison between PCI, charcoal, fossil-based coke and bio-coke. In: Proceedings of the 11th International Conference on Molten Slags, Fluxes and Salts, (pp. 1-2). The Korean Institute of Metals and Materials.

Effect of coal and coke ash on blast furnace slag formation : comparison between PCI, charcoal, fossil-based coke and bio-coke

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Author: Hietava, Anne1; Iljana, Mikko1; Heikkinen, Eetu-Pekka1;
Organizations: 1University of Oulu, Process Metallurgy, PO Box 4300, FI-90014 University of Oulu, Finland
Format: abstract
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.4 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2022012710492
Language: English
Published: The Korean Institute of Metals and Materials, 2021
Publish Date: 2022-01-27
Description:

Abstract

Blast furnace is the most used process for production of pig iron in the world. It is charged mainly with metallurgical coke and ferrous materials such as pellets and/or sinter. When descending inside the blast furnace, iron bearing materials start to reduce and with other burden material start to melt, which leads into formation of so-called primary slags from which the final slag is formed as materials descend inside the furnace. Every primary slag originates from one charge material and has unique effect on the total composition of the blast furnace slag. This work focuses on the primary slags of coke and pulverized coal injection (PCI). The global trend is to decrease the use of fossil-based carbon by replacing it with bio-based carbon. The primary slags of the coke and PCI originate from coke ash and pulverized coal ash. The purpose of this work is to evaluate how blast furnace slag composition is changed when fossil-based coke is replaced with bio-coke and PCI is replaced with charcoal. The effect differs case-by-case as presented in this work, but it was found out that replacing fossil-based coke with bio-coke and PCI with charcoal the solidus and liquidus temperatures as well as CaO/SiO₂ - and MgO/Al₂O₃ -ratios are increased. This comparison is based on mass balance calculations.

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Pages: 1 - 2
Host publication: Proceedings of the 11th International Conference on Molten Slags, Fluxes and Salts
Conference: International Conference of Molten Slags, Fluxes, and Salt
Field of Science: 222 Other engineering and technologies
Subjects:
Funding: Business Finland project SYMMET (Symbiosis of metal production and nature) is acknowledged for funding this work.
Copyright information: © The Authors.