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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 1
SUMMARY:Case study: Four different feeds to a DRI smelting furnace
DESCRIPTION:Case study: Three different feeds to a DRI smelting furnace

Timo Haimi, Metso Outotec Metals Oy

Abstract

The decarbonization of Iron and Steel Industry has been progressing rapidly in the recent years with many projects advancing into next stages. The standard solution for lower CO2 emissions in steel making has been using the shaft kiln based direct reduction plant and a scrap melting electric arc furnace instead of blast furnace. However, if the majority of the primary steel making plants would follow the same approach, there would be a shortage of DRI-quality iron ore and high quality steel scrap. Hence there is a need to utilize new technological solutions to enable use of standard, blast furnace grade iron ore, especially to deal with the excess gangue and higher amount of slag.

Metso Outotec has been checking whether the existing non-ferrous and ferroalloys smelting furnaces could be used in smelting of direct reduced iron feed, with the target of removing the slag from the DRI feed without causing extra iron losses into the slag. As there are many different types and qualities of DRI available for the smelting feed, there is also a need to evaluate the differences of each feed and all different DRI types would naturally generate different type of metal product as well.

The following paper describes three case studies about different DRI feeds into the Metso Outotec DRI smelting furnace. The first case is high quality DRI with 0% carbon content, the second case is BF-grade DRI with 0% carbon content and the third case is BF-grade DRI with 4% carbon content. The carbon contents of these product metals made out of these feeds have been assumed to be 1%, 2% and 4% respectively. The case studies are showing different process parameters for each cases

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