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System analysis of slag utilisation from vanadium recovery in an integrated steel plant
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0003-1511-8020
2013 (Engelska)Ingår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 47, s. 43-51Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Vanadium in raw materials used in iron- and steelmaking, a particular challenge for Nordic steel producers, affects the composition of the generated slag from the steelmaking vessel, i.e. the basic oxygen furnace (BOF) adversely and reduces the potential for recycling and external utilisation. A process concept under development aims to enrich and extract the vanadium content of slag from the BOF, making use of the vanadium in the slag and also increasing the overall slag use potential. Applications of this concept affect slag compositions and internal material flows in the iron and steel production system, especially when recycling BOF slags as flux in the blast furnace (BF). This paper will present a case study, based on a Process Integration (PI) approach, using a designated system model to simulate the steel production system and the implementation of the process concept, thereby analysing how to obtain maximum usage of metallurgical slags without compromising the quality of the main product, i.e. liquid steel. Different approaches were studied to improve the environmental sustainability in the production system by maximising the material efficiency through vanadium recovery (as FeV alloy) and the use of slags, thereby minimising the stored/deposited slag amounts.

Ort, förlag, år, upplaga, sidor
2013. Vol. 47, s. 43-51
Nationell ämneskategori
Metallurgi och metalliska material
Forskningsämne
Processmetallurgi
Identifikatorer
URN: urn:nbn:se:ltu:diva-7825DOI: 10.1016/j.jclepro.2012.09.002ISI: 000319178200006Scopus ID: 2-s2.0-84879904081Lokalt ID: 63f505d0-234d-4821-8efb-4257a2f9f79fOAI: oai:DiVA.org:ltu-7825DiVA, id: diva2:980715
Anmärkning
Validerad; 2013; 20120914 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2019-10-18Bibliografiskt granskad
Ingår i avhandling
1. A Process Integration Approach to Assessing Possibilities for Improved Material Efficiency in Nordic ore-based Iron- and Steelmaking Systems
Öppna denna publikation i ny flik eller fönster >>A Process Integration Approach to Assessing Possibilities for Improved Material Efficiency in Nordic ore-based Iron- and Steelmaking Systems
2019 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[sv]
En processintegrationsstrategi för bedömning av möjligheter för förbättrad materialeffektivitet i nordiska malmbaserade järn- och ståltillverkningssystem
Abstract [en]

Iron- and steel production is a material- and energy intensive industrial activity. The production of one tonne of steel commonly results in some 400 kilograms of residual materials such as metallurgical slags, dusts, sludge and scales generated in the processes. Much work is continuously devoted to finding possible ways of using residual materials and minimising landfilled volumes. As these materials often contain considerable amounts of valuable elements such as iron, coal, manganese and calcium, it may be profitable to use them to replace virgin raw materials or to sell them as products that may be useful in other industries and/or processes. 

 

The thesis is based on case studies that exemplify how the use of process integration, through system analysis, can assist in assessing effects and opportunities for different concepts for increased material efficiency in Nordic ore-based steelmaking systems. The process integration approach taken for this research work was the simulation of a specific iron- and steel production system and the use of an optimisation tool for the evaluation of an extended system including the symbiosis between four steel plants.

 

Three different cases were studied including: system effects of increased magnesium oxide content in the lime raw material, investigation of the prospects for vanadium enrichment and slag reduction concept and a study of the logistics perspective for a joint residual material upgrading and recycling venture between four steel plants. The analysed cases present possibilities to improve the material efficiency by:

•      Enhanced recovery of residual materials;

•      Upgrading of residual materials to products;

•      Specific elements recovery;

•      Decreased use of virgin raw material;

•      Improved quality of residual materials;

•      Decreased amounts of materials placed in long-term storage or landfills.

 

From the results of the cases studied, the best scenarios and potential gains by enhanced material efficiency is presented. In the case of system effects of increased magnesium oxide content in the lime raw material, the issue was mainly to obtain maximum usage of metallurgical slags without compromising the quality of the main product. The calculated possibility of increased slag recirculation enabled further a decreased consumption of iron ore pellet and limestone. Regarding the investigation of the vanadium enrichment and slag reduction concept, the best scenario markedly increased the internal slag recirculation in order to enrich the vanadium content in the slag for ferrovanadium production. By the vanadium enrichment and recovery concept, considerable amounts of vanadium would be made useful instead of ending up in long-term storage. The study of a shared Nordic concept for residual materials upgrading and use demonstrated the potential for upgrading the materials to a direct reduced iron product for recovery in blast furnace. The concept showed high potential for significantly reducing the amount of material being long-term stored or deposited to landfill and thus a potential step towards achieving the zero-waste philosophy target.

 

None of the concepts for enhanced material efficiency studied in this thesis work has been implemented; however, they are still of relevance for the Nordic steel industry.

Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2019. s. 82
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Nyckelord
Process metallurgy, Process integration, System analysis
Nationell ämneskategori
Metallurgi och metalliska material
Forskningsämne
Processmetallurgi
Identifikatorer
urn:nbn:se:ltu:diva-76435 (URN)978-91-7790-478-6 (ISBN)978-91-7790-479-3 (ISBN)
Presentation
2019-12-11, F531, LTU, Luleå, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2019-10-18 Skapad: 2019-10-18 Senast uppdaterad: 2019-11-27Bibliografiskt granskad

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