Cold Briquetting of DRI Fines for Use in Steel Making Process

Barisetty, Sivalingaraju; Kalshetty, Sharanappa; Ramakrishna, S.; Vishwanath, S. C.; Balachandran, G.

doi:10.1007/s12666-019-01856-0

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…For these reasons, Fe resources contained in copper slag can be recycled efficiently by the direct reduction method. The obtained metallic iron produced, with more 90% iron content, is an excellent raw material for the iron and steel industry [32].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Iron from Copper Slag Using Coal-Based Direct Reduction: Reduction Characteristics and Kinetics

Zhang

Gao

et al. 2020

Minerals

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The Fe3O4 and Fe2SiO4 in copper slag were successfully reduced to metallic iron by coal-based direct reduction. Under the best reduction conditions of 1300 °C reduction temperature, 30 min reduction time, 35 wt.% coal dosage, and 20 wt.% CaO dosage (0.75 binary basicity), the Fe grade of obtained iron concentration achieved 91.55%, and the Fe recovery was 98.13%. The kinetic studies on reduction indicated that the reduction of copper slag was controlled by the interfacial reaction and carbon gasification at 1050 °C. When at a higher reduction temperature, the copper slag reduction was controlled by the diffusion of the gas. The integral kinetics model research illustrated that the reaction activation energy increased as the reduction of copper slag proceeded. The early reduction of Fe3O4 needed a low reaction activation energy. The subsequent reduction of Fe2SiO4 needed higher reaction activation energy compared with that of Fe3O4 reduction.

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Section: Introductionmentioning

confidence: 99%

Recovery of Iron from Copper Slag Using Coal-Based Direct Reduction: Reduction Characteristics and Kinetics

Zhang

Gao

et al. 2020

Minerals

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“…Estimates range between 5 -15% of undersize fines during RHF production 169 . Due to their low volatile metal content and high metallic Fe content these would be suitable for recycling through the sinter plant or cold-bonded into briquettes for use in the BF or the BOF 187 .…”

Section: Recycling Routes -Bf Bof or Sinter Plant?mentioning

confidence: 99%

Value Generation by Recovering By-Products from Steelmaking Processes: Dezincification of Basic Oxygen Steelmaking Slurry

Stewart¹

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The production of steel through the blast furnace/basic oxygen steelmaking route generates approximately 10kg of ferrous dusts and sludges per tonne of hot metal produced. This ferrous material is readily recyclable via a sinter plant to recover iron units but is difficult to recycle when the material is contaminated with zinc. Historically, excess material has been stockpiled or landfilled which presents an environmental issue but also a commercial opportunity to recover huge volumes of ferrous material from operating and former steelmaking sites. A review of best available technology for recovery of zinc from steelmaking by-product dusts identified that the Rotary Hearth Furnace (RHF) is the most attractive commercialized option for processing of material at an integrated plant such as Tata Steel Port Talbot, but due to the relatively low value of the ferrous direct reduced iron (DRI) product is still not commercially viable. A characterization study of basic oxygen steelmaking dust from Port Talbot, Redcar and Scunthorpe steel plants in the United Kingdom was undertaken using a variety of techniques and indicated pyrometallurgical recovery would be the preferred recovery route due to the high metallization and variability of the morphology of the dusts. Benchmarking of material from Port Talbot material processed in laboratory furnace trials under conditions mimicking the RHF showed that while volatile metal removal and iron reduction performance is adequate for recycling at realistic RHF temperatures and hold times, the high sulfur and gangue content mean the produced DRI would not be valuable enough to offset production costs. A computational thermochemical study was undertaken using FactSage and identified the possibility of applying next generation RHF technology to produce high value pig iron nuggets from steelmaking by-products. This possibility was confirmed experimentally, producing pig iron nuggets from BOS dust with complete removal of zinc from the material, at feasible process conditions, by addition of SiO2 and MgO fluxes. Alternative reductants for the RHF were also explored, specifically adapting the RHF process to utilize the enormous volume of plastic waste generated from facemasks in the wake of the COVID-19 pandemic. The addition of facemask plastic to a low-volatile coal was found to increase its CO2 gasification reactivity, which has associated process benefits for direct reduction.

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Optimized rotary hearth furnace utilization with blast furnace and electric arc furnace: Techno-economics, CO2 reduction

Kim¹,

Son

Park³

et al. 2022

Fuel Processing Technology

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Cold Briquetting of DRI Fines for Use in Steel Making Process

Cited by 4 publications

References 4 publications

Recovery of Iron from Copper Slag Using Coal-Based Direct Reduction: Reduction Characteristics and Kinetics

Recovery of Iron from Copper Slag Using Coal-Based Direct Reduction: Reduction Characteristics and Kinetics

Value Generation by Recovering By-Products from Steelmaking Processes: Dezincification of Basic Oxygen Steelmaking Slurry

Optimized rotary hearth furnace utilization with blast furnace and electric arc furnace: Techno-economics, CO2 reduction

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