The treatment of Basic Oxygen Furnace (BOF) slag with concentrated solar energy

González, Daniel Fernández; Prażuch, J.; Ruiz-Bustinza, I.; González-Gasca, C.; Piñuela-Noval, J.; González, Luis Felipe Verdeja

doi:10.1016/j.solener.2019.01.055

Cited by 37 publications

(9 citation statements)

References 23 publications

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“…As the oxygen available in the experiments is very limited due to the utilization of the glass chamber and the pump to remove the gases, the complete decomposition of the fayalite and the oxidation of the magnetite to obtain hematite are not possible. This is the reason for having such a quantity of magnetite at the end of the process (a similar situation was observed when treating BOF slags from the steel industry [53]), which otherwise is advantageous since it might be easily separated using magnetic methods.…”

Section: Discussionmentioning

confidence: 70%

“…In the case presented in this paper, either the Cu2S or the Cu2O, in slightly reductant environments propitiated by the presence of Fe3O4 (magnetite) and FeO (wustite), cause the thermodynamically stable species for the copper to be the metallic copper and not the oxide or the sulfide [56].…”

Section: Discussionmentioning

confidence: 85%

“…Both the temperature and time were enough to perform the experiments according to the thermodynamic calculations (theoretical) and, thus, achieve the decomposition of the fayalite into magnetite and silica, and the formation of metallic copper nodules from copper oxide (and from the occluded matte) [56]. From the thermodynamics point of view, the decomposition of the fayalite is possible in an oxidizing environment, while obtaining metallic copper is favorable under reductant conditions [56]. Both processes compete between them and it is not possible to complete them in a single step.…”

Section: Methodsmentioning

confidence: 99%

“…The application of CSP in materials science and metallurgy has been widely investigated by our research group. The following fields can be mentioned: synthesis of calcium aluminates [50], iron metallurgy [46,51,52], the treatment of Basic Oxygen Furnace (BOF) slag [53], the production of silicomanganese [54], and transformations in the Ca-Si-O system [55].…”

Section: Introductionmentioning

confidence: 99%

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Recovery of Copper and Magnetite from Copper Slag Using Concentrated Solar Power (CSP)

González

Prażuch

Ruiz-Bustinza

et al. 2021

Metals

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On the one hand, copper slag is nowadays a waste in copper pyrometallurgy despite the significant quantities of iron (>40 wt. %) and copper (1 to 2 wt. %). On the other hand, solar energy, when properly concentrated, offers great potential in high-temperature processes. Therefore, concentrated solar power (CSP) could be used in the treatment of copper slag to transform fayalite into magnetite and copper sulfides and oxides into copper nodules. This is the objective of this paper. The results show that fayalite was partially decomposed into magnetite and silica. Moreover, copper nodules (65–85 wt. % Cu) were identified in the treated samples, while the initial slag, analyzed by X-ray diffraction, X-ray fluorescence, and SEM-EDX, did not show the presence of metallic copper. Finally, the treated copper slag was crushed and grinded down to 40 μm, and two fractions were obtained by magnetic separation. The magnetic fraction (85%) was mainly comprised of magnetite, while the non-magnetic fraction (15%) had 5–10 wt. % Cu. Considering the experimental results, 7.5–18 kg Cu/t slag might be recovered from the slag. A preliminary economic analysis, considering the current copper price, indicates that only the recovery of copper could represent a significant economic benefit (>30 €/t slag). Therefore, CSP might be a potential candidate for the treatment of copper slag to recover copper and iron.

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Section: Discussionmentioning

confidence: 70%

Section: Discussionmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recovery of Copper and Magnetite from Copper Slag Using Concentrated Solar Power (CSP)

González

Prażuch

Ruiz-Bustinza

et al. 2021

Metals

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“…This fine-grained concentrate is referred to as demetallized steelmaking slag. The presence of CaO, MgO and MnO can be a positive factor in the steelmaking process, as they can replace part of limestone, dolomite and manganese ore and, consequently, reduce iron and steelmaking production costs (Fernandéz-Gonzáles et al, 2019). The main emphasis must therefore be placed on economic and technological aspects of the use of secondary products (Brožová et al, 2014).…”

Section: Introduction Oxygen Converter Slagmentioning

confidence: 99%

Recycling of the Steelmaking by-products into the Oxygen Converter Charge

Baricová

Pribulová

Buľko

et al. 2019

New Trends in Production Engineering

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In the technological process of the steelmaking plant, secondary products are produced in parallel with the production of the main product, which have the character of secondary by products or industrial waste. The major secondary products of steelmaking production include waste gases, process fluids, flue dust, sludge, slags and mill scales. The paper presents the results of research project directed to the utilization of demetallized steelmaking slag and oxygen converter flue dust in charge of top blowed oxygen converter. The influence of demetallized slag additions on slag regime in converter and chemical composition of final slag is described and discussed. Recommendations concerning amount of demetallized slag additions are also presented. Flue dust was recycled in form of briquettes. No significant effect of the recycling demetallized converter slag and flue dust briquette on process of hot metal refining and on quality of produced steel were recorded. Regarding the achieved results it can be confirmed that the use of the secondary products like demetallized slag and convertor flue dust in form briquettes, is environmentally acceptable as well as the use of natural materials and poses no increased risk to human health or the environment.

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Production of Iron by Reduction with Gas

González

2020

Operations and Basic Processes in Ironmaking

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The treatment of Basic Oxygen Furnace (BOF) slag with concentrated solar energy

Cited by 37 publications

References 23 publications

Recovery of Copper and Magnetite from Copper Slag Using Concentrated Solar Power (CSP)

Recovery of Copper and Magnetite from Copper Slag Using Concentrated Solar Power (CSP)

Recycling of the Steelmaking by-products into the Oxygen Converter Charge

Production of Iron by Reduction with Gas

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