Assessment of the Metallic Iron Content from Steelmaking Slags in Order to Conserve Natural Resources

Varvara, Dana Adriana Iluţiu –; Mârza, Carmen Maria; Brânduşan, Liviu; Aciu, Claudiu; Balog, Anca; Cobîrzan, Nicoleta

doi:10.1016/j.protcy.2013.12.538

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…Slag properties depend on the type of their origin process, the quality of the input materials, and the type of steel being produced [12]. Slags can be classified according to the following groups [13,14]: blast furnace slag, steel slag (including basic oxygen furnace slag-LD slag, electric arc furnace slag-EAF slag, steel secondary refining ladle furnace slag-vacuum arc degassing (VAD), vacuum oxygen decarburization (VOD), ladle furnace (LF), steel continuous casting tundish slag).…”

Section: Qualitative Characteristics Of Metallurgical Wastesmentioning

confidence: 99%

Research on Reduction of Selected Iron-Bearing Waste Materials

et al. 2021

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During the steel production process, nearly twice as many input materials are used as compared to finished products. This creates a large amount of post-production waste, including slag, dust, and sludge. New iron production technologies enable the reuse and recycling of metallurgical waste. This paper presents an investigation on the reduction of selected iron-bearing waste materials in a laboratory rotary furnace. Iron-bearing waste materials in the form of dust, scale, and sludge were obtained from several Polish metallurgical plants as research material. A chemical analysis made it possible to select samples with sufficiently high iron content for testing. The assumed iron content limit in waste materials was 40 wt.% Fe. A sieve analysis of the samples used in the subsequent stages of the research was also performed. The tests carried out with the use of a CO as a reducer, at a temperature of 1000 °C, allowed to obtain high levels of metallization of the samples for scale 91.6%, dust 66.9%, and sludge 97.3%. These results indicate that in the case of sludge and scale, the degree of metallization meets the requirements for charge materials used in both blast furnace (BF) and electric arc furnace (EAF) steelmaking processes, while in the case of reduced dust, this material can be used as enriched charge in the blast furnace process. Reduction studies were also carried out using a gas mixture of CO and H2 (50 vol.% CO + 50 vol.% H2). The introduction of hydrogen as a reducing agent in reduction processes meets the urgent need of reducing CO2 emissions. The obtained results confirm the great importance and influence of the selection of the right amount of reducer on the achievement of a high degree of metallization and that these materials can be a valuable source of metallic charge for blast furnace and steelmaking processes. At an earlier stage of the established research program, experiments of the iron oxides reduction from iron-bearing waste materials in a stationary layer in a Tammann furnace were also conducted.

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Section: Qualitative Characteristics Of Metallurgical Wastesmentioning

confidence: 99%

Research on Reduction of Selected Iron-Bearing Waste Materials

et al. 2021

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“…The separation of the metallic iron from slag, followed by its use in various fields, would lead to greater savings and the conservation of natural resources. The metallic iron from slag may be used as raw material in steelmaking or in other technological processes (Iluţiu-Varvara et al 2014).…”

Section: Mineral and Chemical Characteristics Of Metallic Precipitate...mentioning

confidence: 99%