Use of BOF slag and blast furnace dust in asphalt concrete: an alternative for the construction of pavements

López-Díaz, Alfonso; Díaz, Ricardo Ochoa; León, Gloria Elizabeth Grimaldo

doi:10.15446/dyna.v85n206.70404

Cited by 11 publications

(4 citation statements)

References 8 publications

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“…Furthermore, the Chinese standard for first-class road/highway has been satisfied [72]. A recent work concerns the use of BOF slag as coarse aggregate as well as the Blast Furnace Dust (BFD) as a fine aggregate for manufacturing asphalt hot mixes for pavements [73]. The physical characteristics and the susceptibility to water and plastic deformation of each type of mixture have been assessed.…”

Section: By-products Reuse In Road Constructionmentioning

confidence: 99%

Reuse and Recycling of By-Products in the Steel Sector: Recent Achievements Paving the Way to Circular Economy and Industrial Symbiosis in Europe

Branca

Colla

Algermissen

et al. 2020

Metals

164

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Over the last few decades, the European steel industry has focused its efforts on the improvement of by-product recovery and quality, based not only on existing technologies, but also on the development of innovative sustainable solutions. These activities have led the steel industry to save natural resources and to reduce its environmental impact, resulting in being closer to its “zero-waste” goal. In addition, the concept of Circular Economy has been recently strongly emphasised at a European level. The opportunity is perceived of improving the environmental sustainability of the steel production by saving primary raw materials and costs related to by-products and waste landfilling. The aim of this review paper was to analyse the most recent results on the reuse and recycling of by-products of the steelmaking cycles as well as on the exploitation of by-products from other activities outside the steel production cycle, such as alternative carbon sources (e.g., biomasses and plastics). The most relevant results are identified and a global vision of the state-of-the-art is extracted, in order to provide a comprehensive overview of the main outcomes achieved by the European steel industry and of the ongoing or potential synergies with other industrial sectors.

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Section: By-products Reuse In Road Constructionmentioning

confidence: 99%

Reuse and Recycling of By-Products in the Steel Sector: Recent Achievements Paving the Way to Circular Economy and Industrial Symbiosis in Europe

Branca

Colla

Algermissen

et al. 2020

Metals

164

View full text Add to dashboard Cite

show abstract

“…BFD is a material that has been used very little as a material in road construction. In Colombia, some research has been carried out to analyse the feasibility of using this material in the manufacture of asphalt mixtures [19]. Materials such as slags, also residues from the iron and steel process, have been used to stabilize soils and granular materials [20].…”

Section: Methodsmentioning

confidence: 99%

Uso de polvo de alto horno para mejorar las propiedades de material granular para pavimentos

Díaz

2021

Rev. UIS ing.

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The granular base and sub-base materials used in the construction of road surface structures must comply with certain requirements. In some cases, the requirements are not complied with and it is necessary to search for alternatives to improve the properties of the materials and thereby enable the use of these materials in the construction of roadways. Blast furnace dust is a residue from the production of steel that is of little use and is causing a negative environmental impact due to its accumulation. This study was carried out to analyse the possibility of utilizing blast furnace dust to improve the properties of granular materials, as an alternative that mitigates the environmental problems caused by the disposal and accumulation of these residues, which affect the areas of influence of these companies. To achieve this goal, the chemical and physical properties of blast furnace dust were determined and a analysis was carried out on mixtures of granular base and sub-base materials with 0, 2, 4, 6, and 8 percent dust. The analysis took place of determined characteristics including optimum humidity, maximum dry density, resistance, plasticity, and expansion in the presence of water. The results indicate that with the incorporation of 6% of BFD the properties of the granular material are improved and it can be used as an optimal material in road construction.

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“…Post-production waste materials containing iron oxides and other valuable elements are recycled by being added directly to the metal bath, either by granulating or briquetting, as well as being entered as additional ferrous material in the furnace charge. Metallurgical waste materials can be an alternative to conventional raw materials for construction, cement, and road construction industries [ 5 , 6 , 7 ]. For economic reasons, metallurgical plants strive to recycle these materials [ 8 ].…”

Section: Introductionmentioning

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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Use of BOF slag and blast furnace dust in asphalt concrete: an alternative for the construction of pavements

Cited by 11 publications

References 8 publications

Reuse and Recycling of By-Products in the Steel Sector: Recent Achievements Paving the Way to Circular Economy and Industrial Symbiosis in Europe

Reuse and Recycling of By-Products in the Steel Sector: Recent Achievements Paving the Way to Circular Economy and Industrial Symbiosis in Europe

Uso de polvo de alto horno para mejorar las propiedades de material granular para pavimentos

Research on Reduction of Selected Iron-Bearing Waste Materials

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