Modification of Basic Oxygen Furnace Slag for Cement Manufacturing

Neto, João Batista Ferreira; Fredericci, Cátia; Faria, João O. G.; Chotoli, Fabiano Ferreira; Ribeiro, Tiago Ramos; Malynowskyj, Antonio; Silva, Andre L. N.; Quarcioni, V. A.; Lotto, Andre A.

doi:10.1007/s40831-017-0133-5

Cited by 8 publications

(1 citation statement)

References 20 publications

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“…Due to its hardness, BFS is commonly used for road construction and as concrete aggregate [5,6,7,8,9]; however, it must be stabilized first due to the presence of SiO 2 , CaO, Al 2 O 3 , and MgO. The reaction of free calcium oxide (f-CaO) with water can lead to the formation of Ca(OH) 2 and CaCO 3 [10,11], resulting in excessive expansion and alkali-aggregate reactions [12,13].…”

Section: Introductionmentioning

confidence: 99%

Feasibility and Characterization Mortar Blended with High-Amount Basic Oxygen Furnace Slag

Lin

Tsai²,

Chen

et al. 2018

Materials

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Basic oxygen furnace slag (BOFS) was ground to three levels of fineness as a replacement for cement at weight proportions of 10, 30, 50, and 70 wt.%. Fineness and weight proportion were shown to have significant effects on the flowability and setting time of the mortars. The expansion of BOFS mortars increased with an increase in the proportion of cement replaced, thereby exacerbating the effects of cracking. Optimal mechanical properties were achieved when 10 wt.% of the cement was replaced using BOFS with fineness of 10,000 cm2/g. The compressive strength of BOFS mortar is similar to that of ordinary Portland mortar, which makes BOFS suitable for the partial replacement of cement as a supplementary cementitious material. Scanning electron microscopy results revealed that the reaction of CaO with H2O results in the formation of C–S–H colloids, whereas the reaction of SiO2 with Al2O3 produces C–A–S–H colloids. The use of BOFS as a partial replacement for Portland cement could make a tremendous contribution to the steel industry and help to lower CO2 emissions.

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Section: Introductionmentioning

confidence: 99%

Feasibility and Characterization Mortar Blended with High-Amount Basic Oxygen Furnace Slag

Lin

Tsai²,

Chen

et al. 2018

Materials

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On the incorporation of strontium into the crystal structure of bredigite: structural effects and phase transition

et al. 2021

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Sr-substitution in the crystal structure of bredigite has been studied in detail. Samples of a hypothetical solid-solution series with nominal composition Ca7-xSrxMg[SiO4]4 (x = 0, 2, …,7) have been prepared from sinter reactions in the temperature range between 1275 and 1325 °C and characterized using powder and single-crystal X-ray diffraction. Synthesis runs between x = 1 and x = 4 resulted in compounds with increasing Sr contents, for which single-crystal diffraction studies revealed the following Sr/(Sr + Ca) atomic ratios: 0.133,0.268, 0.409 and 0.559. They are isostructural to the pure calcium end-member (x = 0) and adopt the orthorhombic space group Pnnm. Evolution of the unit-cell parameters and cell volumes of the solid-solution series are defined by linear or nearly linear trends when plotted against the Sr/(Sr + Ca) atomic ratio. Replacement of calcium with strontium atoms on the different sites shows clear preferences for specific positions. For the experiment with x = 5, formation of bredigite-related single-crystals with Sr/(Sr + Ca) = 0.675 was observed. These samples, however, exhibited a halved c lattice parameter when compared with the corresponding value in the Pnnm structure, pointing to a compositionally induced phase transition somewhere in region between Sr/(Sr + Ca) = 0.559 and 0.675. The crystal structure of this new phase with composition Ca2.32Sr4.82Mg0.86[SiO4]4 was successfully determined in space group Pbam. Basic crystallographic data are as follows: a = 18.869(2) Å, b = 6.9445(8) Å, c = 5.5426(6) Å, V = 726.28(14) Å3, Z = 2. Structure determination was accomplished using charge flipping. Subsequent least-squares refinements resulted in a residual of R(|F|) = 2.70% for 822 independent reflections and 87 parameters. The Pbam- and the Pnnm-structures are in a group-subgroup relationship and topologically related. Both are based on so-called pinwheel-like MSi6O24 clusters consisting of a central magnesium-dominated [MO6]-octahedron as well as six attached [SiO4]-tetrahedra. The clusters are linked into chain-like elements running along [001]. Linkage between the chains is provided by mixed Sr/Ca positions with 6 to 10 oxygen ligands. Differences between the two phases result from changes in Sr-Ca site occupancies in combination with displacements of the atoms and tilts of the tetrahedra. The distortion pattern has been studied using group-theoretical methods including mode analysis. Notably, for the samples with x = 6 and x = 7—the latter corresponding to the hypothetical pure strontium end-member composition—no bredigite-type phases could be identified, indicating that there is an upper limit for the Sr-uptake.

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Application of Steel Slag in Road Semi-Rigid Subgrade and its Volume Stability Modification Progress Study

Chen,

Wang

et al. 2024

JOM

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Modification of Basic Oxygen Furnace Slag for Cement Manufacturing

Cited by 8 publications

References 20 publications

Feasibility and Characterization Mortar Blended with High-Amount Basic Oxygen Furnace Slag

Feasibility and Characterization Mortar Blended with High-Amount Basic Oxygen Furnace Slag

On the incorporation of strontium into the crystal structure of bredigite: structural effects and phase transition

Application of Steel Slag in Road Semi-Rigid Subgrade and its Volume Stability Modification Progress Study

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