A Differential Scanning Calorimetry Method for Construction of Continuous Cooling Transformation Diagram of Blast Furnace Slag

Gan, Lei; Zhang, Chunxia; Shangguan, Fangqin; Li, Xiuping

doi:10.1007/s11663-011-9631-1

Cited by 36 publications

(15 citation statements)

References 30 publications

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“…Therefore, by adopting cooling rates higher than 4°C/s, more than 95 wt% glassy phase was predicted in BF slag. The cooling rates for the glassy/ crystalline transition observed in this paper are much lower than those determined by Kashiwaya et al [15] but relatively close to the rates determined by Gan et al [16] in BF slags of 0.5 to 1°C/s. Discrepancies are attributable to differences in the chemical compositions of slag samples, which can affect the beginning of crystallization.…”

Section: Bf Slagsupporting

confidence: 82%

“…For example, the alumina content of BF slag adopted by Gan et al (17.6 wt%) is much higher than the alumina content of BF slag used in the present work (10.5 wt%); alumina contributes to the stabilization of the glassy phase in slags [7]. These differences may also be related to the DSC technique adopted by Gan et al [16] to evaluate slag crystallization, which may not be sufficiently sensitive to detect, via thermal effects, the formation of small crystals during slag cooling. Figure 5 presents the thermodynamic simulation of BF slag solidification performed using FactSage TM software.…”

Section: Bf Slagmentioning

confidence: 56%

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Modification of Molten Steelmaking Slag for Cement Application

Neto

Faria

Fredericci

et al. 2015

J. Sustain. Metall.

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The use of metallurgical slags in cement production depends on the phases present in such slags, which are affected by changes in slag composition as well as the cooling rates adopted during solidification. In this work, slags with distinct chemical compositions were melted and subjected to different cooling conditions. Slag samples were characterized by X-ray diffraction to identify and quantify mineralogical phases and by X-ray fluorescence to determine chemical composition. The microstructure of the samples was characterized by scanning electron microscopy coupled to energy dispersive spectroscopy for phase identification. The solidification of the slags was simulated using FactSage TM for solidification path evaluation, enabling a comparison of the phases determined by thermodynamic equilibrium with those analysed in slag samples. Slags with low basicity (CaO/SiO 2 \1.25) and Al 2 O 3 content of 11 wt% exhibited a high glassy phase content depending on the cooling conditions. The phases formed in slags with higher basicity (1.4 and 3.8) were less affected by cooling rate and were different silicates, such as larnite, merwinite, monticellite, akermanite, gehlenite and melilite, whereas slags with basicity C1.37 exhibited RO phase (solid solution of FeO, MgO, CaO and MnO).

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Section: Bf Slagsupporting

confidence: 82%

Section: Bf Slagmentioning

confidence: 56%

Modification of Molten Steelmaking Slag for Cement Application

Neto

Faria

Fredericci

et al. 2015

J. Sustain. Metall.

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show abstract

“…Based on their results, they created a Temperature Time Transformation (TTT) diagram for the coal-petcoke mixture, which provides a more fundamental understanding of transformation process. Another useful diagram to provide information of crystallization affected by cooling rates is the Continuous Cooling Transformation (CCT) diagram [14,15] constructed for blast furnace slag. The information in TTT and CCT diagrams reveals the influence of temperature and cooling rates on crystallization for a specific slag.…”

Section: Introductionmentioning

confidence: 99%

Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag

Wang

Whitty

Guan

et al. 2014

Fuel

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“…Combined with Equations (11) and (12), the nucleation rate I of a crystal could be expressed as Equation (13).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The crystallization behavior of melts can be studied by three kinds of methods: Experimental techniques, molecular dynamic simulation, and classical crystallization theory. For example, the crystallization behaviors of mold flux and Ti-bearing blast furnace slag were intensively investigated by the differential scanning calorimeter [13,14], the single hot thermocouple technique/double hot thermocouple technique [15][16][17], the confocal laser scanning microscope [18][19][20], and the viscosity-temperature curve method. Watson et al [21] studied the crystal nucleation and growth in Pd-Ni alloys by the molecular dynamic simulation, which was only suitable for a relatively simple system.…”

Section: Introductionmentioning

confidence: 99%

Crystallization Behaviors of Anosovite and Silicate Crystals in High CaO and MgO Titanium Slag

Hong

Chen

Liu

et al. 2018

Metals

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Electric-furnace smelting has become the dominant process for the production of the titanium slag from ilmenite in China. The crystallization behaviors of anosovite and silicate crystals in the high CaO and MgO titanium slag were studied to insure smooth operation of the smelting process and the efficient separation of titanium slag and metallic iron. The crystallization behaviors were studied by a mathematical model established in this work. Results show that the crystallization order of anosovite and silicate crystals in high CaO and MgO titanium slag during cooling is: Al2TiO5 > Ti3O5 > MgTi2O5 > MgSiO3 > CaSiO3 > FeTi2O5 > Mn2SiO4 > Fe2SiO4. Al2TiO5 and Ti3O5 have higher crystallization priority and should be responsible for the sharp increase in viscosity of titanium slag during cooling. The total crystallization rates of anosovite and silicate crystals are mainly controlled by Al2TiO5 and MgSiO3, respectively. The mass ratio of Ti2O3/ΣTiO2 has a prominent influence on the total crystallization rate of anosovite crystals while the mass ratio of MgO/FeO has a slight influence on the total crystallization rate of anosovite crystals.

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A Differential Scanning Calorimetry Method for Construction of Continuous Cooling Transformation Diagram of Blast Furnace Slag

Cited by 36 publications

References 30 publications

Modification of Molten Steelmaking Slag for Cement Application

Modification of Molten Steelmaking Slag for Cement Application

Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag

Crystallization Behaviors of Anosovite and Silicate Crystals in High CaO and MgO Titanium Slag

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