Hot stage processing of metallurgical slags

Durinck, Dirk; Engström, Fredrik; Arnout, Sander; Heulens, Jeroen; Jones, Peter Tom; Björkman, Bo; Blanpain, Bart; Wollants, Patrick

doi:10.1016/j.resconrec.2008.07.001

Cited by 108 publications

(64 citation statements)

References 72 publications

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“…The CaO-CaF 2 slag is so basic that C 2 S can be formed during the post-metallurgical slag cooling process which leads to disintegration due to the β-C 2 S to γ-C 2 S transformation. 1) Therefore, this slag is not easily valorised at this moment. In addition, the slag may show environmental risks related to fluorine leaching.…”

Section: Introductionmentioning

confidence: 99%

Desulphurisation of Stainless Steel by Using CaO^|^ndash;Al2O3 Based Slags during Secondary Metallurgy

et al. 2013

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The effect of the slag and steel chemistry on the desulphurisation behaviour of stainless steel by using lime-alumina based slag has been studied on a laboratory scale. The sulphide capacity of the slag and sulphur distribution ratio between slag and steel were calculated with the aid of FactSage software. A kinetic model was developed to predict the evolution of sulphur content in molten steel during the treatment, and a good agreement between experimental data and modelling results was obtained. The sulphur removal rate in molten steel was found to be accelerated with increasing temperature and initial sulphur content in the steel. The desulphurisation capability of the optimized lime-alumina based slag was found to be similar as that of lime-fluorspar based slag.

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Section: Introductionmentioning

confidence: 99%

Desulphurisation of Stainless Steel by Using CaO^|^ndash;Al2O3 Based Slags during Secondary Metallurgy

et al. 2013

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“…The research intended to study the composition and properties of ferrous slags (including steelmaking slags) and improve the technologies for their recycling and disposal is still relevant (Geiseler, 1996;Rao, 2004;Huiting et al, 2004;Durinck et al, 2008;Gudim et al, 2009;Huaiwei and Xin, 2011;Yildirim and Prezzi, 2011). Last but not least, the attention to slags is related to the environmental problems associated with their storage and disposal (Piatak et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

On Expediency of the Preliminary Heat Treatment for Liquid-Phase Reduction of Waste Steelmaking Slag

Trofimov¹,

Chumanov²,

Dildin³

et al. 2015

American Journal of Applied Sciences

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The problem of using waste steelmaking slags as a technogenic source of metallurgical raw materials still has no sustainable solution and requires innovative ideas and approaches. The purpose of this paper is a theoretical and experimental study of the possibility and expediency of the preliminary heat treatment of steelmaking slags in a reducing medium for greater metal recovery. The subject of research is a slag sample taken from the slag heaps at Zlatoust Metallurgic Plant (the Russian Federation). To perform thermodynamic simulation of the processes running during heat treatment of a slag substance, the FactSage software package (version 6.4) was applied. For the ease of analysis the key calculation results are presented as a logarithmic dependence of component weights and composition of the considered phases on temperature. The experimental studies include heat treatment tests on slag samples at temperatures of 1100 and 1200°C in air and in the carbon monoxide medium with further separation of the derived product. The composition of test samples is determined by electron microprobe analysis and X-ray diffraction analysis. It has been reported that heat treatment in carbon monoxide medium makes possible to significantly increase the iron content in the derived magnetic fraction. The results of thermodynamic simulation, composition analysis of samples and weight data for the obtained magnetic fractions (resistant or non-resistant to the magnetic field) suggest that the preliminary heat treatment of slag in carbon monoxide medium is expedient.

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“…A combination of the two methods is also possible. Another possibility could be the addition of MgO [6] in order to form a magnesiochromite spinel phase (MgCr 2 O 4 ), or the addition of spinel compounds, as reported elsewhere [7]. These methods could effectively transform the slag and make it compliant with stringent environmental regulations.…”

Section: Introductionmentioning

confidence: 99%

Stabilisation and Microstructural Modification of Stainless Steel Converter Slag by Addition of an Alumina Rich By-Product

Iacobescu

Malfliet

Machiels

et al. 2014

Waste Biomass Valor

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This work aimed to assess the possibility of stabilising argon oxygen decarburisation (AOD) stainless steel slag with CaO/SiO 2 * 1.6, by using a secondary alumina by-product (*75 wt% Al 2 O 3 , referred herein as SA, found under the name ''ValoxyÒ'') and reduced levels of B 2 O 3 . Two groups of samples were synthesised: one reference group with AOD slag and 0.26, 0.16, 0.10 and 0.05 wt% of B 2 O 3 and one with equivalent compositions but to which 5 wt% of SA is added. Experimentally, the slags were produced in a platinum crucible in a resistance furnace, heated with 5°C/min until 1,640°C, equilibrated for 1 h, followed by slow cooling to room temperature. The mineralogical composition was analysed by QXRD whereas the micro-hardness was measured through a Vickers indentation test. The microchemistry and morphology were analysed by EPMA-WDS. Analysis indicated that AOD was successfully stabilised by 5 wt% SA and 0.10 wt% B 2 O 3 , whereas for 0.05 wt% B 2 O 3 , volumetric expansion occurred over time. In terms of mineralogy, the use of SA promoted the formation of spinel instead of gehlenite. Electron microscopy revealed a more dense morphology in the samples with SA when compared to the reference ones. Elemental maps indicated that Cr predominantly participates in the spinel phase. Vickers tests showed a slight increase in hardness in the samples with SA. In conclusion, the addition of SA resulted in substantially different microstructures that appear to be promising in terms of chemical and mechanical stability. However, in terms of volumes the required addition levels for effective stabilisation are substantial compared to B 2 O 3 additions.

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Hot stage processing of metallurgical slags

Cited by 108 publications

References 72 publications

Desulphurisation of Stainless Steel by Using CaO^|^ndash;Al2O3 Based Slags during Secondary Metallurgy

Desulphurisation of Stainless Steel by Using CaO^|^ndash;Al2O3 Based Slags during Secondary Metallurgy

On Expediency of the Preliminary Heat Treatment for Liquid-Phase Reduction of Waste Steelmaking Slag

Stabilisation and Microstructural Modification of Stainless Steel Converter Slag by Addition of an Alumina Rich By-Product

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