Study of the leaching behaviour of ladle slags by means of leaching tests combined with geochemical modelling and mineralogical investigations

Loncnar, Mojca; Sloot, H.A. van der; Mladenovič, Ana; Zupančič, Marija; Kobal, Lara; Bukovec, Peter

doi:10.1016/j.jhazmat.2016.05.046

Cited by 51 publications

(29 citation statements)

References 40 publications

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“…[11][12][13] However, environmental concerns about using of GGBS as soil stabilizer concentrated on the leachable quantities of hazardous elements, where chromium (Cr), barium (Ba), vanadium (V), molybdenum (Mo) have gained attention because of their toxicity on the environment and humans. 14,15 In many conditions, roads are at least partially environmentally open system. Therefore, GGBS is percolated by surface runoff water and rainwater.…”

Section: Introductionmentioning

confidence: 99%

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Effects of epoxy resin on ground-granulated blast furnace slag stabilized marine sediments

Guo

et al. 2017

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

“…Loncnar et al indicated that Ca(OH) 2 and calcium silicate hydrate (CSH) are the main solubility-controlling minerals. 14 Huijgen et al indicated that ettringite and portlandite can immobilize Ca 2+ from fresh BOF slags. 17 Baciocchi et al suggested that CSH is a solubility controlling phase of Si leaching.…”

Section: Introductionmentioning

confidence: 99%

Effects of epoxy resin on ground-granulated blast furnace slag stabilized marine sediments

Guo

et al. 2017

RSC Adv.

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“…Other studies have stated that secondary mechanisms such as the precipitation of calcium silicate hydrates (CSH) and Ca vanadates control the leaching behavior of V [18]. In contrast, Loncnar et al [32] postulated that the leaching was mainly controlled by surface reactions and not by the chemical composition of the investigated ladle slags. These contradictory results demonstrate that the exact controlling mechanisms for the mobility of Cr and V in slags are not completely understood yet.…”

Section: Introductionmentioning

confidence: 98%

Investigation of Possible Leaching Control Mechanisms for Chromium and Vanadium in Electric Arc Furnace (EAF) Slags Using Combined Experimental and Modeling Approaches

et al. 2019

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In this study, possible leaching control mechanisms for Cr and V in electric arc furnace slags were investigated by using a multi-methodological approach. Aside from chemical and mineralogical bulk analyses, special emphasis was given to surface investigations of the slags prior to and after leaching. In addition, pH dependence leaching tests were performed and the obtained data were evaluated with hydrogeochemical models. Investigations revealed that Cr and V are mainly bound in spinel and wuestite as well as minor amounts of olivine. Spinel and wuestite do not dissolve during water leaching for 48 h, whereas, depending on the composition of olivine, this phase either dissolves and releases V and Cr congruently, or does not dissolve but may hydrate. Melilite may also hydrate, but neither V nor Cr were detected in this phase. It appears that leached V is subsequently adsorbed onto these newly hydrated phases. The combination of the applied methods further showed that the abundance of calcium silicates, spinel, and wuestite is influenced by the FeO/SiO2 and CaO/SiO2 ratio in the slag. Therefore, it is assumed that the leaching of V and Cr can be minimized by changing these ratios to favor the formation of Fe bearing calcium silicate and spinel instead of wuestite.

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“…Various studies on the influence of the chemical and mineralogical composition on the release of heavy metals from steel slags as well as on surface reactions controlling the leaching behavior of slags are available (e.g., Aldrian [1][2][3][4][5][6][7][8]). However, conclusions drawn from these studies are not always applicable for all elements and all slag systems.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the FeO/SiO2 Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium

et al. 2020

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Based on recently published research on leaching control mechanisms in electric arc furnace (EAF) slags, it is assumed that a FeO/SiO 2 ratio of around one leads to low leached V and Cr concentrations. This ratio influences the mineral phase composition of the slag toward higher amounts of spinel and a lower solubility of calcium silicate phases by suppressing the formation of magnesiowuestite and highly soluble calcium silicate phases. To evaluate this hypothesis, laboratory and scaled up tests in an EAF pilot plant were performed on slag samples characterized by elevated V and Cr leaching and a high FeO/SiO 2 ratio. Prior to the melting experiments, the optimum FeO/SiO 2 ratio was calculated via FactSage TM . In the melting experiments, the ratio was adjusted by adding quartz sand, which also decreased the basicity (CaO/SiO 2 ) of the slag. As a reference, remelting experiments without quartz sand addition were conducted and additionally, the influence of the cooling rate of the slag was examined. The remelted (without quartz sand) and the remelted modified slags (with quartz sand) were analyzed chemically and mineralogically and the leaching behavior was investigated. The modification of the slags yielded a minimized release of V and Cr, supporting the hypothesis that the FeO/SiO 2 ratio influences the mineralogy and the leaching behavior.

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Study of the leaching behaviour of ladle slags by means of leaching tests combined with geochemical modelling and mineralogical investigations

Cited by 51 publications

References 40 publications

Effects of epoxy resin on ground-granulated blast furnace slag stabilized marine sediments

Effects of epoxy resin on ground-granulated blast furnace slag stabilized marine sediments

Investigation of Possible Leaching Control Mechanisms for Chromium and Vanadium in Electric Arc Furnace (EAF) Slags Using Combined Experimental and Modeling Approaches

Tailoring the FeO/SiO2 Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium

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