CHAPTER 3. Geochemistry and Mineralogy of Slags

Piatak, Nadine M.; Ettler, Vojtěch; Hoppe, Darryl Andre

doi:10.1039/9781839164576-00059

Cited by 7 publications

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“…Chromium spinel in nature is recognized as a high-temperature mineral in magmatic systems; srebrodolskite is known from very few localities in particular geological settings, e.g. in the pyrometamorphic mineral assemblage 45 , or found as an artificial compound in metallurgical slags 46 . Eventually, srebrodolskite in KEU-1 might have been formed by solid-state CaO–FeO high temperature interactions under low oxygen partial pressure since some iron exists in its trivalent state 47 , incorporating Cr 2 O 3 partially substituting for Fe 2 O 3 .…”

Section: Discussionmentioning

confidence: 99%

Hexavalent chromium release over time from a pyrolyzed Cr-bearing tannery sludge

Ghezzi,

Mugnaioli,

Perchiazzi

et al. 2023

Sci Rep

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Pyrolysis in an inert atmosphere is a widely applied route to convert tannery wastes into reusable materials. In the present study, the Cr(III) conversion into the toxic hexavalent form in the pyrolyzed tannery waste referred to as KEU was investigated. Ageing experiments and leaching tests demonstrated that the Cr(III)–Cr(VI) inter-conversion occurs in the presence of air at ambient temperature, enhanced by wet environmental conditions. Microstructural analysis revealed that the Cr-primary mineral assemblage formed during pyrolysis (Cr-bearing srebrodolskite and Cr-magnetite spinel) destabilized upon spray water cooling in the last stage of the process. In the evolution from the higher to the lower temperature mineralogy, Cr is incorporated into newly formed CrOOH flakes which likely react in air forming extractable Cr(VI) species. This property transforms KEU from an inert waste to a hazardous material when exposed to ordinary ambient conditions.

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Section: Discussionmentioning

confidence: 99%

Hexavalent chromium release over time from a pyrolyzed Cr-bearing tannery sludge

Ghezzi,

Mugnaioli,

Perchiazzi

et al. 2023

Sci Rep

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“…The main chemical components of metallurgical slags formed directly during Zn and Pb processing include FeO total , SiO 2 , Al 2 O 3 , CaO, MgO, ZnO, and PbO [3,[19][20][21][22][23][24] (Table 1). These slags are characterised by significant variability in the content of their main constituents, with ranges including FeO total 0.88-59.6 wt%, SiO 2 2.04-57.1 wt%, CaO 0.18-32.23 wt%, MgO 0.61-15.9 wt%, ZnO 0.03-47.3 wt%, and PbO 0.002-6.4 wt% (Table 1).…”

Section: Slags Formed In Zn-pb Metallurgy Chemical and Mineral Compos...mentioning

confidence: 99%

“…Quantifying glass is highly challenging due to its amorphous nature and varying SiO 2 content, resulting in an ambiguous interpretation of the reflections related to the corresponding d hkl values in X-ray structural studies [27,44]. The glass also contains elements such as Fe, Al, Ca, Pb, Zn, Cu, and As, which occur in the form of nanometric oxide inclusions and intermetallic compounds [3,19,27,44]. In Zn-Pb metallurgical slags, in addition to the crystalline components, there is als amorphous glass, the content of which depends on the cooling rate of the slags.…”

Section: Slags Formed In Zn-pb Metallurgy Chemical and Mineral Compos...mentioning

confidence: 99%

“…The process produces two types of slag: shaft furnace slag and refining slag. Shaft furnace slag, which is a waste product of the shaft furnace process, due to its physical and chemical properties, especially its high mechanical strength and low solubility in water, is widely used in road construction, for backfilling in the mining industry and for capping waste dumps with an insulating layer [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Summary of major chemistry (in wt%) and minor chemistry (in mg kg −1 ) of Zn-Pb metallurgical slags and Pb refining slags[3,19].…”

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Zinc and Lead Metallurgical Slags as a Potential Source of Metal Recovery: A Review

Nowińska,

Adamczyk

2023

Materials

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This article presents the mineralogical and chemical characteristics of zinc and lead smelting slags, with particular reference to the slags formed during the simultaneous production of Zn and Pb by the Imperial Smelting Process. These slags, because of the presence of many metals in their composition, mainly in the form of crystalline phases, are a valuable source for their extraction. Slags from Zn-Pb metallurgy are processed on an industrial scale using pyrometallurgical and hydrometallurgical methods, alongside which a number of experiments conducted to recover metals as efficiently as possible, including bioleaching experiments.

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Metallurgical Slags in the Environment and Treatment Systems: Insights Regarding Biotic Interactions

Potysz,

Kierczak,

van Hullebusch

2024

Geomicrobiology: Natural and Anthropogenic Settings

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CHAPTER 3. Geochemistry and Mineralogy of Slags

Cited by 7 publications

References 0 publications

Hexavalent chromium release over time from a pyrolyzed Cr-bearing tannery sludge

Hexavalent chromium release over time from a pyrolyzed Cr-bearing tannery sludge

Zinc and Lead Metallurgical Slags as a Potential Source of Metal Recovery: A Review

Metallurgical Slags in the Environment and Treatment Systems: Insights Regarding Biotic Interactions

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