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Abstract

Electric furnace dust and filter cake collected from a stainless steel plant as well as EF dust collected from a ferrochrome plant were characterised. Electric furnace dusts consist of very fine particles, from which Cr(VI) can be leached by shallow groundwater. When heated in air H₂O, CO₂, SO₂, SO₃, fluorine, calcium and silicon are expelled from these materials, while metallic particles oxidise. The main phases present in the stainless steel plant dust are the (Mg, Fe, Mn, Cr)₃O₄ spinel phase, quartz, Ca(OH)₂ and nickel. The coarse fraction of ferrochrome dust mainly contains chromite and partly altered chromite, quartz and carbon, while the main components of the fine fractions of ferrochrome dust are chromite, SiO₂, ZnO, NaCl and Mg₂SiO₄. CaF₂ is the major phase in the filter cake. Cr(VI) containing phases are possibly generated at the top of the submerged arc furnace or in the off gas duct, as Cr(VI) is found on the surface of the dust.

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Cr(VI) containing electric furnace dusts and filter cake from a stainless steel waste treatment plant: Part 1 – Characteristics and microstructure

Abstract

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