Deciphering the corrosion puzzle: Nano-iron-biochar composite – Not a quick fix for metal immobilization in peat soils

Pankratov, Denis A.; Dovletyarova, Elvira A.; Zhikharev, Alexander P.; Gusev, Alexander; Yáñez, Carolina; Neaman, Alexander

doi:10.1016/j.apgeochem.2024.105982

Cited by 1 publication

(1 citation statement)

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“…Moreover, as shown by our preliminary experiments, the presence of the low-magnetic phases leads to a significant retaining iron in the tailings even using high-gradient magnetic separation at a magnetic field strength of 8-16 kOe. Certainly, the formation of goethite and lepidocrocite is improbable during high-temperature treatment in the Waelz kiln, but they are likely the main corrosion products of metallic iron [75][76][77] during storage of the Waelz slag in stockpiles or dumps. Therefore, in the case of magnetic separation, it is important to process the slag immediately after its formation in the kiln.…”

Section: Discussionmentioning

confidence: 99%

The Waelz Slag from Electric Arc Furnace Dust Processing: Characterization and Magnetic Separation Studies

Grudinsky,

Yurtaeva,

Pankratov

et al. 2024

Materials

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The Waelz slag generated during electric arc furnace dust processing is an iron-rich product with significant amounts of iron, zinc and copper. About 600–800 kg of the Waelz slag is generated per ton of the dust processed. The Waelz slag samples from two different plants were thoroughly characterized using inductively coupled plasma optical emission spectroscopy (ICP-AES), X-ray diffraction analysis (XRD), chemical phase analysis, Mössbauer spectroscopy and other supporting methods. The phase distribution of iron, zinc and copper was determined in the Waelz slag samples. Low-intensity wet magnetic separation was tested for the iron recovery from the Waelz slag samples. It was found that the Waelz slag samples have complex chemical and mineralogical compositions, which can impede the selective recovery of valuable elements. The obtained results indicate that the chemical and mineralogical composition of the Waelz slag samples has a considerable effect on the magnetic separation indexes. The experiments showed that the iron concentrates with Fe contents of 73% and 46.8% with the metallization degrees of 87.2% and 57.5% and the iron recovery degree of 54.8% and 52.9% were obtained at optimal conditions for two different samples, respectively, without selective segregation of Cu and Zn in the magnetic or non-magnetic fraction.

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Section: Discussionmentioning

confidence: 99%