Effect of NaCl, KCl and CaCl2 Contained in MSW Molten Fly Ashes on Chloride Volatilization of Heavy Metals

勝也, 中山; 善直, 田島; 賀夫, 水野; 義弘, 小島; 仁樹, 松田; 満, 高田

doi:10.1252/kakoronbunshu.30.778

Cited by 14 publications

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References 10 publications

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“…Therefore, in our previous study, the effect of inorganic chlorides on volatilization and separation of lead, zinc, and copper from molten fl y ash was studied using model fl y ash. 17 As a result, the volatilization of heavy metals was found to increase with addition of inorganic chlorides and the increase became higher in order CaCl 2 > NaCl > KCl. 17 In addition to the inorganic chlorides, molten fl y ash also contains a large amount of unburned carbon, and thus it was considered that heavy metals present in oxidized forms could be reduced to their metallic forms by reaction with the unburned carbon.…”

Section: Introductionmentioning

confidence: 95%

“…17 As a result, the volatilization of heavy metals was found to increase with addition of inorganic chlorides and the increase became higher in order CaCl 2 > NaCl > KCl. 17 In addition to the inorganic chlorides, molten fl y ash also contains a large amount of unburned carbon, and thus it was considered that heavy metals present in oxidized forms could be reduced to their metallic forms by reaction with the unburned carbon. Therefore, it is important to clarify the effect of unburned carbon present in molten fl y ash on the chloride-induced volatilization of heavy metals.…”

Section: Introductionmentioning

confidence: 95%

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Effect of unburned carbon on lead, zinc, and copper recovery from molten fly ash by chloride-induced volatilization

Nakayama

Kuchař

Sakai

et al. 2008

J Mater Cycles Waste Manag

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The present work focuses on investigation of the effective recovery of heavy metals from molten fl y ash by applying chloride-induced volatilization. In particular, the effect of unburned carbon on the chloride-induced volatilization of lead, zinc, and copper from model and real molten fl y ashes was investigated in the temperature range 873-1173 K under a N 2 atmosphere. As a result, almost 100% of lead and a signifi cant proportion of zinc were volatilized from the real molten fl y ash samples at 1173 K. In contrast, for the model fl y ash, volatilization ratios of lead and zinc at 1173 K were only 85% and 25%, respectively. Further, the results of X-ray diffraction analysis suggested that PbO in molten fl y ash was converted either to Pb 2 OCl 2 or Pb by respective chlorination and reduction reactions. Meanwhile ZnO and CuO in the molten fl y ash were reduced to Zn and Cu by reaction with unburned carbon. Subsequently, Pb, Zn, and Pb 2 OCl 2 were volatilized, but Cu remained in the solid residue. Finally, the volatilization ratio of zinc increased with the addition of carbon, and more than 98% of zinc was volatilized at 1173 K from a fl y ash with a carbon content of 20%.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

Effect of unburned carbon on lead, zinc, and copper recovery from molten fly ash by chloride-induced volatilization

Nakayama

Kuchař

Sakai

et al. 2008

J Mater Cycles Waste Manag

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A Novel Technique for Preparation and Separation of Iron Carbide from Sintering Dust

Lv,

Chen

2024

steel research int.

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Sintering dust is a typical refractory secondary iron resource. A technology‐based utilization of sintering dust as iron carbide by applying chlorination, carburization, and magnetic separation is proposed. Under optimized conditions, an electric furnace burden comprised of 83.51% Fe and 6.52% C and with a corresponding iron recovery rate of 81.21% is prepared. Meanwhile, 96.97% Pb can be removed by chlorination and magnetic separation. Furthermore, the separation mechanism is revealed using scanning electron microscopy, X‐ray powder diffraction, and optical microscopy. The results show that sodium sulfate can promote the carburizing efficiency of sintering dust, strengthen the growth of iron carbide particles, and improve the embedding relationship between iron carbide and gangue minerals, which significantly promotes the separation efficiency. The study demonstrates that the preparation of iron carbide from sintering dust using the proposed technology is a feasible method.

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Dynamic studies on lead volatilization from CaO–SiO2–Al2O3 molten slag under N2–CO–CO2, N2–HCl and N2–H2S gas atmospheres

Matsuda

Kageyama

Kawaguchi

et al. 2014

J Mater Cycles Waste Manag

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Effect of NaCl, KCl and CaCl2 Contained in MSW Molten Fly Ashes on Chloride Volatilization of Heavy Metals

Cited by 14 publications

References 10 publications

Effect of unburned carbon on lead, zinc, and copper recovery from molten fly ash by chloride-induced volatilization

Effect of unburned carbon on lead, zinc, and copper recovery from molten fly ash by chloride-induced volatilization

A Novel Technique for Preparation and Separation of Iron Carbide from Sintering Dust

Dynamic studies on lead volatilization from CaO–SiO2–Al2O3 molten slag under N2–CO–CO2, N2–HCl and N2–H2S gas atmospheres

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