Removing impurities from steel scrap using air and chlorine mixtures

Tee, J. K. S.; Fray, D. J.

doi:10.1007/s11837-999-0237-x

Cited by 20 publications

(14 citation statements)

References 7 publications

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“…These days, the selective chlorination and evaporation processes with the use of waste polyvinyl chloride (PVC) have been proposed by some researchers [4][5][6][7][8][9][10][11] for the treatment of EAF dust. 4 Pa) has been measured at 1 073 K by gravimetry and the effects of partial pressures of chlorine and oxygen on the chlorination and evaporation rates have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Removal of Zn and Pb from Fe2O3–ZnFe2O4–ZnO–PbO Mixture by Selective Chlorination and Evaporation Reactions

2006

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Section: Introductionmentioning

confidence: 99%

Removal of Zn and Pb from Fe2O3–ZnFe2O4–ZnO–PbO Mixture by Selective Chlorination and Evaporation Reactions

2006

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“…Recently, a new zinc and lead recovery process from EAF dust has been proposed by some researchers, [5][6][7][8][9][10][11][12] in which zinc and lead in the dust react with waste polyvinyl chloride to form these metal chlorides. Steelmaking dusts mainly contain iron, lead and zinc oxides.…”

Section: Introductionmentioning

confidence: 99%

Chlorination Kinetics of ZnFe2O4 with Ar-Cl2-O2 Gas

2006

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Chlorination rate of ZnFe 2 O 4 with Ar-Cl 2 -O 2 gas was measured at 1023 to 1123 K by gravimetry. The effects of temperature, partial pressures of chlorine and oxygen on the rate were investigated. Zinc oxide contained in ZnFe 2 O 4 specimen was selectively chlorinated and evaporated in gas, while iron oxide remained as oxide in a chlorinated residue. Chlorination rate increased with increasing partial pressure of chlorine. On the other hand, chlorination rate slightly decreased with increasing partial pressure of oxygen and chlorination of iron oxide was prevented. Since the order of chlorination rate with respect to partial pressure of chlorine was approximately 0.5, the rate-determining step of chlorination is considered to be the dissociative adsorption of chlorine gas on the surface of solid ZnFe 2 O 4 . Decrease of chlorination rate with the increase of partial pressure of oxygen could be explained by the occupation of adsorption sites of chlorine atoms by oxygen and the chlorination rate was expressed as functions of partial pressures of chlorine and oxygen asO2 Þ The activation energy of chlorination was 35:1 AE 2:2 kJ/mol which is relatively small compared to that of ZnO chlorination reaction (58.2 kJ/mol). It is considered that this low activation energy is due to the weak adsorption of chlorine atom on the adsorption site.

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“…On the other hand, waste polyvinyl chloride also could be utilized as chlorinating agent and some investigations are reported. [7][8][9][10][11][12][13] Stable phase of Fe is oxide, and those of Zn and Pb are chlorides in high partial pressures of oxygen and chlorine, hence heavy metals could be selectively chlorinated and separated from iron oxide. Heavy metals removal, especially for Pb and Cd, is also an important issue in the treatment process of bottom ash or fly ash generated by municipal solid waste incineration process.…”

Section: Introductionmentioning

confidence: 99%

Chlorination and Evaporation Behaviors of PbO-PbCl2 System in Ar-Cl2-O2 Atmosphere

Matsuura

Tsukihashi

2005

ISIJ Int.

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Removing impurities from steel scrap using air and chlorine mixtures

Cited by 20 publications

References 7 publications

Removal of Zn and Pb from Fe2O3–ZnFe2O4–ZnO–PbO Mixture by Selective Chlorination and Evaporation Reactions

Removal of Zn and Pb from Fe2O3–ZnFe2O4–ZnO–PbO Mixture by Selective Chlorination and Evaporation Reactions

Chlorination Kinetics of ZnFe<SUB>2</SUB>O<SUB>4</SUB> with Ar-Cl<SUB>2</SUB>-O<SUB>2</SUB> Gas

Chlorination and Evaporation Behaviors of PbO-PbCl2 System in Ar-Cl2-O2 Atmosphere

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