Electric arc furnace flue dusts: characterization and leaching with sulphuric acid

Cruells, M.; Roca, A.; Núñez, C.

doi:10.1016/0304-386x(92)90119-k

Cited by 97 publications

(36 citation statements)

References 2 publications

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“…Due to the industrial importance, several techniques have been developed or proposed as the intermediate treatment process based on the hydro-metallurgical process, 1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17] carbothermic reduction, 18) iron-reduction distillation process of zinc oxide in the dust, 19,20) chlorination of heavy metals with PVC 21) and so on. In addition, fundamental studies on the characterization of the dust components, 22) behavior of halogens during the carbothermic reduction, 23) thermodynamic simulation on the selective carbothermic reduction of dust components, 24) reutilization of the dust as a catalyst of waste water treatment, 25) suppression of dust generation in EAF operation 26) have also been reported.…”

Section: Introductionmentioning

confidence: 99%

New EAF Dust Treatment Process with the Aid of Strong Magnetic Field

et al. 2008

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A new EAF dust treatment process named as "Lime Addition and Magnetic Separation Process (LAMS Process)" has been proposed to recover zinc oxide from the dust and to use solid residue as a flux for steel refining. The LAMS Process consists of the reaction of EAF dust with CaO followed by the adequate crushing and high gradient magnetic separation. The basic principle of this process has been established by revealing the phase equilibria in the CaO-Fe 2 O 3 -ZnO system where Ca 2 Fe 2 O 5 can be in equilibrium with pure ZnO rather than ZnFe 2 O 4 , which is the major component of EAF dust, at higher CaO region. The conversion of zinc ferrite in EAF dust to ZnO and Ca 2 Fe 2 O 5 has been experimentally demonstrated by heating the dust with double molar amount of CaO at 1 173 and 1 373 K. It has also been demonstrated that the formed ZnO and Ca 2 Fe 2 O 5 can be separated by the strong magnetic field. Therefore, it may be possible to recover ZnO from EAF dust without the carbothermic reduction like Waelz process.

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Section: Introductionmentioning

confidence: 99%

New EAF Dust Treatment Process with the Aid of Strong Magnetic Field

et al. 2008

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“…The mineralogy of the EAF dust is varied and complex. [13][14][15][16] The most common phases are solid solution of the iron spinels which are enclosed within a matrix of calcium-iron-silicate glass (Fig. 3).…”

Section: Microscopic Examinationmentioning

confidence: 99%

The Strength and the High Temperature Behaviors of Self-reducing Pellets Containing EAF Dust.

Mantovani

Takano

2000

ISIJ International

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The objective of this work was to study the cold and hot behaviors, that is, cold compressive strength, decrepitation, swelling, compressive strength after heating and efficiency of zinc removal of self-reducing pellets containing coal fines and EAF dust. Pellets with 3 and 5 wt% Portland cement, 12 wt% CaCO 3 and without additive were produced. The effect of binder addition on the cold compressive strength was studied during 28 days. For the study of the high temperature behavior, pellets were submitted to thermal cycles with different heating intensities. The best results of cold compressive strength were obtained with 5 and 3 wt% Portland cement due to hydration of components that are contained in this binder. Pellets with Portland cement (3 and 5 wt%), after drying, did not present decrepitation, showing a correlation between the decrepitation, moisture content and mechanical strength of the pellet. Abnormal swelling was observed in pellets submitted to the thermal cycle with lower heating intensity. Such abnormal swelling was due to the growth of whiskers, and as consequence, it was recorded a maximum swelling (higher than 30 %). With the gasification of carbon promoted by the release of H 2 O (g) and CO 2(g) from the Portland cement and CaCO 3 , it was possible to obtain a higher zinc removal as compared to the value obtained with pellets without additives, mainly at 1 124°C.

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“…To address these problems, researchers have proposed treatment measures, such as chemical stabilization or ferrous and nonferrous metal recovery (e.g., pyrometallurgical or hydrometallurgical processes). 9,10,[15][16][17][18][19] Furthermore, EAF dust is involved in the formation of hazardous Cl-compounds, such as polychlorinated dibenzodioxins, polychlorinated dibenzofurans, and hexachlorobenzene. 6) The formation these compounds can be decreased or pre-…”

Section: Introductionmentioning

confidence: 99%

Treatment of Hazardous Waste by Carbon Dioxide Capture from an Electric Arc Furnace

Leon

Cantú

Villarreal³

et al. 2015

ISIJ Int.

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The steel industry is important for the development of several economic activities in the world. Unfortunately, the electric arc furnace (EAF) used in production generates byproducts such as dust, which must be treated and confined to prevent pollution. In this study, the alkaline properties of solutions prepared with EAF dust were evaluated for use in CO2 capture. A process in which dust solution properties are regarded as an advantage is proposed. The results indicate that the developed process effectively minimizes operational problems. Specifically, the process neutralizes several hazardous pollutants contained in EAF dust, reduces CO2 emissions, and directly removes dioxin-forming dust from the exit gas stream.KEY WORDS: CO2 capture; steelmaking industry; electric arc furnace dust.

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Electric arc furnace flue dusts: characterization and leaching with sulphuric acid

Cited by 97 publications

References 2 publications

New EAF Dust Treatment Process with the Aid of Strong Magnetic Field

New EAF Dust Treatment Process with the Aid of Strong Magnetic Field

The Strength and the High Temperature Behaviors of Self-reducing Pellets Containing EAF Dust.

Treatment of Hazardous Waste by Carbon Dioxide Capture from an Electric Arc Furnace

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