Settling of copper drops in molten slags

Warczok, A.; Utigard, T. A.

doi:10.1007/bf02654001

Cited by 21 publications

(16 citation statements)

References 2 publications

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“…The speed and direction at which a droplet moves are dependent on the composition of both matte/alloy and slag. The effect of electrocapillary motion on entrained matte droplets will be more prominent in DC furnace than in AC furnaces [28,[47][48][49]. Conclusions drawn with regard to interaction between the electric field and surface tension forces that will effect motion yielded the following results:…”

Section: Matte/metal Behaviour In Industrial Furnacesmentioning

confidence: 99%

The recovery of platinum group metals from low-grade concentrates to an iron alloy using silicon carbide as reductant

Malan¹,

Akdogan²,

Bradshaw³

et al. 2015

J. S. Afr. Inst. Min. Metall.

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Section: Matte/metal Behaviour In Industrial Furnacesmentioning

confidence: 99%

The recovery of platinum group metals from low-grade concentrates to an iron alloy using silicon carbide as reductant

Malan¹,

Akdogan²,

Bradshaw³

et al. 2015

J. S. Afr. Inst. Min. Metall.

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“…But the sedimentation of copper phase was not evident when the EPG was up to 1.5 V/cm after 30 minutes. The reason was probably that the migration of copper droplets in electric field was related with the diameter of the droplets [10]. The action of electric field mainly celebrated the concentration of the small copper partials.…”

Section: Copper Content In the Slagmentioning

confidence: 99%

“…The potential gradient value was about 1.2 V·cm -1 when the slag surface tension reached the maximum. According to the Lippmann's equation, 10) the corresponding electrode potential of the maximum value of slag-metal interface tension was the zero charge potential. At the maximum of electrocapillary curve the surface charge density was zero and a droplet does not migrate because there was no tension gradient at the metal-slag interface.…”

Section: Interface Tension and Electrocapillary Motionmentioning

confidence: 99%

“…[6][7][8][9] Vertical electric field could lead to a steep electric potential gradient along the molten slag height and accelerate the migration of copper drops from anode region to the cathode. 9,10) This paper with the objective to determine the settling behaviors of copper for the intensive copper slags under a vertical electric field was therefore initiated. A second purpose was to investigate the copper sedimentation process to get a better understanding of the physical and chemical phenomena occurring in the molten slags.…”

Section: Introductionmentioning

confidence: 99%

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Behaviors of the Molten Copper Slags in the Vertical Electric Field

et al. 2013

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The behaviors of molten copper slag under the vertical electric field were investigated in this paper. The presence of the electric field could accelerate the migration of copper drops from anode region to the cathode. Electrolysis reaction of molten copper slag was occurred at the interface of electrode and the molten slags. The copper slag cleaning process would be promoted in the electric field due to the electrocapillary and a certain degree of electrolysis. The Physical and chemical processes of copper slag cleaning under the vertical electric field was also summarized in the article.

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“…Warczok et al [5,41] report copper droplet sizes ranging from 1 to 25 mm. If we assume similar droplet sizes, we can calculate the percentage of copper that remains at the surface as follows: 1. f Cu can be calculated from Equation 22.…”

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confidence: 98%

Gas Slag Reaction Kinetics in Slag Cleaning of Copper Slags

Chen¹,

Coley²

2006

Canadian Metallurgical Quarterly

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Measurements of the rate constant of CO 2 dissociation on the surface of molten Fe x O-SiO 2 -Al 2 O 3 -Cu 2 O slag have been made by using the 13 CO 2 -CO isotope exchange technique as a function of temperature and imposed equilibrium CO 2 /CO ratio. It is shown that the apparent first-order rate constant remains fixed with Cu 2 O content from 1 to 10 wt% at higher oxygen potentials. The rate constant becomes approximately 2 times higher after metallic copper is reduced from the slag. The effect of temperature in the range from 1200 to 1450 °C on the rate constant was also studied and the activation energy was 190 kJ/mole for slag of composition 60Fe x O-30SiO 2 -10Al 2 O 3 . In the presence of Cu metal, the activation energy was reduced to122 kJ/mole.Résumé -On a effectué des mesures de la constante de vitesse de dissociation du CO 2 à la surface de scorie de Fe x O-SiO 2 -Al 2 O 3 -Cu 2 O fondue en utilisant la technique d'échange de l'isotope 13 CO 2 -CO en fonction de la température et du rapport d'équilibre imposé de CO 2 /CO. On montre que la constante de vitesse apparente du premier ordre demeure fixe pour une teneur en Cu 2 O de 1 à 10% en poids, aux potentiels d'oxygène plus élevés. La constante de vitesse devient approximativement 2 fois plus élevée après réduction du cuivre métallique à partir de la scorie. On a également étudié l'effet de la température sur la constante de vitesse dans la gamme de 1200 à 1450 °C. L'énergie d'activation était de 190 kJ/mole pour la scorie de composition 60Fe x O-30SiO 2 -10Al 2 O 3 . En présence de métal Cu, l'énergie d'activation était réduite à 122 kJ/mole.

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Settling of copper drops in molten slags

Cited by 21 publications

References 2 publications

The recovery of platinum group metals from low-grade concentrates to an iron alloy using silicon carbide as reductant

The recovery of platinum group metals from low-grade concentrates to an iron alloy using silicon carbide as reductant

Behaviors of the Molten Copper Slags in the Vertical Electric Field

Gas Slag Reaction Kinetics in Slag Cleaning of Copper Slags

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