Thermodynamic Properties and Structure of Ferrite Slags and Their Process Implications

Yazawa, Akira; Takeda, Yoichi; Waseda, Yoshio

doi:10.1179/000844381795270354

Cited by 24 publications

(34 citation statements)

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“…Fe 2 O 3 may form the anions FeO + [6,7], FeO − 2 [8], FeO 5− 4 [7,9], Fe 2 O 4− 5 [7,9,10], Fe 2 O 6− 6 [9], and Fe 2 O 8− 7 [9]. The coordination of Fe atoms may be either 4, and/or 6.…”

Section: Resultsmentioning

confidence: 99%

Density and surface tension of the systems CaO-FeO-Fe2O3-MgO, CaO-FeO-Fe2O3-ZnO and CaO-Fe2O3-Cu2O

2006

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Abstract:The density and surface tension of melts of the systems CaO-FeO-Fe 2 O 3 -MgO at the temperature 1623 K, CaO-FeO-Fe 2 O 3 -ZnO at 1573 K, and CaO-Fe 2 O 3 -Cu 2 O at 1573 K were determined using the maximum bubble pressure method. The molar volume, the excess molar volume, and the excess surface tension were calculated on the basis of the obtained data. From these properties information on the interactions of components and possible chemical reactions between them was obtained. Due to the absence of silica and the low concentration of other network-forming oxides, only isolated FeO 5− 4 tetrahedra and the CaO·FeO ionic pairs are formed in these basic melts, the donor of the oxygen atoms being either CaO, FeO, or both CaO+FeO oxides. Even the observed ternary interactions may be attributed to the formation of the anions FeO 5− 4 only.

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Section: Resultsmentioning

confidence: 99%

Density and surface tension of the systems CaO-FeO-Fe2O3-MgO, CaO-FeO-Fe2O3-ZnO and CaO-Fe2O3-Cu2O

2006

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“…Also given is a line representing the CoO at an oxygen partial pressure of 1 ϫ 10 Ϫ7 atm. In the correlation by Yazawa et al [4] for cobalt-free slags, which second, a Ptϳ5 pct Co alloy foil was used so that equilibrium was determined from their relation: could be approached from the opposite direction. The results log (Fe 3ϩ /Fe 2ϩ ) ϭ 0.17 log (p O 2 ) [1] from these experiments are given in Figure 2, where it can be seen that equilibrium between the metal and slag was ϩ 0.018 (CaO wt pct) ϩ (5,500/T ) Ϫ 2.52 reached within 20 hours.…”

Section: Discussionmentioning

confidence: 99%

“…[4] No information was available for the calcium iron silicate slags. Therefore, samples of those slags given in Table II were used in the drop-quench experiments at the same oxygen partial pressure and temperature as used for equilibrium.…”

Section: Methodsmentioning

confidence: 99%

“…It was thus decided to use a reaction time of 48 hours for subsequent experiments. Some experiments with cobalt-free slags were used to check the actual oxygen partial pressure against the equation of Yazawa et al [4] and the estimated error in the oxygen partial pressure is Ϯ0.2 ϫ 10 Ϫ7 atm at 1573 K.…”

Section: Methodsmentioning

confidence: 99%

“…Recent work on continuous converting of copper those found by Takeda et al [5] They attributed this to uncerconcentrate into blister copper in a single step has led to tainties in the thermodynamic data, the possible influence the development of a slag practice, which is also based on of dissolved copper oxide in the slag used by Takeda et calcium ferrite. [3] According to Yazawa et al, [4] calcium al., [5] and the possibility of errors in the experimental data ferrite slag is likely to be used by more nonferrous smelters caused by entrained metal droplets. Nagamori et al [6] conin the future because it has several benefits over traditional cluded that "both theory and experiment seem to have room iron silicate slag.…”

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confidence: 99%

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A thermodynamic study on cobalt containing calcium ferrite and calcium iron silicate slags at 1573 K

Teague

Swinbourne

Jahanshahi

2001

Metall Mater Trans B

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Redox equilibria, activities of cobalt, iron and their oxides in calcium ferrite and calcium ironsilicate slags, were measured through metal-slag-gas equilibrium experiments under controlled oxygen potentials (10 Ϫ7 to 3 ϫ 10 Ϫ7 atm) at 1573 K. Results on the redox equilibria show that addition of CoO to calcium ferrite slag increases the equilibrium Fe 3+ /Fe 2+ ratio in these melts. Measured activities of CoO and FeO showed positive deviations from ideal behavior, while that of Fe 2 O 3 showed negative deviation. Partial substitution of CaO by SiO 2 , by up to 4 wt pct SiO 2 in the calcium ferrite based melts, resulted in increases in the activity coefficients of CoO and Fe 2 O 3 . Phase equilibria studies on the cobalt containing CaO-FeO-Fe 2 O 3 -SiO 2 slags were also carried out using the drop-quench technique. Good agreement between the activity data and the liquidus temperature with respect to magnetite solid solution containing CoO was observed.

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Metal Solutions, Slags and Mattes

Vignes¹

2013

Extractive Metallurgy 1

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Thermodynamic Properties and Structure of Ferrite Slags and Their Process Implications

Cited by 24 publications

References 0 publications

Density and surface tension of the systems CaO-FeO-Fe2O3-MgO, CaO-FeO-Fe2O3-ZnO and CaO-Fe2O3-Cu2O

Density and surface tension of the systems CaO-FeO-Fe2O3-MgO, CaO-FeO-Fe2O3-ZnO and CaO-Fe2O3-Cu2O

A thermodynamic study on cobalt containing calcium ferrite and calcium iron silicate slags at 1573 K

Metal Solutions, Slags and Mattes

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