Experimental study of phase equilibria in the systems Fe-Zn-O and Fe-Zn-Si-O at metallic iron saturation

Jak, Evgueni; Zhao, Baojun; Hayes, Peter C.

doi:10.1007/s11663-000-0006-2

Cited by 47 publications

(57 citation statements)

References 8 publications

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“…[16][17][18][19][20] The slag samples were prepared from the following chemicals, obtained from Sigma-Aldrich Pty. Ltd. (Australia): 99ϩ% MgO, 99.9ϩ% SiO 2 , 99.9ϩ% iron powder and 99.98ϩ% Fe 2 O 3 .…”

Section: Methodsmentioning

confidence: 99%

Phase Equilibria in the Cristobalite, Tridymite and Pyroxene Primary Phase Fields in the MgO-"FeO"-SiO2 System in Equilibrium with Metallic Iron

2005

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Experimental studies have been carried out to determine the phase equilibria for the ternary MgO-"FeO"-SiO 2 in equilibrium with metallic iron. Liquidus isotherms have been determined in the temperature range from 1 578 to 1 898K in the silica and pyroxene primary phase fields using high temperature equilibration, modified quenching and electron probe X-ray microanalysis (EPMA) techniques.KEY WORDS: slag; liquidus; phase equilibria; MgO-"FeO"-SiO 2 system. study by Bowen and Schairer 1) and to extend the investigated range of compositions and temperatures. ExperimentalThe experimental procedure used in this investigation has been described in detail in previous publications by the authors. [16][17][18][19][20] The slag samples were prepared from the following chemicals, obtained from Sigma-Aldrich Pty. Ltd. (Australia): 99ϩ% MgO, 99.9ϩ% SiO 2 , 99.9ϩ% iron powder and 99.98ϩ% Fe 2 O 3 . The chemicals were mixed in an agate mortar to the required compositions. 15 % excess Fe powder (Ͻ10 mm in size) was added to the slag samples to ensure that free metallic iron is always present in and dispersed throughout the slag. About 0.3 g of the mixture was pelletized and placed in molybdenum foil (over 99.9 % Mo, 0.025-mm thick) or iron foil (over 99.9 % Fe, 0.1-mm thick) envelopes. Equilibration experiments were carried out in a vertical lanthanum chromite furnace (PYROX, France) having a recrystallised alumina reaction tube. The furnace temperature was controlled within Ϯ1 K. A B-type Pt/30wt% Rh-Pt/13wt% Rh thermocouple was inserted into the hot zone within the reaction tube. The thermocouple was calibrated against a reference thermocouple supplied by National Measurement Laboratory (CSIRO, Melbourne, Australia). The overall temperature accuracy was estimated to be within Ϯ2 K.The sample was first placed in a Mo dish suspended by a Mo wire, and positioned in the low temperature zone at the bottom end of the furnace, and the bottom end of the reaction tube was sealed with a thin polymer film. Ultra high purity Argon gas (total impuritiesՅ5 ppm, O 2 Յ1 ppm) was passed through the reaction tube for 30 min to remove air; the sample was then raised into the hot zone adjacent to the thermocouple. The experiments were carried out in two steps. The first step was to completely premelt the sample; heating the slag above the liquidus temperature to ensure the sample is homogeneous. The second step was to equilibrate the sample at the desired temperature. After equilibration the suspension wire was released and the sample quenched directly into stirred bath of cold water. Using this rapid cooling approach the liquid molten oxide phase at the equilibration temperature is retained as a glass of the same composition at room temperature. The solid phases present at the equilibration temperature are also retained in the same crystal structure and compositions by rapid cooling to room temperature.The quenched samples were mounted and polished for analysis. The polished samples were initially examined using optical microscopy and scanning...

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Section: Methodsmentioning

confidence: 99%

Phase Equilibria in the Cristobalite, Tridymite and Pyroxene Primary Phase Fields in the MgO-"FeO"-SiO2 System in Equilibrium with Metallic Iron

2005

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“…[14][15][16][17][18] The slag samples were prepared from high purity oxide powders (over 99.5 %). 15 % excess Fe powder (Ͻ10 mm in size) was added to the slag samples to ensure that free metallic iron is always present in and dispersed throughout the slag.…”

Section: Methodsmentioning

confidence: 99%

Phase Equilibria in the Olivine Primary Phase Field in the MgO-"FeO"-SiO2 System in Equilibrium with Metallic Iron

2005

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“…In contrast, fayalite from base-metal slag produced by historical Cu smelting at Penn Mine in California contains on average 6.83 wt % ZnO and 8.63 wt % MgO [24]. The range of Zn/Fe ratios of the willemite and fayalite indicates that a solid solution characterizes each assemblage [19,25,26] (Figure 4). The intermediate type between assemblages I and II was found in the fractured slag, which contains primary phases that are mainly dendritic willemite and fayalite that appear to have crystallized simultaneously.…”

Section: Olivine and Spinel Group Phasesmentioning

confidence: 99%

Primary Phases and Natural Weathering of Smelting Slag at an Abandoned Mine Site in Southwest Japan

Sueoka

Sakakibara

2013

Minerals

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Artisanal metallurgical slag produced more than 50 years ago at a mine site in southwest Japan is rich in toxic metals and metalloids. Some of the slag remains on a waste dump and could contaminate the surrounding area through the dissolution of heavy metals and metalloids during weathering. To assess this risk, this study has investigated the behavior of the toxic elements in the smelting slag during weathering. Most of the potentially toxic elements are contained in willemite and/or matte drops. Maximum metal and metalloid concentrations in the slag are 28.1 wt % Fe, 22.7 wt % Zn, 1.63 wt % Cu, 3450 mg/kg Sn, 826 mg/kg Pb, 780 mg/kg As, and 116 mg/kg Cd. Zn is mainly contained in willemite, whereas other metals and metalloids are mainly concentrated in matte drops. The willemite and matte drops are converted to Fe-hydroxides during weathering, indicating that potentially toxic metals and metalloids contained in these phases are released by weathering processes. Therefore, weathering of the artisanal metallurgical slag, containing large amounts of willemite and matte drops, may pollute the surrounding environment.

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Experimental study of phase equilibria in the systems Fe-Zn-O and Fe-Zn-Si-O at metallic iron saturation

Cited by 47 publications

References 8 publications

Phase Equilibria in the Cristobalite, Tridymite and Pyroxene Primary Phase Fields in the MgO-"FeO"-SiO2 System in Equilibrium with Metallic Iron

Phase Equilibria in the Cristobalite, Tridymite and Pyroxene Primary Phase Fields in the MgO-"FeO"-SiO2 System in Equilibrium with Metallic Iron

Phase Equilibria in the Olivine Primary Phase Field in the MgO-"FeO"-SiO2 System in Equilibrium with Metallic Iron

Primary Phases and Natural Weathering of Smelting Slag at an Abandoned Mine Site in Southwest Japan

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