Molten slag conference Heo
in view of the reaction mechanism of lead dissolution into the slag. Furthermore the lead capacity of the slag was estimated from the experimental results. The distribution ratio of lead (LPb) decreases with increasing amount of CaO ( 6wt ) irrespective of Fe/SiO2 ratio (1.4 1.7). However the addition of alumina in the slag
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A DOCUMENTARY STUDY ON ALUMINA EXTRACTION
silica to form dicalcium silicate a low solubility compound in alkaline solu-tions alumina combines with soda or lime to form sodium aluminate or calcium aluminate which are soluble in alkaline solutions. Alumina is extracted from the sinter by alkaline leaching leaving a di-calcium silicate residue.
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(PDF) Study of the Deskulling Problem of Tundishes in
This along with XRD analysis suggested that slag reacted with silicate phases during the dissolution process to form Akermanite (2CaO.MgO.2SiO 2 ) and calcium magnesium aluminium oxide. Dissolution at refractory/ slag interfaces is governed by chemical reaction (or solution) at the interface or transport (or diffusion) of reacting species
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Dissolution Behavior of Al2O3 Inclusions in CaO-Al2O3
dissolution rate and the rate-limiting step is the di usion of alumina in the boundary layer with the solid alumina first reacting with lime to form two intermediate phases CaO 2Al2O3 and CaO 6Al2O3 and finally dissolving into the slag in the form of an aluminum polymer. Keywords Al2O3 dissolution behavior aluminate slag intermediate
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Molten slag conference Heo
in view of the reaction mechanism of lead dissolution into the slag. Furthermore the lead capacity of the slag was estimated from the experimental results. The distribution ratio of lead (LPb) decreases with increasing amount of CaO ( 6wt ) irrespective of Fe/SiO2 ratio (1.4 1.7). However the addition of alumina in the slag
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Influence of alumina on mineralogy and environmental
An iron-silicate slag from a zinc-copper smelting process and mixtures of this slag with 5wt 10wt and 15wt alumina addition were re-melted semi-rapidly solidified and characterized using scanning electron microscopy equipped with energy dispersive spectroscopy and X-ray diffraction. The FactSage™6.2 thermodynamic package was applied to compare the stable phases at equilibrium
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Application of Ca-based geopolymer with blast furnace
the hydration of Portland cement paste into calcium silicate hydrate written CSH. 7 12 13 Instead of the simple dimer Ca-di-siloxonate hydrate typical for CSH Richardson et al . 6 suggest the incorporation of a bridging function for the aluminium
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Lime Dissolution in Foaming BOF SlagSpringer
Jun 25 2018 · difference between lime dissolution in foaming slag compared to its dissolution in pure liquid slag. II. EXPERIMENTS The slag evolution in the BOF process can be divided into two main periods viz. an early stage when the FeO content is above 40 wt pct and a later stage when the FeO content has decreased to 20 to 25 wt pct due to the
Get PriceProceedings of the 5th Slag Valorisation Symposium
slag. A decrease in the number -O-Si-O- bonds in the slag increases the dissolution of Si and Al species into solution which are required for the formation of the binding gels network structure. However depolymerisation of the slag is not wholly compositionally dependant and can be affected by the quench rate of the slag during cooling.
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INCLUSIONS IN CONTINUOUS CASTING OF STEEL
Fig. 6 Alumina inclusions formed during the deoxidation of LCAK steel (left flower-like plate alumina right aggregation of small polyhedral particles) 44) Silica inclusions are generally spherical owing to being in a liquid or glassy state in the molten steel. Silica can also agglomerate into
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Corrosion mechanism of polycrystalline corundum and
May 01 2009 · Recently Zhang et al. 17 studied the dissolution of commercial white fused and tabular alumina grains into a model silicate slag at 1450 °C and 1600 °C. These authors observed the formation of calcium hexaluminate CaAl 12 O 19 and a hercynite spinel layer FeAl 2 O 4 at all alumina/slag interfaces.
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Effect of Marangoni‐induced flow on the rate of refractory
Dissolution rate of silica rods in iron‐saturated silicate slags containing 15–30 SiO 2 was measured using the rotating cylinder technique at 1300°C under a controlled atmosphere of deoxidized Ar‐gas. These measurements were aimed at quantifying the magnitude of Marangoni‐induced flow near the slag–refractory region.
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A phase‐field model for the study of isothermal
Request PDF A phase‐field model for the study of isothermal dissolution behavior of alumina particles into molten silicates Particle dissolution process refers to the dissolving of one
Get Price(PDF) Study of the Deskulling Problem of Tundishes in
This along with XRD analysis suggested that slag reacted with silicate phases during the dissolution process to form Akermanite (2CaO.MgO.2SiO 2 ) and calcium magnesium aluminium oxide. Dissolution at refractory/ slag interfaces is governed by chemical reaction (or solution) at the interface or transport (or diffusion) of reacting species
Get PriceDissolution Behavior of Al2O3 Inclusions in CaO-Al2O3
dissolution rate and the rate-limiting step is the di usion of alumina in the boundary layer with the solid alumina first reacting with lime to form two intermediate phases CaO 2Al2O3 and CaO 6Al2O3 and finally dissolving into the slag in the form of an aluminum polymer. Keywords Al2O3 dissolution behavior aluminate slag intermediate
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CNBProcess for Bayer process aluminum oxide
The invention discloses a process for Bayer process aluminum oxide production by replacing carbide slag with lime belonging to the technical field of solid waste treatment. Waste-carbide slag of a chemical plant is prepared into carbide slag emulsion with a certain effective calcium content through mixing and stirring with settled washing liquor or hot water the prepared carbide slag
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dissolution of C into the molten steel. Once the carbon has been removed the refractory is able to be wetted by the slag so that penetration and spalling of the decarburized layer can occur. Dissolution at refractory/slag interfaces is governed by (a) chemical-reaction (or solution) at the interface or (b)
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Preparation of Silica-Alumina Nanoparticles via Blast
converted into carbonates in the presence of CO2 1 . Steel slag an industrial byproduct has been used as an attractive feedstock for CO2 sequestration because its chemical composition resembles those of silicate minerals and the steel industry is known to be one of the biggest emitters of anthropogenic CO2 2 . Korea is the world s fifth
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Thermodynamic Stability of Spinel Phase at the Interface
Abstract. The interfacial reaction between alumina refractory and CaO-CaF2-SiO2-Al2O3-MgO-MnO slag was observed at 1873K to estimate the stability of the spinel phase using computational thermodynamics under refining conditions of Mn-containing steels.
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Dissolution in Ceramic Systems I Molecular Diffusion
Abstract. Measurements of the rate of dissolution of single crystals of sapphire in molten CaO-A1 2 O 3-SiO 2 slag from 1340° to 1550°C under conditions of molecular diffusion free convection and forced convection reveal that the rate of dissolution was controlled by transport in the molten silicate. The results were self-consistent in that the independently calculated apparent binary
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(PDF) Experimental Analysis of Non-Destructive Testing
In order to reduce the CO2 emission by the concrete into the atmosphere an alternative binder for the concrete was developed by Davidovits in the year 1978 i.e. geopolymer technology 6 . Geopolymer concrete is produced by the alkali activation of silicon and aluminium
Get PriceMOLTEN2012 steel research international Vol 84 No 7
The sulphide capacities of the CaO–SiO 2 –MnO(–Al 2 O 3 –MgO) slags are measured at 1873 K using a gas–slag equilibration method. The effects of MnO and the MnO↔CaO substitution on the sulphide capacity of molten slag are also investigated based on the structural view of silicate melts.
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Alumina Dissolution into Silicate SlagZhang2000
Dec 21 2004 · Dissolution of commercial white fused and tabular Al 2 O 3 grains into a model silicate slag was investigated after 1 h at 1450° and 1600°C. Formation of CA 6 and hercynitic spinel layers was observed at all Al 2 O 3 /slag interfaces. The spinel layer was not always continuous and so compared with the CA 6 layer it had a less‐significant effect on the dissolution process.
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Interaction of Aluminum Metaphosphates in the Setting of
May 28 2020 · 1 Introduction. Potassium silicate solutions also known as potassium water glasses are colloidal potassium silicates sols with a typical molar SiO 2 /K 2 O ratio ranging from 2.5 to 4.5. 1 They are used in industrial applications as acid‐resistant mortars and cements. They are main components for industrial floors and concretes in the field of construction chemistry 2 as well as in
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Active Tundish SlagPyrometallurgy
Dissolution of alumina and MgO·Al. 2. O. 3. inclusions into slag were studied by model experiments applying CLSM and DHTT methods. Viscosity of slags was measured by rotating cylinder method at different temperatures. Interfacial tension between steel and slag were measured by drop weight method for several slag/steel systems.
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Corrosion in high alumina refractory serviced in a bench
Jan 15 2021 · Silicate and aluminosilicate which contain Na Ca in the slag and iron oxide plays a fluxing role forming low temperature eutectic material with corundum on the surface and promoting the dissolution of corundum into the slag. After dissolving into the slag the aluminum in the slag will migrate out to the slag flowing on the wall driven by
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Corrosion in high alumina refractory serviced in a bench
Jan 15 2021 · Silicate and aluminosilicate which contain Na Ca in the slag and iron oxide plays a fluxing role forming low temperature eutectic material with corundum on the surface and promoting the dissolution of corundum into the slag. After dissolving into the slag the aluminum in the slag will migrate out to the slag flowing on the wall driven by
Get PriceConversion of Aluminum Dross Residue into Value-Added
This study utilized aluminum dross residue obtained from secondary process of aluminum production as the main component in the fabrication of ceramic refractories. The amount of residue varied in the range 60-90 wt and other components in the ceramic formulations were a combination of alumino-silicate based clays. Alpha-alumina a-Al2O3 was the main crystalline phase found in all sintered
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Conversion of Aluminum Dross Residue into Value-Added
This study utilized aluminum dross residue obtained from secondary process of aluminum production as the main component in the fabrication of ceramic refractories. The amount of residue varied in the range 60-90 wt and other components in the ceramic formulations were a combination of alumino-silicate based clays. Alpha-alumina a-Al2O3 was the main crystalline phase found in all sintered
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