Spent MgO-carbon refractory bricks as a material for
Spent magnesia (MgO)-carbon refractory bricks were repurposed as a permeable reactive barrier reactive media to treat a nickel (5 mg l−1)- and cobalt (0.3 mg l−1)-contaminated groundwater. MgO has been used for decades as a heavy metal precipitating agent as it hydrates and buffers the pH in a range of 8.5–10 associated with the minimum solubility of various divalent metals.
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REFRACTORIES TRENDS IN RESEARCH AND APPLICATIONS
Oxidation kinetics of magnesia-carbon refractory H. Sunayama M. Kawahara 15 Direct observation of interfacial phenomena such as local corrosion slag and metal penetration into refractories using a high temperature X-ray radiographic technique K. Mukai T Matsushita Z. Li 23 Applying a computer modeling predicting MgO saturated slag chemistry
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Global Advances in Refractories Second edition The German
Required Properties of Organic Compounds in Refractory 380 Products from the Viewpoint of the Refractory Producer S. Altpeter-Lechner G. Kontrus Structure and Oxidation Resistance of Bonding Carbon 383 Based on Resin and Pitch L. Nan Z Boquan Oxidation Kinetics of Graphite in Basic Refractory 383 Compositions M Rigaud C. Richmond P
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The effect of antioxidants on the oxidation behaviour of
Oxidation of carbon is the main problem in magnesia–carbon refractories. The effects of various antioxidants Al Si SiC and B4C on the oxidation resistance of magnesia–carbon bricks were investigated at temperatures of 1300 °C and 1500 °C. Carbon losses as wt. of the bricks were calculated and oxidized areas of the bricks were examined by XRD SEM and EDS.
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Effects of Antioxidants Particle Size on Oxidation
In this study Si and SiC powder with a critical particle size ranged from 0.1 to 0.4mm was added into MgO-C refractory as antioxidants. At 1200°C in air atmosphere oxidation weight losses of cylindrical specimens with additives were measured and the effective diffusion coefficient of oxygen in refractories was calculated from the results.
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All articlesJournal of Ceramic Science
Effect of Submicron-Carbon-Containing MgO-C Refractories on Carbon Pickup of Ultra-Low Carbon Steel. Y. Liu 1 2 L. Wang 2 G. Li 1 2 3 Z. Zhang 2 X. Xu 1 Y. Li 1 J. Chen 1. 1 The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China 2 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education
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Effect of Si Antioxidant on the Oxidation Behavior of Mgo
converted to shrinking core by raising temprature. At lower tempratures chemical absorption of oxygen in oxidation process on graphite sheets and solid diffusion are prevailing mechanism. By increasing temprature to 1100 C and addition of 5 silicon chemical absorption step will be omitted. Keywords MgO-C Refractory Antioxidant Silicon
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The effect of antioxidants on the oxidation behaviour of
Mar 01 2008 · Oxidation of carbon is the main problem in magnesia–carbon refractories. The effects of various antioxidants Al Si SiC and B 4 C on the oxidation resistance of magnesia–carbon bricks were investigated at temperatures of 1300 °C and 1500 °C. Carbon losses as wt. of the bricks were calculated and oxidized areas of the bricks were examined by XRD SEM and EDS.
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Mohammad Sani University of TehranAcademia.edu
Kinetics of oxidation and disappearance of graphite in MgO–C refractory bricks have been investigated in the temperature range from 1000 to 1200 °C where graphite is mainly consumed by gaseous oxygen in air. A mathematical model including kinetic parameters has been proposed to explain the extent of oxidation with time.
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(PDF) Low Carbon MgO-C Refractories for Clean Steel Making
HMOR (1400°C/30 min) 31 51 58 (Kg/cm2) Table 1 Chemical composition ( ) and basicity of Spalling cycles 15 18 18 the slag chemistry of ladle slag (1400°C to Air) Oxidation resistance at CaO SiO2 Al2O3 MgO Fe2O3 1400°C/3 hrsBlack 41.3 44.2 49.8 CaO/SiO2 = 6.02 surface remaining ( ) 54.34 9.02 30.84 3.50 0.99 CaO/Al2O3=1.76 Induction slag
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Global Advances in Refractories Second edition The German
Required Properties of Organic Compounds in Refractory 380 Products from the Viewpoint of the Refractory Producer S. Altpeter-Lechner G. Kontrus Structure and Oxidation Resistance of Bonding Carbon 383 Based on Resin and Pitch L. Nan Z Boquan Oxidation Kinetics of Graphite in Basic Refractory 383 Compositions M Rigaud C. Richmond P
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steel research international Vol 92 No 4
PDF Request permissions Masthead. Free Access. free with FeO–rich slag and the degree of corrosion of the refractory increases with the FeO content. Due to the oxidation of carbon in the MgO–C refractory the wettability between the refractory and the molten slag decreases which leads to a penetration of slag and aggravates the
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Corrosion Behavior of MgO–C Refractory in
cantly damaged. The change in the appearance of the MgO– C refractory specimen immersed in CaO–SiO 2 slag is shown in Fig. 2. It can be seen that changes in appearance and weight are not significant. Horizontal cross-section of react-ed MgO–C refractory cut at 1 cm from the bottom was observed using an optical microscope (Fig. 3(a)). The
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International Colloquium on Refractories 44 (Aachen
Cartoncontaining refractories Technological and environmental comparison of differentcarbon-bindersfor MgO-Crefractories 50 Borzov Dmitry Ulbricht JoachimSchulle Wolfgang Oxidationkinetics of magnesia-carbonrefractories SunayamaHiroyuki Kawahara Masayasu TheEffectofB4Caddition ontheoxidation resistance of MAC AMC ACand MCrefractories Altun A. Therolesofmetal fiberin Al203-C
Get PriceOxidation kinetics of MgO–C refractory bricksScienceDirect
Jan 01 2002 · Kinetics of oxidation and disappearance of graphite in MgO–C refractory bricks have been investigated in the temperature range from 1000 to 1200 °C where graphite is mainly consumed by gaseous oxygen in air. A mathematical model including kinetic parameters has been proposed to explain the extent of oxidation with time.
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A Comprehensive Review of Recent Advances in Magnesia
It addresses the oxidation kinetics of magnesia carbon refractory bricks the microstructure of graphite and nano carbon-containing MgO-C refractories determination of the mineralogical composition of MgO-C refractories by the Rietvelt method and the mechanical behaviour of these refractories.
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Global Advances in Refractories Second edition The German
Required Properties of Organic Compounds in Refractory 380 Products from the Viewpoint of the Refractory Producer S. Altpeter-Lechner G. Kontrus Structure and Oxidation Resistance of Bonding Carbon 383 Based on Resin and Pitch L. Nan Z Boquan Oxidation Kinetics of Graphite in Basic Refractory 383 Compositions M Rigaud C. Richmond P
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Oxidation behaviors of MgO-C refractories with different
Dec 01 2019 · A mathematical model was developed to explain oxidation mechanism of C in MgO-C refractory bricks without antioxidant additive. Similarly Faghihi-Sani and Yamaguchi 31 detected the isothermal oxidation kinetics of MgO-C without antioxidant additive in the temperature range from 1000 °C to 1200 °C.
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Corrosion mechanism and kinetic behaviour of refractory
The rate of dissolution of solid MgO-C and doloma into liquid in CaO-Al 2O 3-SiO 2-MgO slag at different temperatures was studied under conditions of forced convection by rotating cylindrical refractory specimens in a stationary crucible containing the molten slag. The corrosion rate was calculated from the change in diameter of the cylindrical
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PROCEEDINGS OF THE SECOND INTERNATIONAL
Effect of Particle Composition of Magnesite on Fracture Properties of MgO-C Brick 572 Wang Runze and Liu Yanling Luoyang Institute of Refractories Research China Reaction Kinetics in the MgO-C Refractory Materials at High Temperature 580 Under Vacuum Jiang Mingxue Xi an Institute of Metallurgy and Construction Engineering China
Get PriceThe effect of antioxidants on the oxidation behaviour of
Oxidation of carbon is the main problem in magnesia–carbon refractories. The effects of various antioxidants Al Si SiC and B4C on the oxidation resistance of magnesia–carbon bricks were investigated at temperatures of 1300 °C and 1500 °C. Carbon losses as wt. of the bricks were calculated and oxidized areas of the bricks were examined by XRD SEM and EDS.
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Kinetics and Thermodynamics of Carbon Isothermal and Non
The presence of carbon makes these bricks very susceptible to oxidation leading to a reduction of the strength and to the penetration of metal and/or slag. The aim of this paper is to investigate the processes of carbon oxidation of MgO-C commercial bricks containing 7 and 14 pct C by both isothermal and non-isothermal methods.
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A Comprehensive Review of Recent Advances in Magnesia
It addresses the oxidation kinetics of magnesia carbon refractory bricks the microstructure of graphite and nano carbon-containing MgO-C refractories determination of the mineralogical composition of MgO-C refractories by the Rietvelt method and the mechanical behaviour of these refractories.
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Corrosion mechanism and kinetic behaviour of MgO–C
Oct 17 2005 · The rate of dissolution of solid MgO–C into liquid CaO–Al 2 O 3 –SiO 2 –MgO slag at different temperatures was studied under conditions of forced convection by rotating cylindrical refractory specimens in a stationary crucible containing molten slag. The corrosion rate was calculated from the change in diameter of the cylindrical refractory specimens.
Get PriceEFFECT OF Si ANTIOXIDANT ON THE RATE OF OXIDATION OF
Kinetics of air-oxidation MgO–C–Al refractory at 600–1300°C has been investigated by Sadrnezhaad et al 2 . Addition of aluminum antioxidant indicated a reducing effect on oxidation of MgO–C bricks at 800 7 1250°C. Reverse behavior has been observed at T 700°C. Further studies have been carried out on the oxidation kinetics of MgO-C
Get PriceEffect of Al Antioxidant on the Rate of Oxidation of
Jan 26 2007 · Kinetics of air oxidation of MgO–C–Al refractory at 600°–1300°C were investigated using the software based on the modified shrinking core model (KDA). Commercial bricks containing 88.5 MgO 10 residual carbon and 1.5 aluminum anti‐oxidant were oxidized isothermally with air.
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EPA1Magnesia-carbon refractoryGoogle Patents
The unburnt refractory comprises fine magnesia as a main constituent and significantly differs from prior art refractories in that the maximum grain diameter of the fine magnesia is 1.5 mm and in that magnesia having a grain diameter of 0.3 to 1.5 mm comprises at most 30 by weight of the refractory raw materials. By so limiting the particle size a refractory having high compactness is
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Effect of Al Antioxidant on the Rate of Oxidation of
Jan 26 2007 · Kinetics of air oxidation of MgO–C–Al refractory at 600°–1300°C were investigated using the software based on the modified shrinking core model (KDA). Commercial bricks containing 88.5 MgO 10 residual carbon and 1.5 aluminum anti‐oxidant were oxidized isothermally with air.
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MagnesiaMagnesium Oxide (MgO) Properties Applications
Feb 06 2001 · Crucibles with stability of 2400 o C in air 1700 o C in reducing atmospheres 1600 o C in vacuum and 1400 o C in hydrogen have been reported in the literature. Cements. Magnesia (or Sorel) cement is a refractory binder based on a magnesium oxychloride formulation. It is fast-hardening and has a number of refractory and general repair applications.
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