corrosion of al2o3 cr2o3 refractory lining for high
Effect of Cr2O3 addition on corrosion mechanism of
· 1. Introduction. Al 2 O 3-Cr 2 O 3 refractory bricks are used as highly corrosion resistance lining of the various high temperature furnaces such as waste incinerators gasifiers fiber glass furnaces etc. .Extremely low solubility of Cr 2 O 3 into molten slags/glass is responsible for these corrosion resistance properties .Moreover addition of CaO to Al 2 O 3-Cr 2 O 3 unfolds its
Get Price
A new ternary phase in the system CaO–Al2O3–Cr2O3
High‐temperature ceramics containing Al 2O 3‐Cr 2O 3 are used extensively as lining materials in Cu‐smelting waste incinerators and gasifiers because of their corrosion and spalling resistance due to the low solubility of Cr in the resultant slags.1‒3 However trivalent chromium (Cr(III)) can be oxidized to hexavalent chromium (Cr(VI
Get Price
Corrosion of Al2O3–Cr2O3 refractory lining for high
· Al2O3–Cr2O3 brick possesses high resistance to chemical corrosion at high temperatures due to low solubility in molten slags and salts . This system is well-known for application in numerous fields׳ viz. fiber glass furnaces coal gasifiers carbon black reactors incinerators and different solid waste vitrification processes as a corrosion resistance refractory 3 4 5 6 7 8 9 .
Get Price
A Certain Amount of Cr2O3 Can Enhance the Corrosion
· Therefore adding Cr2O3 to AL2O3-SiO2 refractory materials especially high-aluminum materials will not reduce its refractoriness but will also improve. The introduction of Cr2O3 in the AL2O3-SiO2 system can effectively improve the slag resistance because the improvement of the creep resistance of the brick body can improve the slag resistance.
Get Price
Hot corrosion behavior of Al2O3–Cr2O3 refractory by molten
· The high corrosion resistance of Al 2 O 3 –Cr 2 O 3 refractories is due to the extremely low solubility of Cr 2 O 3 in molten glass/salt/slag. Addition of Cr 2 O 3 to alumina improves the corrosion resistance against various molten slag and salt systems 30 31 32 .
Get Price
Dynamic Testing of Gasifier Refractory
· The refractory lining is an integral part in the majority of entrained-flow gasifiers. The corrosion and high temperature. The main components of refractories are chromium oxides and alumina with additives such as titania zirconia and Cr2O3–Al2O3–ZrO2 and Cr2O3–MgO compositions could withstand gasifier environments
Get Price
Properties And Application Of Chrome CorundumNews
· Cr2O3 is a high quality component of refractories which can form high melting point compounds with a variety of oxides. In the refractory used for the lining of MSWI (ash furnace) the refractory containing chromium oxide generally shows good corrosion resistance In general the corrosion rate of al2o3-cr2o3 increases with the increase
Get Price
Effect of Cr2O3 addition on corrosion mechanism of
· Al 2 O 3 -Cr 2 O 3 refractory bricks are used as highly corrosion resistance lining of the various high temperature furnaces such as waste incinerators gasifiers fiber glass furnaces etc. . Extremely low solubility of Cr 2 O 3 into molten slags/glass is responsible for these corrosion
Get Price
Corrosion behavior of Al2O3 substrate by
· However few studies have been carried out to investigate the corrosion behavior of refractory lining by the slag from smelting nickel laterite ore. In order to simulate the RHF process in this study the wetting and corrosion behaviors of SiO 2 –MgO–FeO–CaO–Al 2 O 3 quinary slag on Al 2 O 3 substrate were investigated by the sessile
Get Price
Coatings Free Full-Text Effects of Cr2O3 Content on
Al2O3-Cr2O3 refractories are completely substitution solid solutions and can effectively resist slag erosion when used as an industrial furnace lining. In order to provide suitable chromium corundum refractory with excellent slag resistance and mechanical properties for smelting reduction ironmaking Al2O3-Cr2O3 samples with different mass percentages (0 10 20 30 40 wt. ) of Cr2O3 were
Get Price
An analysis of the causes of failure in high chrome oxide
· Abstract. High Cr2O3 refractory materials are used to line the hot face of slagging gasifiers. Gasifiers are reaction chambers that convert water oxygen and a carbon feedstock into CO H2 and methane at temperatures as high as 1575DGC and pressures up to 1000 psi.
Get Price
Alumina Chrome BrickRS Kiln Refractory Bricks
Alumina Chrome Brick Description Alumina chrome bricks main ingredients are corundum and chromic oxide featured by low impurity content stable high-temperature chemical property high refractoriness high strength high hardness and so on. When corundum content is higher than 92 it is called corundum chrome brick. Al2O3 and Cr2O3 can form high melting point compounds or
Get Price
Corrosion behavior of Al2O3 substrate by
· As the slag melted it would wet on the lining and even corrode the refractory. Alumina–based refractory is widely used as lining material due to its good corrosion and dissolution resistance. The corrosion behavior of high–alumina refractories has been intensively investigated .
Get Price
Refractory Corrosion Resistance in Molten Lead-Niobium
It is shown that chromium-containing refractories containing more than 80 Cr2O3 are most corrosion-resistant in molten lead-niobium glass at 1440°C. Alongside good corrosion resistance fusion-cast high-chromium refractories are capable of providing prescribed glass electrophysical properties obtained on contact with chromium refractory. The data provided point to the possibility of
Get Price
Alumina Chrome BrickRS Kiln Refractory Bricks
Alumina Chrome Brick Description Alumina chrome bricks main ingredients are corundum and chromic oxide featured by low impurity content stable high-temperature chemical property high refractoriness high strength high hardness and so on. When corundum content is higher than 92 it is called corundum chrome brick. Al2O3 and Cr2O3 can form high melting point compounds or
Get Price
Interaction of High Al2O3 Refractories with Alkaline Salts
In this work the attack of alkali salts to high alumina refractories was studied. The refractory was exposed to four pure salts (K2CO3 K2SO4 Na2CO3 and Na2SO4) and one synthetic ash (K2CO3-KCl). The refractory was exposed to the salts at 700 800 and 900 degrees C for 168 h.
Get Price
A REVIEW ON ALUMINACHROME (AL2O3CR2O3)
· Symposium on Refractories Nov. 1988 Hangzhou China have stressed on the important properties like high corrosion and thermal shock resistance properties of Alumina-Chrome or Al-Chrome bonded refractories. The vulnerable areas of glass melting furnace (e.g. overcoating refractory blocks at the metal line throat
Get Price
Corrosion mechanism of Cr2O3-Al2O3-ZrO2 refractories in a
· Corrosion behavior of (Cr Al) 2 O 3 solid solution aggregate. Because high purity Cr 2 O 3 possesses strong volatility it is very difficult to form "direct" bonding between Cr 2 O 3 aggregates and Cr 2 O 3 fines in the matrix. For this reason high purity Cr 2 O 3 refractory
Get Price
Refractory Corrosion Resistance in Molten Lead-Niobium
It is shown that chromium-containing refractories containing more than 80 Cr2O3 are most corrosion-resistant in molten lead-niobium glass at 1440°C. Alongside good corrosion resistance fusion-cast high-chromium refractories are capable of providing prescribed glass electrophysical properties obtained on contact with chromium refractory. The data provided point to the possibility of
Get Price
How Can We Improve the Corrosion Resistance and Wear
· Analyzed from the corrosion depth the high-aluminum castable with chromium oxide has good corrosion resistance. This product has a wide range of applications low cost and strong corrosion resistance. It is called aluminum-chromium high-aluminum castable in the refractory industry.
Get Price
Refractory liner materials used in slagging gasifiers
· These liner materials are made of high Cr2O3 and lower levels of Al2O3 and/or ZrO2. As a working face lining in the gasifier refractories are exposed to molten slags at elevated temperature that originate from ash in the carbon feedstock including coal and/or petroleum coke. The molten slag causes refractory failure by corrosion dissolution
Get Price
Papersrefractories-worldforum
· Corrosion Behaviour of Refractory Materials in the Systems Cr2O3 and Cr2O3Al2O3 against Glass Melts in Subject to their Composition and the Thermal Conditions M. Freund Volume 2 Issue 3 Pages 9396
Get Price
Effect of Cr2O3 addition on corrosion mechanism of
· 1. Introduction. Al 2 O 3-Cr 2 O 3 refractory bricks are used as highly corrosion resistance lining of the various high temperature furnaces such as waste incinerators gasifiers fiber glass furnaces etc. .Extremely low solubility of Cr 2 O 3 into molten slags/glass is responsible for these corrosion resistance properties .Moreover addition of CaO to Al 2 O 3-Cr 2 O 3 unfolds its
Get PriceDegradation mechanism of Cr2O3‐Al2O3‐ZrO2
· Durability and corrosion behavior of refractory lining a core part of a commercial water‐coal slurry gasifier largely determine its gas yield rate and carbon conversion rate. In this work corrosion behavior of high chromite‐containing refractory served for 4200 hours in a water‐coal slurry gasifier was studied and the role of generated stress cracks on its degradation behavior was
Get PriceChrome Alumina DVC LiningHigh Performance
· Within this framework the use of highgrade chrome- -alumina dry refractories provides an interesting alternative to NRMbased on spinel bonding . Chrome-alumina materials have been successfully used for decades in various steelmaking operations due to their high refractoriness and excellent corrosion resistance in various environments.
Get Price
Degradation mechanism of Cr2O3‐Al2O3‐ZrO2 refractories
· Durability and corrosion behavior of refractory lining a core part of a commercial water-coal slurry gasifier largely determine its gas yield rate and carbon conversion rate. In this work corrosion behavior of high chromite-containing refractory served for 4200 hours in a water-coal slurry gasifier was studied and the role of generated
Get Price
Papersrefractories-worldforum
· Keywords corrosion Cr2O3 refractories Cr3O3-Al2O3 refractories. Abstract References Full Article Corrosion Mechanisms of Refractory Materials Used in Secondary Metallurgy. Harald Harmuth Franz Melcher. Volume 3 Issue 1 Pages 99104
Get Price
Paperrefractories-worldforum
· It concerns here short glasses with high ferric oxide content. In order to melt these fibre glasses special refractories based on chromium oxide (mineral name eskolaite) for the glass tank s lining are needed. So the aim of this paper is to give a review over refractories of the system Cr2O3–Al2O3 with chromium oxide content from 15 up to
Get Price
An analysis of the causes of failure in high chrome oxide
· Abstract. High Cr2O3 refractory materials are used to line the hot face of slagging gasifiers. Gasifiers are reaction chambers that convert water oxygen and a carbon feedstock into CO H2 and methane at temperatures as high as 1575DGC and pressures up to 1000 psi.
Get Price
