Drying StagesPandolfelli Refractory Evaporation
· Drying StagesPandolfelliFree download as PDF File (.pdf) Text File (.txt) or read online for free. Drying Stages during the Heating of High-Alumina Ultra-Low-Cement Refractory Castables. Murilo D. M. Innocentini Fa´bio A. Cardoso Mario M. Akyioshi and Victor C. Pandolfelli The purpose of this work was to investigate the drying kinetics of high-alumina ultra-low-cement refractory
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drying stages during the heating of high alumina
Current Location > Home > drying stages during the heating of high alumina. drying stages during the heating of high alumina. How to Preserve Food by DryingPartSelect. The best temperature to dry foods and preserve them is 140 deg F. However for meats and poultry the USDA Meat and Poultry Hotline recommends heating meat to 160 deg F and poultry
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Drying of Organic Solvents Quantitative Evaluation of the
· was reasonably good as a desiccant neutral alumina was much better rivaling the ultimate efficiency of molecular sieves after a single pass of the THF over a column of the activated alumina. For rapid drying neutral alumina is the drying agent of choice followed by storage over 3 A˚ molec-ular sieves if storage is necessary.
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Porogenic Behavior of Water in High-Alumina Castable
· Direct casting is a processing method that can produce large parts of complex geometry. It uses dispersions of ceramic particles in water and a hydraulic binder for consolidation. Studies on castable structures have reported the generation of a significant fraction of pores due to the presence of water. This effect occurs because drying preserves part of the interparticle pores originally
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(PDF) The drying behavior of high-alumina ULC refractory
When the permeability of the body is sufficiently high or the heating rate is low no significant pressure build-up is developed during the heat-up and the water loss can be considered mainly influenced by the rate of water converted to steam by boiling.The cause of the third drying stage related to the small peak in the derivative curves is not yet clear but one hypothesis is that the steam flow exiting the body during the second stage
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Alumina Ceramic What is it How Is It Made Products
· Properties of Alumina High Temperature Ability. Alumina is used in oxidizing and reducing atmospheres up to 1650°C or 2900°F as well as vacuum environments of 2000°C or 3600°F. At 1000° C it keeps 50 of the tensile strength it has at room temperature.
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Drying behavior of hydratable alumina-bonded refractory
· Drying behavior of green castables bonded with CAC and HAB subjected to continuous heating (a) Rate of 10 °C/min from room temperature up to 800 °C. Curves (iii) and (iv) refer to moisture free (MF) samples. (b) A more aggressive heating rate (20 °C/min) was applied to evaluate the explosive spalling occurrence.
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drying stages during the heating of high alumina
Current Location > Home > drying stages during the heating of high alumina. drying stages during the heating of high alumina. How to Preserve Food by DryingPartSelect. The best temperature to dry foods and preserve them is 140 deg F. However for meats and poultry the USDA Meat and Poultry Hotline recommends heating meat to 160 deg F and poultry
Get Price
(PDF) WATER CONTENT AND ITS EFFECT ON THE DRYING
The drying behavior of high-alumina ULC refractory castables under different heating rates. By Murilo D M Innocentini. Drying Stages during the Heating of High-Alumina Ultra-Low-Cement Refractory Castables. By Fábio Cardoso. Key Properties for the Optimization of Refractory Castable Drying.
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(PDF) Drying behavior of hydratable alumina-bonded
Additionally the water losses occurring after the second main peak relate to the final stages of binding phase dehydration as evidenced by the very similar dewatering behavior of as-cured and moisture-free samples within the temperature ranges of C for CAC and C for HAB.
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Microstructure and physical characterization of alumina
· Drying and sintering of alumina ceramic pellets. After fabrication process the semidry compact Al 2 O 3 ceramic pellets with different particle sizes were dried for 24 h at room temperature in order to remove free moisture from the sample. Basically drying is the most important stage before the firing is carried out.
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The Drying Curve Part 1 Process Heating
· During the second phase or constant rate period free moisture persists on the surfaces and the rate of evaporation alters very little as the moisture content reduces. During this period drying rates are high and higher inlet air temperatures than in subsequent drying stages can be used without detrimental effect to the product.
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Porogenic Behavior of Water in High-Alumina Castable
· Direct casting is a processing method that can produce large parts of complex geometry. It uses dispersions of ceramic particles in water and a hydraulic binder for consolidation. Studies on castable structures have reported the generation of a significant fraction of pores due to the presence of water. This effect occurs because drying preserves part of the interparticle pores originally
Get Price
(PDF) Drying Stages during the Heating of High-Alumina
The purpose of this work was to investigate the drying kinetics of high-alumina ultra-low-cement refractory castables under continuous heating conditions. Three main drying stages were identified during the castable heat-up and were related to the
Get PriceThe Drying Curve Part 1 Process Heating
· During the second phase or constant rate period free moisture persists on the surfaces and the rate of evaporation alters very little as the moisture content reduces. During this period drying rates are high and higher inlet air temperatures than in subsequent drying stages can be used without detrimental effect to the product.
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Microwave Drying Effects on the Properties of Alumina
· The application of microwave heating in drying process of alumina-zeolite foams has high potential to improve the foams characteristics. Due to the high frequency and short wavelength of microwave radiation there are several advantages to microwave drying such as more uniform drying and greater energy efficiency.
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Novel drying additives and their evaluation for self
Abstract The drying step of dense refractory castables containing hydraulic binders is a critical process which usually requires using slow heating rates due to the high explosion trend of such materials during their first thermal treatment. Thus this work investigated the performance of alternative additives to induce faster and safer drying of self-flowing high-alumina refractory castables
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4. EXISTING WAGERUP REFINERY 4.1 ALUMINA REFINING
· Calcination involves washing and drying the alumina hydrate (Al2O3.3H2O) then heating it to about 1 000 °C to drive off chemically combined water. The final product is alumina (Al2O3) a dry pure white sand-like material which is the feedstock for aluminium smelters.
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· Designing and processing crack-free high-alumina MgO-bonded castables are huge challenges for refractory producers as not only cracks and flaws can be generated during the curing step of the prepared samples (due to brucite formation and its non-accommodation in the microstructure) but also the first heating treatment of such materials may lead to their spalling or explosion as a consequence of a combination of low permeability and high
Get PriceCalcium aluminate cement source evaluation for Al2O3–MgO
· Drying stages during the heating of high-alumina ultra-low cement refractory castables Journal of the American Ceramic Society 86 ( 7 ) ( 2003 ) pp. CrossRef View Record in Scopus Google Scholar
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Microstructure and physical characterization of alumina
· Drying and sintering of alumina ceramic pellets. After fabrication process the semidry compact Al 2 O 3 ceramic pellets with different particle sizes were dried for 24 h at room temperature in order to remove free moisture from the sample. Basically drying is the most important stage before the firing is carried out.
Get Price
Novel drying additives and their evaluation for self
Abstract The drying step of dense refractory castables containing hydraulic binders is a critical process which usually requires using slow heating rates due to the high explosion trend of such materials during their first thermal treatment. Thus this work investigated the performance of alternative additives to induce faster and safer drying of self-flowing high-alumina refractory castables
Get PriceCement ChemistryThe Concrete Portal
· Drying of this water is responsible for a lot of shrinkage. Interlayer water Water held in between layers of C-S-H. The absence of CH in the hydration product and conversion of all aluminous compounds into ettringite during the initial stages makes this cement highly resistant to sulphate attack. (or High Alumina cement) This cement
Get PriceDrying Stages during the Heating of High
· Three main drying stages were identified during the castable heat-up and were related to the phase change of free water and to the decomposition of hydrated products present in the body. A clear correlation was found between the actual heating profile inside the castable and the dewatering stages under various heating schedules.
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Microstructure and physical characterization of alumina
· Drying and sintering of alumina ceramic pellets. After fabrication process the semidry compact Al 2 O 3 ceramic pellets with different particle sizes were dried for 24 h at room temperature in order to remove free moisture from the sample. Basically drying is the most important stage before the firing is carried out.
Get Price
Microwave Drying Effects on the Properties of Alumina
· The application of microwave heating in drying process of alumina-zeolite foams has high potential to improve the foams characteristics. Due to the high frequency and short wavelength of microwave radiation there are several advantages to microwave drying such as more uniform drying and greater energy efficiency.
Get PriceAlumina-bound high strength ceramic honeycombs
Strong high-surface-area honeycombs of alumina or other ceramic composition are provided by compounding and shaping a moldable ceramic powder extrusion batches including a cellulosic temporary binder and a high-surface-area boehmite precursor for a permanent binder hydrating the shaped honeycomb to develop a boehmite binding phase and calcining the hydrated body to develop the
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Drying of Organic Solvents Quantitative Evaluation of the
· was reasonably good as a desiccant neutral alumina was much better rivaling the ultimate efficiency of molecular sieves after a single pass of the THF over a column of the activated alumina. For rapid drying neutral alumina is the drying agent of choice followed by storage over 3 A˚ molec-ular sieves if storage is necessary.
Get Price
The Drying Curve Part 1 Process Heating
· During the second phase or constant rate period free moisture persists on the surfaces and the rate of evaporation alters very little as the moisture content reduces. During this period drying rates are high and higher inlet air temperatures than in subsequent drying stages can be used without detrimental effect to the product.
Get Price
