The influence of the curing temperature on the explosion
The influence of the curing temperature on the explosion tendency of high-alumina ultra-low cement refractory castables da estrutura durante a secagem.One of the main limiting factors in the processing of refractory castables is the long drying schedule required since high heating rates can cause mechanical damage or even the explosion of
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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.
Get PriceSpray Freeze Granulation of Submicrometre -Alumina
with those of alumina bodies prepared using similar suspension by the slip-casting route. Keywords Alumina granulation spray-freeze drying two-stage sintering I. Introduction With its combination of high hardness corrosion re-sistance thermodynamic stability and relatively low cost compared to other advanced ceramics alumina is a mate-
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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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11.5 Refractory Manufacturing
· (chromite-magnesite) magnesia-chrome and chrome-alumina. Chromium compounds are emitted from the ore crushing grinding material drying and storage and brick firing and finishing processes used in producing these types of refractories. Tables 11.5
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Process for the production of aluminum hydroxide of
· Aluminium hydroxide of high whiteness is produced by (i) heating aluminium hydroxide obtained from the Bayer process to a temperature of 300 to 700° C. (ii) dissolving the soluble fraction of the thus obtained activated product at 85 to 275° C. in aqueous sodium hydroxide to form a sodium aluminate liquor containing an undissolved residue of very fine boehmite (iii) filtering said sodium
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MANUFACTURING OF NANOPARTICLE-FILLED PA11
· 15 min using a rotor-stator mixer (Ultra Turrax T18 IKA). The autoclaves were then heated to 190 °C where the system was held for 15 min to ensure complete dissolution of the PA11 before heating was turned off. The system was then cooled to 130 °C where an isothermal step was applied for 30 min. Stirring inside the
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Ceramics Sintering and Microstructure
· During this stage the microstructure of the samples evolves (see Figure 1). An example is spark plasma sintering (SPS) where very high heating and cooling rates are achieved with the help of a pulsed electric field which leads to a high density in a relatively (e.g. 3987 g/cm3 for alpha alumina) and on the closed pore volume (Vf)
Get PriceHigh temperature neutron diffraction study of the Al O
· Journal of the European Ceramic Society 26 (2006) 3515–3524 High temperature neutron diffraction study of the Al 2O 3–Y 2O 3 system M. Medraja ∗ R. Hammondb M.A. Parveza R.A.L. Drewc W.T. Thompsond a Concordia University Montreal Que. Canada H3G 1M8 b NPMR NRC Chalk River Canada c McGill University Montreal Canada d Royal Military College Kingston Canada
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Process for the production of aluminum hydroxide of
· Aluminium hydroxide of high whiteness is produced by (i) heating aluminium hydroxide obtained from the Bayer process to a temperature of 300 to 700° C. (ii) dissolving the soluble fraction of the thus obtained activated product at 85 to 275° C. in aqueous sodium hydroxide to form a sodium aluminate liquor containing an undissolved residue of very fine boehmite (iii) filtering said sodium
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Raman spectroscopy of V O MOO Fe203 Mo03-V205
· was recorded. Ultra-high-purity hydrocarbon-free oxygen (Linde Gas) was purged through the cell during the experiment. The acquisition time used per scan was 30 s and 25 scans were averaged. The 514.5 nm line of an argon ion laser (Spectra
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Drying and Firing Process << Bill Rowe s Pottery Page
· DRYING/FIRING PROCESS 1. Drying. As plastic clay dries it shrinks 5 . Very plastic clay shrinks 8 as it dries. Shrinkage is slow and can create problems. The average plastic clay is 35 parts water to 100 parts clay. (a mass of clay is 25 water) As humidity falls (in the atmosphere) below 100 drying takes place.
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Reasons for crack propagation and strength loss in
· these castables to a high level of apparent porosity after 1 day of drying at 110°C (Figure 1). 2.1.2. Colloidal binder The disadvantages of CaO in cement at high tempera-tures have led many researchers to consider replacing Table 1. Phases of high alumina castable production at different temperatures 14 . Temperature °C Tabular alumina
Get PriceEffect of Curing Conditions on the Shrinkage of Ultra High
· The effect of curing conditions on the early age and long-term shrinkage of ultra high-performance fiber-reinforced concrete (UHPFRC) was systematically studied. The shrinkage of the early age (0–168 h) and long-term age (0–90 d) of UHPFRC material was measured based on three kinds of humidity conditions (dry sealed and soaked) and curing temperatures (25 #xb0C 40 #xb0C and
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Drying Stages during the Heating of High-Alumina Ultra
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
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Drying and Firing Process << Bill Rowe s Pottery Page
· DRYING/FIRING PROCESS 1. Drying. As plastic clay dries it shrinks 5 . Very plastic clay shrinks 8 as it dries. Shrinkage is slow and can create problems. The average plastic clay is 35 parts water to 100 parts clay. (a mass of clay is 25 water) As humidity falls (in the atmosphere) below 100 drying takes place.
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pdf drying stages during the heating of high aluminahigh
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 phase change of free water and to the decomposition of hydrated products present in the body.
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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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Spray Freeze Granulation of Submicrometre -Alumina
with those of alumina bodies prepared using similar suspension by the slip-casting route. Keywords Alumina granulation spray-freeze drying two-stage sintering I. Introduction With its combination of high hardness corrosion re-sistance thermodynamic stability and relatively low cost compared to other advanced ceramics alumina is a mate-
Get PriceAlumina 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 and Firing Process << Bill Rowe s Pottery Page
· DRYING/FIRING PROCESS 1. Drying. As plastic clay dries it shrinks 5 . Very plastic clay shrinks 8 as it dries. Shrinkage is slow and can create problems. The average plastic clay is 35 parts water to 100 parts clay. (a mass of clay is 25 water) As humidity falls (in the atmosphere) below 100 drying takes place.
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Preparation of porous alumina ceramic with ultra-high
· The ultra-high porosity of 82 could be achieved when the solid loading was 10 vol . Moreover the density of the porous alumina ceramic with the porosity of 82 was even lower than water s. The compressive strength of the porous alumina ceramic with the porosity of 63 and 82 was determined to be 37.0 and 2.6 MPa respectively.
Get PriceThe influence of the curing temperature on the explosion
The influence of the curing temperature on the explosion tendency of high-alumina ultra-low cement refractory castables da estrutura durante a secagem.One of the main limiting factors in the processing of refractory castables is the long drying schedule required since high heating rates can cause mechanical damage or even the explosion of
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Denaturation aggregation and heat stability of milk
Singh H. Fox P. F. 1985 Heat stability of milk pH-dependent dissociation of micellar κ-casein on heating milk at ultra high temperatures. Journal of Dairy Research 52
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Drying 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.
Get PricePhase Transition Behavior of Nanocrystalline Al2O3
· high thermal gradient and rapid cooling rate. Because of the gas evolution large particles or agglomerates can be disintegrated during the process and the products formed are of high purity. The resulting product is very fine par-ticulates of friable agglomerates that can be easily ground to obtain a much finer particle size.
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Drying Stages during the Heating of High‐Alumina Ultra
· 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 phase change of free water and to the decomposition of hydrated products present in the body. A clear correlation was found between the
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UNDERSTANDING THE EFFECTS OF DRYING METHODS ON
Jiang J Lu J and Yan H (2008). Dynamic viscoelastic properties of wood treated by three drying methods measured at high-temperature range. Wood Fiber Sci. 40(1) 72-79. Kanagawa Y Hayashi K Yasujima M (1993) Change of dry ability under vacuum drying by improvement of permeability of wood. Vacuum Drying of Wood 93. High Tatras Slovakia. 292 pp.
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Setting Time of Cement ConcreteStages and Processes
Stages of Setting of Cement The setting process of cement starts as it is mixed with water. The chemical phenomenon that takes place are divided into 3 stages 1. Hydrolysis and Hydration Stage The process of setting starts after the addition of water. In this process the four compounds of cement (C 3 S C 2 S 3CA1 4CAFe) get hydrated.
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