the effect of additives on the properties of highlow cement high alumina castables effect of distribution
Effect of Micro-Sized Alumina Powder on the Hydration
Micro-sized alumina powder is widely used in low cement high-alumina refractory castables. The hydration of calcium aluminate cement can be affected by adding micro-sized alumina powder. This work addresses the hydration of a commercial cement at 25°C with 50 wt micro-sized alumina powder added. The hydration heat was measured by isothermal micro-calorimetry.
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THE EFFECT OF ADDITIVES ON THE PROPERTIES OF HIGH
· It has been shown that the dispersant type and addition level has a significant effect on castable flow water demand and strength of the high alumina low-cement self-flowing castables. Also the length and shape of deflocculant molecule have a great effect on its dispersion mechanism. Among the dispersants investigated polycarboxylateether (FS-20) is the most effective in increasing self-flow ability in this system its optimum addition amount is 0.06 wt. . Polycar-boxylateether (FS-20) at a low level of 0.06 addition and 4.5 percent water consumed generally produced very high flow and sufficient workability over time. Therefore Polycarboxylateether (FS-20) proved to be the most effective
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(PDF) The effect of deflocculants on the self-flow
The effect of deflocculants on the self-flow characteristics of ultra low-cement castables in Al2O3–SiC–C system. Ceramics International 2005. Mohammad Bahrevar. Sasan Otroj. Mohammad Nilforoshan. Mohammad Bahrevar.
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Effect of grinding on the hydration of hydratable alumina
· Hydratable alumina (HA) is a superior Ca-free refractory binder but the quick hydration rate restricts the working time of castables bonded with HA. In this work HA was grounded for 1 h and 6 h by a rotational ball mill to study the effect of grinding on the hydration of HA and properties of HA-bonded castables.
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The effect of curing temperature of high alumina
Stratlingite is one of the constituent minerals of the bonding matrix of low–cement castables. In this study the crystallization processes of stratlingite in hydrates of high alumina cement at 60 °C and 10 °C were analyzed using X–ray diffraction (XRD) and electron probe microanalyzer (EPMA). The stratlingite has crystallized in large quantities in the samples cured at 60 °C while in
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Effect of different additives on the properties of alumina
castament FS20 have higher flow values and better final properties comparing with castables including Darvan 7S and TPP. Also in this study we investigated the effect of addition of microsilica up to 4 wt. on the properties of alumina-spinel castables.
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SciELOBrasilThe effect of microsilica and refractory
The bonding system in low cement castables is achieved by the use of calcium aluminate cement microsilica and reactive alumina. The lime/silica ratio critically impacts the liquid phase formation at high temperatures and subsequently the corrosion resistance and the mechanical and physical properties of
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Effect of Deflocculants on High Alumina Low Cement
· Effect of Deflocculants on High Alumina Low Cement Castables 12 P a g e. or vibration to take shape. Usually the castable tends to be self-flowing in nature if the distribution coefficient (q) is less than 0.25 and tends to be vibratable if the distribution coefficient is more than 0.25.
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Microsilica in alumina based ultralow-cement castables
Microsilica in alumina based ultralow-cement castables. The effect of microsilica additions on flow. Bjern Myhre Presented at the XXIII ALAFAR Congress in Puerto Vallarta Mexico November 6-10 1994 1 Elkem W- Refractories Microsilica in alumina based ultralow-cement castables. The effect of microsilica additions on flow.
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Effect of different surfactants on the properties of
· Results are presented from comparison tests of different thinners-dispersants made by the companies "SKW Polimers " and "Alcoa" and the OOO "Poliplast." The tests were performed under comparable conditions to determine how these additives affect the physico-ceramic properties of refractory concretes based on Chinese-produced sintered bauxite of grade Rota HD and high-alumina
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Effect of Additives on the Expansion Behavior of Alumina
Alumina–spinel castables were prepared using tabular alumina and coarse spinel as aggregates calcium aluminate cement fused alumina fines spinel fines and ultrafine alumina as matrixes. Effect of microsilica and dispersant on the properties of alumina–spinel castables were investigated in this paper. The results show that with the same content of microsilica addition the values of
Get PriceEffect of Alumina Fines on High Alumina Self-flow Low
· Effect of Alumina Fines on High Alumina Self-flow Low Cement Castables. Ritwik Sarkar Anwesha Parija. Department of Ceramic Engineering National Institute of Technology 769008 Rourkela/India. Revision . Volume 6 Issue 1 Pages 7378. Abstract
Get PriceEffect of grinding on the hydration of hydratable alumina
· Hydratable alumina (HA) is a superior Ca-free refractory binder but the quick hydration rate restricts the working time of castables bonded with HA. In this work HA was grounded for 1 h and 6 h by a rotational ball mill to study the effect of grinding on the hydration of HA and properties of HA-bonded castables.
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Densification characteristics of chromia/alumina castables
· Otroj S Sagaeian A Daghighi A Nemati ZA The effect of nano-size additives on the electrical conductivity of matrix suspension and properties of self-flowing low-cement high alumina refractory castables. Ceramics International 2010 36 1411–1416. 10.1016/j.ceramint.2010.02.008. Article Google Scholar Download references
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The effect of curing temperature of high alumina
Stratlingite is one of the constituent minerals of the bonding matrix of low–cement castables. In this study the crystallization processes of stratlingite in hydrates of high alumina cement at 60 °C and 10 °C were analyzed using X–ray diffraction (XRD) and electron probe microanalyzer (EPMA). The stratlingite has crystallized in large quantities in the samples cured at 60 °C while in
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The effect of curing temperature of high alumina
Stratlingite is one of the constituent minerals of the bonding matrix of low–cement castables. In this study the crystallization processes of stratlingite in hydrates of high alumina cement at 60 °C and 10 °C were analyzed using X–ray diffraction (XRD) and electron probe microanalyzer (EPMA). The stratlingite has crystallized in large quantities in the samples cured at 60 °C while in
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Study on the Effect of Deflocculant Variation in High
The effect of three different types of deflocculants and their amounts on high-alumina low-cement castables is studied. Castable formulations were done as per continuous particle size distribution of a Dinger-Funk model using a distribution coefficient of q = 0.21.
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Low Cement High Alumina Castables Effect of
· Low Cement High Alumina Castables Effect of Distribution Coefficients 7 P a g e LIST OF TABLES Sl. No. Table Page No. 1. List of size fractions and the corresponding raw materials 25 2. List of chemical constituents of the raw materials 25 3. List of physical properties of raw materials 26 4. List of particle size and corresponding CPFT for
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Effect of Additives on the Expansion Behavior of Alumina
Alumina–spinel castables were prepared using tabular alumina and coarse spinel as aggregates calcium aluminate cement fused alumina fines spinel fines and ultrafine alumina as matrixes. Effect of microsilica and dispersant on the properties of alumina–spinel castables were investigated in this paper. The results show that with the same content of microsilica addition the values of
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Effect of Micro-Sized Alumina Powder on the Hydration
Micro-sized alumina powder is widely used in low cement high-alumina refractory castables. The hydration of calcium aluminate cement can be affected by adding micro-sized alumina powder. This work addresses the hydration of a commercial cement at 25°C with 50 wt micro-sized alumina powder added. The hydration heat was measured by isothermal micro-calorimetry.
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Effect of heat treatment and zircon addition on the
· Mullite was detected only in castables with 5 high alumina cement and 3 micro silica fired at ≥ 1400 °C. The formation of anorthite and mullite bonding phases after firing at ≥1400 °C resulted in a low creep rate high spalling resistance high sintering ability and high CCS.
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Properties of alumina based low-cement self flowing
Abstract The main aspects that determine flowing properties of self flowing alumina based low-cement castables are determined. From the point of view of particle size distribution different particle size distributions are compared by using Andreassen model according to n -value.
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Effects of Different Barium Compounds on the Corrosion
· Barite reactions with alumina and silica present in the fine particles of the refractories results in the formation of hexa-celsian and/or celsian at firing temperatures ranging between 1173 K to 1473 K (900 °C to 1200 °C). 24 26 Koshy et al. investigated the effect of BaSO 4 contents in high-alumina refractories on the interfacial reactions
Get PriceLow cement high alumina castables Effect of distribution
Refractory materials used in various areas of the iron and steel industry need to face severe challenges to meet critical operational parameters at high temperatures. Hence the attention of refractory manufacturers has shifted towards unshaped refractories to substitute for conventional and shaped ones. Castables lead in all the areas among the different unshaped refractories.
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The effect of nano-size additives on the electrical
· It is found that higher contents of these used additives have a disadvantage in the strength development. If the FS 20 contents in the high alumina low-cement self-flowing castables are increased up to 0.1 its flow remains stable up to 45 min but the green strength after 24 h is reduced. This phenomenon is possibly related to the absorption of polycarboxylate ether molecules on cement
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Effect of dispersants on the hydrate morphologies of
· The high-alumina refractory castable samples were prepared with tabular alumina as aggregates and α-Al 2 O 3 and cement as the matrix constituents (as shown in Table 2).For such LCCs in which the water content is minimized and to obtain the maximum density the particle size distribution has been optimized based on the packing model proposed by Andreassen (1) CPET = (D / D L) q
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Low Cement High Alumina Castables Effect of
· Low Cement High Alumina Castables Effect of Distribution Coefficients 7 P a g e LIST OF TABLES Sl. No. Table Page No. 1. List of size fractions and the corresponding raw materials 25 2. List of chemical constituents of the raw materials 25 3. List of physical properties of raw materials 26 4. List of particle size and corresponding CPFT for
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The Effects of Fine and Ultra-fine Particles on the Design
· gates and the additives in order to bind the material. There are four bonding systems † ceramic bonding obtained by sintering at high temperature † hydraulic bonding obtained by the hydra-tion of an alumina-lime refractory cement † inorganic chemical bonding that occurs through the formation of gels † organic bonding mostly with carbona-
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Effect of Deflocculants on High Alumina Low Cement Castables
In this project the effect of different types of deflocculant and its amount on high alumina low cement castables is observed. As the flowability is dependent on the particle size distribution and packing of the castable system the particle size ranges follow a continuous distribution approach based on
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