Spinel In situ versus PreformedClearing the Myth
· 4 In-situ versus preformed spinel The formulation of castables containing pre-reacted spinel and that of spinel forming alumina-magnesia castables require in gen-eral different approaches whereby the for-mulation of alumina-magnesia-castables is in general more challenging. The use of mag-nesia as one of the reactants for the spinel-formation
Get PriceA comparative study between Direct Spinel Addition and
· The major objective of this work is to study the difference in properties of spinel containing high alumina refractory castables prepared by two different methods namely in-situ spinelisation and direct spinel addition. Also the effect of two different types of cement having different alumina composition was observed.
Get PriceImprovement in Slag Resistance of No-Cement Refractory
· the cement was replaced by the cement-free binders. Keywords no-cement castables slag resistance 1. Introduction Due to the excellent corrosion resistance to basic slags and good thermo-mechanical properties either in situ forming or pre-formed spinel (MgAl2O4) containing cement bonded refractory castables
Get PriceSlag attack evaluation of in situ spinel-containing
· Thus this work addresses the slag attack evaluation of four designed in situ spinel-containing castables (containing hydratable alumina or calcium aluminate cement as a binder source and 0 or 1 wt of silica fume) when in contact with a Fe x O rich industrial slag. Corrosion cup-tests microstructural characterization and a two-step thermodynamic simulation model were used in order to investigate the reactions taking place during the slag–refractory
Get Price22 TECHNICAL PAPER Refractory Considerations for
· is exceeded the refractory loses their protection. Another approach is to add a phosphate as it imparts highly non-wetting properties to the refractory and does not decompose until temperatures >1500oC are reached 13. In brick it was incorporated into the mix prior to fi ring in castables it can be the bonding agent or supplement it and
Get PriceFIRE Compendium Series Vol. 1 Refractory Castable
· 3. Formulation design with in situ spinel formation 530 3.1. Mechanism of in situ spinel formation 531 3.2. Mastering the microstructure to optimize the spinel-forming castable properties 537 4. Final remarks 577 5. References 579 6. Further reading 591 Chapter 9 Carbon-containing refractory castables design properties and applications 1.
Get PriceEvolution of in Situ Refractories in the 20th Century
Feng Wang Pingan Chen Xiangcheng Li and Boquan Zhu Effect of micro-spinel powders addition on the microstructure and properties of alumina refractory castables Ceramics International 10.1016/j.ceramint.2018.10.049 (2018).
Get PriceRecent advances in refractories — aluminate binders and
· shotcreting. The selection of calcium aluminate binders must be considered carefully in the quest to optimize performance and instal-lation success of refractory monolithics. The paper discusses recent advances in aluminate binders for high-performance castables. A specific focus will be the key issues that impact the reliability and
Get PriceImprovement in Slag Resistance of No-Cement Refractory
The corrosion resistance of spinel containing cement bonded castables has been extensively investigated in the past. However corrosion of no-cement refractory castables (NCC) has not been widely studied since the use of NCC has been relatively limited up till now. This paper focuses on the slag resistance of NCCs and the often-used spinel containing low cement castable (LCC) is used as the
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· Phosphate and sulfate binders are also highly regarded because they create adequate chemical bonds between particles of the refractory materials. Prior studies have also shown that tripolyphosphate binders can efficiently improve the performance and strength of
Get PriceWorking Conditions of Different Types of Refractory Castables
· Get Free Quote. If the furnace shell requires low temperature it is necessary to use double-layer insulation to solve it that is first ceramic fiber and then light insulation castable or directly use ceramic fiber block to solve it. However if there is a weight requirement in the insulation area use a specific gravity of 0.6-0.8 as the insulation layer.
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· In China research has indicated that in-situ spinel is favouring refractory performance such as is in alumina-magnesia castables for steel ladles. But Prof. Zhou Ningsheng warned "Nevertheless the hydration of magnesia remains a concern or a problem.
Get PriceImprovement in Slag Resistance of No-Cement Refractory
· the cement was replaced by the cement-free binders. Keywords no-cement castables slag resistance 1. Introduction Due to the excellent corrosion resistance to basic slags and good thermo-mechanical properties either in situ forming or pre-formed spinel (MgAl2O4) containing cement bonded refractory castables
Get PriceWorking Conditions of Different Types of Refractory Castables
· Get Free Quote. If the furnace shell requires low temperature it is necessary to use double-layer insulation to solve it that is first ceramic fiber and then light insulation castable or directly use ceramic fiber block to solve it. However if there is a weight requirement in the insulation area use a specific gravity of 0.6-0.8 as the insulation layer.
Get PriceEvolution of in Situ Refractories in the 20th Century
Feng Wang Pingan Chen Xiangcheng Li and Boquan Zhu Effect of micro-spinel powders addition on the microstructure and properties of alumina refractory castables Ceramics International 10.1016/j.ceramint.2018.10.049 (2018).
Get PriceA comparative study between Direct Spinel Addition and
· The major objective of this work is to study the difference in properties of spinel containing high alumina refractory castables prepared by two different methods namely in-situ spinelisation and direct spinel addition. Also the effect of two different types of cement having different alumina composition was observed.
Get PriceOptimization of Properties for Alumina-Spinel Refractory
Aiming at optimizing properties of alumina-spinel refractory castables coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al2O3) aggregate in the same size. Properties including the bulk density apparent porosity strength slag corrosion resistance thermal shock resistance and thermal fatigue resistance of alumina-spinel
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· Binary compounds such as tungsten carbide or boron nitride can be very refractory. Hafnium carbide is the most refractory binary compound known with a melting point of 3890 °C. The ternary compound tantalum hafnium carbide has one of the highest melting points
Get PriceREFRACTORY 96 Proceedings of the International
· 23. Bauxite-MA Spinel Bricks for Ladle 224 Hong Xueqing Yang Xiwen Chen Jiawei Zhang Changli Liu Wenge 24. The Effect of Spinel on the Properties of Corundum Low Cement Castables 230 He Zhiyong Zhang Xiaojun. Li Lin 25. Refractory Selection for Stainless Steelmaking Processes 235 Dr. Stradtmann Dr. Kuhlmann CD. Hahn R.C. Thomas 26.
Get PriceEvolution of in Situ Refractories in the 20th Century
Feng Wang Pingan Chen Xiangcheng Li and Boquan Zhu Effect of micro-spinel powders addition on the microstructure and properties of alumina refractory castables Ceramics International 10.1016/j.ceramint.2018.10.049 (2018).
Get PriceLatest Development in Refractory Monolithics
· impact areas purging plugs and well blocks. The reduced erosion resistance of in-situ spinel formulations will reduce the life and increase operating cost. Recently with a combination of pre-formed spinel and in situ spinel improvements were obtained on the following castable properties -0.20 0.00 0.20 0.40 0.60 0.80 1.00 1.20
Get PriceSelection of binders for in situ spinel refractory castables
· Calcium aluminate cement (CAC) is the typical binder used in in situ spinel refractory castables showing benefits such as suitable working setting and demoulding time and also corrosion resistance. 8 Nevertheless CAC additions in these castables may lead to further expansion attributed to CA 2 and mainly CA 6 formation. 5 9 10
Get PriceImprovement in Slag Resistance of No-Cement Refractory
The corrosion resistance of spinel containing cement bonded castables has been extensively investigated in the past. However corrosion of no-cement refractory castables (NCC) has not been widely studied since the use of NCC has been relatively limited up till now. This paper focuses on the slag resistance of NCCs and the often-used spinel containing low cement castable (LCC) is used as the
Get PriceIn Situ Spinel Formation in a Smart Nano-Structured
· In Situ Spinel Formation in a Smart Nano-Structured Matrix for No-Cement Refractory Castables Dominika Madej and Karina Tyrała Department of Ceramics and Refractories Faculty of Materials Science and Ceramics AGH University of Science and Technology al. A. Mickiewicza 30 30-059 Krakow Poland ktyrala agh.edu.pl
Get PriceIn Situ Spinel Formation in a Smart Nano-Structured
· In Situ Spinel Formation in a Smart Nano-Structured Matrix for No-Cement Refractory Castables Dominika Madej and Karina Tyrała Department of Ceramics and Refractories Faculty of Materials Science and Ceramics AGH University of Science and Technology al. A. Mickiewicza 30 30-059 Krakow Poland ktyrala agh.edu.pl
Get PriceImprovement in Slag Resistance of No-Cement Refractory
· the cement was replaced by the cement-free binders. Keywords no-cement castables slag resistance 1. Introduction Due to the excellent corrosion resistance to basic slags and good thermo-mechanical properties either in situ forming or pre-formed spinel (MgAl2O4) containing cement bonded refractory castables
Get PriceRecent advances in refractories — aluminate binders and
· shotcreting. The selection of calcium aluminate binders must be considered carefully in the quest to optimize performance and instal-lation success of refractory monolithics. The paper discusses recent advances in aluminate binders for high-performance castables. A specific focus will be the key issues that impact the reliability and
Get PriceWhat are the commonly used additives and binders for
In refractory castables it is often used to add a small amount of additives to achieve the purpose of sintering and improve certain properties of the product. Mineralizers are often used to control the formation or reaction of substances. TiO2 is a mineralizer commonly used in the synthesis of magnesia-alumina spinel.
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· experience that may be applied to fabricating refractory shapes. This paper also describes the opportunities gained by using Alphabond as an alumina source to develop in situ bonding in calcia-free no-cement castables to form mullite and magnesium aluminate spinels. No-cement castables containing hydratable alumina binders are now being used
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