alumina and magnesia based castables containing
Effects of SnO2 Addition on the Properties of Alumina
Alumina-magnesia refractory castables have been widely used in the wall and bottom impact pad of steel ladles. The properties of alumina-magnesia refractory castables with SnO 2 additive in 05 wt range were investigated. The phase composition microstructure physical and mechanical properties of these refractories were studied.
Get PriceHydraulically-bonded monolithic refractories containing a
However the test results demonstrate that the refractory castables according to the present invention have improved control over working and set times as compared to refractory castables containing only hydratable alumina as the binder. EXAMPLE 4. A hydraulically-bonded refractory castable having the following formulation was prepared
Get PriceEffects of fine reactive alumina powders on properties of
Apr 01 2018 · The compositions of alumina-magnesia castables comprised tabular and reactive alumina calcined magnesia (95 purity) calcium aluminate cement and microsilica as listed in Table 1. Titania was selected as a mineralizing agent. For comparison
Get PriceBoron sources as sintering additives for alumina-based
Fig. 3. Free-flow values of alumina-based castables containing 2 wt of hydratable alumina and different contents (0.0 0.5 1.0 or 2.0 wt ) of boron sources (B2O3 H3BO3 Fig. 4. Cold flexural strength of the designed castables after curing (50 °C/24 h) and sodium borosilicate BS magnesium borate BM or B4C) as sintering additives
Get PriceEffects of Rare Earth Chlorides on Properties of Al2O3-MgO
For the urgent requirements of high performance castables in iron and steel making industry effects of rare earth chlorides on properties of Al2O3-MgO castables were addressed. The prepared castables were compared in terms of phase compositions apparent porosity bulk density permanent linear change and strength. It was demonstrated that cerium chloride and yttrium chloride exhibited a
Get PriceEffects of Rare Earth Chlorides on Properties of Al2O3-MgO
For the urgent requirements of high performance castables in iron and steel making industry effects of rare earth chlorides on properties of Al2O3-MgO castables were addressed. The prepared castables were compared in terms of phase compositions apparent porosity bulk density permanent linear change and strength. It was demonstrated that cerium chloride and yttrium chloride exhibited a
Get PriceEFFECTS OF MnO ADDITIONS ON THE PROPERTIES OF
The compositions of the alumina-magnesia refractory castables are listed inTable 1. Tabular alumina (6 mm) was used as the aggregate. The matrix of castables included fine tabular alumina reactive alumina and cal- cined magnesia. Calcium aluminate cement acted as the binder of castables.
Get PriceUnshaped Refractories
Evaluation of a Microsilica-Based Additives in Al 2 O 3 –MgO Refractory Castables. The first heating cycle of MgO-containing refractory castables is usually considered a challenge by the producers of such products due to the significant mass loss associated with magnesium hydroxide decomposition between 350–450 °C that might result in their spalling or even explosion.
Get Price(PDF) Spinel-containing alumina-based refractory castables
The main variables considered are the spinel content and grain size the effect of calcium aluminate cement and hydratable alumina on the general castables properties the influence of different
Get PriceAluminum lactate role in improving hydration and drying
bonded refractory castables D. S. Fini (1) magnesia containing compositions aluminum lactate (aluminum salt of 2-hydroxypropanoic Table 1Magnesia-based suspensions prepared with and without AL for the evaluation of the likely chemical reactions that
Get PriceSpinel-containing alumina-based refractory castables
Aug 01 2011 · The formulation of castables containing pre-reacted spinel and that of spinel forming alumina-magnesia castables requires different approaches. The use of magnesia as one of the reactants for the spinel formation in castables often causes difficulties such as poor flow or quick setting due to the magnesia hydration.
Get PriceUnshaped Refractories
Evaluation of a Microsilica-Based Additives in Al 2 O 3 –MgO Refractory Castables. The first heating cycle of MgO-containing refractory castables is usually considered a challenge by the producers of such products due to the significant mass loss associated with magnesium hydroxide decomposition between 350–450 °C that might result in their spalling or even explosion.
Get PriceSpinel In situ versus PreformedClearing the Myth
High alumina castables with spinel and/or magnesia addition are the most com- mon monolithic lining today and their differ- fully in use.
Get PriceStudy of Spinel-Containing High Alumina Castable with
High alumina castable with presynthesized and in situ spinel formation is studied using two different lime-containing high alumina cements. Vibratable castable compositions were studied by conventional processing using a distribution coefficient of 0.29 and heat treatments at 110 900 and 1500°C.
Get Priceمقاله Investigations on the Influence type of alumina
For this purpose the influence of five types alumina on solid state reaction of alumina and magnesia in bauxite-based refractory castables on compressive strength were investigated. The results show that the most effective material for the improving compressive strength is alumina reactive.
Get PriceEffects of SnO2 Addition on the Properties of Alumina
Alumina-magnesia castables were prepared according to the Alfred packing model (q = 0.26). The compositions (Table 1) comprised tabular aluminas (T60 Almatis) as aggregates reactive alumina (CL370 Almatis) cal- cined magnesia (95 wt ) as the main matrix components and calcium aluminate cement as the binder source (Secar 71 Kerneos).
Get PriceRefractoryWikipedia
They include substances such as silica alumina and fire clay brick refractories. Notable reagents that can attack both alumina and silica are hydrofluoric acid phosphoric acid and fluorinated gases (e.g. HF F 2). At high temperatures acidic refractories may also react with limes and basic oxides.
Get PriceEffects of SnO2 Addition on the Properties of Alumina
Alumina-magnesia castables were prepared according to the Alfred packing model (q = 0.26). The compositions (Table 1) comprised tabular aluminas (T60 Almatis) as aggregates reactive alumina (CL370 Almatis) cal- cined magnesia (95 wt ) as the main matrix components and calcium aluminate cement as the binder source (Secar 71 Kerneos).
Get Pricelink.springer
A comparison among various sol-gel bonding systems has been done for high alumina castable refractory. Four different sol systems namely alumina boehmite mullite and spinel have been synthesized and used individually as sole binder in high alumina castable system with particle size distribution coefficient of 0.23 as per Dinger and Funk model.
Get PriceMonolithics — Mayerton Refractories Refractories
Ramming mixes are available based on basic high alumina and alumina silicate raw materials. Mid Alumina Castable . Utilising raw ingredients commonly associated with the 50 60 class range of bricked products. Products in this range contain low iron calcium aluminate cements with additions in the region of 5 (low cement) to 15 .
Get Priceمقاله Investigations on the Influence type of alumina
For this purpose the influence of five types alumina on solid state reaction of alumina and magnesia in bauxite-based refractory castables on compressive strength were investigated. The results show that the most effective material for the improving compressive strength is alumina reactive.
Get PriceAluminum lactate role in improving hydration and drying
bonded refractory castables D. S. Fini (1) magnesia containing compositions aluminum lactate (aluminum salt of 2-hydroxypropanoic Table 1Magnesia-based suspensions prepared with and without AL for the evaluation of the likely chemical reactions that
Get PriceFull article Reasons for crack propagation and strength
Apr 25 2019 · 2.2. Magnesium oxide containing castables. Magnesium oxide or magnesia (MgO) is known as one of the most important raw materials used in the refractory industry. The presence of this oxide in refractory compositions is recommended due to its refractoriness high corrosion resistance and desirable spinel phase properties when reacted with alumina.
Get PriceReasons for crack propagation and strength loss in
cement-containing castables on castables 3 4 15–17 . 2.1.1.2. Hydratable alumina. Another hydraulic binder system which has attracted great attention for noncement castables is hydratable alumina (HA) with a large surface area (>150 m2/g). In contact with water or water vapor this binder partially dissolves
Get PriceStudy of Spinel-Containing High Alumina Castable with
High alumina castable with presynthesized and in situ spinel formation is studied using two different lime-containing high alumina cements. Vibratable castable compositions were studied by conventional processing using a distribution coefficient of 0.29 and heat treatments at 110 900 and 1500°C.
Get PriceOxidation-Reduction Reactions RedoxShodor
Practice Redox Problem balance the following redox reaction in acidic solution S(s) NO 3-(aq) --> SO 2 (g) NO(g). The redox solution is available.. Practice Electrolysis Problem It takes 2.30 min using a current of 2.00 A to plate out all of the silver from 0.250 L of a solution containing Ag .What was the original concentration of Ag in solution . The electrolysis solution is available.
Get Price
