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Aluminum melting furnaces and aluminum alloy process kilns often use amorphous refractory linings (also known as refractory castables) as lining materials. These refractory furnace linings are mainly used to protect the furnace walls, bottom, and top from high temperature, corrosion, and mechanical impact to ensure long-term stable operation of the kiln. The following are some main features and introduction of unshaped refractory linings: High-temperature resistance: The amorphous refractory furnace lining can withstand high-temperature environments, and can usually withstand temperatures in the furnace as high as 2,000 degrees Celsius or more. This is critical due to the high-temperature requirements during the production of molten aluminum and aluminum alloys. Chemical stability: These refractory furnace linings generally have good resistance to chemical attack and can resist chemical attack in aluminum and aluminum alloy melts, preventing corrosion and wear of materials inside the kiln. Thermal shock resistance: During the aluminum smelting process, the furnace may experience drastic temperature changes. The amorphous refractory lining has good thermal shock resistance and can withstand these drastic temperature changes without damage. Thermal insulation performance: Amorphous refractory furnace lining usually has a low thermal conductivity, which helps to maintain high temperatures in the furnace, reduce energy loss, and improve...
Steel rolling heating furnaces usually use high refractory materials to withstand high temperature and thermal cycle environments to ensure that the heating process in the furnace is stable and continuous. The following are some common refractory materials used in steel rolling heating furnaces and related precautions: Refractory bricks: Refractory bricks such as high alumina bricks, quartz bricks, and silicon carbide bricks are often used inside rolling steel heating furnaces because they have good high-temperature resistance and chemical stability. Take care to select refractory bricks that are suitable for specific operating conditions, as different furnace temperatures and thermal cycle requirements may vary. Refractory insulation: Refractory ceramic fibers or graphite fibers are often used as linings or insulation to reduce heat loss and improve energy efficiency. These fibrous materials can maintain their insulating properties at high temperatures but require careful handling to prevent the fibers from fraying and drifting. Refractory coatings: Some refractory coatings can be used to protect furnace walls and bottoms to increase the life and performance of the refractory materials. These coatings can increase the wear and corrosion resistance of the surface. Precautions: a. Temperature control: Ensure that the temperature and heating process in the furnace are well controlled...
Refractory castable materials are widely used in high-temperature fields. Their convenient construction performance and usability, compared with refractory bricks of the same material, greatly shorten the construction period, improve the construction site environment, increase maintenance efficiency, and reduce costs. Refractory castable materials made of different materials have different uses and construction methods. The construction method of refractory castables is as follows: 1. Pour water directly into the overall lining, such as high-aluminum castables, low-cement castables, etc. The mold needs support. 2. The pouring construction part cannot use self-flowing molding according to the complexity of the pouring part. Commonly used low-cement self-flowing castables do not need to support molds; 3. Using the smearing method for construction, no kiln mold is required and the lining is thin, saving time and effort. Such as refractory coatings; 4. Adopt mashing construction, fill the material into the furnace shell, and mash it vigorously with the help of mashing tools to obtain a strong density, which can be directly put into production to form a ceramic structure at high temperature; 5. For construction using the gunning method, spraying equipment is required to spray the mixed material directly to the construction site. 6. Press the material directly...
High-strength wear-resistant castables are suitable for severely worn parts of industrial kilns. Their density is higher than that of general refractory castables. They have strong wear resistance and can withstand high-temperature impact and soft-load shearing capabilities. The biggest characteristics of wear-resistant castables are pressure resistance, bending resistance, and wear resistance. This has something to do with the coolness of the craftsmanship and the use of raw materials. The raw materials used in wear-resistant materials contain high aluminum content and high volume density, and the particles in the process ratio are larger than ordinary materials. Adding a certain proportion of silicon carbide composite in the process can improve the bending resistance and wear resistance of the castable. If a reasonable proportion of steel fibers is added to the wear-resistant castable, the tensile capacity can be improved and the use effect will be better. During the production process, adding heat-resistant stainless steel fibers to aggregates and powders can prevent differences at high temperatures and resist stress caused by temperature gradient changes when starting and stopping the furnace. The integrity of the furnace wall after pouring also increases traction capacity due to the addition of steel fibers. If nickel-plated stainless steel is added...
High-alumina refractory cement, also known as aluminate cement, is a kind of high-temperature-resistant amorphous refractory material used for refractory brick masonry. Its alumina content is generally above 51.1%. It is an indispensable refractory material in the construction of industrial furnaces in other industries. As an indispensable refractory material in the construction of high-temperature kilns, high-alumina refractory cement has the characteristics of high-temperature resistance, fast setting time, high strength, and is not easy to peel. It has good fire resistance, so it is widely used in high-temperature kilns During the construction, today I will introduce to you some characteristics of high alumina refractory cement. Features of high alumina refractory cement: 1. Good high-temperature resistance: The main components of high alumina refractory cement are cement clinker, silicate, aluminate, and other substances, which contain refractory aggregates, so they have high fire resistance and can usually withstand high temperatures around 1500 ° C. It can maintain stable performance in the environment. 2. Good corrosion resistance: Because the raw materials of high-alumina refractory cement contain a large amount of alumina, silica, and other components, these substances have good corrosion resistance, so high-alumina refractory cement also has good corrosion resistance and can resist high-temperature kiln Produces...
Andalusite is an aluminosilicate mineral that mainly exists in the contact zone between argillaceous rocks and intrusive bodies. It is a typical contact thermal metamorphic mineral. As a raw material for refractory materials, it has high thermal stability and is an excellent refractory raw material, Andalusite can be used not only as a raw material for unshaped refractory materials but also as a raw material for shaped refractory materials. After calcination, andalusite can form mullite, which has high refractoriness, chemical stability, and mechanical strength, so it is widely used in metallurgy, building materials, and other industrial sectors. Generally speaking, it can turn into mullite when heated to 1300°C, which is a very good raw material for refractory materials. As a raw material for refractory bricks, andalusite bricks have very good thermal stability. As a raw material for unshaped refractory materials, andalusite can reduce the shrinkage of refractory materials under long-term high temperatures, ensure that the refractory materials do not shrink and peel, and increase the service life of the refractory materials. As a raw material for shaped refractory materials, andalusite refractory bricks have the characteristics of rapid cooling and heat resistance, high mechanical strength, strong thermal shock resistance, strong slag...
High alumina heat storage balls, also known as spherical heat storage bodies, have the advantages of good thermal shock stability, large heat storage, high strength, easy cleaning, and reusability. Working principle and characteristics: 1. High-aluminum heat storage balls are many small balls that divide the airflow into small streams. When the airflow flows through the heat conductor, it forms strong turbulence and breaks through the boundary layer on the surface of the heat conductor. The ball diameter is very small and the conduction radius is very small. Small, small thermal resistance, high density, good thermal conductivity, so it can meet the requirements of frequent and rapid reversing of heat conduction burners. 2. The heat conductor can be reversed 20~30 times. After the high-temperature flue gas flows through the heat conductor bed, the flue gas can be reduced to about 130°C and discharged. 3. The high-temperature gas and air can be preheated to only about 100°C lower than the flue gas temperature in the same path through the heat conductor, and the temperature efficiency is as high as more than 90%. 4. Due to the very small size of the heat conductor, the flow capacity of the high-alumina heat storage ball...
Refractory cement is the connecting material between refractory bricks and refractory bricks. It is one of the amorphous refractory materials. Although refractory cement is divided into various materials, there are several keys to judging the availability of refractory cement. The first is the fluidity and viscosity of refractory cement. If the refractory cement has insufficient viscosity, it will not bond during construction, which will delay the construction process. Judging the adhesion at the construction site means that after adding an appropriate proportion of drinking water to the refractory cement, if it is phosphate mud, after adding an appropriate proportion of phosphoric acid binder on site, fill it with a shovel or other utensils, and it will be continuous when it falls Yes, which means liquidity is OK. The other is bonding time. If it takes two hours for the mortar after construction, it will not condense for a maximum of three hours. Indicates that the use effect is not good. Many manufacturers will use two refractory bricks to wipe the refractory cement before construction. If the initial condensation occurs after 30 times, it means that the refractory cement has a good connection. Since refractory materials are an applied discipline, some...
We know that aluminum solution has very high activity and permeability. During the smelting process of an aluminum melting furnace, adhesion and penetration often occur that are not conducive to smelting. These will also lead to more impure impurities in the smelted metal. These reasons are all caused by the poor selection of refractory materials for aluminum melting furnaces. To solve this problem, a refractory material such as non-stick aluminum castable has appeared, which is produced for such aluminum melting furnaces. The reason why non-stick aluminum castables can solve the above problems is mainly that they add different proportions of additives based on high-aluminum castables, which can make the castables dense, and good density can prevent aluminum At the same time, it can form a reflective layer on the surface of the castable to prevent the aluminum liquid from bonding to the castable and destroying the structure of the castable, thus preventing the penetration and adhesion of the aluminum liquid. Non-stick aluminum castables can be used in many aluminum melting furnaces mainly because they can extend the service life of aluminum melting furnaces, do not produce aluminum ash or corundum during the smelting process, and can prevent molten aluminum from...
We all know that high-aluminum castable is a refractory castable with relatively high alumina content. It is widely used in the construction of high-temperature kilns. It has the characteristics of superior refractory performance, high-temperature resistance, corrosion resistance, and oxidation resistance. Therefore, the range and frequency of use are very high, but it is very important to choose high-aluminum castables that are effective when purchasing. Its quality determines the service life of the high-temperature kiln and the smelted materials during use. The quality of the material. First of all, we need to know that high-aluminum castables are composed of aluminates, silicates, oxides, etc. To ensure the effect in high-temperature environments, we must strictly follow the requirements when proportioning raw materials. , incorrect proportion of raw materials will seriously affect the performance of the entire castable, so we need to confirm with the manufacturer’s technical staff when purchasing, and inform the technical staff according to the occasion of use, and the technical staff will according to your use occasion There are many options for you. Secondly, the quality of high-aluminum castables during our use mainly depends on the following aspects, including compressive strength, thermal stability, thermal conductivity, thermal expansion coefficient, etc. These...
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