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Aluminum melting furnace is a kind of equipment used for melting and heat preservation of aluminum ingots. It can well meet the process of aluminum smelting. The furnace is composed of a melting furnace, crucible, heating element, furnace cover lifting mechanism, and electrical automatic temperature control. system etc. The temperature of the aluminum melting furnace during the smelting process is actually not high, but the activity of aluminum is very high after melting, and it is as pervasive as water, so this requires relatively high requirements for the refractory materials used in the construction process of the aluminum melting furnace. If the refractory material used in the casting process is not correct, it is easy to cause the structure of the refractory material to gradually loosen and peel off, and damage the refractory material; moreover, aluminum and its alloys are very easy to have physical and chemical reactions with impurities in the refractory material. Substances can affect the quality of aluminum products. So what are the refractory castables commonly used in the construction of aluminum melting furnaces? 1. Non-stick aluminum castable Non-stick aluminum castables are mainly new materials with low cement content and ultrafine powder combination based on high-purity mullite,...
The refractory ball is a kind of spherical refractory material made of industrial alumina and refractory kaolin after a certain scientific ratio and fired at high temperature. A kind of fire-resistant ball, which has the characteristics of high strength, high hardness, high wear resistance, etc., so what occasions are high-alumina fire-resistant balls generally used in, today Xinhongji Refractory will give you a brief introduction to the use of high-alumina fire-resistant balls. Refractory balls are divided into ordinary refractory balls and high-alumina refractory balls. Ordinary refractory balls are suitable for converters and converters in the sulfuric acid and fertilizer industries. High-alumina refractory balls are suitable for hot blast stoves and heating converters in urea, steel, and other industries. As a refractory material, high alumina refractory balls are widely used in ceramic firing, enamel firing, glass firing, chemical, and other factories due to their small size, high-temperature resistance, corrosion resistance, and pollution-free. They are mainly stacked in industrial kilns and can achieve the effect of heat storage. Due to the high-temperature resistance of the refractory ball, its highest refractory temperature can reach about 1900 degrees, so it is also especially suitable for high and low-temperature conversion furnaces, reformers, hydrogenation converters, desulfurization tanks...
High-alumina low-cement castable is a kind of refractory castable made of high-alumina bauxite clinker as aggregate, refractory clay as powder, adding aluminate cement and sodium tripolyphosphate according to the formula ratio. The cement content is less than 8%, which is a commonly used high alumina refractory castables for kiln lining. First. Physical and chemical indicators of high alumina and low cement pouring: Second, the characteristics of high-alumina low-cement castables: 1. Good shock resistance. High-aluminum low-cement castables have good shock resistance and can withstand the vibration and impact of equipment during operation. 2. It has good acid and alkali corrosion resistance. Because high alumina bauxite has good acid and alkali resistance, high alumina low cement castables have good acid and alkali resistance. 3. It has good wear resistance. High-aluminum low-cement castables have good wear resistance characteristics, so they can withstand impact and wear during equipment operation. 4. It has good temperature resistance. The refractoriness of high-alumina low-cement castables can reach about 1800 degrees Celsius. In view of some characteristics of high-alumina and low-cement castables, it is widely used in temperature equipment in metallurgy, the chemical industry, building materials, and other industries.
Silicon carbide bricks are one of the silicon carbide refractories. Silicon carbide bricks use silicon carbide as the main raw material. High-purity silicon carbide powder and high-activity silicon carbide are differentially mixed, and after grouting molding, they are vacuum sintered at high temperatures. High-grade refractory bricks for recrystallization. The main content of silicon carbide bricks is SiC, with a content of 72%-99%. Due to the different bonding methods of silicon carbide bricks, the industries and thermal equipment used are also different. Different bonding methods can be divided into clay bonding, sialon bonding, alumina bonding, self-bonding, high aluminum bonding, silicon nitride bonding, and so on. What are the uses of silicon carbide bricks? Where is the main application? Silicon carbide bricks are made of silicon carbide as the raw material. Silicon carbide, also known as emery, is made of quartz sand, coke, wood chips, and other raw materials through high-temperature smelting in an electric furnace. Silicon carbide is often used to make advanced refractory materials due to its stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance. Silicon carbide bricks use the characteristics of silicon carbide, such as corrosion resistance, high-temperature resistance, high strength, good thermal...
High-alumina refractory bricks are generally refractory bricks with very high aluminum content. They are widely used in super-grade high-alumina bricks and are used in electric furnace roofs, blast furnaces, hot blast stoves, blast furnace hearths, blast furnaces, reverberatory furnaces, rotary kiln transition zones, Limekiln and other parts, generally speaking, high-alumina refractory bricks are divided into super-grade high-alumina bricks, first-grade high-alumina bricks, second-grade high-alumina bricks, and third-grade high-alumina bricks. The prices are also different. We look at the price of high-alumina refractory bricks from the grade. The price range generally ranges from a few yuan to hundreds. This price is also based on the aluminum content and weight, so the price range fluctuates relatively large, so In the process of purchasing, it is very important to look at the aluminum content and weight of high-alumina refractory bricks. Generally, when we use high-alumina refractory bricks, we also choose different grades of high-alumina refractory bricks according to different usage occasions. In this way, we can not only control the cost but also ensure the use requirements of the application environment. When customers purchase, first of all, It is necessary to provide refractory brick manufacturers with drawings of special-shaped bricks and communicate whether they...
Honeycomb ceramic regenerators are widely used in energy-saving technology of industrial thermal equipment, which can improve the efficiency of industrial thermal equipment, reduce energy consumption, increase productivity, and improve quality. It is an important and effective means to solve energy and environmental problems. The cross-sectional pores of the honeycomb ceramic regenerator mainly have two pore structures of a square and regular hexagon, and the channels are straight channel structures parallel to each other. This structure significantly reduces the resistance of the pores to flow through and greatly improves the heat storage body’s single-pore volume heat transfer efficiency. Product features of honeycomb ceramic regenerator The refractory honeycomb ceramic regenerator has the characteristics of low thermal expansion, large specific heat capacity, large specific surface area, small pressure drop, small thermal resistance, good thermal conductivity, and good thermal shock resistance; it is widely used in regenerative high-temperature combustion technology (HTAC) in the metallurgical machinery industry ), which organically combines the recovery of flue gas waste heat with high-efficiency combustion and reduction of NOX emissions, so as to achieve the goal of extreme energy saving and reduction of NOX emissions. Product function of honeycomb ceramic regenerator 1. There are various materials, and products of...
Non-stick Aluminum Castable FHA-80 Al2O3 80% Aluminum furnace refractory castable Bulk density g/cm3 ≥ 2.8 Compressive strength MPa, 110℃×24h 65 Flexural strength MPa, 1100℃×3h 85 Re-burning line change rate%, 1100°C×3h ±0.15 Operating temperature ℃ 1650 The castable is made of refractory materials such as mullite, bauxite, brown corundum, high-electric fused corundum, superfine powder technology, additives, and dispersion technology; the product has good construction flow performance and a smooth working surface; It has the characteristics of non-sticking aluminum, easy to clean, delaying the growth of corundum tumors, and not reacting with aluminum liquid. Applicable parts: aluminum smelting furnace, molten aluminum holding furnace, vacuum ladle, degassing box, front holding furnace of the die-casting machine, and other parts contacting molten aluminum. Product features: It has the functions of high volume density, high strength, easy cleaning and good thermal shock stability, corrosion resistance, erosion resistance, non-stick aluminum and slag, and prolongs the service life of the furnace lining. Storage method: The products are classified and stacked neatly, and there are obvious signs. It is strictly forbidden to be exposed to moisture, and moisture-proof measures should be taken. At the same time, the test should be carried out, and the test can only be used...
Typical aluminum smelting furnace lining refractory materials are usually made of high-alumina refractory materials, Si3N4 combined with SiC refractory materials. When high-alumina refractory materials are used, since the components such as SiO2 and impurities Fe2O3 in the refractory materials will be reduced to Si and Fe and melt into metallic aluminum, it is difficult to obtain high-purity metallic aluminum. When Si3N4 combined with SiC refractories is used, although impurities can be reduced and melted into metallic aluminum, higher purity metallic aluminum can be obtained, since Si3N4 combined with SiC refractories contains Si components, there is still metal aluminum from Danger of Si pickup in refractory materials. Therefore, producing extremely high-purity aluminum requires a refractory material that does not introduce impurities. According to the chemical principle, among the existing refractory products, it is considered that the corundum refractory material produced by using the same raw material as the aluminum metal—Al2O3 as the raw material can meet the above requirements. This kind of corundum refractory material is mainly made of sintered alumina or tabular alumina and mixed with an appropriate amount of alumina micro powder. The key technology is to use a pure matrix to achieve a self-cleaning structure of alumina to...
The operating environment of the coal gasifier is poor, and the requirements for the use of the refractory lining are relatively strict. General refractory products cannot meet the requirements for use at all, and special refractory products are needed. How to choose refractory materials suitable for the coal gasifier? Please see the introduction of the materials of the fire surface, backing, heat insulation layer, and compressible layer of the gasifier below. The refractories used in gasifiers are easily damaged by refractory bricks, the inner layer facing the fire surface. The working conditions of refractory bricks are very poor: high temperatures up to 1700 ℃, chemical gas erosion, carbon black wear, heavy oil ash corrosion, and drastic changes in temperature and pressure, so special refractory bricks are required. What are the requirements for refractories in coal gasifiers? High-pressure high-temperature slag gasifiers have stricter requirements on refractory materials. In addition to meeting the strength requirements for high-temperature protection of pressure vessels, the corrosion of furnace bricks by slag in high-pressure oxidizing and reducing atmospheres should also be considered. This requires the refractory material of the gasifier to have the following characteristics. 1. It has high-temperature heat resistance to reduce radial heat dissipation,...
Adding steel fibers to refractory castables can improve the wear resistance, thermal shock resistance, and bending strength of the castables, which are favored by customers. The addition of steel fibers can increase the wear resistance of refractory materials, improve the thermal shock resistance and bending strength of castables, etc. Adding steel fibers to refractory castables combines the advantages of the two materials and is favored by customers. Steel fiber castables’ ratio and application are the keys to the product. An excellent ratio can not only improve the various properties of the castable but also embody environmental protection. In the ratio and application of steel fiber castables, the steel fibers used for refractory castables generally have a diameter of 0.4-0.5mm and a length of 25mm. The shape and cross-section of the steel fiber are crescent-shaped. The amount of steel fiber added to the castable is 1-5% (by weight), and the length and amount of steel fiber should be appropriate. Generally, water is added to the mixture first, and then steel fiber is added for full stirring. It not only makes the mixture evenly stirred, but also saves 1/3 of the stirring time compared with stirring in the dry material where the...
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