Refractory cement castables have a simple production process, labor-saving and energy-saving, high construction rate, good quality, and can be prepared on-site according to the need or choose materials with excellent performance.Fireramo has organized the purchase of refractory castables for you from many aspects, from the perspective of application scenarios, economic conditions, and environmental protection performance to choose the refractory castable that is suitable for your project.
Refractory castable is a kind of building refractory material widely used in high temperature industrial fields, such as steelmaking, ceramics, glass and other industries. It is made of a mixture of raw materials such as refractory aggregate, powder and binding agent. Refractory castable material is a kind of unshaped refractory material with large dosage and wide range of application in furnace construction project.
Refractory castables, when used, should take into account the high and low furnace temperatures, changes in the situation, the nature of the slag, the furnace charge furnace building, molten metal and other mechanical friction and scouring. Although there is a wide variety of castables, there is no single castable that can meet the working requirements of all high temperature furnaces. It is necessary to analyze the causes of damage to the lining to meet the main conditions of the main. Such as for the heating furnace roof, to meet the high-temperature structure of high strength, resistance to scouring, other are secondary; such as in the blast furnace iron out of the ditch slag line parts, to meet the slag resistance requirements; for frequent temperature changes or intermittent operation of the furnace, to meet the thermal shock resistance; in the bottom of the aluminum melting furnace with a refractory castable to choose a high-strength anti-penetration requirements, and so on. In short, the use of refractory castables for each part of the furnace is not the same, and suitable castables should be selected according to the working conditions of each part.
According to the high temperature of the furnace, wear-resistant requirements, chemical properties, etc., you can choose the appropriate wear-resistant, refractory castables, acidic choice of silica products, neutral choice of high alumina or corundum products, alkaline choice of magnesium products; 1000 degrees or so you can choose the clay products; 1200-1400 degrees or so you can choose the high alumina products, 1600-1700 degrees or so you can choose the corundum products and so on. The product can be chosen from the corundum products at about 1600-1700 degrees, and so on.
In order to meet the working requirements of each part of the high temperature furnace, but also consider the economic conditions of the castables, such as the use of temperature in 1000 ℃ of the castables can meet the technical needs of the castables do not go to choose the use of temperature in 1200 ℃ of the castables, refractory castable prices according to the indicators or the use of different temperatures, the price difference is large. Especially for the use of easy to wear parts, to choose a low price, sufficient supply of castables. There is no need to choose high-quality, high-priced materials, to consider the problem from the economy and service life.
Modern industry is paying more and more attention to environmental protection and energy saving. When purchasing refractory castables, you need to consider whether it will produce harmful substances in the process of use, whether it meets environmental standards and other factors.
The use of unshaped refractory materials, such as high-temperature cement, refractory plastic, refractory castables, etc., must be checked before use. More than the specified period of materials, the use of performance will decline. When unpacking the pocket of refractory castables, we must check the date of leaving the factory on the bag carefully. If the preservation period of alumina cement is 3~6 months, the cement is easily affected by air humidity and caking and deterioration during storage and transportation, so it must be checked strictly. The soft billet of refractory plastisol can not be used after it becomes hard due to drying and solidifying.
Refractory castable material particle size, particle size and shape of the product, the strength of the size and composition, the quality of masonry has a very important impact. Check the shape of the particle size, the general use of visual methods. Such as knotted induction furnace stack boiler lining particle size is prismatic, with sharp corners. Check the strength of the particle size can be struck with a wooden hammer to see how it crushed to determine the situation.
Check the size of the particle size and its composition, the sieving method. The sieving method is carried out in a test chamber, which measures the percent composition of various particle sizes. When checking, firstly, according to the technical requirements on the furnace drawing, pay attention to the limit size of the large particle size, and secondly, pay attention to the refractory cement not to lose too much fine powder part, so as not to reduce its masonry performance.
According to the environment of the equipment to choose the nature of the product, such as alkaline choice of magnesium materials, acidic choice of silica materials, neutral choice of high alumina castable or corundum refractory castables;
According to the use of temperature, about 1000 degrees without wear-resistant parts can choose the cheaper clay products, 1400 degrees can choose high aluminum products, 1700 degrees can choose corundum products, 2000 degrees or so, we have to choose special material refractory castables;
Wear-resistant parts of the choice of wear-resistant products, such as corundum castables, high-alumina high-strength wear-resistant, corundum silicon carbide, steel fiber wear-resistant refractory castables;
Choose acid-resistant or lightweight heat insulation castables for chimney parts;
Unimportant parts can be used for ordinary refractory castables.
In addition, refractory castables in the use of the furnace temperature, taking into account the high and low, changes in the situation, the nature of the slag, furnace slag, molten metal and other mechanical friction and scouring. Although there are many kinds, but to be used in combination to meet the high temperature furnace parts of the operational requirements. In order to meet the use of high temperature furnace parts at the same time, but also consider the economy, such as the use of temperature at 1400 ℃ of the castables can meet the technical requirements do not go to the choice of using the temperature at 1500 ℃ of the product, refractory castable prices are based on the indicators, the same product indicators of the different prices are not the same.
Users use unshaped refractory material, such as refractory castables, plastic, etc., first check its use of the expiration date. Because the shelf life of refractory castables is about 3-6 months, improper storage is easy to make the castables and bonding agent agglomeration, affecting the use of performance, so the product quality must be checked before use. After opening the product package, we must check the date of leaving the factory on the package carefully, and the performance of refractory castable will be reduced if the product exceeds the specified period.
The working layer of refractory materials need regular inspection and maintenance, in the choice of refractory castables is to be extra careful, different parts of the use of different castables, to meet the main causes of damage to the main. Thermal insulation layer is thermal insulation castables or thermal insulation refractory turn, aluminum silicate fiber blanket, etc., mainly thermal insulation, reduce energy consumption; permanent layer is to protect the thermal insulation layer of materials, the use of performance than the working layer of materials, slightly worse, when the working layer of materials wear, there are permanent layer of materials to resist high temperatures, to protect the thermal insulation layer of materials and the furnace shell. The working layer is mainly in contact with all kinds of high temperature liquid, slag, material parts, but also the main damaged parts, usually maintenance lining is mainly on the working layer of material repair to extend the service life of the lining.
Refractory castables in the use of high temperature by a variety of high-temperature force, the nature of the slag, a variety of solids, dust air friction, chemical erosion and other factors, according to the working environment to choose the right refractory castables.
High-temperature working environment is complex and changeable, there are frequent temperature changes, high temperature section, low temperature section, there are furnace charge scouring, a variety of chemical erosion, etc., due to the different nature of the chemical erosion, mainly divided into the acidic atmosphere, acidic and alkaline atmosphere and alkaline atmosphere, the refractory castables used are different, acidic erosion of the parts of the serious use of silica refractory castables; acid and alkaline erosion of the choice of high-alumina or corundum refractory castables; alkaline erosion of the choice of magnesium refractory castables. Choose magnesium refractory castables for acidic and alkaline erosion, and magnesium refractory castables for alkaline erosion.
Determine the material and performance of refractory castables, but also to make a choice on its price, to high-quality low price, long service life as the standard, as long as it can meet the needs of the working conditions, do not have to high-grade or low-grade castables; choose sufficient supplies of stable price of the castables, do not choose scarce or raw material prices fluctuating large castables; must be in the pouring material manufacturers enough to buy, do not buy materials in the hands of intermediary, an additional increase in the Costs.
Fireramo, as a leader of refractory materials in China, we provide you with high quality refractory castables. At the same time, we support customized refractory castables for you and sell them to all over the world at factory price. If you still have questions about purchasing refractory castables or have the need to buy refractory castables, please contact us.
Specializing in refractory materials for over 20 years, we provide professional refractory solutions for the global high temperature industry.