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Special refractory bricks among amorphous refractory materials are a mixture of aggregates, powders, binders, or other additives in a certain proportion, which can be used directly or mixed with appropriate liquids. In other words, the refractory material is a new type of refractory material that does not undergo calcination, and its refractory resistance is not less than 1580°C. There are many types of unshaped refractory materials, which can be divided into concrete, castables, plastics, ramming materials, gunning materials, projection materials, smear materials, dry ramming materials, and refractory clay materials according to their production methods and usage methods. Various furnace repair materials (asphalt and large surface repair materials, Martin sand, etc.) are also unshaped. Although there are many types of uncertain product names, their typical production methods mainly include the following three forms: 1. Concrete: Concrete technology appeared earlier and is a final product among undefined products. Some parts of the heating kiln, such as the soaking furnace, heating furnace roof and walls, front and rear mouth rings of the rotary kiln, lower material slope, discharge chamber wall, etc., are designed as large masonry (the heating furnace top block weighs 3-4 tons ) to make concrete. The specific production method is...
Refractory bricks are an indispensable material for industrial furnaces and kiln construction. Before laying refractory bricks, the mortar to be used should be prepared. The maximum particle size of the grout should not exceed 20% of the masonry joints. The mud’s physical and chemical properties should match the refractory bricks’ variety and quality. When purchasing refractory bricks, it is best to specify the manufacturer to prepare the corresponding refractory slurry to prevent mixing. 1. Refractory mud preparation procedures The general requirements for the preparation of refractory slurry should be based on the type of masonry, and the consistency and liquid content of the slurry should be determined based on tests. At the same time, check whether the slurry’s masonry properties (bonding time) meet the masonry requirements. The bonding time of the slurry depends on the material and size of the refractory product, and generally should not exceed 2 minutes. The number and consistency of different slurries are selected according to the type of masonry. The determination of mud consistency should be carried out by the requirements of the current national industry standard “Refractory Mud Consistency Test Method”. The slurry bonding time is measured according to the requirements of the current...
The production process of refractory castables is the key to its quality. The crushing, proportioning, and stirring of raw materials are all factors that affect the quality of refractory castables. Therefore, improving the production process is the key to improving its quality. Today I will give you a simple introduction Learn about the production process of refractory castables. 1. Crushing and crushing: A jaw crusher is used for the coarse crushing of raw materials, mainly for the coarse crushing of large materials. Equipment for medium and fine crushing of refractory raw materials includes cone crushers, drum crushers, and dry crushers. 2. Screening and fine grinding: Screen the crushed materials according to particle size. The equipment includes a fixed inclined screen and an electromagnetic vibrating screen. Manufacture of refractory powders, including ball mills, tube mills, and vibration mills. 3. Premixing: Premix admixtures, admixtures, adhesives, fine powders, and other powders. The equipment is a double-spiral conical mixer, etc. 4. Ingredients scale: Electronic weighing is generally used to ensure the accuracy of weighing. 5. Mixing: Use a forced mixer to stir the material. The mixed material can be input into the packaging machine and then packaged, or it can be directly packaged into...
According to the classification of chemical properties, it can be divided into acid refractory materials, alkaline refractory materials, and neutral refractory materials. According to the main mineral chemical composition of refractory materials, it can be divided into siliceous refractory materials, aluminosilicate refractory materials, magnesia refractory materials, magnesium spinel refractory materials, magnesium chromium refractory materials, magnesium dolomite refractory materials, and dolomite refractory materials. Materials, carbon composite refractory materials, high aluminum refractory materials, chromium refractory materials, zirconia refractory materials, etc. According to the type of supply, it can be divided into two types: fixed refractory materials and unshaped refractory materials. According to the different classifications of refractory materials, they can be divided into ordinary/high-grade/special grade/super refractory materials. Those that can withstand temperatures of 1580~1770℃ are called ordinary refractory materials. Those that can withstand high temperatures of 1770~2000℃ are called advanced refractory materials. Those that can withstand temperatures of 2000~3000℃ are called advanced refractory materials. The temperature above 3000℃ is called super refractory material, and the temperature above 3000℃ is called super refractory material. According to the classification of bulk density, it can also be divided into light/heavy refractory materials. According to different performances and sizes, it can be divided into standard type/ordinary...
The important working properties of high alumina bricks are load temperature and high-temperature creep. The load softening temperature increases with the increase of product AL2O3 content. The content of AL2O3-high alumina bricks is below 70%. The load softening temperature depends on the mullite crystal and liquid phase ratio. The content of AL2O3 mullite-corundum products is between 70% and 90%. As AL2O3 increases, the load softening temperature does not increase significantly. This is because the Fe2O3 and TiO2 components in the raw material increase slightly with the increase of AL2O3, and the quantity and properties of the high-temperature liquid phase change accordingly. The mullite crystal phase partially softens at high temperatures. Although the amount of corundum has increased, the skeleton cannot be formed, resulting in no significant increase in the load-softening temperature. Only when the AL2O3 content in the product exceeds 90% or even exceeds 95%, the main crystal phase in the product is corundum, and the direct bonding rate between crystal grains is significantly improved. The liquid phase only exists in the gaps between crystal grains, and its load-softening temperature is significantly increased. The creep rate is used to express the high-temperature creep rate of high alumina bricks. For example, the...
Dolomite is the main raw material for the production of magnesia-calcium refractory materials. The main component is magnesium calcium carbonate. The chemical composition is CaMg(CO3)2. The theoretical chemical composition is CaO 30.4%, MgO 21.7%, and CO2 47.9%. The composition is Mg can be replaced by Fe, Mn, Co, Zn, CA can be replaced by Pb, Na when the number of iron or manganese atoms exceeds Mg, it is called ankerite or manganese dolomite. After dolomite is heated, MgCO3 decomposes at around 750°C and CaCO3 decomposes at around 950°C. Dolomite is a cubic mineral with a relative density of 2.8 to 2.9 and a Mohs hardness of 3.5 to 4.5. Dolomite is widely used in metallurgy, refractory materials, building materials, ceramics, glass, the chemical industry, agriculture and forestry, environmental protection and energy saving, and other fields. It is a non-metallic mineral resource that can be exploited in a variety of ways. With the development of modern science and technology, the development and application of dolomite has penetrated various fields of social development and has become a mineral resource with huge economic value. Dolomite is one of the important raw materials for alkaline refractory materials. It is mainly used for lining the...
Refractory castable is an amorphous refractory material, which will be the development trend of refractory materials in the future. Because it does not require firing, is environmentally friendly, has simple construction, saves manpower, and is widely used, it is favored by customers. The refractory cement in the refractory castable material is the main factor that determines the initial strength of the castable material, but do not think that the greater the proportion of refractory cement, the better the strength! Introduction to refractory castable strength-hardening properties Refractory cement, also known as aluminate cement, is mixed with refractory aggregate, powder, and water. Under the action of the cementing agent, as long as it meets its specific requirements, it can achieve chemical or physical bonding to achieve the hardening of refractory materials with high strength. This process is called hardening. There are three types of hardening, which are introduced in detail below. 1. Water glass is a gas-hardening bonding agent. Its hardening strength requires a dry air environment, but its fire resistance and load softening point are low. It is suitable for parts with high strength, good wear resistance and good acid resistance below 1000℃, but it cannot be used for parts that...
We all know that refractory castable material is used to build high-temperature kiln linings, but many people want to know how to produce refractory castable material. Today, the editor will take you to understand the production process of refractory castable materials. 1. Crushing and crushing: A jaw crusher is used for the coarse crushing of raw materials, mainly for the coarse crushing of large pieces of materials. Medium and fine crushing equipment for refractory raw materials includes cone crushers, drum crushers, and dry crushers. 2. Screening and fine grinding: Screen the crushed materials according to particle size. The equipment includes a fixed inclined screen and an electromagnetic vibrating screen. Manufacture of refractory powders, including ball mills, tube mills, and vibration mills. 3. Pre-mixing: Pre-mix admixtures, admixtures, binders, fine powders, and other powders. The equipment is a double-spiral conical mixer, etc. 4. Ingredients scale: Electronic weighing is generally used to ensure the accuracy of weighing. 5. Mixing: Use a forced mixer to stir the material. The mixed material can be input into the packaging machine and then packaged, or it can be packaged into bags directly from the outlet of the mixer. 6. Distribution and sealing: Use dispensing equipment for dispensing,...
The composition of refractory bricks is mainly mixed powdery particles composed of a variety of aggregates or aggregates and one or more binders. When used, they must be mixed evenly with one or more liquids and have a strong flow. sex. Different refractory bricks have different raw materials, such as silicon alumina, clay, etc.: According to the different compositions of refractory bricks, they can be divided into five categories, namely: silicon-alumina series refractory bricks, alkaline series refractory bricks, carbon-containing refractory bricks, zirconium-containing refractory bricks, and insulating refractory bricks. Any stove is not built with only one kind of refractory bricks but requires the use of different refractory bricks in conjunction with each other. The following is a detailed introduction to the components of these five categories of refractory bricks. 1. Silicon-aluminum refractory bricks, it is reported, are based on the AL2O3-SiO2 binary system phase diagram as the basic theory, and mainly include the following types. Silica brick refers to refractory bricks containing more than 93% SiO2 and is the main variety of acid refractory bricks. It is mainly used for building coke ovens and is also used in the vaults and other load-bearing parts of thermal kilns of various glass,...
Refractory castables have strong fluidity and plasticity. It is one of the most widely produced and used amorphous refractory materials. Mainly used to build various heating furnace linings and other overall structures. Refractory castables have high room temperature strength and are used to make prefabricated components and install them on-site in rotary kilns. So what preparations should we make before construction? 1. Determine the shape and structure of the castable facility and clean it. 2. Process channel settings. 3. Construction machinery, vibration tools, etc. must be in good condition and have complete parts. 4. Anchor type, proportion, location, and cold welding quality. Metal anchors must be expansion compensated. 5. Preventive measures should be taken to prevent dehydration (glue) of castables in the surrounding refractory brick insulation layer. 6. The packaging and delivery date of the castable, and conduct a pre-test to check whether it is invalid. 7. The quality of construction water must reach drinking water quality. 8. Implementation of construction technical inspection. 9. Pouring procedure. Through the above inspection, to facilitate our subsequent construction, if any parts are unqualified, they will be replaced in time to avoid problems during the construction process.
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