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What is an amorphous refractory?

Release time:
2016/09/23 15:56
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What are the classifications of amorphous refractories?
According to the construction method and material properties, the amorphous refractory materials can be divided into pouring materials, plastics
What are the classifications of amorphous refractories?
According to the construction method and material properties, the amorphous refractory materials can be divided into pouring materials, plastics, ramming materials, spray materials, projection materials and coatings.
Watering material
A material with good fluidity after mixing with water. After molding, it needs to be properly cured to make it condense and harden. It can be used after baking according to a certain system. The pouring material is made of aluminum silicate clinker, corundum material or alkaline refractory clinker; the lightweight pouring material is made of expanded perlite, vermiculite, ceramsite and alumina hollow sphere. The binder is calcium aluminate cement, water glass, ethyl silicate, polyaluminum chloride, clay or phosphate. Admixtures are used depending on the application, and their function is to improve the construction performance and improve the physical and chemical properties.
The construction molding method of the pouring material includes a vibration method, a pump injection method, a pressure injection method, a spray method, and the like. The lining of the pouring material is often used in conjunction with metal or ceramic anchors. If added with stainless steel fiber reinforcement, it can improve its resistance to mechanical vibration and thermal shock resistance. The pouring material is used as a lining for various heat treatment furnaces, ore roasters, catalytic cracking furnaces, reforming furnaces, etc., and also used as a lining of a melting furnace and a high-temperature melt launder, such as a lead-zinc melting furnace, a tin bath, a salt bath. Furnace, tapping or tapping trough, steel drum, molten steel vacuum circulation degassing device nozzle, etc.
A plastic or mud with plasticity. When a suitable external force is applied, it is easily deformed without cracking; after the stress is removed, it is no longer deformed. The plastic material is semi-silica, clay, high-aluminum, zircon, carbon, etc., but also lightweight plastic. Plastics must be added to the plasticized material. Most of the plasticized materials are highly plastic clays. Plasticizers can also be used to improve the plasticity of the clay. The plasticizers are carboxymethyl cellulose, dextrin, lignosulfonate and the like. The binders used in the plastics are plastic clay, phosphoric acid, aluminum dihydrogen phosphate, aluminum sulfate, and the like. Alumina-based plastics with phosphoric acid or phosphate binder, chemically react with alumina during storage to form insoluble aluminum orthophosphate to harden the mud, so add preservatives such as oxalic acid, citric acid, and acetyl Acetone and the like.
The construction method generally uses the beating method or the vibration method. Metal or ceramic anchors must be used when building a complete lining with plastic. The plastic can be used as a lining for thermal equipment such as a soaking furnace, a heating furnace, a boiler, and the like, and is also used for wrapping a water-cooling tube of a heating furnace.
Spray feed
A refractory mixture for spraying or spraying with a jet. According to the spray method, it can be divided into wet spray (or mud spray), semi-dry spray and fire (flame) spray. Wet spray can spray high-level fog by using compressed air to spray slurry containing 20-40% refractory powder. The adhesion rate is high and uniform thin layer spray can be performed. Semi-dry spray is to add water to the nozzle to wet the refractory powder sprayed by compressed air. The added water is 11~14%, the adhesion rate is low, and the thick layer can be sprayed. The fire method is a dry spray, and the spray material is sent to the flame of the fuel-oxygen spray gun, and the spray material is partially melted in the nozzle flame to adhere to the brick lining.
The material of the spray material is aluminum silicon, aluminum silicon zirconium, magnesium, magnesium calcium, magnesium chromium and the like. The binder used is sodium silicate, phosphate, polyphosphate, pitch, resin, and the like. In order to increase the adhesion rate, an additive such as clay, bismuth (swell), lime, or the like is added. In order to ensure that the spray material can achieve good sintering, a sintering aid such as serpentine, pure olivine, lime, refractory clay, iron oxide or the like is also added.
Refractory coating
A material applied to a refractory brick lining. Refractory coatings are formulated in the form of mud and mud depending on the application requirements and construction methods. The binder used varies depending on the material, such as alkaline coating phosphate for the continuous casting tundish, polyphosphate, magnesium sulfate; clay for high alumina coating, aluminum dihydrogen phosphate, aluminum chromium phosphate, water glass, etc. . In order to improve the spreadability of the paint, an additive such as a plasticizer is generally added. The coating is mainly used as a protective coating for the lining of various thermal equipment, or for repairing local damage to the brick lining.
A bulk refractory material that has very low or no plasticity. The material is siliceous, clay, high alumina, corundum, zircon, silicon carbide, carbon, magnesium and so on. Depending on the material and conditions of use of the ramming material, inorganic binders or organic binders similar to the potting materials may be used, such as water-soluble dextrin, carboxymethyl cellulose, lignin, sulfonate, polyvinyl alcohol; Paraffin wax, asphalt, tar, phenolic resin, atactic polypropylene, etc. having thermoplasticity.
The ramming material is forced to be beaten, the porosity is low, and the density is high. Therefore, in the unshaped refractory material, the ramming material is particularly suitable as a lining for various containers of the smelting furnace lining and the high temperature molten metal. Such as open hearth and electric furnace hearth, various induction furnace lining, blast furnace tapping ditch, Shenggang barrel and so on.
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