Classification of Unshaped Refractories

Classification of Unshaped Refractories

According to the construction method and the nature of the material, unshaped refractory material can be divided into watering material, plastic, ramming material, spraying materials, casting materials and coatings.

Pouring material

A material with good flowability after stirring with water. After molding to be properly maintained, so that condensation, hardening, according to a certain system can be used after baking. Pouring materials to aluminum silicate clinker, corundum material or alkaline refractory clinker as aggregate; light cast material to expand perlite, vermiculite, ceramsite, alumina hollow ball for the aggregate. Binder with calcium aluminate cement, water glass, ethyl silicate, poly aluminum chloride, clay or phosphate. Adhesives depending on the use of the situation, its role is to improve the construction performance and improve physical and chemical properties.

Casting material construction molding methods are vibration method, pump injection method, pressure injection method, spray method and so on. With the pouring material for the overall lining, often with metal or ceramic anchor with the use. Such as adding stainless steel fiber reinforced, 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 baking furnaces, catalytic cracking furnaces, reformers, etc., and also for lining of smelting furnaces and high temperature melt channels, such as lead and zinc melting furnaces, tin tanks, Furnace, tapping or trough, Sheng steel drum, molten steel vacuum degassing device nozzle and so on.

Can be plastic

Plastic or mud with plasticity. When the appropriate external force is applied, it is easy to deform and not crack; after the stress is removed, it is no longer deformed. Plastic material can be semi-siliceous, clay, high aluminum, zircon stone, carbon, etc., but also lightweight plastic. Plastic can be added to plastic materials, plastic materials are mostly high-plastic clay, plasticizers can also be used to improve the plasticity of this clay. Plasticizers are carboxymethylcellulose, dextrin, lignosulfonate and the like. The plastic used in the bonding agent are plastic clay, phosphoric acid, aluminum dihydrogen phosphate, aluminum sulfate and so on. Add phosphoric acid or phosphate binder plastic oxide, the preservation process will react with the alumina chemical reaction, the formation of insoluble aluminum orthophosphate and mud hardening, so add preservatives such as oxalic acid, citric acid, acetyl Acetone and so on.

Construction methods generally use ramming or vibration method. When building a monolithic lining with plastic, you must configure a metal or ceramic anchor. The plastic can be used as the lining of the thermal equipment such as the soaking furnace, the heating furnace, the boiler and so on. It is also used for wrapping the heating pipe of the heating furnace.