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The raw materials of refractory castables are divided into refractory aggregates, refractory powders, adhesives and additives. Raw materials with different properties can be prepared into amorphous refractories with different properties, operating temperatures and application ranges.
Modern amorphous refractory castables usually use composite raw materials to give full play to their respective characteristics, so as to obtain good physical and chemical properties and improve the service life of furnaces and thermal equipment. Therefore, in order to reasonably select raw materials, it is necessary to understand the properties and technical requirements of various raw materials.
Inorganic adhesives can be further divided into cement and other types of adhesives. Cement includes Portland cement, aluminate cement and periclase cement. The strength of amorphous refractories mainly comes from the hydration of cement. Other types are sodium silicate, phosphoric acid, sulfate phosphate and soft. Clay and ultra-fine powder mainly cause the strength of amorphous refractory castables through their chemical, polymerization and agglomeration effects.
Organic adhesives mainly include sulfite pulp waste liquid, dextrin, starch, methylcellulose, ethyl silicate asphalt and phenolic resin, and through its new combination, polymerization or condensation carbonization is mainly fire-resistant. Castables have strength.
Adhesives are materials that bond refractory aggregates and powders to give strength to amorphous pre fired materials. Cementing methods are divided into hydration bonding, chemical bonding, polymerization bonding and agglomeration bonding, or a combination of several combinations. Binder is an important component of amorphous refractory castables. Its types are divided into inorganic binder, organic binder and very common inorganic binder.